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Production method of epichlorohydrin

A technology of epichlorohydrin and chloropropene, which is applied in sustainable manufacturing/processing, chemical industry, climate sustainability, etc., can solve the problems of low conversion rate and selectivity, difficult control of reaction temperature, etc., and achieve good technology effect, overcome the untimely heat extraction, improve the conversion rate and selectivity

Inactive Publication Date: 2011-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the reaction temperature is not easy to control, the conversion rate and the selectivity are not high in the production of epichlorohydrin by the direct epoxidation of propylene chloride in the prior art, and a new method for producing epichlorohydrin is provided , the method has the characteristics of stable reaction temperature, high conversion rate of hydrogen peroxide and high selectivity of epichlorohydrin

Method used

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Experimental program
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Effect test

Embodiment 1

[0015] according to figure 1 As shown, the catalytic distillation tower operates under normal pressure, the number of theoretical plates in the stripping section 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 of 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 g / min, and allyl chloride is The flow rate of 2 g / min enters from the bottom of the catalytic reaction section, the temperature of the catalytic reaction section is 38-43°C, and the bottom of the tower is extracted at a flow rate of 3 g / min. It has been operated stably for 5000 hours. The catalytic distillation results are shown in Table 1.

Embodiment 2

[0017] according to figure 1 As shown, the catalytic distillation tower operates under normal pressure, the number of theoretical plates in the stripping section is 30, the separation efficiency of the catalytic reaction section is equivalent to 50 theoretical plates, and the catalyst is SiO 2 / TiO 2 Titanium-silicon molecular sieve with a molar ratio of 180, 50% by weight of hydrogen peroxide and acetone mixture (80% by weight of acetone content) enters the first theoretical plate with a flow rate of 1 g / min, and allyl chloride enters the first theoretical plate with a flow rate of 12 g / min from the bottom of the catalytic reaction section Enter, the temperature of the catalytic reaction section is 35-41°C, the bottom of the tower is extracted at a flow rate of 13 g / min, and it has been operated stably for 3000 hours. The catalytic distillation results are shown in Table 1.

Embodiment 3

[0019] according to figure 1 As shown, the catalytic distillation tower operates under normal pressure, the number of theoretical plates in the stripping section is 5, the separation efficiency of the catalytic reaction section is equivalent to 5 theoretical plates, and the catalyst is SiO 2 / TiO 2 Titanium-silicon molecular sieve with a mol ratio of 20, 2% by weight of hydrogen peroxide and ethyl acetate mixture (50% by weight of ethyl acetate content) enters the first theoretical plate with a flow of 1 g / min, and allyl chloride flows from the first theoretical plate with a flow of 5 g / min The bottom of the catalytic reaction section enters, the temperature of the catalytic reaction section is 42-46°C, and the bottom of the tower is withdrawn at a flow rate of 6 g / min. It has been operated stably for 1000 hours. The catalytic distillation results are shown in Table 1.

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Abstract

Relating to a production method of epichlorohydrin, the invention mainly provides a solution to problems of uneasy control of reaction temperature, low conversion rate and poor selectivity existing in producing epichlorohydrin by direct epoxidation of chloropropene. In the invention, chloropropene, hydrogen peroxide and a solvent are subjected to an epoxidation reaction in a catalytic distillation column, with component separation as an accompaniment. Steam in the overhead of the column reflows after condensation, and part of materials at the column bottom return to the catalytic distillation column after vaporization by a reboiler, with the rest taken as produced liquid. The technical scheme that the mixture of hydrogen peroxide and the solvent enters the column from the overhead while chloropropene can enter from any position between a stripping section and the overhead provides a good solution to the above problems. Thus, the method can be applied to the industrial production of epichlorohydrin.

Description

technical field [0001] The present invention relates to a method for producing epichlorohydrin. 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, high energy consumption, se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/08C07D301/12
CPCY02P20/10
Inventor 钟禄平高焕新肖剑
Owner CHINA PETROLEUM & CHEM CORP
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