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Process for refining high purifity hexanpropylamide

A refining method, high-purity technology

Inactive Publication Date: 2006-06-28
XIANGTAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation process can ensure the quality of high-purity caprolactam is stable and reliable, but there are also obvious shortcomings such as long process, large investment, complicated process control, and large energy consumption.

Method used

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  • Process for refining high purifity hexanpropylamide
  • Process for refining high purifity hexanpropylamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0026] The Beckmann rearrangement product of cyclohexanone oxime contains about 43% of caprolactam (mass percentage, the same below), about 51% of sulfuric acid, and free SO 3 About 4% and impurities 2%, its flow rate is 25.2m 3 / h, discharged into the mixer through the pump, at 37.1m 3 / h is added with 20% ammonia water for neutralization, in the separator with 7.6m 3 / h After mixing the circulating caprolactam aqueous solution, the crude caprolactam oil is separated out, and the ratio is 24.4m 3 / h flow into the extraction tower. 54.4m added to the top of the tower 3 / h of pure benzene, use 0.8m for the extraction phase 3 / h water is washed to obtain a benzene-caprolactam solution, which contains about 20.5% of caprolactam, 76.8% of benzene, 2.6% of water and 0.1% of impurities.

[0027] Benzene solution at 92.5m 3 / h flow into the three-effect distillation tower, the top of the first tower distillates 42.3m of benzene 3 / h, 18.1m of benzene distilled from the top of the second ...

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Abstract

The invention relates to a refine method for caprolactam that takes process of neutralization reaction, pre-refining, concentrating and distilling, and impurity extracting to caprolactam to gain high purity caprolactam. The invention is simple technology, sharply decreases power consumption and operating density. It improves the quality of the product, and declines cost.

Description

Technical field [0001] The invention relates to a method for refining caprolactam. Background technique [0002] Caprolactam, scientific name ε-caprolactam, molecular formula C 6 H 11 NO, molecular weight is 113.16, structural formula: [0003] [0004] It is a white crystal at room temperature with a melting point of 69.3°C. As a monomer of polyamide 6, it is an important petrochemical product widely used in the manufacture of nylon and engineering plastics. [0005] There are many methods for preparing caprolactam, but there are only a few economical and reasonable industrial methods that can meet the polymerization requirements. "Encyclopedia of Organic Chemical Materials" second edition, volume 3 introduces the production methods and industrial status of caprolactam, mainly including cyclohexanone-hydroxylamine method, cyclohexane photonitrosation method and toluene method, among which the first two methods require benzene Cyclohexanone oxime is prepared and then rearranged...

Claims

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Application Information

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IPC IPC(8): C07D201/04C07D201/16
Inventor 罗和安吴剑
Owner XIANGTAN UNIV
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