SU859422A1 - Method of preparing raw material for carbon black production - Google Patents

Description

The invention relates to methodologies (obtaining raw materials for producing carbon black by processing liquid products of the pyrolysis of hydrocarbons and can be used in the petrochemical industry. A method is known for producing raw materials for the production of carbon blacks by rectifying liquid products of pyrolysis of carbon of hydrogen at a temperature at the bottom of an ISO-IGO tube. C. The indicated temperature is provided by feeding the lower part of the distillation column as a coolant from the easily boiling fractions of pyrocondensate (70150 ° C) removed from the upper part to (11. The disadvantage of the method is the polymerization of the heavy part of the product in the bottom of the column, which increases the propensity of the target product to coking. The closest to the present method is the method of obtaining raw materials for carbon black production by rectification of the pyrolysis liquid products in the presence of a benzene alkylation process using olefins - polyalkylbenzenes - byproducts of the production of isopropylbenzene, taken in an amount of 832 wt.% calculated on the target product 2. This method makes it possible to exclude polymerization in the bottom of the column, however, this results in dilution of pyrolysis products with polyalkylbenzenes (fractional composition: initial boiling point 180 ° C, 50% distillation of 210 ° C, late boiling point), having a density of 0.880 g / cm and a correlation index of 65. The resultant The target product has a correlation index not higher than 120. The purpose of the invention is to increase the degree of flavoring (correlation index) of the target product. The goal is achieved by the fact that in the process of obtaining raw materials for carbon black production by distillation of liquid products of the pyrolysis of hydrocarbons in the presence of chlacier, the fraction 205-460 C is used in the process of alkylation of benzene with ethylene or propylene, taken as 29% by weight product. The 205-460 ° C of alkylation of benzene with ethylene or propylene is a mixture of high-boiling aromatic compounds with a density of p <7 / 1.0 g / cm. The fraction has the following fractional composition: boiling point, 50% distillate, boiling point 460 ° C. The correlation index is 105. Using a fraction of benzene to alkylate benzene with ethylene or propylene as a refrigerant in an amount greater than 9% by weight of the raw material significantly reduces the degree of aromatization of the target product and increases the degree of clogging. soot grit and reduces yield. The use of the Descriptions of the Duty Refrigerant in an amount less than 2% of the weight of the raw material slightly increases the correlation index of the raw material, at the same time the tendency of the raw material to polymerization and the degree of clogging with soot by the grip increases.

EXAMPLE The reaction gases from the process of pyrolysis of gasoline, carried out at 750-800 ° C, after cooling to 200-240 ° C, are fed to the lower part of the distillation column. Fraction 205-460 0 (density 1,016 g / cm) of the preparation process with isopropylbenzene in the amount of 29 wt.% Calculated on the target product is also fed there. The temperature at the bottom of the column depends on the amount of refrigerant supplied and is 160-185 ° C.

From the target product column after

Filtration is directed to a storage tank.

In tab. 1 shows the physico-chemical parameters of the raw material for carbon black obtained in a known manner in comparison with the target product obtained by a limestone method using poly0 alkyl benzenes as a refrigerant, as well as the yield and quality of carbon blacks obtained from this raw material.

Table 1

Density Rd °, g / cm

1,070 1,068 1,062 1,058 1,040

fractional composition, with:

boiling point

50% distillate

Viscosity at 50 ° C, cSt

Correlation Index Soot Out, wt.%

Specific surface, m / g

Grate content

% (grid 014 ° K)

As follows from the data table. 1. The target product obtained by the proposed method has a higher correlation index and a lower tendency to the formation of grit in the production of carbon black than the product obtained in a known manner.

Example 2. Gasoline pyrolysis products are directed to the bottom of the distillation column. Same way

185

186

170 276

308

294

28

3933,125

132126

46,046,2 45,0

78,075,5

11, Q 0.013

0,0110,028

a fraction of 205-460 C (density 1.00 g / cm) of the process of producing ethylbenzene in the amount of 1-1E% calculated on the target product is fed. From the column of the target product, after filtration on. go to storage container. The quality of the raw material for carbon black obtained in Example 2, as well as the yield and quality of the carbon black obtained from this raw material are given in table. 2

2o J

PJ density g / cm

Correlation index Soot yield,%

Specific surface

Grate content, (mesh)

As can be seen from the data table. 2, the use of a refrigerant in an amount of less than 2 or more than 9 wt.% Leads to an increase in the degree of soot clogging. grit and the propensity of raw materials for soot to polymerization.

Claims (2)

Invention Formula A method for producing carbon black for the production of carbon black by rectification of the liquid products of the pyrolysis of hydrocarbons in the presence of a refrigerant based on the products of the benzene alkylation process with olefins, table 2 1,0671,0621,056 135132124 47,245,844,9 76,477,576,2 About € 180,0120,022 This is due to the fact that, in order to increase the degree of aromatization of the target product, a fraction of 205-4 ° C of the process of alkylation of benzene with ethylene or propylene is used as a refrigerant, taken in an amount of 2-9% by weight calculated on the target product. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 390130, cl. C 10 G 9/14, 1971. 2. USSR author's certificate number 614644, cl. C 10 G 7/00, 1976 (prototype).