Method for preparing epoxy chloropropane by cyclizing chloropropene

A technology of epichlorohydrin and chloropropene, which is applied in the chemical industry, organic chemistry, sustainable manufacturing/processing, etc., can solve the problems of low conversion rate epichlorohydrin yield and difficult control of reaction temperature, etc., to overcome The effect of not taking heat in time, inhibiting side reactions, improving conversion rate and selectivity

Active Publication Date: 2011-09-21
CHINA PETROLEUM & CHEM CORP +1
View PDF10 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the reaction temperature is not easy to control in the production of epichlorohydrin by the direct epoxidation of allyl chloride in the prior art, and the conversion rate and the yield of epichlorohydrin are not high. A new allyl chloride is provided A method for preparing epichlorohydrin by cyclization, which has the characteristics of stable reaction temperature, high conversion rate of hydrogen peroxide and high yield of epichlorohydrin

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 preparing epoxy chloropropane by cyclizing chloropropene
  • Method for preparing epoxy chloropropane by cyclizing chloropropene
  • Method for preparing epoxy chloropropane by cyclizing chloropropene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] according to figure 1 As shown, the number of theoretical plates in the stripping section of the catalytic distillation tower is 15, the separation efficiency of the catalytic reaction section is equivalent to 18 theoretical plates, and the catalyst is SiO 2 / TiO 2 Titanium-silicon molecular sieve with a molar ratio of 80, 30% by weight hydrogen peroxide and methanol mixture (methanol content 70% by weight) enters the first theoretical plate (counting from top to bottom, the same below) with a flow rate of 1.00 g / min, and allyl chloride is The flow rate of 2.00 g / min enters from the bottom of the catalytic reaction section, the operating temperature of the reaction section is 43-48°C, the weight ratio of the first part of the tower bottom to the second part of the material is 3:1, and the bottom of the tower is extracted at a flow rate of 3.00 g / min. The extraction at the bottom of the tower enters the top of the extraction tower with a theoretical plate number of 15, ...

Embodiment 2

[0025] according to figure 1 As shown, the theoretical plate number of the stripping section of the catalytic distillation tower is 30, the separation efficiency of the catalytic reaction section is equivalent to the theoretical plate number of 50, and the catalyst is SiO 2 / TiO 2 The titanium silicon molecular sieve of molar ratio 180, 50 weight % hydrogen peroxide and methanol mixture (methanol content 30 weight %) enter with 1.00 g / min flow, and chloropropene enters with 12.00 g / min flow from catalytic distillation column top, reaction section The operating temperature is 38-43°C, the weight ratio of the first part of the tower bottom to the second part of the material is 1:1, the tower bottom is extracted at a flow rate of 13.00 g / min, and the tower bottom is extracted into an extraction tower with a theoretical plate number of 40 At the top, the extraction agent ethylene glycol enters the bottom of the extraction tower at 25.00 g / min, and the oil phase at the top of the ...

Embodiment 3

[0027] according to figure 1 As shown, the number of theoretical plates in the stripping section of the catalytic distillation tower is 5, the separation efficiency of the catalytic reaction section is equivalent to the number of theoretical plates being 5, and the catalyst is SiO 2 / TiO 2 Titanium-silicon molecular sieve with a molar ratio of 20, 2% by weight hydrogen peroxide and methanol mixture (methanol content 50% by weight) enters the first theoretical plate with a flow rate of 1.00 g / min, and allyl chloride flows from the middle of the catalytic reaction section with a flow rate of 5 g / min Enter, the operating temperature of the reaction section is 42-46 °C, the weight ratio of the first part of the tower bottom to the second part of the material is 15:1, the bottom of the tower is extracted at a flow rate of 6.00 g / min, and the number of theoretical plates extracted from the bottom of the tower is 5 At the top of the extraction tower, the extractant 1,3-propanediol e...

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 invention relates to a method for preparing epoxy chloropropane by cyclizing chloropropene, which mainly solves the problems of difficulty in controlling reaction temperature, and low conversion rate and yield of epoxy chloropropane in the process of producing epoxy chloropropane by directly epoxidating chloropropene. The method comprises steps as follows: chloropropene, hydrogen peroxide andmethanol are subjected to epoxidation reaction in a catalytic distillation tower, the components are separated during the reaction, a tower top steam is condensed and refluxed, the first part of the tower bottom material is vaporized by a reboiler and returns to the catalytic distillation tower, the second part of the tower bottom material is used as a produced liquid stream I, and the weight ratio of the first part to the second part is (1-15):1, wherein the mixture of hydrogen peroxide and solvent can enter via the tower top, and the chloropropene can enter in any position from the upper part of the stripping section to the tower top; the stream I and an extractant respectively enter the bottom and top of a extraction tower, an epoxy-chloropropane-rich mixture stream II is produced fromthe tower top, and a methanol-rich mixture stream III is obtained from the tower bottom; the stream II enters a finished product tower, the chloropropene is produced from the tower top, the epoxy chloropropane is produced from the side stream, and small amounts of heavy components are produced from the tower bottom; and the stream III enters an extractant recovery tower, the methanol is produced from the tower top, and the recycled extractant is obtained at the tower bottom. The technical scheme provided by the invention solves the problems, and can be used for industrial production of epoxy chloropropane.

Description

technical field [0001] The invention relates to a method for preparing epichlorohydrin by cyclization of propylene chloride. Background technique [0002] Because epichlorohydrin contains active epoxy groups and chlorine atoms in its molecules, its chemical properties are quite active, and it has become an important basic organic chemical raw material and intermediate, and is widely used in the synthesis of epoxy resin, glycerin, and chlorohydrin rubber. , pharmaceuticals, pesticides, surfactants, FRP, ion exchange resins, coatings and plasticizers, etc. At present, epichlorohydrin is produced from propylene, and the production methods mainly include the chloropropene method and the allyl alcohol method. The chloropropene method, also known as the high-temperature chlorination method, is the main method for producing epichlorohydrin, with mature technology and flexible production process. But the allyl chloride method also has some serious defects, such as many by-products...

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): C07D303/08C07D301/12
CPCY02P20/10
Inventor钟禄平肖剑高焕新
OwnerCHINA PETROLEUM & CHEM CORP