Methods for preparing halogen ethanol and ethylene oxide

A technology of ethylene oxide and haloethanol, which is applied in the fields of preparing ethylene oxide by using a new halohydrin method, preparing haloethanol, and preparing ethylene oxide, can solve the problem of large consumption of water resources, high COD of waste water, and dangerous production. big problem

Active Publication Date: 2017-03-22
JIANGXI SUKEER NEW MATERIAL
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  • Abstract
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  • Claims
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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 con

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  • Methods for preparing halogen ethanol and ethylene oxide
  • Methods for preparing halogen ethanol and ethylene oxide
  • Methods for preparing halogen ethanol and ethylene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111] 1) Catalyst acid treatment: soak the TS-1 molecular sieve in hydrochloric acid with a mass fraction of 36% for 1 hour, then wash the catalyst with distilled water, and dry the catalyst for 6 hours at 40°C;

[0112] 2) Haloalcoholization: Add 70wt% concentration of hydrogen peroxide H 2 o 2 , HCl solution (hydrochloric acid) and ethene of 35wt% concentration, 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.

Embodiment 2

[0117] 1) Catalyst acid treatment: soak TS-1 molecular sieve in hydrochloric acid with a mass fraction of 25% for 2 hours, then wash the catalyst with distilled water, and dry the catalyst for 2 hours at 40°C; among them, the synthesis of TS-1 The method refers to Example 1 of CN201410812216.8.

[0118] 2) Haloalcoholization: add TS-1 molecular sieve, 35wt% concentration of hydrogen peroxide H in the tower reactor 2 o 2 , HCl solution (hydrochloric acid) and ethylene of 20wt% concentration, carry out chlorohydrinization reaction at the temperature of 35 ℃, wherein the mass ratio of TS-1 molecular sieve and ethylene is 0.05:1, the hydrogen peroxide H of 35wt% concentration 2 o 2 , 20wt% concentration of HCl solution and ethylene should be added in such a way that 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.

Embodiment 3

[0130] 1) Catalyst acid treatment: Soak TS-1 molecular sieve in hydrochloric acid with a mass fraction of 36% for 1 hour, then wash the catalyst with distilled water, and dry the catalyst for 6 hours at 40°C; among them, the synthesis of TS-1 The method refers to Example 1 of CN201410812216.8.

[0131] 2) Haloalcoholization: Add 70wt% concentration of hydrogen peroxide H 2 o 2 , HCl solution (hydrochloric acid) and ethene of 35wt% concentration, 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.

[0132] 3) Saponification: saponifying the haloalcohol obtained in step 2) with sodium hydroxide, and separating to obtain an ethylene oxide organic phase and a sodium chloride solution. The...

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Abstract

The invention provides a method for preparing halogen ethanol, wherein the method comprises: (1) acid treatment of a catalyst, wherein a catalyst is soaked in an acid, the soaked catalyst is washed, and the washed catalyst is dried; (2) halogen alcoholization, wherein hydrogen halide, H2O2, ethylene and the catalyst treated in the step (1) are added to a reaction device, and a halogen alcoholization reaction is performed to obtain the halogen ethanol; optionally (3) saponification, wherein the halogen ethanol obtained in the step (2) and the hydroxide of an alkali metal are subjected to a saponifying reaction, and separation is performed to obtain ethylene oxide and a halogenated alkali metal salt; and optionally, (4) electrodialysis, wherein the halogenated alkali metal salt obtained in the step (3) is subjected to bipolar membrane electrodialysis to obtain the hydroxide of the alkali metal and the hydrogen halide. According to the present invention, the halogen ethanol is prepared in the forms of the extremely high yield and the extremely high selectivity, and the emission of wastewater and waste residue is substantially reduced.

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