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Method for preparing propylene glycol monomethyl ether by catalyzing alcoholysis of propylene epoxide

A technology of propylene glycol monomethyl ether and propylene oxide alcohol, which is applied to the preparation of ether from alkylene oxide, chemical instruments and methods, and ether preparation, etc., can solve the problems of inability to apply, harsh reaction conditions, and high reaction temperature, and is beneficial to industrial production. and application, the process is simple and easy to control, and the reaction conditions are mild.

Active Publication Date: 2015-02-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The method for producing propylene glycol ether is basically obtained by combining propylene oxide with alcohols as a raw material, but this method has high reaction temperature (above 100°C), high pressure, low catalyst activity (60%-90%) and poor selectivity (82% -90%) etc.
A kind of synthesis method of propylene glycol monomethyl ether disclosed in CN101550069A adopts ionic liquid as catalyst, but has strict requirements on raw materials, such as needing anhydrous methanol, the cost is high
[0004] There are also research reports on the one-step synthesis of propylene glycol ethers using propylene. As USP6239315 discloses that molecular sieves containing titanium, vanadium, chromium, and tin are used as epoxides and solid alkylation catalysts such as acidic resins or acidic molecular sieves to catalyze the synthesis of propylene glycol ethers from propylene, but the method uses The preparation of the catalyst is complicated, the reaction conditions for the synthesis of propylene glycol ether are harsh, and the temperature must be controlled at about zero, which consumes energy and is not easy to realize. At the same time, the process is complicated and the product selectivity is low, so it cannot be applied in actual production.

Method used

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  • Method for preparing propylene glycol monomethyl ether by catalyzing alcoholysis of propylene epoxide
  • Method for preparing propylene glycol monomethyl ether by catalyzing alcoholysis of propylene epoxide

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[0019]In the preparation method provided by the present invention, the preferred ratio of raw materials is as follows: the molar ratio of propylene oxide to methanol is preferably 0.2-5.0:1, and the mass ratio of solvent to catalyst is preferably 5-200:1.

[0020] In the preparation method provided by the present invention, the reaction temperature is preferably 20-120° C., and the reaction pressure is preferably 0.1-1.5 MPa.

[0021] In the preparation method provided by the present invention, preferably, the contacting can be carried out in the presence of a solvent, and the mass ratio of the solvent to the catalyst is 0-1000:1. The solvent is preferably one or more of C3-C8 ketones, C1-C3 acids and C2-C8 nitriles. Further preferably, said solvent is selected from one or a mixture of acetonitrile, acetone and acetic acid. In addition, since propylene oxide is miscible with methanol, methanol can be used not only as a reaction raw material, but also as a solvent in the metho...

Embodiment 1

[0047] With propylene oxide, methyl alcohol, solvent acetone and catalyst (TS-1 and phosphotungstic heteropolyacid H 3 PW 12 o 40 The mass ratio of propylene oxide and methanol is 1: 2, the mass ratio of solvent acetone and catalyst is 20: 1, the mass ratio of propylene oxide and catalyst is 20: 1, at a temperature of 35 The reaction was carried out at ℃ and a pressure of 1.0 MPa.

[0048] The result of reacting for 1 hour is as follows: the conversion rate of propylene oxide is 67%; the selectivity of propylene glycol monomethyl ether is 84%.

Embodiment 2

[0050] With propylene oxide, methyl alcohol, solvent acetone and catalyst (TS-1 and phosphotungstic heteropolyacid H 3 PW 12 o 40 The mass ratio is 0.1: 1) according to the mol ratio of propylene oxide and methyl alcohol is 1: 2, the mass ratio of solvent acetone and catalyst is 120: 1, the mass ratio of propylene oxide and catalyst is 40: 1, at temperature The reaction was carried out at 50° C. and a pressure of 1.5 MPa.

[0051] The result of reacting for 1 hour is as follows: the conversion rate of propylene oxide is 73%; the selectivity of propylene glycol monomethyl ether is 94%.

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Abstract

The invention discloses a method for preparing propylene glycol monomethyl ether by catalyzing the alcoholysis of propylene epoxide. The method comprises; mixing and contacting propylene epoxide, methanol, a solvent and a catalyst with one another under the condition of alcoholysis reaction. The method is characterized in that the catalyst comprises polymetallic oxyacid and / or polymetallic oxysalt and titanium silicalite molecular sieves. The method has the advantages of high conversion rate of propylene epoxide and good selectivity of propylene glycol monomethyl ether.

Description

technical field [0001] The invention relates to a method for preparing propylene glycol monomethyl ether by catalyzing the alcoholysis of propylene oxide. Background technique [0002] Propylene glycol ether, especially propylene glycol monomethyl ether, has two groups with strong solubility in its chemical structure—ether bond and hydroxyl group. The former is hydrophobic and can dissolve hydrophobic compounds; the latter is hydrophilic Properties, can dissolve water-soluble substances, therefore, propylene glycol ether is a general-purpose solvent with excellent performance, also known as a universal solvent. Propylene glycol methyl ether has a faint ether smell, but no strong pungent smell, making it more widely used and safe, and can be used in many fields. For example, propylene glycol methyl ether can be used in styrene-acrylic emulsion, acrylic emulsion and its latex paint system. It has the characteristics of reducing the film-forming temperature, promoting its coag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/13C07C41/03B01J31/38
Inventor 史春风林民朱斌汝迎春
Owner CHINA PETROLEUM & CHEM CORP
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