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Method for synthesizing propylene glycol methyl ether

A technology for propylene glycol monomethyl ether and a synthesis method, which is applied in chemical instruments and methods, ether preparation, ether preparation by alkylene oxide, etc., can solve the problems of low catalyst activity, high reaction temperature, low selectivity, etc., and achieves short reaction time. , the effect of mild reaction conditions and simple process

Inactive Publication Date: 2009-10-07
HARBIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the problems of high reaction temperature, high pressure, low catalyst activity and low selectivity in the existing method for preparing propylene glycol methyl ether, and provide a synthetic method for propylene glycol monomethyl ether

Method used

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  • Method for synthesizing propylene glycol methyl ether
  • Method for synthesizing propylene glycol methyl ether
  • Method for synthesizing propylene glycol methyl ether

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Experimental program
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specific Embodiment approach 1

[0007] Specific embodiment one: the synthetic method of propylene glycol monomethyl ether of this embodiment is realized according to the following steps: one, the amount of substance is 0.5~0.6mol, the volume is the anhydrous methanol of 20~24.3mL, and the amount of substance is 0.015~0.025 mol, propylene oxide with a volume of 1.05-6mL and a catalyst with a substance amount of 0.004-0.02mol are uniformly mixed to obtain a mixed solution A; 2. Heat the mixed solution A to 60-70°C in a water bath, and magnetically stir for 3-5 hours , to get mixed solution B; 3. After the mixed solution B is naturally cooled to room temperature, carry out normal pressure distillation, so that the solvent in the mixed solution B is all steamed out to obtain propylene glycol monomethyl ether; wherein the catalyst in step 1 is acetate Hydroxyl methylimidazolium hydroxide, or ionic liquid composed of methylimidazolium acetate chloride and ferric chloride in a molar ratio of 1:1-3.

[0008] The che...

specific Embodiment approach 2

[0013] Embodiment 2: This embodiment differs from Embodiment 1 in that the amount of anhydrous methanol in step 1 is 0.52-0.58 mol and the volume is 21-23 mL. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0014] Embodiment 3: This embodiment differs from Embodiment 1 in that the amount of anhydrous methanol in step 1 is 0.56 mol and the volume is 22 mL. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

A method for synthesizing propylene glycol methyl ether relates to a method for synthesizing propylene glycol methyl ether. The method of the invention settles the problems of high reaction temperature, high pressure, low activity of catalyst and low selectivity existing in the prior method for preparing propylene glycol methyl ether. The method comprises the following steps: 1. preparing a compound A; 2. preparing a compound B; and 3. after naturally cooling the mixed solution B to a room temperature, atmospherically distilling and obtaining the propylene glycol methyl ether. The method of the invention has the advantages of simple process, applicable whole reaction in the condition of normal pressure and low-temperature, 93.3%-94.2% of epoxy propane conversion rate, 98.1%-99.1% of product selectivity, and no environment pollution as the whole reaction process is executed under the condition of no dissolvent. The propylene glycol methyl ether (1-methoxy-2-propanol or 2-methoxy-1-propanol) synthesized according to the invention can be synthesized by regulating the mixed liquid of acetate methyl glyoxaline hydroxide or acetate methyl glyoxaline chloride and ferric trichloride.

Description

technical field [0001] The present invention relates to a kind of synthetic method of propylene glycol monomethyl ether. Background technique [0002] Propylene glycol methyl ether (PM) is a solvent with excellent performance and low toxicity. It has the advantages of strong solvency, low volatility, high flash point, and mild odor. It has been widely used in the fields of coatings, printing and dyeing, and pesticides. At the same time, it can also be used as fuel antifreeze, detergent, extractant and organic synthesis intermediate. The molecular structure and physical and chemical properties of propylene glycol monomethyl ether are similar to those of ethylene glycol ethers, so it is considered to be an ideal substitute for more toxic ethylene glycol ethers. However, the existing method for preparing propylene glycol methyl ether has high reaction temperature (at least 100° C.), high pressure, low catalyst activity (activity is only 60% to 90%) and low selectivity (selecti...

Claims

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Application Information

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IPC IPC(8): C07C43/13C07C41/03B01J31/04B01J27/10
Inventor 蔡清海白玉路嫔
Owner HARBIN NORMAL UNIVERSITY
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