SU1293199A1 - Method of processing sulfuric acid waste - Google Patents

Abstract

The invention relates to petrochemistry, in particular the processing of sulfuric acid wastes generated by sulfuric acid alkylation, purification, for example, benzene, or in processes using sulfuric acid. The prevention of sedimentation and the removal of sulfur and tar deposits from equipment and communications is achieved by using a certain mixture of substances (DM). Waste processing is carried out by emulsifying it with hydrocarbons at 20-13 C, mixing the emulsion with a hydrocarbon product heated to 240-400 ° C, mixing the mixture for 15-30 minutes, dividing it into liquid and gaseous products, and then cooling the gases in the mixing condenser, which is served CB — medium boiling oil fraction, dialkyl sulfide (DAS) and organic base (OS), taken in a volume ratio of 1: (O, 05-1) :( O, 02-0.15). DAS is a waste of oxidative demercaptation of a hydrocarbon feedstock containing dimethylethyl, methyl ethyl and dipropyl sulfides. OC - Amino compounds soluble in petroleum fraction and DAS, for example, morpholine, triethyl-, di-, and tributylamine, dimethylpropylene di-amine, tetramethyldipropylene-tri-triamine, polyethylene polyamine, or a mixture of dihep-TIL-, dioctyl- and dinonyl-aminopropionitriles. The method makes it possible to completely both prevent and remove gray and asphalt resins from processing equipment. 2 hp f-ly, 1 tab. S С /)

Description

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The invention relates to the technology of processing waste containing sulfuric acid, which is formed in significant quantities and the refining and petrochemical industries in the sulfuric acid alkylation, purification of various petroleum products, in the coking industry during the purification of benzene; in the chemical industry in processes where sulfuric acid is a catalyst or reagent.

The purpose of the invention is to prevent sedimentation and removal of sulfur and asphalt-tar deposits from the process equipment and communications of the cooling unit of the gaseous products.

The method is carried out as follows.

Hydrocarbon raw materials at 20-130 ° C are fed into the dispersant-mixer and at the same time the sulfuric acid waste is fed. The resulting fine dispersed emulsion of reaction products and starting materials is fed to a gas separator, where it is mixed with hydrocarbon feed heated to 240-400 ° C, and then to a reaction sump, where the mixture is kept for 15-30 minutes. Gaseous reaction products are fed to a condenser-mix, where a mixture of average boiling oil fraction, dialkyl disulfide and organic base is also introduced at a volume ratio of the components from 1: 0.05: 0.02 to 1: 1: 0, 15.

The results of the experiments are given in the table.

The data in the table show that the mixture of medium boiling oil fraction, dialkyl disulfide and organic base, in contrast to the known sulfur solvents, has an extremely high absorption capacity (80-800 g / l) and dissolution rate (1-3 h ) with respect to the sulfur and asphalt-resin deposits formed during the processing of sulfuric acid wastes. The volume ratio of the oil fraction, dialkyl disulfide and organic base (1: 0.05-1: 0.02-0.15) is optimal, since with a decrease in the ratio of dialkyl disulfide and organic base in the mixture below 1: 0.05 : 0.02 significantly reduced absorption capacity

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ABOUT

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and the dissolution rate (Example 11), and increasing the volume ratio above 1: 1: 0.15 no longer leads to a further significant increase in the absorptivity and dissolution rate (Example 12), and is economically viable (due to the increased consumption of organic - new).

Thus, carrying out the process by this method allows to completely dissolve and remove the resulting gray and asphalt-resin deposits from the process equipment and communications of the cooling unit of the gaseous products and thereby ensures long-term uninterrupted operation of the sulfuric acid waste processing unit.

Claims (3)

1. A method for processing sulfuric acid wastes, including emulsifying them with a hydrocarbon product at 20-130 ° C, mixing the resulting emulsion with a hydrocarbon product heated to 240-400 ° C, keeping the resulting mixture for 15-30 minutes, separating the mixture into liquid and gaseous products followed by cooling of the gaseous product in the mixing condenser, characterized in that, in order to prevent sedimentation and removal of sulfur and asphalt-resin deposits from equipment and communications, c. the mixing condenser serves a mixture of medium boiling oil fraction, dialkyl disulfide and organic ocHd-van at a volume ratio of components from 1: 0.05: 0.02 to 1: 1: 0.15. 2. Method POP.1, which differs from the fact that as a dialkyl disulfide, the waste of the process of oxidative demercaptanization of a hydrocarbon feedstock containing dimethyldiethyl, methyl methyl and dipropyl disulfide is used. 3. A method according to claims 1 and 2, about tl, which is based on the use of morpholine, triethyl-, dibutyl-, tributylamine, dimethylpropylene diamine, polyethylene-polyamine, or a mixture of diheptyl, dioxyl- and dinonylaminopropionitriles. eight 9 10 Mixture of diesel fractions, dialkyl disulfide (DADS) and dimethylpropylene 1: : 0.05: 0.02 80 The mixture of diesel fraction, DADS and morpholine 1: 1:: 0,1580 A mixture of the kerosene fraction, DADS and polyethylene Lenin 1: 0.2: 0.05 40 The mixture of diesel fractions i DADS and dibutylamine and 1: 0,6: 0,1 60 The mixture of diesel fraction, DADS and triethylamine 1: 0,8: 0,15 80 The mixture of diesel fraction, DADS and tributylamine 1: 1: 0.15 80 The mixture of diesel fraction, DADS and tetramethyl dipropylene triamine 1: 1: 0.160 Diesel fraction 80 Toluene80 Benzene 40 IN 2.5 40 800 1.0 ten 200 3.0 25 500 2.5 thirty 600 3.0 35 700 3.0 800 2.5 6 hours not completely dissolved The mixture of diesel fraction, DADS and dime tilpro saw n-diamine 1: 0.02:: 0,0180 A mixture of diesel fraction DADS and morpholine 1: 1.5: 0.3 70 Editor I. Segl Nick Compiled by N. Bogdanova Tehred L. Serdyukov Proofreader M. Pojo Order 346/27 Circulation 464, Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Table continuation 20 45 900 2.0