A kind of preparation method of propylene glycol

A technology of propylene glycol and propylene oxide, which is applied in hydrolysis preparation, chemical instruments and methods, molecular sieve catalysts, etc., to achieve the effects of industrial production and application, mild reaction conditions, and simple and easy control of the process

Active Publication Date: 2017-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, there are few research reports on the use of deactivated titanium silicate molecular sieves as catalysts to catalyze the hydrolysis of propylene oxide to produce propylene glycol

Method used

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Examples

Experimental program
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preparation example Construction

[0014] The invention provides a method for preparing propylene glycol. The method comprises: contacting propylene oxide and water with a catalyst under hydrolysis reaction conditions, wherein the catalyst contains a release agent, and the release agent is made of titanium silicon Molecular sieve is used as the discharge agent of the reaction device of the catalyst and / or the discharge agent of the reaction device of the regenerated titanium silicon molecular sieve is used as the catalyst.

[0015] According to the method of the present invention, the purpose of the present invention can be achieved if the catalyst is all the unloading agent. For the present invention, it is preferred that the catalyst also contains a titanium-silicon molecular sieve fresh agent. In this way, the conversion rate of propylene oxide and the selectivity of propylene glycol can be improved. For the present invention, it is more preferred that in the catalyst, the content of the unloading agent is 5...

Embodiment 1

[0049] The catalyst used is obtained by regenerating the titanium-silicon molecular sieve TS-1 unloaded from the ammoximation reaction process of cyclohexanone. Its activity is 50%, and its activity is 95% when it is fresh. The regeneration conditions are: at 550 ℃ in the air atmosphere for 4h.

[0050] Propylene oxide, water, solvent acetone and catalyst are 1:1 according to the mol ratio of propylene oxide and water, and the mass ratio of solvent acetone and catalyst is 20:1, and the mass ratio of propylene oxide and catalyst is 5:1, in The reaction was carried out at a temperature of 25° C. and a pressure of 1.0 MPa. The result of reacting for 1 hour was as follows: the conversion rate of propylene oxide was 26%; the selectivity of propylene glycol was 94%.

Embodiment 2

[0058] Using the catalyzer of embodiment 1, propylene oxide, water, solvent acetone and catalyzer are 1:2 according to the mol ratio of propylene oxide and water, and the mass ratio of solvent acetone and catalyzer is 120:1, and the mass ratio of propylene oxide and catalyzer The mass ratio is 40:1, and the reaction is carried out at a temperature of 50° C. and a pressure of 1.5 MPa. The result of reacting for 1 hour was as follows: the conversion rate of propylene oxide was 38%; the selectivity of propylene glycol was 93%.

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Abstract

The invention provides a propylene glycol preparation method. The method is characterized in that epoxypropane and water contact with a catalyst under hydrolysis reaction conditions, wherein the catalyst contains an unloading agent, and the unloading agent is an unloading agent of a reaction device adopting titanium silicate molecular sieve as a catalyst and / or a regenerated unloading agent of the reaction device adopting the titanium silicate molecular sieve as the catalyst. The method has the advantages of mild reaction conditions, high epoxypropane conversion rate, high propylene glycol selectivity, environmental protection, no special production device requirements, simple control of the process, and facilitation of industrial production and application.

Description

technical field [0001] The present invention relates to a kind of preparation method of propylene glycol. Background technique [0002] Propylene glycol (PG), also known as propylene glycol or 1,2-propanediol, is an important raw material for unsaturated polyester, epoxy resin, and polyurethane resin. Among them, unsaturated polyester is widely used in surface coatings and reinforced plastics. Propylene glycol has good viscosity and hygroscopicity, and is non-toxic, so it is widely used as a hygroscopic agent, antifreeze, lubricant, and solvent in the food, pharmaceutical, and cosmetic industries. In the food industry, propylene glycol reacts with fatty acids to form propylene glycol fatty acid esters, which are mainly used as food emulsifiers; propylene glycol is also an excellent solvent for seasonings and pigments. Propylene glycol is often used as a solvent, softener and excipient in the manufacture of various ointments and ointments in the pharmaceutical industry. Beca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/10B01J29/89
CPCY02P20/584
Inventor 林民史春风朱斌
Owner CHINA PETROLEUM & CHEM CORP
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