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Preparation method of ethylene oxide

A technology of ethylene oxide and haloethanol, which is applied in chemical instruments and methods, molecular sieve catalysts, organic chemistry, etc., can solve the problems of difficult disposal of waste residues and pollution, and achieve the goals of improving catalytic performance, solving pollution problems, and improving catalytic performance Effect

Inactive Publication Date: 2020-12-04
JIANGXI NORMAL UNIVERSITY
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Problems solved by technology

The method uses molybdenum-containing hollow titanium-silicon molecular sieve as a catalyst to realize the epoxidation reaction of ethylene in dry gas to prepare ethylene oxide; it has high selectivity to the reaction product ethylene oxide and can decompose the process of chlorohydrin method The waste residue of the traditional chlorohydrin method is difficult to handle and the problem of serious pollution is solved

Method used

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  • Preparation method of ethylene oxide
  • Preparation method of ethylene oxide
  • Preparation method of ethylene oxide

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preparation example Construction

[0032] A preparation method of ethylene oxide, comprising the following steps:

[0033] (1) Haloalcoholization: Add molybdenum-containing hollow titanium-silicon molecular sieves, hydrogen peroxide, halogen element and dry gas into the reaction device, and carry out haloalcoholization reaction to obtain haloalcohols;

[0034] (2) Saponification: carry out saponification reaction with the haloethanol in step (1) and the hydroxide of alkali metal, and separate to obtain ethylene oxide and halide alkali metal salt.

[0035] According to the present invention, the preparation method of the molybdenum-containing hollow titanium-silicon molecular sieve comprises the following steps:

[0036] (a) In the presence of an aqueous solvent, mix the silicon source with a structure-directing agent to fully hydrolyze the silicon source, then add molybdenum source, tetrabutyl titanate and phenylpropyltrimethoxysilane (PAPTMS) to obtain a precursor body solution;

[0037] (b) Pour the precurs...

Embodiment 1

[0064] A preparation method of ethylene oxide, comprising the following steps:

[0065] (1) Haloalcoholization: Add molybdenum-containing hollow titanium silicon molecular sieves, 70wt% concentration of hydrogen peroxide, chlorine and dry gas in the tower reactor, and carry out chloroalcoholization reaction at a temperature of 45°C to obtain chlorohydrin; wherein 70wt% concentration The flow rate of hydrogen peroxide, chlorine and dry gas should make the volume ratio of hydrogen peroxide, chlorine and dry gas about 1.1:0.5:1;

[0066] (2) Saponification: The chloroethanol obtained in step (1) is saponified with sodium hydroxide to obtain an ethylene oxide organic phase and sodium chloride solution; the saponification is carried out in a steel tower reactor, and the upper part is designed It is a sieve tray tower, steam enters from the bottom of the tower to blow out the generated crude ethylene oxide from the top of the tower, and the saponification temperature is controlled a...

Embodiment 2

[0074] Example 1 was repeated except that HTS-0.005 was used instead of HTS-0.0025 as catalyst.

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Abstract

The invention provides a preparation method of ethylene oxide, which takes a molybdenum-containing hollow titanium silicalite molecular sieve as a catalyst and prepares ethylene oxide through a halohydrin method.

Description

technical field [0001] The invention relates to a method for preparing ethylene oxide, in particular to a method for preparing ethylene oxide using a catalyst. Background technique [0002] Epoxy compounds are very reactive towards strained three-membered rings and are important raw materials for the chemical industry. Epoxy compounds are usually synthesized by epoxidation of olefins with oxygen, hydrogen peroxide and organic peroxides as oxidants. Ethylene oxide is one of the most important epoxy compounds, which can be derived from some important fine chemical intermediates, which are widely used in washing, pharmaceutical, printing and dyeing industries. At present, ethylene oxide is mainly used in the production of monomer ethylene glycol, synthetic detergents, nonionic surfactants, antifreeze agents, emulsifiers and other products. Industrially, it is produced on supported silver catalysts with oxidizing agents. Although both homogeneous and heterogeneous catalysts h...

Claims

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Application Information

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IPC IPC(8): C07D301/12C07D303/04B01J29/89B01J35/10B01J35/02
CPCC07D301/12C07D303/04B01J29/89B01J35/50B01J35/40B01J35/61Y02P20/52
Inventor 郭韬吴争张景赛王恒陈飞彪廖维林
Owner JIANGXI NORMAL UNIVERSITY
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