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Method for reclaiming solvent from aramid fiber polymeric compound

A technology for recovering solvents and polymers, which is used in the recovery of high-value solvents and additives, and in the field of solvent recovery from aramid polymers, can solve the problems of low quality of recovered solvents and complicated processes, and achieve clean production, simplified and efficient operation. , the effect of reducing production costs

Inactive Publication Date: 2008-03-05
SINOPEC OILFIELD SERVICE CORPORATION
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  • Description
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of complex process and low quality of recovered solvent in the existing para-aramid production process, and to invent a process that is simple, good in solvent quality, and capable of recovering additives from Method for recovering solvent in aramid polymer

Method used

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  • Method for reclaiming solvent from aramid fiber polymeric compound

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. As shown in Figure 1.

[0025] A method for reclaiming a solvent from an aramid polymer, comprising the steps of:

[0026] Powder rinse:

[0027] The aramid polymer powder is mixed evenly with the washing liquid under stirring, filtered, and 100 parts of the powder are repeatedly washed with 60-400 parts of washing water, and placed in the washed powder. The clean powder is used to prepare para-aramid. The washing liquid obtained by filtration becomes the raw material for solvent recovery.

[0028] Neutralize and clarify:

[0029] Use sodium hydroxide or sodium carbonate to neutralize the washing solution, clarify and filter to remove precipitated impurities, and obtain a clarified or filtered neutralized supernatant.

[0030] Dehydration and enrichment:

[0031] The neutralized solution is distilled and dehydrated under normal pressure conditions to...

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Abstract

The solvent recovering process of aramid fiber polymer includes the steps of rinsing, neutralizing, dewatering, separating and purifying. While recovering pyridine, the aramid fiber solvent and assistant are re-used. The technological process is simple and easy in control, and has been applied practically.

Description

technical field [0001] The present invention relates to a method for recovering solvents used in the production of chemical products, in particular to a method for recovering high-priced solvents and auxiliary agents used in the production of para-aramid polymers (poly-p-phenylene terephthalamide), Specifically, a method for recovering solvents from aramid polymers. Background technique [0002] P-phenylene terephthalamide fiber (para-aramid fiber) is a special fiber with high modulus. The production of para-aramid polymer (PPTA) requires a large amount of solvents such as N-methylpyrrolidone (NMP) and pyridine additives. The cost of the solvent and additives is high, which directly affects the economics of para-aramid production Therefore, both at home and abroad, the solvent used in the production process is recycled to reduce the production cost of para-aramid fiber and realize clean production. As far as the applicant knows, the current recovery methods for para-aramid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/02C08G69/32C08G69/46
Inventor 纪祥倪寒秋江志荣王金堂
Owner SINOPEC OILFIELD SERVICE CORPORATION
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