A kind of purification method and device of caprolactam

A caprolactam and purification method technology, applied in the separation/purification of lactam, chemical instruments and methods, organic chemistry, etc., can solve the problems of fragility, low washing efficiency, large investment, etc., and achieve the effect of convenient operation and simple structure
CN104059018BActive Publication Date: 2016-10-26CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2016-10-26

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Abstract

The invention provides a caprolactam purification method and device, and the method includes crystallization, countercurrent washing, solvent evaporation and other processes, is in no need of solid-liquid separation, can produce high-quality epsilon-caprolactam refining products, and is especially suitable for refinement of crude epsilon-caprolactam obtained by gas phase rearrangement. The caprolactam purification device includes a crystallizer, a countercurrent scrubber, a heater and distillation equipment which are sequentially communicated, has the advantages of simple structure and capability of continuous operation, and is applicable to the purification process of crude caprolactam.
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Description

technical field

[0001] The present invention relates to a preparation method and device for ε-caprolactam. More specifically, it relates to a purification method and purification apparatus for crude ε-caprolactam containing impurities. Background technique

[0002] ε-caprolactam (hereinafter referred to as caprolactam) is an important monomer of synthetic fibers and synthetic resins, mainly used in the manufacture of polyamide fibers (nylon 6), resins and films. The known production methods of caprolactam include cyclohexanone oxime liquid-phase Beckmann rearrangement method using oleum as catalyst, cyclohexanone oxime gas-phase Beckmann rearrangement method using solid zeolite as catalyst, and methods such as depolymerization of waste polymers. . The caprolactam prepared by these methods inevitably contains a large variety of organic impurities, which seriously affect the quality of caprolactam, and therefore must be purified before application. Known caprolactam purific...

Claims

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