System and method for purifying crude caprolactam water solution

A technology for crude caprolactam and caprolactam is applied in the system field of purifying crude caprolactam aqueous solution using an ion exchange resin device, and can solve problems such as high consumption

Active Publication Date: 2008-06-04
CHINA PETROCHEM DEVMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Frequent resin replacement regeneration process consumes a lot of acid, alkali and water, and produces a lot of waste water to be treated

Method used

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  • System and method for purifying crude caprolactam water solution
  • System and method for purifying crude caprolactam water solution
  • System and method for purifying crude caprolactam water solution

Examples

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Embodiment Construction

[0033] The purpose and effects of the present invention are described in detail below by means of examples.

[0034] Figure 1A illustrates Embodiment 1 of the present invention. The system of the present invention includes a filter area 100, a detection unit 130, a purification area 200, and a first temporary storage device 300. A resin filter device, such as an ion exchange resin device group 110, is arranged in the filter area, and the crude oil is removed by resin adsorption and filtration. Ionic impurities in caprolactam aqueous solution to form filtered caprolactam aqueous solution. The crude caprolactam aqueous solution containing 30 to 40% caprolactam, water, and impurities generated by the Beckmann rearrangement reaction is introduced into the filter area 100 through the pipeline 10, and the ion exchange resin device group 110 located in the filter area 100 is used for resin filtration to remove Ionic impurities in the crude caprolactam aqueous solution form a filtere...

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PUM

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Abstract

The invention relates to a system and a method of purifying crude caprolactam solution. The system comprises (A) a filtering area, in which resin is utilized to filter out ionic impurities, (B) a detecting unit used for judging whether the solution filtered by the resin conforms to preset detecting standard, (C) a purifying area used for concentrating the solution that is filtered and conforms to preset detecting standard and (D) a first temporary storage device used for receiving and storing the solution that is filtered and is unqualified for preset detecting standard and also used for mixing solution therein with unfiltered crude caprolactam solution and leading the mixture to the filtering area once again. Continuous filtering is available to the system, thereby reducing operation changing frequency of the resin, having no final unqualified caprolactam and prolonging effective operation period of the resin device for filtering out ionic impurity; the system has the advantage of saving material and reducing waste.

Description

technical field [0001] The invention relates to a system for purifying crude caprolactam aqueous solution, in particular to a system for purifying crude caprolactam aqueous solution by using an ion exchange resin device. Background technique [0002] The industrial production of caprolactam is to make cyclohexanone oxime undergo Beckmann rearrangement reaction under the condition of fuming sulfuric acid to generate caprolactam. After the rearrangement reaction, the mixed aqueous solution containing fuming sulfuric acid and caprolactam is neutralized with ammonia water to produce Ammonium sulfate, then separate and purify ammonium sulfate and crude amide. Usually, the organic solvent benzene is used for the first extraction, and then water is used for the second extraction to release the caprolactam from the organic solvent, and a crude caprolactam aqueous solution containing 30 to 40% caprolactam is formed in the back extraction. [0003] Since caprolactam is an important r...

Claims

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Application Information

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IPC IPC(8): C07D201/16B01J20/26
Inventor 李建宪罗守礼钟佑政
Owner CHINA PETROCHEM DEVMENT
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