Method and equipment for preparing caprolactam from cyclohexanone oxime

A technology of cyclohexanone oxime and caprolactam, which is applied in the field of preparing caprolactam, can solve the problems of uneven bed temperature, high operation cost, short operation period and the like, and achieves the effects of reducing temperature rise, eliminating coking and increasing relative content
CN101434569AActive Publication Date: 2009-05-20CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2009-05-20

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Abstract

The invention relates to a method for preparing caprolactam with cyclohexanone-oxime, and a device used in the method. The method includes the steps as follows: after being heated, inert supporting gas containing a solvent is continuously put into a supporting gas intake of a first-class reactor of a multi-stage series reactor provided with a catalyst. Cyclohexanone- oxime is directly divided into two parts which then enter all stages of the multi-stage series reactor, thereby ensuring that reaction effluents are cooled. The supporting gas is separated and recycled to the supporting gas intake of the first-class reactor, and then products from a liquid phase reaction are separated and purified.
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Description

technical field

[0001] The invention relates to a method for preparing caprolactam from cyclohexanone oxime and equipment used in the method. More specifically, the present invention relates to a method for preparing caprolactam by gas-phase Beckmann rearrangement reaction of cyclohexanone oxime and the equipment used in the method. Background technique

[0002] The conversion of cyclohexanone oxime to caprolactam through liquid-phase Beckmann rearrangement reaction is a technology commonly used in industry at present, and the catalyst is mostly concentrated sulfuric acid or oleum. The selectivity of the method to caprolactam can reach more than 98.5%. The caprolactam produced by this method accounts for about 90% of the caprolactam production in the world. The biggest disadvantage of this method is that a large amount of low-value ammonium sulfate is produced by-product, followed by serious equipment corrosion and environmental pollution.

[0003] Aiming at the shortcomi...

Claims

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