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Chlorohydrination process epoxide production method for dehydrochlorination of circulating calcium carbonate

An epoxide and dehydrochlorination technology, applied in the fields of organic chemistry, introduction of hydroxyl and halogen preparation, etc., can solve the problems of rising production costs, inability to ensure the balance of chlorine gas in the chlor-alkali industry, and difficulty in the survival of enterprises. Ensure long-term stable operation, raw material route design and intermediate product utilization with advanced and reasonable effects

Inactive Publication Date: 2020-10-02
吴剑华
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  • Claims
  • Application Information

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Problems solved by technology

Closing down unqualified chlorohydrin-based epoxide production units and adopting non-chlorohydrin-based epoxide production will not be able to guarantee the chlorine gas balance in the chlor-alkali industry in a short period of time; let the traditional chlorohydrin-based epoxide production enterprises guarantee saponification wastewater and If the environmental protection treatment of waste residue is qualified, the production cost of the product will increase, and it will be difficult for the enterprise to survive

Method used

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  • Chlorohydrination process epoxide production method for dehydrochlorination of circulating calcium carbonate

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Effect test

Embodiment 1

[0028] The chlorohydrin method epoxide production method of circulating calcium carbonate dehydrochlorination of the present embodiment comprises hypochlorous acid reaction unit 1, chloroalcoholization reaction unit 2, saponification reaction unit 3, epoxide separation unit 4, carbon dioxide recovery unit 5, Calcium carbonate separation unit 6, the specific process is:

[0029] a. Chlorine, water and calcium carbonate from the electrolytic soda plant enter the hypochlorous acid reaction unit 1, in this unit, water and chlorine react to generate hypochlorous acid and hydrogen chloride, and calcium carbonate and hydrogen chloride react to generate calcium chloride, water and carbon dioxide;

[0030] b. The aqueous solution of hypochlorous acid after hydrogen chloride removal from the hydrogen chloride reaction unit 1 enters the chloroalcoholization reaction unit 2 with propylene, and in this unit, propylene reacts with hypochlorous acid to generate the intermediate product chlo...

Embodiment 2

[0036] Embodiment 2 is basically the same as Example 1, except that the raw material to be chloroalcoholized is allyl chloride, and the raw material to be chloroalcoholized is propylene and hypochlorous acid to react to generate the intermediate product dichloropropanol, which reacts with sodium hydroxide to form The target product is epichlorohydrin.

Embodiment 3

[0038] Example 3 is basically the same as Example 1, except that the hypochlorous acid solution leaving the hypochlorous acid reaction unit 1 enters the chloroalcoholation reaction unit 2 after being concentrated.

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Abstract

The invention provides a chlorohydrination process epoxide production method for circulating calcium carbonate dehydrochlorination. The method comprises the following steps: preparing hydrogen chloride-free hypochlorous acid from chlorine from an electrolytic alkali production device, water and calcium carbonate; carrying out chlorohydrination reaction by adopting hypochlorous acid without hydrogen chloride; carrying out saponification reaction by adopting sodium hydroxide from an electrolytic alkali making device; recovering carbon dioxide generated by dehydrochlorination of the hypochlorousacid solution by using calcium hydroxide contained in the saponification solution, thus generating calcium carbonate; recycling the obtained calcium carbonate for dehydrochlorination of the hypochlorous acid solution; and finally, feeding the saponification liquid sodium chloride aqueous solution to an electrolysis alkali-making device. The method is used in cooperation with an electrolytic alkalimaking device, no waste water or waste residues or by-products exist in the production process, the number of target products is large, economic benefits and environmental benefits are remarkable, and a traditional chlorohydrination epoxide production technology can be replaced.

Description

technical field [0001] The invention relates to a production method of a class of chemical products, in particular to a chlorohydrin method epoxide production method of circulating calcium carbonate dehydrochlorination. Background technique [0002] Chlorohydrin method epoxide is an important product for chlorine gas balance in my country's chlor-alkali industry. The traditional chlorohydrin method of epoxide production has a long history and mature technology, and is the most widely used epoxide production method in the world and in my country. However, the traditional chlorohydrin method for epoxide production is backward in technology, with by-products and high raw material and energy consumption. In particular, the traditional chlorohydrin method of epoxide production produces a large amount of saponification wastewater and waste residue, which is difficult to meet the national environmental protection requirements. [0003] At present, the environmental protection pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D301/26C07D303/04C07D303/08C07C29/66C07C31/36
CPCC07D301/26C07D303/04C07D303/08C07C29/66
Inventor 吴剑华
Owner 吴剑华
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