Waste toluene recovery method in chemical production

A technology of chemical production and recovery methods, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve problems such as unfavorable production, interference with reaction process, side reactions, etc., achieve good results, improve reaction yield, and operate simple effect

Inactive Publication Date: 2016-05-25
安徽泰格生物技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Toluene is an extremely important solvent in chemical production, but after using the existing toluene to be directly distilled and recovered, there are still some impurities in toluene, which will interfere with the normal reaction process or directly cause side reactions during pr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the chemical reaction, add concentrated sulfuric acid to 1000mL of waste toluene to make the pH of the waste toluene 2, stir for 30 minutes, add 330mL of deionized water, stir for 60 minutes, let stand for 60 minutes, extract, take the upper layer Continue to add 200mL of deionized water to the solution, fully stir for 60 minutes, let stand for 60 minutes, extract, and take the upper layer to recover by distillation. Toluene is obtained for reaction, and its yield and product content are all indistinguishable from new toluene.

Embodiment 2

[0024] In the chemical reaction, add concentrated sulfuric acid to 8000L of waste toluene to make the pH value of the waste toluene 4, stir for 60 minutes, add 1600L of deionized water, stir for 30 minutes, let stand for 30 minutes, extract, take the upper layer Continue to add 1600mL of deionized water to the solution, fully stir for 30 minutes, let it stand for 30 minutes, extract, and take the upper layer to recover by distillation. The obtained toluene is used in the reaction, and its yield and product content are all indistinguishable from new toluene.

Embodiment 3

[0026] In the chemical reaction, add concentrated sulfuric acid to 6000L of waste toluene to make the pH value of the waste toluene 2, stir for 30 minutes, add 1500L of deionized water, stir for 40 minutes, let stand for 40 minutes, extract, take the upper layer Continue to add 1500L deionized water to the solution, stir fully for 40 minutes, let it stand for 40 minutes, extract, and take the upper layer to recover by distillation. The obtained toluene is used in the reaction, and its yield and product content are all indistinguishable from new toluene.

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PUM

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Abstract

The present invention discloses a waste toluene recovery method in chemical production. The method comprises the steps of: A, adjusting the pH value of the waste toluene by acid to 2-4, and then stirring; B, adding deionized water, continuing stirring, washing, standing for stratification and extracting a supernatant; C, repeating the step B; and D, recovering toluene by distillation. The method of the present invention can sufficiently remove waste toluene impurities in chemical production, has simple operation and good effect, and solves the problems of waste toluene recycling and reuse in chemical production.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for recovering waste toluene in chemical production. Background technique [0002] Toluene is an extremely important solvent in chemical production, but after using the existing toluene to be directly distilled and recovered, there are still some impurities in toluene, which will interfere with the normal reaction process or directly cause side reactions during production, which will bring disadvantages to production , so proper treatment of waste toluene in chemical production is of great significance to improving reaction yield, reducing production costs, and reducing environmental pollution caused by emissions. Production is extremely important. Contents of the invention [0003] The purpose of this invention is to provide a kind of recovery method of waste toluene in chemical industry production. [0004] The recovery method of waste toluene in a kind of chemical...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C15/06
CPCC07C7/005C07C15/06
Inventor 吴勇权
Owner 安徽泰格生物技术股份有限公司
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