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A method for preparing haloethanol and ethylene oxide

A haloethanol and halohydrin technology, which is applied in the field of preparation of haloethanol, can solve the problems of wasting raw materials, generating dichloroethane, polluting the environment, etc., and achieves the effects of lightening the load and reducing the amount of steam used.

Active Publication Date: 2019-09-06
JIANGXI SUKEER NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The preparation of ethylene oxide by the chlorohydrin method of the prior art mainly has the following problems: 1. raw material chlorine and ethylene undergo an addition side reaction to generate ethylene dichloride
Dichloroethane is difficult to utilize and wastes a lot of raw materials
In addition, chlorine gas reacts with ethylene to release 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 keeps rising, and the reaction releases heat. Oxygen, chlorine, and ethylene 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 consumption of water resources is large, and a large amount of waste water and waste residues are produced. The production of 1 ton of ethylene oxide by the chlorohydrin method produces 40-50 tons of chloride-containing waste water and 2.1 tons of calcium chloride waste. The "five high" characteristics of high content, high COD content and high suspended matter 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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  • A method for preparing haloethanol and ethylene oxide
  • A method for preparing haloethanol and ethylene oxide
  • A method for preparing haloethanol and ethylene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] 1) Haloalcoholization: Add 70wt% concentration of hydrogen peroxide H 2 o 2 , HCl solution (hydrochloric acid) of 35wt% concentration, after 10min, add ethylene, carry out chloroalcoholization reaction at the temperature of 45 ℃, wherein the hydrogen peroxide H of 70wt% concentration 2 o 2 , 35wt% concentration of HCl solution and ethylene flow should make H 2 o 2 The molar ratio of HCl to ethylene is about 1.2:1.2:1. This gives the halohydrin, a mixture of 2-chloroethan-1-ol and 1-chloroethan-2-ol. Wherein, the synthesis method of TS-1 refers to Example 1 of CN201410812216.8.

Embodiment 2

[0098] 1) Haloalcoholization: add TS-1 molecular sieve, 70wt% concentration of hydrogen peroxide H in the tower reactor 2 o 2 , HCl solution (hydrochloric acid) of 35wt% concentration, after 10min, add ethylene, carry out chloroalcoholization reaction at the temperature of 45 ℃, wherein the mass ratio of TS-1 molecular sieve and ethylene is 0.05:1, the hydrogen peroxide H of 70wt% concentration 2 o 2 , 35wt% concentration of HCl solution and the addition of ethylene should make H 2 o 2 The molar ratio of HCl to ethylene is about 1.5:1.1:1. This gives the halohydrin, a mixture of 2-chloroethan-1-ol and 1-chloroethan-2-ol. Wherein, the synthesis method of TS-1 refers to Example 1 of CN201410812216.8.

Embodiment 3

[0106] 1) Haloalcoholization: Add 70wt% concentration of hydrogen peroxide H 2 o 2 , HCl solution (hydrochloric acid) of 35wt% concentration, after 10min, add ethylene, carry out chloroalcoholization reaction at the temperature of 45 ℃, wherein the hydrogen peroxide H of 70wt% concentration 2 o 2 , 35wt% concentration of HCl solution and ethylene flow should make H 2 o 2 The molar ratio of HCl to ethylene is about 1.2:1.2:1. This gives the halohydrin, a mixture of 2-chloroethan-1-ol and 1-chloroethan-2-ol. Wherein, the synthesis method of TS-1 refers to Example 1 of CN201410812216.8.

[0107] 2) Saponification: performing saponification reaction with the halohydrin obtained in step 1) and sodium hydroxide, and separating to obtain an ethylene oxide organic phase and a 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 th...

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Abstract

The invention provides a method for preparing halohydrin. The method comprises the following steps: 1) halogen alcoholization: halogen hydride, H2O2, and a catalyst are added in a reaction apparatus, and ethylene is added for a halogen alcoholization reaction to obtain halohydrin. The invention also provides a method for preparing ethylene oxide by a halogen alcoholization method, which comprises the step 1) in right claim 1, the method also comprises a step of 2) saponification: halohydrin in the step 1) and hydroxide of alkali metal are subjected to a saponification reaction, then separated to obtain ethylene oxide and alkali halide metal salt; and an optional step of 3) electrodialysis: the obtained alkali halide metal salt is subjected to bipolar membrane electrodialysis to obtain the hydroxide of alkali metal and the halogen hydride. The method is used for preparing halohydrin or ethylene oxide with high selectivity and yield, and greatly reduces the discharge of waste water and waste residue.

Description

technical field [0001] The invention relates to a preparation method of haloethanol, and a method for preparing ethylene oxide from haloethanol; more specifically, it provides a method for preparing haloethanol by using ethylene as a raw material and adopting a new haloalcohol method, and a method for preparing haloethanol by using a new haloalcohol method. Ethylene oxide method. Background technique [0002] 2-Chloroethanol (also called "chloroethane") is an important organic solvent and raw material for organic synthesis. It is used in the manufacture of ethylene oxide, synthetic rubber, dyes, medicines and pesticides, and is also used as an organic solvent. Used in the manufacture of ethylene glycol, ethylene oxide, and the synthesis of medicines, dyes, and pesticides. [0003] Ethylene oxide (hereinafter referred to as "EO") is an important organic chemical raw material. It is an organic compound with the chemical formula C2H4O, a toxic carcinogen that was previously ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/36C07C29/64C07D303/04C07D301/26C02F1/469
Inventor 林民廖维林舒兴田
Owner JIANGXI SUKEER NEW MATERIAL
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