Method for preparing halogenohydrin and epoxide

An epoxide and hydroxide technology, applied in chemical instruments and methods, separation methods, introduction of hydroxyl and halogen preparations, etc., can solve the problems of dangerous production, environmental pollution, easy to cause explosions, etc.

Active Publication Date: 2017-03-22
JIANGXI SUKEER NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The preparation of epoxides by the chlorohydrin method of the prior art mainly has the following problems: 1. raw material chlorine and olefins undergo addition side reactions to generate dichloroalkanes
Dichloropropane is difficult to utilize and wastes a lot of raw materials
In addition, chlorine gas reacts with olefins, releasing a large amount of heat, which is concentrated in the reaction vessel, resulting in great production hazards.
②A small amount of oxygen is inevitably entrained in the raw material chlorine gas during the production process. As the reaction proceeds, chlorine gas continuously participates in the reaction, so chlorine gas needs to be continuously replenished, while oxygen cannot participate in the reaction and accumulates in the reaction device continuously. , the oxygen concentration continues to rise, and the reaction releases heat. Oxygen, chlorine, and olefins exist at the same time, and it is easy to cause an explosion at high temperature.
④The reaction produces a large amount of calcium chloride, which leads to high COD of wastewater and pollutes the environment
⑤ The disadvantage of the chlorohydrin method is that it consumes a lot of water resources and produces a large amount of waste water and waste residue. The chlorohydrin method produces 1t of epoxides and produces 40-50t of chloride-containing waste water and 2.1t of calcium chloride waste residue. The waste water has high temperature and pH The "five highs" characteristics of high value, high chlorine content, high COD content and high suspended solids content are difficult to handle and seriously pollute the environment
⑥ The hypochlorous acid produced in the production process also seriously corrodes the equipment

Method used

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  • Method for preparing halogenohydrin and epoxide
  • Method for preparing halogenohydrin and epoxide
  • Method for preparing halogenohydrin and epoxide

Examples

Experimental program
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Effect test

Embodiment A

[0100] 1) Haloalcoholization: add water, chlorine (Cl 2 ) and propylene, carry out chloroalcoholization reaction at a temperature of 45°C, and the residence time in the tubular reactor is 30 minutes, wherein chlorine (Cl 2 ) and propylene flow should be such that liquid chlorine (Cl 2 ) to propylene in a molar ratio of 3.4:1, and the amount of water introduced is 99 times the mass of propylene. This gives the halohydrin, a mixture of 2-chloropropan-1-ol and 1-chloropropan-2-ol. Wherein the halohydrin contains 9wt% halogenated hydrocarbon by-products.

[0101] 2) Saponification: performing saponification reaction with the haloalcohol obtained in step 1) and sodium hydroxide, and separating to obtain the propylene oxide organic phase and sodium chloride solution. The saponification reaction is carried out in a steel tower reactor, and the upper part is designed as a sieve tray tower. Steam enters from the bottom of the tower to blow out the crude propylene oxide generated fr...

Embodiment 1

[0108] 1) Haloalcoholization: Add 70wt% concentration of hydrogen peroxide H 2 o 2 , HCl solution (hydrochloric acid) and propylene of 35wt% concentration, carry out chlorohydrinization reaction at the temperature of 45 ℃, wherein the hydrogen peroxide H of 70wt% concentration 2 o 2 , 35wt% concentration of HCl solution and propylene three flow should make H 2 o 2 The molar ratio of HCl to propylene is about 1.2:1.2:1. This gives the halohydrin, a mixture of 2-chloropropan-1-ol and 1-chloropropan-2-ol.

Embodiment 2

[0112] 1) Haloalcoholization: add tungstic acid catalyst, 35wt% concentration of hydrogen peroxide H in the tower reactor 2 o 2 , HCl solution (hydrochloric acid) and propylene of 20wt% concentration, carry out chlorohydrinization reaction at the temperature of 35 ℃, wherein the mass ratio of tungstic acid catalyst and propylene is 0.05:1, the hydrogen peroxide H of 35wt% concentration 2 o 2 , the addition amount of HCl solution of 20wt% concentration and propylene should make H 2 o 2 The molar ratio of HCl to propylene is about 1.5:1.1:1. This gives the halohydrin, a mixture of 2-chloropropan-1-ol and 1-chloropropan-2-ol.

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Abstract

The invention discloses a method for preparing epoxide with a halogenohydrin method. The method comprises the following steps: (1) halogen alcoholization: adding H2O, halogen elementary substances and olefin compounds into a reaction device, and reacting to obtain halogenohydrin; (2) saponification: carrying out saponification on the halogenohydrin by a hydroxide of alkali metal to obtain the epoxide and alkali halide metal salt; (3) carrying out bipolar membrane electroosmosis on the alkali halide metal salt to obtain the hydroxide of alkali metal and halogen hydride. The invention also provides a method for preparing epoxide with the halogenohydrin method. The method comprises the following steps: (1) halogen alcoholization: carrying out halogen alcoholization reaction on the halogen hydride, H2O2 and olefin compounds to obtain halogenohydrin; optionally (2) saponification: carrying out saponification reaction on the halogenohydrin by a hydroxide of alkali metal to obtain the epoxide and alkali halide metal salt; optionally (3) carrying out bipolar membrane electroosmosis on the alkali halide metal salt to obtain the hydroxide of alkali metal and halogen hydride. According to the methods, the halogenohydrin or the epoxide can be prepared at extremely high selectivity and yield, and the discharging of waste water and waste residues can be drastically lowered.

Description

technical field [0001] The present invention relates to a method for preparing halohydrin, and a method for preparing epoxide from halohydrin; more specifically, it provides a method for preparing halohydrin by using olefin as a raw material, and a method for preparing epoxide by using a new alcohol method Methods. Background technique [0002] Epoxides contain epoxy groups, are chemically active, and are easy to ring-opening polymerization. They are important organic chemical raw materials. For example, propylene oxide, as the third largest derivative of propylene series, is most widely used in the preparation of polyether polyols, as well as in the production of propylene glycol and nonionic surfactants. In recent years, PO is also widely used in the synthesis of green products such as dimethyl carbonate and carbon dioxide polymer. [0003] Propylene oxide production The main industrial methods for producing propylene oxide are chloroalcoholization and co-oxidation, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/36C07C29/64C07D303/04C07D301/26C02F1/469C02F101/12
CPCC02F1/4693C02F2101/12C07C29/64C07D301/26C07D303/04C07C31/36C02F2103/36C02F2201/46115C07D301/27C07D301/32C07C31/34
Inventor 舒兴田林民廖维林
Owner JIANGXI SUKEER NEW MATERIAL
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