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Hydrogen chloride-free chlorohydrination process epoxide preparation method for carbon dioxide recovery

A hydrogen chloride, chlorohydrin, and carbon dioxide technology, which is applied in the preparation of bicarbonate, alkali metal chloride, organic chemistry, 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, and achieve production Large capacity, ensuring long-term stable operation, no scaling and blocking effects

Inactive Publication Date: 2020-10-02
吴剑华
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  • Abstract
  • Description
  • 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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  • Hydrogen chloride-free chlorohydrination process epoxide preparation method for carbon dioxide recovery

Examples

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Embodiment 1

[0025] The hydrogen chloride-free chlorohydrin method epoxide preparation method of carbon dioxide recovery in this embodiment 1 includes a hypochlorous acid preparation unit 1, a carbon dioxide recovery unit 2, a chloroalcoholization reaction unit 3, a saponification reaction unit 4, the aforementioned units and an electrolytic alkali production unit Used in conjunction, the specific preparation methods include:

[0026] a. Chlorine, water and sodium bicarbonate from the electrolytic soda production unit enter hypochlorous acid preparation unit 1, in which water and chlorine react to generate hypochlorous acid and hydrogen chloride, and sodium bicarbonate and hydrogen chloride react to generate sodium chloride and carbon dioxide ;

[0027] B. go out the carbon dioxide of hypochlorous acid preparation unit 1 and sodium carbonate aqueous solution and enter carbon dioxide recovery unit 2, in this unit, carbon dioxide and sodium carbonate aqueous solution react to generate sodium...

Embodiment 2

[0031] Embodiment 2 is basically the same as Example 1, except that the raw material to be chloroalcoholized is allyl chloride, which reacts with hypochlorous acid to generate dichloropropanol, which reacts with sodium hydroxide to form the target The product epichlorohydrin.

Embodiment 3

[0033] Example 3 is basically the same as Example 1, except that the mixed solution of hypochlorous acid and sodium chloride from the hypochlorous acid preparation unit 1 is evaporated and then enters the chloroalcoholation reaction unit 3 with the raw material propylene to be chloroalcoholized.

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Abstract

The invention provides a hydrogen chloride-free chlorohydrination process epoxide preparation method for carbon dioxide recovery. The method comprises the following steps: preparing a hydrogen chloride-free high-concentration hypochlorous acid solution from chlorine, water and sodium bicarbonate; reacting the associated carbon dioxide with sodium carbonate and water to generate sodium bicarbonatefor preparing hypochlorous acid circularly; performing the chlorohydrination reaction on the hypochlorous acid without hydrogen chloride and a raw material to be chlorated to obtain high-concentrationchlorohydrins without generation of byproducts, so that saponification is conducted through sodium hydroxide, and a target product epoxide is obtained; and electrolyzing the saponification liquid containing NaCl to produce alkali. The method is matched with an electrolytic alkali making device for use, no wastewater, waste residues and waste gas are generated in the production process, the numberof 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 preparation method of a class of chemical products, in particular to a method for preparing epoxides by a hydrogen chloride-free chlorohydrin method for recovering carbon dioxide. 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 prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D303/04C07D303/08C07D303/48C07D301/26C01D3/04C01D7/10
CPCC07D303/04C07D303/08C07D303/48C07D301/26C01D3/04C01D7/10
Inventor 吴剑华
Owner 吴剑华
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