Caprolactam production method

A technology of caprolactam and cyclohexanone, which is applied in the field of caprolactam production, can solve the problems of large consumption of oleum, low yield of reaction products, complex refining system, etc., and achieve saving of construction investment and production costs, high product yield, The effect of the stability of the preparation process

Active Publication Date: 2013-04-03
CHINA PETROLEUM & CHEM CORP
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The refining system of this method is complex, expensive precious metal catalysts are used, and the by-product thiamin is much more, and the by-product thiamine is 3.1~4.1 tons/ton caprolactam
However, its raw material toluene is rich in resources, and there are many intermediate products with high added value
All three pro

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Caprolactam production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] The present invention produces caprolactam such as figure 1 As shown, it mainly includes toluene oxidation process 1, benzoic acid hydrogenation process 2, amidation process 3, rearrangement reaction process 4, oximation process 5, ammonia oxidation process 6, and sulfuric acid absorption process 7. Toluene oxidation process 1 uses toluene as raw material, oxidized to benzoic acid with air under the action of cobalt acetate catalyst, reaction pressure 1000KPa, reaction temperature 170±5℃, single-pass conversion rate of reaction is 15%, selectivity of benzoic acid is 92%. In benzoic acid hydrogenation process 2, benzoic acid is hydrogenated under the action of ruthenium carbon catalyst to generate cyclohexanecarboxylic acid (CCA), the reaction pressure is 1500KPa, the reaction temperature is 170±5℃, the conversion rate and CCA selectivity of the reaction are clos...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention provides a caprolactam production method, which comprises the following processes that: toluene is oxidized under an effect of a cobalt salt catalyst to generate benzoic acid, benzoic acid is subjected to hydrogenation under an effect of a palladium carbon catalyst to generate cyclohexanecarboxylic acid, the cyclohexanecarboxylic acid and nitrosylsulfuric acid are subjected to an amidation reaction in an amidation reactor to generate an amide liquid, cyclohexanone is subjected to an oximation reaction to generate cyclohexanone oxime, the amide liquid and the cyclohexanone oxime are subjected to a rearrangement reaction in a rearrangement reactor, and the reaction product is subjected to processes such as neutralization, crystallization, extraction and refinement to prepare the ??caprolactam, wherein a rearrangement reaction temperature is 70-130 DEG C, pressure is 0-1.0 MPa, and a molar ratio of the acid in the amide liquid to the cyclohexanone oxime is 1-2:1. With the present invention, combination of the two processes such as a toluene method and a cyclohexanone-hydroxylamine method is achieved, a caprolactam yield is increased without increase of ammonium sulfate by-production, nicotinic acid consumption and ammonium sulfate by-production are reduced, the production process is simplified, and construction investment and production cost are saved.

Description

technical field [0001] The invention belongs to the technical field of chemical product production, and relates to a method for producing caprolactam, in particular to a method for preparing caprolactam by mixing cyclohexanone oxime by cyclohexanone-hydroxylamine method and amide solution by toluene method for rearrangement reaction. Background technique [0002] Caprolactam is an important organic chemical raw material, mainly used in the production of nylon 6 engineering plastics and nylon 6 fibers. Nylon 6 engineering plastics are mainly used as components and components of automobiles, ships, electronic appliances, industrial machinery and consumer goods. Nylon 6 fiber can be made into textiles, industrial silk and carpet silk, etc. In addition, caprolactam can also be used to produce anti-platelet drugs, laurocaprazine, etc., and has a wide range of uses. [0003] The production methods of caprolactam mainly include cyclohexanone-hydroxylamine method, photonitrosation ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07D223/10C07D201/06
CPCY02P20/52
Inventor 毕建国王志侃霍建竹
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap