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Production method and system for epichlorohydrin

A technology for epichlorohydrin and production methods, applied in chemical instruments and methods, organic chemistry, membrane technology, etc., can solve the problems of increased energy consumption and high cost of separation, achieve reduced separation costs, lower production costs, and simple operation methods Effect

Active Publication Date: 2019-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, due to the catalyst and H 2 o 2 The cost is high, and the reaction process requires the use of solvents, which increases the energy consumption of the separation

Method used

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  • Production method and system for epichlorohydrin
  • Production method and system for epichlorohydrin
  • Production method and system for epichlorohydrin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] The bipolar membrane used in this example is a homogeneous bipolar membrane (model BP-1) purchased from Hebei Guangya Company, and the anion exchange membrane is an anion exchange membrane (model AHA) purchased from Japan Yastom Company.

[0095] This embodiment adopts image 3 The production system shown (but no rectification tower is set, and no clapboard is set in the effluent settlement tank of the alkali chamber) performs bipolar membrane electrodialysis in a batch manner, and the bipolar membrane electrodialyzer adopted is a two-chamber bipolar membrane Electrodialyzer, its membrane unit such as figure 1 As shown, the bipolar membrane electrodialyzer has 10 membrane units.

[0096] (1) 2000g of an aqueous solution containing dichloropropanol as a raw material (the aqueous solution containing dichloropropanol contains dichloropropanol and sodium chloride, wherein the content of dichloropropanol is 20% by weight, and the content of sodium chloride content is 10% b...

Embodiment 2

[0101] The bipolar membrane electrodialysis was carried out in the same manner as in Example 1 to prepare epichlorohydrin, except that the content of sodium chloride in the aqueous solution containing dichloropropanol as a raw material was 20% by weight.

[0102] After the bipolar membrane electrodialysis is completed, the aqueous phase and the organic phase of the alkali chamber effluent are analyzed by gas chromatography. It is determined through calculation that the conversion rate of dichloropropanol is 99%, and the selectivity of epichlorohydrin is 85%.

Embodiment 3

[0104] The same method as in Example 1 was used to carry out bipolar membrane electrodialysis to prepare epichlorohydrin, except that in the aqueous solution containing dichloropropanol as a raw material, the concentration of sodium chloride was 25% by weight.

[0105] After the bipolar membrane electrodialysis is completed, the aqueous phase and the organic phase of the alkali chamber effluent are analyzed by gas chromatography. It is determined through calculation that the conversion rate of dichloropropanol is 99%, and the selectivity of epichlorohydrin is 87%.

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Abstract

The invention discloses a production method for epichlorohydrin. The method comprises the following steps: sending an aqueous solution containing dichloropropanol into an alkali chamber of a bipolar membrane electrodialyser, and performing bipolar membrane electrodialysis to obtain an alkali chamber effluent liquid containing the epichlorohydrin. The invention also discloses a production system for the epichlorohydrin. According to the production method provided by the invention, waste water and waste residues are not produced or substantially not produced, and the method is green and environmentally friendly; a catalyst is not used, and the production costs are reduced; and according to the method provided by the invention, the low separation costs are low, and the operation method is simple.

Description

technical field [0001] The invention relates to a production method of epichlorohydrin, and also relates to a production system of epichlorohydrin. Background technique [0002] Epichlorohydrin is an important basic organic chemical raw material and intermediate, widely used in the synthesis of various products such as epoxy resin, glycerin, chlorohydrin rubber, pharmaceuticals, pesticides, surfactants, and plasticizers. [0003] At present, the process commonly used in my country's industry is the high-temperature chlorination of propylene, including the high-temperature chlorination of propylene to prepare allyl chloride, the hypochlorination of propylene chloride to generate dichloropropanol, and the saponification of dichloropropanol to prepare epichlorohydrin. After rectification and other processes, the product epichlorohydrin is obtained. The advantage of this method is that the production process is flexible, the process is mature, and the operation is stable. The di...

Claims

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Application Information

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IPC IPC(8): C07D303/08C07D301/26B01D61/44
Inventor 罗一斌刘中清周丽娜满征彭欣欣舒兴田
Owner CHINA PETROLEUM & CHEM CORP