SU1456445A1 - Method of producing low-activity carbon black - Google Patents

Abstract

The invention relates to the production of carbon black from a liquid hydrocarbon feedstock and can be used in the manufacture of tires and rubber products. The goal is to reduce the specific surface, reduce the consumption of raw materials and the optical density of the soot gasoline extract. The invention describes a method for producing low carbon black, which includes heating a hydrocarbon feed containing thermogas oil, into which a gas oil fraction 270-420C of catalytic cracking is introduced before heating with a content of 25-35% naphthalene in the amount of 80-95% by weight of the raw material, followed by the reactor serves raw materials and air in the amount of 2.1 - 2.3 m / kg of raw materials. Then, the campsites are burned, and the resulting soot-gas products are cooled and the soot is separated from them. The invention allows to reduce the specific consumption of raw materials to 1.712-1.754 soot while reducing the specific surface area and optical density of the gasoline extract of low-active soot. 3 tab. (Oh (L

Description

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The invention relates to the production of carbon black from a liquid hydrocarbon feedstock, namely, low active carbon black, intended for use in the manufacture of tires and rubber products.

The aim of the invention is not to reduce the dispersion of soot and the specific consumption of raw material for its production.

The essence of the invention is in TOMj that the raw material containing 70-95% of the gas oil fraction 270-420 ° C catalytic cracking with a content of 25-35% naphthalene compounds and 5-30%

thermogasoil - flavored products of thermal cracking, heated, served with air in the amount of the last 2.1-2.3 raw materials into the reactor, burned and thermally decomposed to form soot.

The component of the gasoil-thermal cracking feedstock is obtained on a typical installation of hot bitumen thermal cracking under pressure at 490-550 C by cracking phenolic extracts of distillates and catalytic cracking gas oils, followed by rectification of liquid cracking products and

and SP

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the output of flavored fractions 200- 460 C as a raw material for soot. The catalytic cracking fraction used in the mixture with thermo-gasoil, 270-420 ° C, is obtained in the process of catalytic cracking of prone gas oil-oil fractions in new installations. and using sludge as a recycler, which makes it possible to increase the aroma content of the fraction 270–420 ° C.

Example 1. Raw materials containing 70% of the fraction 270-420 0 of catalytic cracking containing 25% naphthalene compounds and 30% thermogas oil in the amount of 1950-2200 kg / h under an overpressure of 2.0-2.5 MPa, previously heated to 80- 100 s, is fed to a vertical reactor. The air in the combustion zone of the reactor is supplied in the amount of 2.2 raw materials. Under pressure, the soot that forms at 1180-1280 C passes through a refrigerator-evaporator, where it is cooled to 220-230 ° C due to the injected water.

From the refrigerator, the carbon-black gas mixture is exhausted by a smoke exhauster into an electrostatic precipitator to separate soot from gases. The resulting soot has the following indices: the specific conditional surface 18 absorption of dibutyl phthalate, 95 ml / 100 g, and the optical density of the gasoline extract is 0.09. The specific consumption of the raw material is 1,754 carbon black.

Table 1 presents the indicators of current standards for raw materials for

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the production of low carbon black according to the invention.

Table 2 presents the data of the properties of the soot obtained by the proposed method, the specific consumption for this raw material and the results of comparative examples.

Table 3 shows the effect of air consumption on the specific consumption of raw materials and the properties of carbon black obtained according to the invention in comparison with the known.

The combination of features of the invention reduces the specific

5 consumption of raw materials up to 1.712-1.754 soot with a decrease in the specific conditional surface and optical density of the gasoline extract of inactive soot, while reducing the cost of raw materials.

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Claims (1)

Invention Formula 0 A method for producing low-active 5 soot, including heating a hydrocarbon feedstock containing flavored thermal cracking products — thermogas oil, feeding raw materials and air into the reactor, burning and thermally, decomposing the feedstock, cooling the resulting soot-gas products, and separating carbon black from them, characterized in that in order to reduce the specific surface and reduce the consumption of raw materials and the optical density of the gasoline soot extract, a gas oil fraction of 270–420 ° C of catalytic cracking with holding 25-35% of naphthalene compounds in the amount of 70-95% by weight of the raw material, and the air is supplied., in the amount of 2.1-2.3 raw materials. 0 WITH, with 0.990 1.02 1.01. 200-460 270-420 240-460 Table 1 Is specific conditional noBepxr .: i -. bone, m2 / g 23 20 19 t9 19 18 H 12 21 18 15 12 Absorption dibutylgortalata, ml / 100 g 98 92 94 96 90 95 100 100 95 96 98 100 Continuation of the table.2 Indicators The content of naphthalene compounds in a fraction of 270-420 C, wt.% The number of injected fractions 270-420 C, when submitting voedukha 2.2 m / kg of raw materials 5 |; 70 JgS 98 g 65 70 G95 98 Gb5 70 | 95 T98 Optical density petrol ",", extract 0.05 0.10 0.04 0.08 jg, 18 0.09 0.05 0.04 0.03 0.08 0.05 0.06 Specific consumption of raw materials, m / kg of carbon black Table3 Air consumption, cm / kg of raw material Known for feeding 85% of the fraction 270 ° Indicators 20 ° C 2.0 2.1 2.3 J 2.4 The specific condition,,. to the surface CMVr14: 15 16 20 19 Dibutyl phthalate absorption,. ml / 100 g 90 92 94 96 90 Optical density of the gasoline extract 0.25 0.08 0.07 0.06 0.1 Specific consumption raw material, m / kg carbon black1,712 1,718 1,739 1,773 1,773 Costs in rubles per 1 ton of raw material 88.49 88.80 89.89 91.64 96.61 Compiled by L.Romantseva Editor G.Gerber Tehred.M.Didyk  Order 7522/22 CASE 630 Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 production and printing company, Uzhgorod, st. Project, 4