Process for production of Epsilon-hexanolactam

A caprolactam and solution technology, applied in the field of ε-caprolactam production, can solve the problems of complex liquid phase rearrangement process and unfriendly environment

Active Publication Date: 2012-08-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing liquid-phase rearrangement process is complex, unfriendly to the environment, and economically problematic

Method used

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Embodiment Construction

[0017] In the method provided by the invention, the said rearrangement reaction in step (1) is carried out in a fixed bed or a fluidized bed reactor, and said catalyst is a molecular sieve catalyst with MFI structure, which preferably contains 50-90% by weight of Bar catalyst of high silica molecular sieve. The low-carbon alcohol used for feeding and the low-carbon alcohol used in the pretreatment catalyst bed can be the same or different. From the consideration of the economy and convenience of the method, the same low-carbon alcohol solution is generally used. Said low-carbon alcohol solution is selected from methanol or ethanol.

[0018] In the method provided by the present invention, the rearrangement reaction conditions of step (1) are: reaction temperature 300-400°C, preferably 360-390°C; reaction pressure 0.005-0.8MPa, preferably 0.02-0.5MPa; nitrogen flow rate 4-8L / gcat / hr, preferably 6-7L / gcat / hr; cyclohexanone oxime weight space velocity WHSV0.1-2h -1 , preferabl...

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Abstract

The invention discloses a method for producing epsilon-caprolactam. The method prepares the caprolactam with the purity up to over 99.99 percent by subjecting crude epsilon-caprolactam obtained in gas-phase Beckmann rearrangement reaction to distillation, separation, purification, recrystallization, hydrofining and other steps, and meets the requirements of industrial products.

Description

technical field [0001] The invention relates to a production method of ε-caprolactam. Background technique [0002] ε-caprolactam is an important organic chemical raw material, mainly used in the production of nylon 6 engineering plastics and nylon 6 fibers, of which: nylon 6 fibers are widely used in wool spinning, knitting, weaving, cord fabrics, carpets and other industries, nylon 6 engineering Plastics are widely used in industries such as electronics, automobiles, and packaging films. [0003] As of the end of 2005, the global production capacity of caprolactam has reached more than 4.4 million tons, while the total production capacity of caprolactam in my country has reached 350,000 tons, and the import volume has reached 493,000 tons. [0004] At present, the industrial production method of caprolactam is to use oleum as a catalyst and solvent, and cyclohexanone oxime undergoes a liquid-phase Beckmann rearrangement reaction. This process has the disadvantages of cor...

Claims

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Application Information

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IPC IPC(8): C07D201/04C07D223/10
CPCY02P20/584
Inventor 程时标张树忠赵燕慕旭宏闵恩泽
Owner CHINA PETROLEUM & CHEM CORP
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