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Technology for preparing epoxypropane from propylene chlorohydrin through single acid process

A technology of propylene chlorohydrin and propylene oxide, applied in organic chemistry and other directions, can solve the problems of difficult treatment of saponification wastewater, increased total product cost, narrowed profit margins, etc., and achieves the effect of easy treatment

Active Publication Date: 2017-07-18
吴剑华
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the product cost of this method is low, the saponification wastewater is difficult to treat, which has become a bottleneck restricting the production of this method
At present, the production of propylene oxide in our country is in a dilemma. Closing down the chlorohydrin method propylene oxide manufacturers that are not qualified for environmental protection will not guarantee the balance of chlorine in the chlor-alkali industry in a short period of time; if the environmental protection treatment of saponification wastewater is qualified, the total cost of the product will increase. , shrinking profit margins, making it difficult for enterprises to survive

Method used

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  • Technology for preparing epoxypropane from propylene chlorohydrin through single acid process
  • Technology for preparing epoxypropane from propylene chlorohydrin through single acid process

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The propylene oxide production process of the single-acid method of propylene chlorohydrinization in Example 1 comprises a hypochlorous acid reaction unit (1), a dehydrochlorination reaction unit (2), a propylene chlorohydrinization reaction unit (3), a saponification reaction rectification unit (4 ) and saponification liquid sedimentation separation unit (5); the saponification agent used is calcium hydroxide slurry, and the operation process is: the raw material chlorine gas and water enter the hypochlorous acid reaction unit (1) and react to generate hypochlorous acid and hydrogen chloride; The hypochlorous acid and hydrogen chloride aqueous solution and calcium carbonate in the acid reaction unit (1) enter the dehydrochlorination reaction unit (2), in which the calcium carbonate reacts with hydrogen chloride to generate calcium chloride, water and carbon dioxide; into the solid residue discharge system; the dehydrochlorination liquid phase material exiting the dehydr...

Embodiment 2

[0037] Embodiment 2 is substantially the same as Embodiment 1, except that the saponification agent used is sodium hydroxide solution.

Embodiment 3

[0039] Example 3 is basically the same as Example 1, except that a saponification raffinate decalcification unit (6) is added after the saponification liquid sedimentation separation unit (5), and the saponification raffinate decalcification unit (6) Sodium carbonate is added to produce saponification solution. The saponification raffinate in the sedimentation separation unit (5) reacts with sodium carbonate in the saponification raffinate decalcification unit (6) to form sodium chloride and calcium carbonate precipitates, and the calcium carbonate circulates into the dehydrochlorination reaction. Unit (2); the liquid phase of the saponification raffinate decalcification unit (6) is sodium chloride solution. The technological process diagram of embodiment 3 sees figure 2 .

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Abstract

The invention provides a technology for preparing epoxypropane from propylene chlorohydrin through a single acid process. According to the invention, firstly, chlorine reacts with water so as to generate hypochlorous acid and hydrogen chloride, and hydrogen chloride is removed with calcium carbonate before the propylene chlorohydrin reaction, so that chlorine and propylene are prevented from coming into contact with each other to generate propylene dichloride and chloropropanol and hydrogen chloride are prevented from coming into contact with each other to generate propylene dichloride. Propylene and chlorine are added. According to the invention, the yield of epoxypropane can be obviously increased. According to the invention, only epoxypropane is distilled in a saponification distillation process, the operation of steam stripping for propylene dichloride is not required and the energy consumption can be obviously reduced. Calcium chloride in saponification wastewater is converted into sodium chloride and calcium carbonate under the effect of sodium carbonate; the calcium carbonate is reused for removing hydrogen chloride generated from hypochlorous acid reaction or preparing calcium carbonate commodity; the saponification wastewater containing sodium chloride is used for electrolysis alkali preparation or evaporation concentration and membrane separation concentration so as to acquire industrial sodium chloride.

Description

[0001] Technical field: [0002] The invention relates to a production process of chemical products, in particular to a production process of organic chemical product propylene oxide. [0003] Background technique: [0004] Propylene oxide is an important organic chemical product. It is the third largest derivative after polypropylene and acrylonitrile in the series of propylene products. It is also a product for balancing chlorine in the chlor-alkali industry. [0005] At present, the production processes of propylene oxide that have been industrialized at home and abroad mainly include chlorohydrin method, co-oxidation method and hydrogen peroxide direct oxidation method (HPPO). Among them, the hydrogen peroxide direct oxidation method has low raw material cost, only propylene oxide and water are produced in the production process, and there are no other co-products. The process is simple, the product yield is high, and it is basically pollution-free. It is an environmentally...

Claims

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Application Information

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IPC IPC(8): C07D301/26C07D303/04
Inventor 吴剑华
Owner 吴剑华
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