A kind of method for producing tripropylene glycol methyl ether

A technology of tripropylene glycol methyl ether and propylene glycol methyl ether, which is applied in the field of clean production of organic solvents and can solve problems such as dangerous accidents

Active Publication Date: 2016-07-06
NANTONG BAICHUAN NEW MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sodium methoxide will decompose methanol under high temperature conditions. After the materials in the rectification kettle come into contact with air, methanol and air will form explosive gas. dangerous accident

Method used

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  • A kind of method for producing tripropylene glycol methyl ether

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Effect test

Embodiment

[0054] A method for producing tripropylene glycol methyl ether, the concrete steps are as follows:

[0055] (1) Use a Karl Fischer moisture meter to measure the mass fraction of water in a certain batch of propylene glycol methyl ether extracted propylene glycol methyl ether as raw materials; use the volumetric method of acid-base titration to determine the sodium methoxide in the tower liquid The massfraction of mass fraction is 1.38%; Then analyze the area percentage of the component that can be detected by gas chromatography in the gas chromatograph with FFAP strong polarity capillary chromatographic column, multiplied by (1-the massfraction of water-sodium methylate After such a coefficient, the mass fraction of components that can be detected by gas chromatography in this batch of tower bottom liquid is obtained as:

[0056] Propylene glycol methyl ether 0.20%

[0057] 2-methoxy-1-propanol 78.21%

[0058] Dipropylene glycol methyl ether 17.82%

[0059] 1,2-Propanediol ...

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Abstract

The invention discloses a method for producing tripropylene glycol methyl ether .The method is characterized in that the method comprises the following steps: carrying out a ring opening addition reaction on a raw material propylene glycol methyl ether extracted tower bottom liquid and epoxypropane under the action of a highly alkaline catalyst, recovering excess 2-methoxy-1-propanol in the above obtained synthesized products, and rectifying to obtain dipropylene glycol methyl ether; neutralizing a dipropylene glycol methyl ether extracted alcohol ether solution by oxalic acid to neutrality, filtering out generated oxalate by a screen mesh, rectifying for separating light components, and distilling to obtain the tripropylene glycol methyl ether product; and washing wet sodium oxalate by methanol, and rectifying the obtained methanol solution to recover sodium oxalate and methanol and obtain an alcohol ether solution with a high boiling point. The boiling range of tripropylene glycol methyl ether obtained through the method accords with requirements, and a gas chromatography result shows that the total mass fraction of eight isomers of tripropylene glycol methyl ether can reach above 97.0%, so the use requirements of downstream coatings, inks and the detergent industry on tripropylene glycol methyl ether are met.

Description

technical field [0001] The invention relates to a method for producing tripropylene glycol methyl ether, belonging to the field of clean production of organic solvents. Background technique [0002] Alcohol ether products contain both alcoholic hydroxyl groups and ether bonds. They are widely used solvents in the field of new materials such as coatings and inks. Although propylene glycol ether products started later than ethylene glycol ether products, since 1982, the European Chemical Industry and Toxicology Center published a toxicity research report on ethylene glycol ether products, pointing out that ethylene glycol ether products have harmful effects on animal bone marrow and lymphoid tissue. And embryos have varying degrees of toxicity, which can lead to blood lesions. After that, glycol ether products are restricted by some domestic and foreign regulations and standards, and their output is gradually shrinking. [0003] Since the EU region has listed glycol ether pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/11C07C41/03C07C41/42
CPCC07C41/03C07C41/42C07C43/11
Inventor 薛建军张晓赵跃陈祥能吕坚
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD
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