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Production method of epoxide through dual-alkali chlorohydrination method

A technology of epoxides and production methods, which is applied in the direction of products, educts, organic chemistry, etc., can solve the problems of rising total product costs, inability to ensure the balance of chlor-alkali and chlorine gas, and difficulties in the survival of enterprises, so as to achieve less saponification wastewater and easy environmental protection Treatment and resource utilization to ensure the effect of long-term stable operation

Inactive Publication Date: 2018-08-24
吴剑华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the environmental protection problem of chlorohydrin method epoxide production has become a bottleneck restricting the production of this method, and is now in a dilemma. If unqualified epoxide manufacturers are shut down, the chlorine gas balance in the chlor-alkali industry cannot be guaranteed in a short period of time; Ensuring that the saponification wastewater is treated in an environmentally friendly manner will increase the total cost of the product and make it difficult for the enterprise to survive

Method used

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  • Production method of epoxide through dual-alkali chlorohydrination method

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Embodiment 1

[0029] A kind of production method of double alkali chlorhydrin method epoxide, described method is provided with hypochlorous acid reaction unit 1, dehydrochlorination reaction unit 2, chloroalcoholization reaction unit 3, saponification reaction unit 4, epoxide separation unit 5, saponification Raffinate separation unit 6, carbon dioxide recovery unit 7. The process is:

[0030] a. raw material chlorine and water enter hypochlorous acid reaction unit 1 and react to generate hypochlorous acid and hydrogen chloride;

[0031] B. go out the hypochlorous acid of hydrogen chloride reaction unit 1 and hydrogen chloride mixed solution and calcium carbonate enter dehydrochlorination reaction unit 2, calcium carbonate and hydrogen chloride reaction generate calcium chloride, water and carbon dioxide in this unit;

[0032] c. The hydrogen chloride-free hypochlorous acid aqueous solution going out of the dehydrochlorination reaction unit 2 and the chloroalcoholization raw material prop...

Embodiment 2

[0039] Embodiment 2 is substantially the same as Embodiment 1, except that the hypochlorous acid reaction unit 1 and the dehydrochlorination reaction unit are combined, and water, chlorine, and calcium carbonate enter the same reaction unit. The process flow diagram of this embodiment is shown in figure 2 .

Embodiment 3

[0041] Example 3 is basically the same as Example 1, except that the raw material to be chlorohydrinated into the chlorohydrination reaction unit 3 is ethylene, and the target product obtained by the epoxide separation unit 5 is ethylene oxide.

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Abstract

The invention provides a production method of epoxide through a dual-alkali chlorohydrination method. According to the preparation method, hydrogen chloride produced in a process of dehydrating calcium carbonate and reacting with chlorine gas to generate hypochlorous acid; high-concentration hypochlorous acid without the hydrogen chloride is used for carrying out chlorohydrination reaction; then sodium hydroxide is used for carrying out saponification reaction, and carbon dioxide produced in a process of removing the hydrogen chloride is recycled by utilizing calcium hydroxide slurry. According to the method provided by the invention, a few of byproducts are generated in a chlorohydrination process and raw materials to be subjected to chlorohydrination are transformed into more target products; in a saponification process, no waste dreg is generated and a saponification tower is not blocked; less residual water is generated in a saponification reaction process; the saponification residual water has a simple composition, and environment-friendly treatment and resource utilization are easy to realize; materials without the hydrogen chloride have light corrosion on equipment; calciumhydroxide and the calcium carbonate, which are generated in a system, can be cyclically utilized; the epoxide produced by the method provided by the invention has remarkable economic benefits and environmental benefits.

Description

technical field [0001] The invention relates to a production method of a class of chemical products, in particular to a production method for preparing epoxides by a chlorohydrin method. Background technique [0002] Epoxides are a class of organic compounds with a three-membered cyclic ether structure, such as ethylene oxide, propylene oxide, butylene oxide, epichloroethylene, and epichlorohydrin. Epoxides are widely used, such as ethylene oxide can be used to manufacture various solvents, diluents, non-ionic surfactants, synthetic detergents, antifreeze agents, disinfectants, emulsifiers, etc., and are widely used in pharmaceutical, printing and dyeing industries ; Propylene oxide is the third largest propylene derivative after polypropylene and acrylonitrile, used in the production of polyether polyols, propylene glycol and various nonionic surfactants; both ethylene oxide and propylene oxide are available Used in the production of new solvent dimethyl carbonate; epichlo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D303/08C07D301/32C07D301/26
CPCC07D301/26C07D301/32C07D303/04C07D303/08Y02P20/141
Inventor 吴剑华
Owner 吴剑华
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