Method of separating N-methyl pyrrolidone from massive chloroform systems

A methyl pyrrolidone and its separation technology, applied in the field of fine chemistry, can solve problems such as partial acidity, accelerated NMP decomposition, deterioration, corrosion of equipment, etc., to improve separation efficiency and product recovery rate, prevent NMP decomposition, and prolong equipment life. Effect

Active Publication Date: 2020-03-27
山东聚芳新材料股份有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is mainly aimed at the situation that a large amount of chloroform contains a small amount of NMP, chloroform is heated and decomposed to easily generate hydrochloric acid, causing the overall system to be acidic, accelerating the decomposition and deterioration of NMP, and corroding equipment; at the same time, chloroform is difficult to condense under high vacuum, and the content of chloroform in the tail gas High, pollute the environment, low recovery rate and other problems and redesign the new technical solution

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  • Method of separating N-methyl pyrrolidone from massive chloroform systems

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Effect test

Embodiment 1

[0019] A kind of method for separating N-methylpyrrolidone from a large amount of chloroform system, concrete steps are as follows:

[0020] Get the chloroform system containing 8% NMP and transport it to the middle part of the azeotropic rectification tower, and deliver the entrainer to the first layer plate of the azeotropic rectification tower according to 7% of the chloroform mass in the above-mentioned system at the same time, utilize the entrainer water and chloroform The principle of forming the lowest azeotrope, the lowest azeotrope is distilled to the top of the tower, condensed to the reflux tank, and then the chloroform and the azeotropic agent are not dissolved and separated, and the upper layer of the top reflux tank is the azeotropic agent, and the lower layer is chloroform. The entrainer returns to the entrainer inlet of the azeotropic rectification column to continue recycling, and the chloroform is extracted. Control the operating pressure of the entrainer rec...

Embodiment 2

[0022] A kind of method for separating N-methylpyrrolidone from a large amount of chloroform system, concrete steps are as follows:

[0023] Get the chloroform system that contains 7%NMP and deliver to the middle part of the azeotropic rectification tower, transport the entrainer to the first floor plate of the azeotrope rectification tower by 15% of the chloroform quality in the above-mentioned system, utilize the entrainer water / ethanol ( 9:1) The principle of forming the lowest azeotrope with chloroform, the lowest azeotrope is distilled to the top of the tower, condensed to the reflux tank, and then the chloroform and the azeotropic agent do not dissolve each other, layered, and the upper layer of the top reflux tank is azeotropic agent, the lower floor is chloroform, and the entrainer returns to the entrainer inlet of the azeotropic rectification tower to continue recycling, and the chloroform is extracted. Control the operating pressure of the entrainer rectification tow...

Embodiment 3

[0025] A kind of method for separating N-methylpyrrolidone from a large amount of chloroform system, concrete steps are as follows:

[0026] Get the chloroform system that contains 9%NMP and deliver to the middle part of the azeotropic rectification tower, transport the entrainer to the first floor plate of the azeotrope rectification tower by 10% of the chloroform quality in the above-mentioned system, utilize the entrainer water / methanol ( 9:1) The principle of forming the lowest azeotrope with chloroform, the lowest azeotrope is distilled to the top of the tower, condensed to the reflux tank, and then the chloroform and the azeotropic agent do not dissolve each other, layered, and the upper layer of the top reflux tank is azeotropic agent, the lower floor is chloroform, and the entrainer returns to the entrainer inlet of the azeotropic rectification tower to continue recycling, and the chloroform is extracted. Control the operating pressure of the entrainer rectification to...

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Abstract

The invention belongs to the field of fine chemical engineering, and relates to a method of separating N-methyl pyrrolidone (NMP) from massive chloroform systems. According to the method, an azeotropic distillation tower and a NMP refining tower are used together, an entrainer is collected from the top of the azeotropic distillation tower, and refined NMP is collected from the bottom of the NMP refining tower. The method has the advantages that the vacuum degree is low, the chloroform can be well cooled therefore, by strictly controlling the temperature of the whole tower, the acidifying of chloroform is inhibited; the equipment corrosion and NMP decomposition are prevented; the separation efficiency is improved, the product recovery rate is increased, and at the same time, the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to the field of fine chemistry, and specifically provides a method for separating N-methylpyrrolidone from a large amount of chloroform system. Background technique [0002] N-methylpyrrolidone (NMP) is an important chemical raw material, which is widely used in many fields such as polymerization solvent and extraction agent. However, separating NMP from the mixture and recycling it after purification is a difficult problem often encountered in the use of NMP. Using chloroform to extract and separate NMP from various mixed systems is a commonly used separation method in industry. For example, in the production of para-aramid fiber, polyphenylene sulfide fiber and many other products, chloroform extraction is used for separation. NMP. The advantage of using chloroform to extract NMP is high extraction efficiency and low NMP residue, but the disadvantage is also obvious. In order to extract NMP as clean as possible, a large amount...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D207/267
CPCC07D207/267
Inventor 杨颖郑亭路刘余田侯晓锋
Owner 山东聚芳新材料股份有限公司
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