Method for separating acetonitrile-methylbenzene azeotropic mixture by continuous extractive distillation

A technology of azeotrope and extractive distillation, applied in the direction of extractive distillation, etc., can solve problems such as no data yet, and achieve the effect of facilitating automatic control

Inactive Publication Date: 2006-02-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many articles and patents on extractive distillation, but there is no publicly published information on extractive distillation and separation of acetonitrile-toluene azeotropic system

Method used

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  • Method for separating acetonitrile-methylbenzene azeotropic mixture by continuous extractive distillation

Examples

Experimental program
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Effect test

Embodiment 1

[0011] The diameter of the extractive distillation tower used is φ80mm, and DIXON packing is installed inside. The total height of the packing layer is 1.2m, of which 0.2m from the top of the tower is the extraction agent inlet, and 0.5m from the bottom of the tower is the raw material inlet. The extraction agent recovery tower has a diameter of φ80mm and is equipped with DIXON packing. The total height of the packing layer is 0.8m, and the feed port is in the middle of the tower. The raw material is an acetonitrile-toluene mixture (wherein containing 73% of acetonitrile, 27% of toluene, both in mass percent) is added in the tower by the raw material inlet of the extractive distillation tower at a flow rate of 1Kg / h, and the extractant 1,4-diethylbenzene From the extractant high-level tank, it is fed into the extractive distillation tower from the extractant inlet, the feed temperature of the extractant is 70°C, and the flow rate is 3Kg / h. At the top of the extractive distillat...

Embodiment 2

[0013] The device that adopts is the same as embodiment one. Acetonitrile-toluene mixture (wherein containing acetonitrile 73%, toluene 27%, is mass percent) is added in the tower by the raw material inlet of extractive rectification tower with the flow rate of 1Kg / h, and extractant propylbenzene is from extractant head tank by extractant The inlet is added to the extractive distillation tower, the feed temperature of the extractant is 40°C, and the flow rate is 4Kg / h. At the top of the extractive distillation tower, after the material vapor is condensed by the extractive distillation condenser, part of it is refluxed, and part of it is recovered as acetonitrile product. out, the reflux ratio is 3:1, the temperature is 81.5°C, and the purity of the extracted acetonitrile is 99.2%. At the bottom of the extractive distillation tower, the material partly enters the reboiler to be vaporized, and partly extracted, the output flow rate is 4.27Kg / h, the extracted material enters the...

Embodiment 3

[0015] N-butylbenzene was used as the extractant, and the operation method and device were the same as in Example 1. The purity of the obtained acetonitrile was 99.4%, and the purity of toluene was 99.9%.

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Abstract

The invention discloses a method for continuous extraction and distillation and separation of acetonitrile- toluene azeotrope. The method is described as the following: using propyl benzene, butylbenzene, isobutylbenzene, sec- butylbenzene, tertiarybutyl phenol, mesitylene, p- diethyl benzene or tertiary-butyl toluene as the extractant, operating in a extracting- fractionating tower at a normal pressure or reduced pressure with a mass ratio of extractant in extracting- fractionating tower to overhead being 2: 1- 10: 1 and a feeding temperature of extractant of 25- 80 Deg. C, the acetonitrile- toluene azeotrope entering from the middle of extracting- fractionating tower, picking the qualified content of acetonitrile from the head of tower with a reflux ratio of 1: 1- 5: 1, toluene and solvent from the bottom of the tower flowing into the middle of the extractant recovery tower, the toluene being picked from the head of extractant recovery tower with a reflux ratio of 2: 1- 10: 1, and the high-purity extractant which can be circularly used being picked from the bottom of the extractant recovery tower. The merit of the invention is that using extractant to destroy acetonitrile- toluene azeotrope,the high purity acetonitrile and toluene are prepared.

Description

technical field [0001] The invention relates to a method for separating acetonitrile-toluene azeotropic mixture by continuous extraction and rectification, which belongs to the steady-state extraction and rectification separation technology of acetonitrile-toluene azeotropic mixture. Background technique [0002] Acetonitrile and toluene are commonly used organic solvents in the pharmaceutical industry. The acetonitrile-toluene waste liquid produced in the pharmaceutical industry is difficult to separate and recover due to the azeotrope formed by acetonitrile-toluene, which will easily cause environmental pollution and increase the production cost of pharmaceuticals. Extractive distillation is a special distillation separation technology, which is suitable for the separation of azeotropic systems. Extractive distillation achieves the purpose of separation by continuously adding extractant to the top of the rectification tower to change the relative volatility of the original...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/40
Inventor 崔现宝周金波杨志才
Owner TIANJIN UNIV
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