CN100368049C - a chemical demulsifier - Google Patents

Abstract

The invention discloses a chemical demulsifier, which contains at least one of the salts of alkylaryl sulfonic acid with formula I structure and amine with formula II or formula III structure, and auxiliary agent; the auxiliary agent is selected from One or more of water, alcohol, inorganic acid, carboxylic acid, aromatic solvent and aliphatic solvent; the mass percentage of the salt formed by the alkylarylsulfonic acid and amine of the formula I structure in the demulsifier is 10- 80%, the mass percentage of additives is 20-90%; the total mass percentage of alkylarylsulfonic acid with formula I structure in the salt is 20-50%, and the mass percentage of amine is 50-80% . The chemical demulsifier of the invention is a salt synthesized from an acid with amphiphilic amphiphobic properties and an amine with high surface activity and forms a uniform and stable demulsification system through an auxiliary agent, and can be widely used in demulsification treatment in crude oil exploitation and refinery refinery.

Description

a chemical demulsifier

technical field

The invention relates to a chemical demulsifier.

Background technique

Crude oil mostly exists in W/O type emulsion, but with the implementation of oilfield degradation and enhanced oil recovery, oil-water emulsion can also be O/W, W/O/W type emulsion, the existence of these emulsions gives crude oil Transportation and refining posed great difficulties. The stability of the emulsion is mainly determined by the nature and content of asphaltene, colloid, paraffin, petroleum acid soap and clay in crude oil. They act as natural emulsifiers adsorbed at the oil-water interface and interact to strengthen the liquid film. The strength prevents the condensation of water droplets.

The methods of demulsification generally include physical methods and chemical methods. Usually, in order to overcome the obstacles caused by the liquid film, the two methods should be combined. Usually physical methods include high voltage electric field demulsification, thermal demulsification, gravity and centrifugal sedimentation demulsification. Chemical demulsification, by adding chemical agents, partly replaces the natural active substances on the liquid film, destroys the liquid film, makes the droplets coagulate and settle, and realizes the separation of oil and water. The existing demulsifiers have poor demulsification ability, and it is difficult to achieve the purpose of demulsification and dehydration of oil-water emulsions in oilfields.

Contents of the invention

The object of the present invention is to provide a chemical demulsifier with strong demulsification ability.

The chemical demulsifier provided by the present invention contains at least one of the salts formed by the alkylarylsulfonic acid with the structure of formula I and the amine with the structure of formula II or formula III, and an auxiliary agent; the auxiliary agent is selected from One or more of water, alcohol, inorganic acid, carboxylic acid, aromatic solvent and aliphatic solvent; the mass percentage of the salt formed by the alkylarylsulfonic acid of the formula I structure in the demulsifier and the amine The content is 10-80%, the mass percentage of the auxiliary agent is 20-90%; the total mass percentage of the alkylarylsulfonic acid of the formula I structure in the salt is 20-50%, and the amine The mass percentage content is 50-80%;

Among them, R ₁ is an alkyl group with 10-24 carbon atoms, R ₂ is an alkyl group with 1-3 carbon atoms; R ₃ is an alkyl group with 10-24 carbon atoms, and R ₄ is H or carbon An alkyl group with 1 to 6 atoms, R ₅ is an alkyl group with 2 to 8 carbon atoms.

Wherein, commonly used amines are N,N-dimethyl cocoamine, N,N-dimethyl dodecylamine, N,N'-bis(dodecylmethyl)-hexamethylenediamine and the like.

Specifically, the auxiliary agent can be selected from one or more of water, methanol, ethanol, n-butanol, benzyl alcohol, acetic acid, benzene, toluene, xylene, aromatic naphtha and diethylene glycol monobutyl ether.

The preparation of alkyl aryl sulfonic acid used in the present invention can refer to literature (Journal of Surfactants and Detergents, Vol.5, No.1), carry out according to following reaction process:

Generally speaking, α-olefin sulfonate is a mixture of compounds with different carbon chain lengths. The alkylaryl sulfonic acid synthesized by the above method is also a mixture of sulfonic acids with different carbon chain lengths. The main components are 1,4-bis(dodecylethanesulfonate)benzene, 1,4-bis(tetradecylethanesulfonate)benzene, 1,4-bis(hexadecylethanesulfonate)benzene , 1,4-bis(octadecylethanesulfonate)benzene, etc.

The demulsifier of the present invention is a salt synthesized from acids with amphiphilic and amphobic properties and amines with high surface activity to form a uniform and stable demulsification system through auxiliary agents, and has good effects in demulsification and anticorrosion of crude oil emulsions, and can be widely used It is used in the demulsification treatment of crude oil extraction and refinery refinery.

Detailed ways

Embodiment 1,

Using α-olefin sulfonate (produced by Dongguan Wanlianxin Chemical Co., Ltd.) as raw material, according to the literature (Journal of Surfactants and Detergents, Vol.5, No.1) method to synthesize alkyl aryl sulfonic acid, the alkyl aryl Sulfonic acid is a mixture, the main components are 1,4-bis(dodecylethanesulfonate)benzene, 1,4-bis(tetradecylethanesulfonate)benzene, 1,4-bis(decylsulfonate) Hexaalkylethanesulfonate)benzene, 1,4-bis(octadecylethanesulfonate)benzene, etc.

Take 10 grams of the above-mentioned alkylaryl sulfonic acid and put it into a 250ml conical flask, add 150 grams of methanol, slowly add 40 grams of N,N-dimethyl cocoamine under stirring, and after the solution is uniform, the demulsifier EXAM- 1.

Embodiment 2,

Using α-olefin sulfonate (produced by Dongguan Wanlianxin Chemical Co., Ltd.) as raw material, according to the literature (Journal of Surfactants and Detergents, Vol.5, No.1) method to synthesize alkyl aryl sulfonic acid, the alkyl aryl Sulfonic acid is a mixture, the main components are 1,4-bis(dodecylethanesulfonate)benzene, 1,4-bis(tetradecylethanesulfonate)benzene, 1,4-bis(decylsulfonate) Hexaalkylethanesulfonate)benzene, 1,4-bis(octadecylethanesulfonate)benzene, etc.

Get 36 grams of the above-mentioned alkylarylsulfonic acid and put it into a 100ml Erlenmeyer flask, add 100 grams of n-butanol, slowly add 64 grams of N, N'-bis(dodecylmethyl)-hexanediamine under stirring, After the solution is uniform, the demulsifier EXAM-2 is obtained.

Embodiment 3, demulsifier demulsification effect experiment

1. Crude oil (outbound oil from Linpan oil production plant): brine (1000ppm salinity) is emulsified at a weight ratio of 1:1

Oil-water emulsion is 50ml per tube, preheated for 15 minutes before hand shaking 200 times. According to the GB8929-88 standard, the milk-breaking bottle test method is adopted. The results are shown in Table 1.

Demulsification effect of table 1 demulsifier

serial number Name of demulsifier Dosage (mg/L)   Dehydration temperature (°C)   Amount of demulsification and dehydration (ml) water color 30min 60min 90min 1 EXAM-1 120 42 16 twenty one twenty two clear 2 EXAM-1 80 42 13 19 twenty one clear 3 EXAM-1 60 42 8 15 twenty one clear 4 EXAM-2 120 42 19 twenty three twenty four clear 6 EXAM-2 80 42 14 19 twenty three clear 7 EXAM-2 60 42 11 17 twenty two clear 9 blank - - none none 3 clear

2. Crude oil (outbound oil from Linpan Oil Production Plant): brine (2000ppm salinity): Sipan 20 emulsified in a weight ratio of 49:49:2

Oil-water emulsion is 50ml per tube, preheated for 15 minutes before hand shaking 200 times. According to the GB8929-88 standard, the milk-breaking bottle test method is adopted. The results are shown in Table 2.

The demulsification effect of table 2 demulsifier

serial number Name of demulsifier Dosage (mg/L) Dehydration temperature (℃)   Amount of demulsification and dehydration (ml) Aqua 30min 60min 90min 1 EXAM-1 120 42 14 19 twenty two clear 2 EXAM-1 80 42 12 16 twenty one clear 3 EXAM-1 60 42 8 14 twenty one clear

4 EXAM-2 120 42 19 20 twenty three clear 6 EXAM-2 80 42 14 17 twenty two clear 7 EXAM-2 60 42 10 15 twenty two clear 9 blank - - none none 1 clear

The above results show that, compared with the blank control, the demulsifier of the present invention has obvious demulsification effect and strong demulsification ability.

Claims (3)

1. A chemical demulsifier, containing at least one of the salts formed by the alkylarylsulfonic acid with the formula I structure and the amine with the formula II or formula III structure, and an auxiliary agent; the auxiliary agent is selected from water One or more of alcohol, inorganic acid, carboxylic acid, aromatic solvent and aliphatic solvent; the mass percentage of the salt formed by the alkylarylsulfonic acid of formula I structure and the amine in the demulsifier is 10-80%, the mass percentage of the auxiliary agent is 20-90%; the total mass percentage of the alkylarylsulfonic acid of the formula I structure in the salt is 20-50%, and the amine The mass percentage content is 50-80%;

(Formula I)

(Formula II) (Formula III) Among them, R ₁ is an alkyl group with 10-24 carbon atoms, R ₂ is an alkyl group with 1-3 carbon atoms; R ₃ is an alkyl group with 10-24 carbon atoms, and R ₄ is H or carbon An alkyl group with 1 to 6 atoms, R ₅ is an alkyl group with 2 to 8 carbon atoms. 2. chemical demulsifier according to claim 1, is characterized in that: described amine is N, N-dimethyl coconut oil amine, N, N-dimethyl dodecylamine or N, N'- Bis(dodecylmethyl)-hexanediamine. 3. chemical demulsifier according to claim 1, is characterized in that: described auxiliary agent is selected from water, methyl alcohol, ethanol, n-butanol, benzyl alcohol, acetic acid, benzene, toluene, xylene, aromatic naphtha and One or more of diethylene glycol monobutyl ether.