A crude benzol refining process

By using a composite extraction solvent and a secondary distillation process, the problems of environmental pollution and high energy consumption in the refining of crude benzene have been solved, and the production of high-purity toluene has been achieved, reducing energy consumption and production costs.

CN117820071BActive Publication Date: 2026-05-29TANGSHAN RUIDA IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TANGSHAN RUIDA IND CO LTD
Filing Date
2023-11-09
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing crude benzene refining technologies suffer from environmental pollution, incomplete sulfide removal, high equipment investment, high energy consumption, and low product purity.

Method used

High-purity toluene is produced by using a composite extraction solvent, N-formylmorpholine and 1-(2-hydroxyethyl)-2-pyrrolidone, combined with a two-stage distillation extraction process, through multi-tower separation and extractive distillation.

Benefits of technology

It has enabled the production of high-purity toluene products, reduced energy consumption and production costs, reduced environmental pollution, and met the national standard GB/T 2284-2009 for superior grade coking toluene.

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Abstract

The application belongs to the technical field of chemical industry, and provides a crude benzene refining process, wherein the crude benzene is subjected to extraction of toluene fraction through a crude benzene separation unit, and then the toluene fraction is subjected to extraction distillation process to obtain pure toluene; the extractant used in the extraction distillation is N-formyl morpholine and 1-(2-hydroxyethyl)-2-pyrrolidone with a mass ratio of 0.8-1.4:1. The method provided by the application combines the composite extraction solvent and the secondary distillation extraction process to obtain toluene products with a purity of 99.99%, and the bromine value and the sulfur impurity content and other indexes of the toluene products reach the standard of superior product of coking toluene in the national standard GB / T 2284-2009.
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Citation Information

Patent Citations

  • Method for preparing high purity toluene from coking crude benzene

    CN101514136A

  • Extraction and rectification system for coking benzene and sulfur-bearing benzene and refining method thereof

    CN101913978A

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    CN204509216U