Propylene glycol preparation method

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

Active Publication Date: 2015-09-02
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
Comparison scheme
Effect test

preparation example Construction

[0014] The present 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 an unloading agent, and the unloading agent is titanium silicon Molecular sieves are used as catalyst unloading agents for reaction devices and / or regenerated titanium silicon molecular sieves are used as catalyst unloading agents for reaction devices.

[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 preferable that the catalyst further contains a titanium silicate molecular sieve freshener. This can increase the propylene oxide conversion rate and the propylene glycol selectivity. For the present invention, it is more preferable that the content of the unloading agent in the catalyst is 50-80% by weight, and the content of ...

Embodiment 1

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

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

Embodiment 2

[0058] Using the catalyst of Example 1, the molar ratio of propylene oxide, water, solvent acetone and catalyst is 1:2, and the mass ratio of solvent acetone to catalyst is 120:1. 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 the reaction for 1 hour is as follows: the conversion of propylene oxide is 38%; the selectivity of propylene glycol is 93%.

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PUM

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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 invention relates to a preparation method of propylene glycol. Background technique [0002] Propylene glycol (PG), also known as propylene glycol or 1,2-propylene glycol, 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, medicine and cosmetic industries. In the food industry, propylene glycol and fatty acids react to produce propylene glycol fatty acid esters, which are mainly used as food emulsifiers; propylene glycol is also an excellent solvent for seasonings and pigments. In the pharmaceutical industry, propylene glycol is often used as a solvent, softener and excipient in the manufacture of various ointments and ointments. Because of its good compat...

Claims

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Application Information

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Patent Type & Authority Applications(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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