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Method of eliminating miniature amount of impurities in epsilon-caprolactam water solution

A caprolactam, trace impurity technology, applied to the separation/purification of lactam, chemical instruments and methods, organic chemistry and other directions, can solve the problems of high regeneration cost, equipment corrosion, waste water with high COD content, etc., and achieves low regeneration cost. There is no effect of equipment corrosion

Inactive Publication Date: 2006-03-29
CHINA PETROLEUM & CHEM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limitations of this process are: the ion exchange resin needs to be regularly regenerated, and the regeneration cost is expensive; acid and alkali are required for regeneration, and equipment corrosion occurs; caprolactam is lost during backwashing and a large amount of wastewater with high COD content is produced.
[0003] The concentration of caprolactam aqueous solution required for ion exchange resin adsorption has certain requirements. If the concentration is too high, it will affect the ion exchange effect, and if the concentration is too low, it will increase the operating cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Pass an aqueous solution of ε-caprolactam with a concentration of 30%wt through an electrodialysis membrane device at 50° C., and the residence time of the material is 15 minutes. The experimental results are shown in Table 1.

[0014] Analysis Project

Embodiment 2

[0015] Example 2: An electrodialysis membrane device was used to pass an aqueous solution of ε-caprolactam with a concentration of 40%wt at 50°C. The material residence time was 30 minutes. The experimental results are shown in Table 2.

[0016] Analysis Project

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PUM

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Abstract

The present invention features that electric dialysis membrane is used to eliminate the inorganic impurities and miniature amount of organic impurities in water solution of epsilon-caprolactam, that is, water solution of epsilon-caprolactam of 5-90 wt% concentration is made to pass through electric dialysis membrane at 0-150 deg.c. The said method is used to replace ion exchange process for refining caprolactam and can reduce greatly the conductivity and extinction value of water solution of epsilon-caprolactam and eliminate ammonium radical, acid radical and other ions and miniature amount of organic impurities in water solution of epsilon-caprolactam. s

Description

technical field [0001] The invention relates to a method for removing trace impurities in ε-caprolactam aqueous solution, in particular to a method for removing inorganic impurities and trace organic impurities in caprolactam aqueous solution by using an electrodialysis membrane. Background technique [0002] ε-caprolactam is the main raw material for the production of nylon-6. In industry, in the refining and purification process, the inorganic impurities and trace organic impurities in the ε-caprolactam aqueous solution are removed by ion exchange resin adsorption. The limitations of this process are: the ion exchange resin needs to be regularly regenerated, and the regeneration cost is expensive; acid and alkali are required for regeneration, and equipment corrosion occurs; caprolactam is lost during backwashing and a large amount of wastewater with high COD content is generated. Therefore, for a long time, people have been looking for new methods to replace ion exchange...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D223/10C07D201/16
Inventor 文三王德清朱泽华何冀云李慧友傅送宝
Owner CHINA PETROLEUM & CHEM CORP
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