Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for carrying out high efficiency premixing reaction

A pre-mixing and reaction technology, applied in chemical instruments and methods, preparation of lactam, organic chemistry, etc., can solve the problems of many by-products, low single-pass conversion rate, long residence time and other problems of amidation reaction, and achieve material retention small size, high mass transfer efficiency, and short residence time

Inactive Publication Date: 2007-11-07
CHINA PETROLEUM & CHEM CORP +1
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the industry, stirring or forced circulation of reaction materials is usually used to realize the premixing reaction. Due to the low mixing efficiency, long residence time and local high temperature, the simultaneous sulfonation side reaction in the reaction system can produce sulfonation which accounts for more than 10% of the caprolactam output. By-products, resulting in many by-products of amidation reaction and low single-pass conversion rate, become the bottleneck restricting the overall process level

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
  • Method for carrying out high efficiency premixing reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Use the stainless steel plate film that aperture is 1 μ m as dispersion medium, take 5% cyclohexane carboxylic acid n-hexane solution and oleum as reaction material, the volume flow ratio of cyclohexane carboxylic acid n-hexane solution and oleum is 100: 1. After the two phases are mixed, the flow velocity along the surface of the dispersion medium is 0.1m / s, and the reaction time is 0.1s. Measure the concentration of cyclohexane carboxylic acid remaining in the n-hexane solution after the reaction, and obtain it based on cyclohexane carboxylic acid The conversion rate of the reaction is 51.2%.

Embodiment 2

[0019] Use a glass flat membrane with a pore size of 0.2 μm as the dispersion medium, take 10% n-hexane carboxylic acid solution and oleum as the reaction materials, and the volume flow ratio of the n-hexane carboxylic acid solution and oleum is 50 : 1, after the two phases are mixed, the flow velocity along the surface of the dispersion medium is 1m / s, and the reaction time is 0.01s. After measuring the remaining cyclohexanecarboxylic acid concentration in the n-hexane solution after the reaction, it is determined that the cyclohexanecarboxylic acid is used as a benchmark The reaction conversion rate is 83.3%.

Embodiment 3

[0021] A stainless steel tubular membrane with a pore size of 5 μm is used as the dispersion medium, and 10% n-hexane solution of cyclohexanecarboxylate and oleum are used as reaction materials, and the volume flow ratio of n-hexane solution of cyclohexanecarboxylate and fuming sulfuric acid is 5 : 1, after the two phases are mixed, the flow velocity along the surface of the dispersion medium is 2m / s, and the reaction time is 0.01s. After measuring the remaining cyclohexanecarboxylic acid concentration in the n-hexane solution after the reaction, it is determined that the cyclohexanecarboxylic acid is used as a benchmark The reaction conversion rate is 93.6%.

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

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for carrying out high efficiency premixing reaction, which comprises securing dispersive medium in a reactor, using cyclohexane carboxylic normal hexane solution and sulfuric acid fuming as the reaction mass, loading them from the two sides of the dispersive medium in the reactor, under the action of the pressure difference, the cyclohexane carboxylic normal hexane solution crossing the dispersive medium by a finite flow quantity, dispersing into mini droplets and contacting the sulfuric acid fuming on another side for reaction, the reaction time is regulated by the mobility speed and flow distance along the dielectric surface after the two phase mixing.

Description

technical field [0001] The invention belongs to the technical field of synthesis of organic chemical raw materials, in particular to a premixing reaction method. Background technique [0002] Caprolactam is an important organic chemical raw material, mainly used in the production of nylon fiber and nylon resin. It is also an excellent solvent and has a wide range of applications. The toluene method is an important method for the production of caprolactam, including three main steps of oxidation of toluene, hydrogenation of benzoic acid and amidation of cyclohexane carboxylic acid. [0003] According to the reaction mechanism, the amidation reaction includes two series processes of cyclohexane carboxylic acid and oleum premixed reaction to generate mixed anhydride, and mixed anhydride and nitrosyl sulfuric acid to generate caprolactam. In the industry, stirring or forced circulation of reaction materials is usually used to realize the premixing reaction. Due to the low mixin...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C07D201/08C07D223/10
Inventor 骆广生吕阳成陈桂光徐建鸿王凯
Owner CHINA PETROLEUM & CHEM CORP