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Method for preparing halohydrin and ethylene oxide through dry gas

A technology of ethylene oxide and haloethanol, which is applied in the field of preparation of haloethanol and the preparation of ethylene oxide by the new alcohol method, which can solve the problems of large consumption of water resources, high COD of wastewater, and environmental pollution

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

AI Technical Summary

Problems solved by technology

[0006] The chlorohydrin method of prior art prepares epoxide mainly to have the following problems: 1. 1. chlorine gas passes into water, and reaction is extremely slow and solubility is very little, and the reaction of chlorine gas and water is reversible reaction, causes the hypochlorous acid ratio that reaction generates is very little, As a result, the yield of the haloalcoholation reaction is very low, generally only 3-4%
③The reaction produces a large amount of calcium chloride, which leads to high COD of wastewater and pollutes the environment
④The 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 production of 1t of epoxide by the chlorohydrin method 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
However, such methods have the inherent problems of the chlorohydrin method

Method used

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  • Method for preparing halohydrin and ethylene oxide through dry gas
  • Method for preparing halohydrin and ethylene oxide through dry gas
  • Method for preparing halohydrin and ethylene oxide through dry gas

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Embodiment 1

[0099] A method for preparing haloethanol from dry gas, the method may further comprise the steps:

[0100] (1) Haloalcoholization: Add 70wt% concentration of hydrogen peroxide H 2 o 2 , chlorine and dry gas (the volume content of ethylene is 33.7vol%), carry out chlorohydrinization reaction at the temperature of 45 ℃, wherein the hydrogen peroxide H of 70wt% concentration 2 o 2 The flow rates of , chlorine and dry gas should make H 2 o 2 The volume ratio of chlorine to dry gas is about 1.1:0.5:1. Chlorohydrin is obtained.

Embodiment 2

[0105] A method for preparing haloethanol from dry gas, the method may further comprise the steps:

[0106] 1) Haloalcoholization: add tungstic acid catalyst, 35wt% concentration of hydrogen peroxide H in the tower reactor 2 o 2 , chlorine gas and dry gas, carry out chloroalcoholization reaction at the temperature of 35 ℃, wherein the mass ratio of tungstic acid catalyst and dry gas is 0.05:1, the hydrogen peroxide H of 35wt% concentration 2 o 2 , chlorine and dry gas should be added in such a way that H 2 o 2The volume ratio of chlorine to dry gas is about 2:1:1. Chlorohydrin is obtained.

Embodiment 3

[0114] A method for preparing ethylene oxide from dry gas, the method may further comprise the steps:

[0115] (1) Haloalcoholization: add tungstic acid catalyst, 70wt% concentration of hydrogen peroxide H in the tower reactor 2 o 2 , chlorine and dry gas, carry out chloroalcoholization reaction at a temperature of 35°C, wherein 70wt% concentration of hydrogen peroxide H 2 o 2 , chlorine gas and dry gas alkene flow should make H 2 o 2 The volume ratio of chlorine to dry gas is about 1.1:0.5:1. Chlorohydrin is obtained.

[0116] (2) Saponification: carry out saponification reaction with the chloroethanol obtained in step (1) and sodium hydroxide, obtain ethylene 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 ethylene oxide generated from the top of the tower. The saponification tempe...

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Abstract

The invention discloses a method for preparing halohydrin. The method comprises the steps of 1, haloid alcoholization, wherein H2O2, halogen simple substance and the dry gas are added into a reaction device, and carrying out a haloid alcoholization reaction to obtain halohydrin. The invention discloses a method for preparing ethylene oxide. The method comprises the steps of 1, haloid alcoholization, wherein H2O2, the halogen simple substance and the dry gas are added in the reaction device, and carrying out the haloid alcoholization reaction to obtain halohydrin; 2, saponification, wherein a saponification reaction are carried out on halohydrin obtained in the step 1 and hydroxide of alkali metal, and carrying out separation to obtain the ethylene oxide and alkali halide metal salt. The dry gas, the halogen simple substance and H2O2 are adopted to prepare halohydrin and then carrying out saponification, therefore, an ethylene ingredient in the dry gas and be utilized with an extremely high selectivity and yield to prepare ethylene oxide, and discharge of wastewater and residues is reduced by a large margin.

Description

technical field [0001] The present invention relates to a method for preparing haloethanol, and a method for preparing ethylene oxide from dry gas; more specifically, it provides a method for preparing haloethanol by using dry gas as a raw material and adopting a new haloalcohol method, and a method for preparing haloethanol by using a new alcohol 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] Epoxides contain epoxy groups, are chemically active, and are easy to ring-opening polymerization. They are important organic chemical raw materials. Ethylene oxide is an important organic chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/64C07C31/36C07D303/04C07D301/26
Inventor 陈飞彪廖维林
Owner JIANGXI SUKEER NEW MATERIAL
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