BRPI0800237B1 - processes for reducing corrosion in a corrosion-susceptible internal combustion engine and for improving the durability of said engine, and composition for reducing corrosion in said engine - Google Patents

Abstract

processes and compositions for reducing corrosion and increasing the durability of engines using alcohol as a fuel. The present invention relates to compositions and processes for reducing corrosion and improving durability in engines that burn an ethanol-containing fuel and a corrosion inhibitor. The present disclosure also provides compositions and processes for reducing corrosion and improving durability in engines that burn an ethanol-containing fuel, a corrosion inhibitor and a dispersant.

Description

(54) Title: PROCESSES FOR REDUCING CORROSION IN AN INTERNAL COMBUSTION ENGINE SUSTAINABLE FROM CORROSION AND TO IMPROVE THE DURABILITY OF THAT ENGINE, AND COMPOSITION TO REDUCE CORROSION IN THAT ENGINE (51) Int.CI .: C10L 10/04 ; C10L 1/222 (30) Unionist Priority: 03/08/2007 US 11 / 683,732 (73) Holder (s): AFTON CHEMICAL CORPORATION (72) Inventor (s): RICHARD J. DUMONT; GREGORY H. GUINTHER

Invention Patent Descriptive Report for

PROCESSES TO REDUCE CORROSION IN AN INTERNAL COMBUSTION ENGINE SUSTAINABLE FROM CORROSION AND TO IMPROVE THE DURABILITY OF THAT ENGINE, AND

COMPOSITION TO REDUCE CORROSION IN THAT ENGINE.

FIELD

The present invention relates to the use of a dispersing fuel additive in fuels containing an alcohol and a corrosion inhibitor. Dispersant fuel additives improve the properties of the resulting fuel and also improve the benefits for the consumer and the environment of using varying amounts of ethanol as a fuel in combustion engines. In addition, the present description relates to the use of a corrosion inhibitor dodecenyl succinic acid (DDSA) in fuels containing an alcohol. In particular, the present description provides compositions and processes for reducing corrosion and increasing the durability of engines that burn a fuel that contains an alcohol, such as ethanol.

FUNDAMENTALS

The use of ethanol alone or in gasoline mixtures can create new problems for the control of fuel and of computer mechanisms for injection designed to handle the non-polar hydrocarbon fractions of petroleum commonly known as gasolines. The polarity, corrosivity, adhesiveness, frictional properties and perhaps the conductivity of ethanol or fuel containing ethanol can create new problems and new needs in the fuel industry.

A common mix of gasoline and ethanol being discussed is 15% gasoline and 85% ethanol, often called E85 fuel (hereinafter E85). Other ethanol fuels can

Petition 870170066742, of 9/8/2017, p. 7/15 comprise, for example, 10% ethanol (E10) and 100% ethanol (E100).

Commercial ethanol is widely treated with additives designed to prevent human consumption. Such treated ethanol is called denatured alcohol (or denatured ethanol) and common denaturants include gasoline, gasoline components and kerosene. Other denaturants to make alcohol fuel unsuitable for use as a drink are defined in 27 CFR 21.24.

The use of varying degrees of ethanol in gasoline fuels can create problems, for example, with increased deposits in the engine, fuel stability, corrosion, fuel economy, driveability, light, demulsifiability, ignition, antioxidant, oil change interval , CARB standards range, 'Top-Tier auto-makei ⁴ ' standards range, US EPA standards range, solubility, component compatibility, fuel line clogging, engine durability, engine wear and injector dirt, which will benefit from the inclusion of certain fuel additives in the fuel.

Work by car manufacturers and others has indicated that low pH ethanol (both in the E-85 and E-10 blends) can contribute to the accelerated corrosion of certain components of the fuel system. While ASTM Standard D 6423 currently limits total acidity as acetic acid to 0.007 weight percent (56 mg / L), this standard is not always sufficient to limit the most aggressive sulfuric acids. Ethanol that meets the ASTM acidity standard can still be of low pH. This accelerated preparation corrosion gave rise to the use of corrosion inhibitors to buffer ethanol and protect the metal components of the fuel distribution system: however, these can cause the formation of undesirable deposits in the engine. Therefore, a buffering agent is often desired.

DCI-11 is a corrosion inhibitor and commercially available buffer marketed by Innospec (formerly Associated Octel) and used in fuels. However, corrosion problems still arise in the engine due to the combustion of fuels containing ethanol containing this and other corrosion inhibitors. This corrosion can also lead to problems with the engine's durability.

There is therefore a need for a solution to the engine corrosion problem of engines that burn ethanol-containing fuels that have corrosion inhibitors or rosin-inhibiting gasoline-ethanol mixtures. There is also a need to maintain DCI-11 to buffer acidic species such as acetic acid and / or sulfuric acid, among others, present in fuels that contain ethanol, but that prevent corrosion of the engine.

SUMMARY OF MODALITIES

One modality presented in this case provides additive agents for fuels for use in reducing or inhibiting corrosion in engines (or engine components) that burn fuels that contain ethanol, which include, but are not limited to E100, E85, E50 and the like until E10 and ethanol blend routes in gasoline.

Another modality presented in this case provides a fuel additive agent for use in reducing or inhibiting corrosion in engines (or engine components) that burn a corrosion inhibitor and fuels that contain ethanol, including, but not limited to

E100, E85, E50 and similar to E10 and traces of ethanol blends in gasoline. Fuel additives include succinimide dispersants, succinamide dispersants, amides, Mannich-based dispersants, polyalkylene amine dispersants and polyisobutylene amine dispersants.

In another embodiment, it was observed that dispersants or mixtures thereof are very effective in improving the durability of the engine ₍ engine burning an ethanol-containing fuel that also contains combinations of at least one organic acid and at least one amine or salts thereof as corrosion inhibitors.

In one embodiment in this case, the ethanol content of the fuel composition is from approximately 74 to approximately 85%. In another embodiment, the fuel is 100% ethanol and in yet another embodiment the ethanol content of the fuel composition is approximately 50% or is approximately 50% to approximately 74%.

Another embodiment provides a process for improving corrosion resistance and / or for reducing the corrosion of an internal combustion engine, said process comprising burning in said engine a fuel composition comprising gasoline, ethanol and at least one fuel dispersing additive. . The dispersing fuel additives used in this case are effective in preventing or minimizing corrosion of metal surfaces and certain plastic or synthetic parts or surfaces in combustion engines that come in contact with fuel containing ethanol and a corrosion inhibitor. Parts such as fuel pumps, valves, gaskets, buoys, relays or signaling devices, gauges, screens, filters, intake valves, pistons, engine bearings, ferrous metal parts and others can all experience some degree of corrosion. Corrosion can vary depending on the type and duration of exposure, the chemical nature of the exposed surface and the concentration of ethanol and corrosion inhibitor in the fuel and the concentration of the fuel and corrosion inhibitor in the engine oil. By the present description, a fuel additive package or concentrate for fuel containing ethanol can be designed to reduce corrosion in these engines. The fuel additive concentrate in this case may contain one or more corrosion inhibitors, a dispersant and a diluent which may be an oil, fuel, gasoline, ethanol, solvent, fluid vehicle or other combustible material in an engine

,. powered by gasoline fuel.

In one embodiment, a fuel additive concentrate comprising ethanol and a dispersant is provided for use. in a gasoline that contains a corrosion inhibitor as defining in this case, which includes, but is not limited to those materials that have a product that results from the combination of an acid or an organic diacid and an amine, diamine or polyamine.

Consequently, in another example in this case a composition is provided to reduce corrosion and / or improve the durability of an internal combustion engine that burns a fuel containing ethanol, said composition comprising gasoline, ethanol and one or more materials selected from the group consisting of succinimide dispersants, succinamide dispersants, Mannich-based dispersing amides, polyalkylene amine dispersants and polyisobutylene amine dispersants.

In another embodiment, a process for reducing corrosion and / or improving the durability of an internal combustion engine that burns a fuel composition containing alcohol may comprise burning the fuel with a dodecenyl succinic acid (DDSA) corrosion inhibitor and burning the fuel and the DDSA corrosion inhibitor in the engine. Corrosion can be reduced in relation to the corrosion that occurs when burning the fuel composition containing alcohol with a corrosion inhibitor substantially free from a DDSA corrosion inhibitor.

In another embodiment, a composition for reducing corrosion and / or for improving the durability of an internal combustion engine that burns an alcohol-containing fuel can comprise a DDSA corrosion inhibitor and an alcohol.

It should be understood that both the previous general description and the following detailed description are examples and explanatory only and are intended to provide additional explanation of the present description, as vindicated king15.

DETAILED DESCRIPTION OF THE MODALITIES

Corrosion in this case means any degradation, rust formation, weakening, deterioration, softening and the like of the surface of an engine or an engine part or component due to exposure to or combustion of a fuel that _f has con- ethanol.

By PEA and polyetheramine in this case are meant organic compounds that have one or more amine nitrogen atoms and one or more ether bonds containing oxygen. Thus, the prefix poly- is not a limitation25 in this case, which requires two or more, but it is the common term of the technique and can, in one modality, include an organic compound that has an amine nitrogen and an ether bond containing oxygen if molecular weight and solubility reduce corrosion. The ether parts can be derived, for example, from ethylene oxide, propylene oxide, butylene oxide and mixtures thereof. In one particular embodiment, the PEA can be a diamine and / or it can have a molecular weight greater than 700. In another embodiment, the molecular weight of the polyetheramine can be from 700 to 3000 and particularly from 900 to 1500. More specifically , PEA's useful in the present description can also include carbamates, amino carbamates, mono- and dithiocarbamates, amino alkyls and starch alkanolamines, all known to those skilled in the art. A secret to performance in the present description is the need for solubility of detergent in fuel containing ethanol requires more polarity than present with conventional polyisobutylene (non-polar) detergents.

Corrosion inhibition or corrosion reduction in this case means any improvement in minimizing, reducing, eliminating or preventing

Ϊ0 of corrosion. Engine durability in this case means the accumulation of metals in the lubricating oil that indicates wear and / or adverse stress on the engine or moving parts of the engine. The improved engine durability allows for longer oil change intervals. The engine's durability is, therefore, a characteristic performance distinct from the corrosion inhibition15; are.

Ethanof in this case means ethyl alcohol, the chemical compound C2H ₅ OH. This can arise or be supplied in many qualities or

,. grades, such as commercial grade or fuel grade, as well as pure or reagent grade ethanol and can be derived from any source, but not limited to oil refinery products, distillation strips and bioderivatives (e.g. bioethanol from corn or other plantations). In some embodiments, ethanol can be present in an amount of from approximately 10 to approximately 100% by weight based on the total composition of the fuel. In another embodiment, ethanol can be present in an amount of from approximately 15 to approximately 85% by weight based on the total composition of the fuel. In yet another embodiment, ethanol can be present in an amount of from approximately 74 to approximately 85% by weight based on the total composition of the fuel.

New Energy ethanol in this case means the ethanol produced by or for a company known as New Energy and whose ethanol is known to have approximately 0.9 PTB or less of corrosion inhibitor

Innospec DCI-11.

ADM ethanol · 'in this case means ethanol produced by or for Archer Daniels Midland Corporation and which is known to have approximately 32 PTB of Innospec DCI-11 corrosion inhibitor.

Corrosion inhibitor in this case means at least the following amines (mono-, di-, tri and poly) amines of low molecular weight (ie <700), etherins, imines, imidazolines, thiadiazoles, monocarboxylic acids, acids dicarboxylics, p-phenylenediamine and dicyclohexylamine, substituted alkyl succinic acids and anhydrides and mixtures thereof and salts thereof. The corrosion inhibitors useful in this case may also include or comprise tetrapropenylsuccinic acid or anhydride and polymers thereof and dodecenyl succinic acid or anhydride (DDSA) and polymers thereof. These may include commercial products, for example, those known as Petrolite Tolad 3222 and Petrolite Tolad 3224 which are believed to generally have an NH ₂ (CH ₂ ) _n -NH- (CH ₂ ) mO-C8-io structure in which nor are they independently 1 to approximately 10. Also included in this case as a corrosion inhibitor is the product DCI-11®, from Innospec (formerly Associated Octel) which is believed to contain the product of the reaction of an organic acid and an amine or an diamine, such as Duomine® which has the structure NH ₂ (CH ₂ ) n-NH-Ce-io, where n is 1 to approximately 10. The DCI-11 product is believed to be the amine salt of low molecular weight (<500) of a carboxylic acid. Another suitable corrosion inhibitor is dodecenyl succinic acid (DDSA), commercially available from Afton Chemical Corporation as a HiTEC® 6455 Fuel Additive.

By dispersant, dispersing additive, or combustible dispersing additive in this case is meant a dispersant, an detergent dispersant or a dispersing composition containing two or more dispersants of the same or different type. Suitable dispersants include, but are not limited to, succinimide dispersants, succinamide dispersants, amides, Mannich-based dispersants, polyalkylene amine dispersants and polyisobutylene amine dispersants.

A fuel additive suitable for use in the compositions described herein can also comprise one or more of a phenolic; an impeded phenolic; a polyolefin amine; an aryl amine; a diphenyl amine; a monocarboxylic acid; a dicarboxylic acid; a polycarboxylic acid; an oxidized alkylphenolic resin; a formaldehyde polymer with 4- (1,1-dimethylethyl) phenol, a methyloxirane and oxirane; an octane improving material selected from the group consisting of tetraethyl lead, methylcyclopentadienyl manganese tricarbonyl, an azide, peroxide and alkyl nitrate; a monoester, a diester, an ether, a ketone; a diether; a polyether, a glyme; a glycol; an oxirane; an aliphatic CrC ₈ hydrocarbon; a butylene oxide; a propylene oxide; an ethylene oxide; an epoxide; a butane; a pentane; a xylene; a nitrous oxide; a nitromethane; a phenate; a salicylate; a sulfonate; a nonylphenol ethoxylate; a fuel-soluble alkaline detergent and a detergent that contains alkaline earth metal.

Petrolite Tolad 357 is a corrosion inhibitor useful in this case and believed to be a composition that has a molecular weight of approximately 700 or less that comprises (1) an acid or an alkenyl succinic anhydride (ASAA) and (2) the product of reaction of ASAA and a trialcanol

,. amine such as triethanolamine (TEA) in which the ASAA (3ols) is reacted with TEA (1 mol) to provide an amidan and / or an amine salt.

In another embodiment, the corrosion inhibitor is the product of

•. combination of an organic acid or a diacid and an amine, diamine or poliamiha in a ratio of approximately 5: 1.

In another embodiment in this case a fuel composition is provided which can be or can comprise, 1.0 to 100 percent volume of one or more alcohols and 0 to 99% gasoline and a corrosion inhibitor, said inhibitor comprising, in weight (a) approximately 35% to 70% of at least one mono- or dialkenyl succinic acid in which the alkenyl group has 8 to 18 carbons and (b) approximately 30% to 65% of an aliphatic or cycloaliphatic amine, diamine or polyamine , containing 2 to 12 carbon atoms. In one embodiment, the corrosion inhibitor can be dissolved in a hydrocarbon solvent consisting of an aromatic hydrocarbon, an alcohol containing 1 to 4 carbon atoms or a mixture thereof, the ratio of the hydrocarbon solvent to the total of (a) and ( b) being approximately 15:85 to 50:50, in which the corrosion inhibitor is present in the fuel composition at less than approximately 1000 ppm.

In another embodiment in this case the corrosion inhibitor can be or comprise a composition that has, by weight, (a) approximately 75% to 95% of at least one polymerized unsaturated aliphatic monocarboxylic acid, said unsaturated acid having 16 to 18 carbons per molecule and (b) approximately 5% to 25% of at least one monoalkenyl succinic acid in which the alkenyl group has 8 to 18 carbons.

Ϊ0 In another embodiment, the corrosion inhibitor may comprise a dodecenyl succinic acid (DDSA).

The corrosion inhibitor can be mixed with or with ethanol or gasoline or with a mixture of ethanol / gasoline

Corrosion inhibitors in this case may include, but are not βει 5 so limited to the following commercial products and derivatives thereof and chemically equivalent products:

Octel DCI-11 often used in fuel ethanol, for example, at approximately 20 PTB

Petrolite Tolad 3222 often used in fuel ethanol, for example, at approximately 20 PTB

Petrolite Tolad 3224 often used in fuel ethanol, for example, at approximately 13 PTB

Petrolite Tolad 357 often used in fuel ethanol, for example, at approximately 15 PTB

Nalco 5403 often used in fuel ethanol, for example, at approximately 30 PTB

ENDCOR FE-9730 (formerly Betz® ACN 13) often used in fuel ethanol, for example, at approximately 20 PTB

MidContinental MCC5011E often used in fuel ethanol 30, for example, at approximately 20 PTB

MidContinental MCC5011EW often used in fuel ethanol, for example, at approximately 27 PTB

CorrPro 654 often used in fuel ethanol, for example, at approximately 13 PTB

Afton Chemicaís HiTEC ® 6455, for example, at approximately 32 PTB

PTB in this case means pounds per thousand barrels, a common term of the technique in the fuel additives industry. A PTB is approximately equivalent to approximately 4 ppm.

Thus, in this case, a modality of a process is provided to reduce corrosion and / or improve the durability of the engine of an internal combustion engine, said process comprising combustion in said engine of a fuel composition comprising gasoline, alcohol , a corrosion inhibitor and at least one dispersing fuel additive, in which the corrosion of the engine is reduced and / or the durability of the engine is improved in relation to corrosion and / or the durability of the engine when combustion of a composition is used fuel containing alcohol that contains a corrosion inhibitor, but without at least one dispersing fuel additive. In one embodiment, in this case, alcohol is ethanol and in another it

,. is methanol, propanol, butanol and / or mixtures that comprise any combination thereof.

As a result of the better engine durability mentioned above,. the present description allows for longer oil drain intervals and longer mileage without oil change and / or engine damage, when the engine is using, for combustion, an alcohol-containing fuel composition containing a corrosion inhibitor. In this way, a process is provided to improve the lubricant oil drain interval in a vehicle lubricated with an oil when the vehicle's engine is using, for combustion, a fuel composition containing alcohol that contains a corrosion inhibitor.

It has also been discovered that excess acidic components, such as acetic acid and sulfuric acid species, contribute to wear and deposit build-up in engines and / or valves or other parts of the engine. The use of a dispersant in this case helps to increase the pH slightly by buffering the acetic and / or sulfuric acid components, thus reducing or preventing the formation of reaction products that contribute to the deposit. The use of dispersant in this case is also useful for buffering the acid corrosion inhibitor. Thus, the present description provides a corrosion inhibiting buffer in the form of a dispersant used in fuels containing ethanol.

A fuel is also provided in this case which comprises (a) an alcohol selected from the group consisting of methanol, ethanol, propanol and butanol and mixtures thereof, (b) gasoline, (c) the product of the combination of an organic carboxylic acid or diacid and an amine, diamine or polyamine and (d) a dispersant comprising one or more of a succinimide dispersant, a succinamide dispersant, an amide, a Mannich-based succinimide dispersant, a polyalkylene amine dispersant and a polyisobutylene dispersant of amine.

It has also been found that the use of a dodecenyl succinic acid (DDSA) corrosion inhibitor decreases corrosion and / or improves the durability of an internal combustion engine susceptible to corrosion and / or loss of durability. In one embodiment, DDSA is suitable for use in place of the conventional DC111 corrosion inhibitor. In addition, in another embodiment, the DDSA corrosion inhibitor can be used with or without a dispersing fuel additive.

The following examples also illustrate aspects of the present description but do not limit the present description.

EXAMPLES

Fuel samples, as defined in Table I below, were prepared and aged (or used) by burning them in a 2006 6-cylinder, 3.5 liter Chevrolet Impala Flexible Fuel Vehicle (FFV) that traveled approximately 8046 km ( 5000 miles). FFV refers to vehicles capable of operating in mixtures of up to

85% ethanol and 15% hydrocarbon such as unleaded gasoline. The test consisted of 100-minute multistage cycles consisting of a mixture of accelerations and regular running at 40.2 km / h, 64.4 km / h and

104.6 km / h (25 MPH, 40 MPH and 65 MPH). Original Equipment Manufacturers (OEM's) use the heavy duty maintenance table when using E85, which specifies oil changes around 5630 km (3500 miles). Thus, the present aging process is more rigorous than industry standards and the present modalities both satisfy and exceed the recommended service interval by more than approximately 40%.

The aged engine oils were then tested to determine the corrosion properties using the Rust Test with the ASTM D6557 ball, incorporated here as a reference. The results are given as Average Gray Value (Average Gray Value (AGV)). The API Classifications for engine oil for 2004 require that a new oil has a minimum AGV of 100. The International Lubricant Standardization and Approval Committee (ILSAC) GF-4 Standard for Passenger Car Engine Oils also requires that a new oil has a Minimum AGV of 100. The AGV results shown in Table I are based on aged (or used) oil samples. A greater result of

,. that 100 for a new oil is considered within the petroleum additive industry as an acceptable result. A result less than 100 for a new oil is an insufficient result. In the present examples, a, aged samples based on the modalities described here provide acceptable results based on API and ILSAC standards for new oils.

* Such exceptional results indicate a preservation of the oil's corrosion protection properties even after aging.

Each of the samples was also tested for iron concentration using standard analytical test procedures. This is shown in Table I. The iron content of the aged or used oil is an indication of rust or corrosion of the engine parts. A value less than 50 ppm is desirable; however, a value less than 30 ppm in a used oil is ideal.

Table 1 (*) Iron content after aging ppm

Results of the Ball Rust Test in Chevrolet Impala FFV that ran 8050 km (5000 miles). Examples Ethanol Source Ethanol, % RUL gasoline,% 11-6560, (*) H-6455, DDSA PTB DCI-11, PTB AGV (*) 1 THE 84 16 32 88 36 2 B 84 16 70 26 3 THE 84 16 85 32 115 21 4 B 84 16 32 124 18

(*) Mannich PTB dispersant

In the Table, the source of Ethanol A refers to Ethanol ADM Denatured which contains 4 ppm of sulfates and 32 PTB Innospec DCi-11 corrosion inhibitor. The 32 PTB Innospec DCI-11 is shown in the table. No additional DCI-11 is added to Ethanol Source A in either example. Source of Ethanol B refers to New Energy Denatured Ethanol which contains less than 1 ppm of sulfates and 0.9 PTB corrosion inhibitor.

Example 1

A fuel was prepared by mixing 84% Source of J5tanol A with 16% conventional conventional unleaded gasoline. The Ethanol A Source contained 32 PTB of Innospec DCI-11 corrosion inhibitor as supplied. This is shown in Table I. No additional DCI-11 was added to the mixture. When used engine oil was tested in the Ball Rust Test, Example 1 provided an AGV of 88 and contained 36 ppm of iron. The AGV results indicated a deterioration in the corrosion protection properties of the oil after use even if Example 1 contained a commercial corrosion inhibitor.

Example 2

A fuel was prepared with 84% Ethanol Sample B that did not contain a detectable amount of corrosion inhibitor. No other additives were added. When used engine oil was tested in the Ball Rust Test, Example 2 provided an AGV of 70 and

it had 26 ppm of iron. The AGV results indicated an even greater deterioration in the corrosion protection properties of the oil after aging compared to Example 1. This was to be expected since Example 2 did not contain a corrosion inhibitor.

Example 3

This fuel was prepared by mixing 84% Ethanol Sample A, which contains 32 PTB of Innospec DCI-11 corrosion inhibitor as supplied, with 16% of unleaded normal gasoline and 85 PTB of HiTEC® 6560 which contains a dispersant of Mannich. When the oil used in the engine was tested in the Ball Rust Test, Example 3 provided an AGV of 115 and contained 21 ppm of iron, which were both very good results. The AGV results indicated little or no deterioration in the oil's corrosion protection properties after aging compared to Example 1.

; Example 4

This fuel was prepared by mixing 84% Ethanol B Sample with 16% normal unleaded gasoline and 32 PTB HiTEC®., 6455 DDSA corrosion inhibitor. When the oil used in the engine was tested in the Ball Rust Test, Example 4 provided an AGV of 124 and

20, contained 18 ppm of iron, which were both very good results. The resuk. AGV results indicated little or no deterioration in the oil's corrosion protection properties after aging compared to Example 2.

These examples show surprising improvements and significant reduction in corrosion when a dispersant is added to a fuel that contains alcohol that contains corrosion inhibitor or that uses a DDSA instead of commercially available corrosion inhibitors. In addition, this reduction improves or prevents corrosion, which is indicative of better engine durability.

Table II below provides illustrations of some desired additive combinations for various fuels that contain ethanol where corrosion could be controlled or reduced in an engine that burns fuel that contains ethanol.

Table II

Fuel THE B Ç D AND F G H t J E85 40-200 120 E85 40-200 80 E85 40-200 100 E85 40-200 120 E85 40-200 140 E85 40-200 160 E85 40-200 100 E85 40-200 120 E85 40-200 100

Where quantities are in ppm of finished fuel:

A = HiTEC * 6400 PEA, HiTEC® 6560 Additive Package which includes a Mannich Dispersant or other suitable dispersants such as a succinimide, succinamide, polyalkylene amine, polyisobutylene amine and an amide

B = DCI-11 corrosion inhibitor C = Petrolite Totad 3222 corrosion inhibitor.

D = Petrolite Tolad 3224 corrosion inhibitor

E = Petrolite Tolad 357 corrosion inhibitor

F = MidContinental MCC5011E corrosion inhibitor

G = MidContinental MCC5011EW corrosion inhibitor

H = CorrPro 654 corrosion inhibitor

I = Nalco 5403 corrosion inhibitor

J = ENDCOR FE 9730 corrosion inhibitor

Table II illustrates examples of how corrosion inhibitors can be combined with one or more dispersing fuel additives, the result of which will be a reduction in or prevention of corrosion and / or an improvement in the durability of an engine that burns fuel. E85.

Thus, in a modality here a fuel is provided which comprises ethanol, gasoline, at least one corrosion inhibitor selected from the group consisting of HiTEC® 6455 corrosion inhibitor, Octel DCI-11 corrosion inhibitor, Petrolite Tolad 3222 corrosion inhibitor , Petrolite Tolad 3224 corrosion inhibitor, Nalco 5403 corrosion inhibitor, ENDCOR FE5 9730 corrosion inhibitor, MidContinental MCC5011E corrosion inhibitor,

MidContinental MCC5011EW corrosion inhibitor, CorrPro 654 corrosion inhibitor, NALCO 5403 corrosion inhibitor, ENDCOR FE 9730 corrosion inhibitor and Betz ® ACN 13 corrosion inhibitor or chemical equivalents thereof, and optionally one or more dispersing additives for fuel.

In one embodiment, the fuel is an E85 gasoline-ethanol blend.

In one embodiment in this case the ratio of corrosion inhibitor to fuel additive dispersant can be from approximately 1:20 to approximately 20: 1. In another embodiment, the ratio of corrosion inhibitor to fuel additive dispersant can be from about 1:10 to about 10: 1. In yet another embodiment, the ratio of corrosion inhibitor to dispersant fuel additive can be from approximately 1: 5 to approximately 5: 1.

In yet another embodiment, the minimum amount of corrosion inhibitor, such as DCI-11 or DDSA, is approximately 5

PTB and in another the amount is from_ $ of approximately 10 PTB to · approximately 50 PTB in the finished fuel. In addition, the fuel can, in one embodiment, contain from 30 -100 PTB of the dispersing fuel additive.

Other modalities of the present description will be evident to those skilled in the art by considering the specification and practice of the description presented in this case. As used throughout the specification and the claims, one and / or one may refer to one or more than one. Unless otherwise stated, all numbers that express quantities of ingredients, properties such as molecular weight, percentage, ratio, reaction conditions, and used in the specification and in the claims must be understood to be modified in all cases.

by the term approximately. ¹¹ Consequently, unless otherwise indicated, the numerical parameters presented in the specification and in the claims are approximations that may vary depending on the properties that are desired to be obtained by the present description. No matter what happens, and not as an attempt to limit the application of the equivalents rule to the scope of the claims, each numerical parameter should at least be considered in the light of the number of significant digits and by applying techniques common to the scope of the claims, each numerical parameter should at least be considered in the light of the number of significant digits reported and by the application of usual rounding techniques. Although the ranges and numerical parameters that present the broad scope of the description are approximations, the numerical values presented in the specific examples are presented as precisely as possible. Any numerical value, however, inherently contains certain errors that necessarily result from the standard deviation found in their respective testing measures. It is intended that such a report and examples are considered as examples only, with a true scope and spirit of the description being indicated by the following claims.

Claims (12)

1. Process for the reduction of corrosion in an internal combustion engine susceptible to corrosion and which burns a fuel composition containing alcohol that comprises a corrosion inhibitor, the said process characterized by the fact that it comprises: (a) combining the fuel with a dispersant additive for Mannich-based fuel, and (b) burning the fuel and dispersing additive for fuel in the engine, where the alcohol content of the fuel composition is from 74% by weight up to 85% by weight. 2. Process according to claim 1, characterized by the fact that the fuel also comprises gasoline. 15 3. Process according to claim 1, characterized by the fact that the alcohol is selected from the group consisting of methanol, ethanol, propanol, butanol and mixtures of any combination thereof. 4. Process according to claim 1, characterized by the fact that alcohol is ethanol. Process according to claim 1, characterized in that the corrosion inhibitor comprises a dodecenyl succinic acid (DDSA). 6. Process according to claim 1, characterized by the fact that the corrosion inhibitor is selected from the group consisting of 25 materials that have an NH ₂ (CH ₂ ) _n -NH- (CH ₂ ) _m OC ₈ - structure ₁₀ where neither are independently 1 through 10. 7. Process according to claim 1, characterized by the fact that the corrosion inhibitor is selected from the group consisting of those materials that have an NH2 (CH2) n-NH-C8-10 structure, where n is 1 30 to 10. 8. Process according to claim 1, characterized by the fact that the corrosion inhibitor comprises the result of the combination Petition 870180006996, of 26/01/2018, p. 4/10 of a carboxylic acid or diacid and an amine, diamine or polyamine. 9. Process according to claim 1, characterized by the fact that the corrosion inhibitor has a molecular weight less than 700 and is selected from the group consisting of monoamines, diamines, triamines, 5 polyamines, etherins, imines, imidazolines, thiadiazoles, monocarboxylic acids, dicarboxylic acids, p-phenylenediamine, dicyclohexylamine, substituted alkyl anhydrides and succinic acids, mixtures and reaction products thereof and salts thereof. 10. Process according to claim 1, characterized by the fact that the process further comprises: combine the fuel with at least one fuel additive selected from the group consisting of a phenolic; an impeded phenolic; an amine polyolefin; an aryl amine; a diphenyl amine; a monocarboxylic acid; a dicarboxylic acid; a polycarboxylic acid; a residue on the oxidized alkylphenolic; a formaldehyde polymer with 4- (1,1-dimethylethyl) phenol, a methyloxirane and oxirane; an octane improving material selected from the group consisting of tetraethyl lead, methylcyclopentadienyl manganese tricarbonyl, an azide, peroxide and alkyl nitrate; a monoester, a diester, an ether, a ketone, a diether, a polyether, a glyme, 20 a glycol, an oxirane, an aliphatic C ₁ -C ₈ hydrocarbon; a butylene oxide; a propylene oxide; an ethylene oxide; an epoxide; a butane; a pentane; a xylene; a nitrous oxide; a nitromethane; a phenate; a salicylate; a sulfonate; a nonylphenol ethoxylate; a fuel-soluble alkali detergent and a detergent that contains alkaline earth metal. 25 11. Process to improve the durability of an internal combustion engine that burns a fuel composition that contains an alcohol that comprises a corrosion inhibitor, the process characterized by the fact that it comprises: (a) combining the fuel with a dispersing additive 30 for Mannich base fuel, and (b) burning the fuel and the fuel dispersing additive in the engine, Petition 870180006996, of 26/01/2018, p. 5/10 in which the alcohol content of the fuel composition is from 74% by weight to 85% by weight. 12. Composition to reduce corrosion in an internal combustion engine that burns an alcohol-containing fuel, characterized 5 because it understands: (a) a corrosion inhibitor, (b) an alcohol, and (c) a Mannich-based dispersant; wherein the alcohol content of the fuel composition is from 10 74% by weight to 85% by weight. Composition according to claim 12, characterized in that the corrosion inhibitor comprises a dodecenyl succinic acid (DDSA). 14. Composition according to claim 12, characterized by the fact that the alcohol is selected from the group consisting of methanol, ethanol, propanol, butanol and mixtures of any combination thereof. 15. Composition according to claim 12, characterized by the fact that the alcohol comprises ethanol. 16. Composition according to claim 12, characterized by the fact that the fuel also comprises gasoline. Petition 870180006996, of 26/01/2018, p. 6/10