Method of purifying dipropylene glycol dimethyl ether
A technology of dipropylene glycol dimethyl ether and dipropylene glycol methyl ether, which is applied in the field of purifying dipropylene glycol dimethyl ether, can solve problems such as unrealistic separation and influence on the application range of subsequent products of dipropylene glycol methyl ether, and improve product quality and realize safety Environmentally friendly production and the effect of reducing energy consumption
Inactive Publication Date: 2016-10-12
NANTONG BAICHUAN NEW MATERIAL CO LTD +2
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Problems solved by technology
Due to the above factors, the product content of dipropylene glycol methyl ether after rectification is generally between 95% and 96%, which seriously affects the application range of dipropylene glycol methyl ether and its follow-up products
[0006] Since the methanol solution used in the continuous production of propylene glycol methyl ether today contains a small amount of water, the water in the propylene oxide and methanol reacts to form a small amount of propylene glycol during the etherification reaction. This reaction cannot be avoided.
At the same time, propylene glycol is miscible with dipropylene glycol methyl ether, and the boiling point range of the four components of dipropylene glycol methyl ether completely contains propylene glycol. It is not realistic to hope to separate directly by rectification
Method used
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Experimental program
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Effect test
Embodiment
[0027] A new method for producing dipropylene glycol methyl ether, the steps comprising:
[0028] (1) Analysis of the components of the tower bottom liquid: inject the sulfuric acid catalyst and the heavy component dipropylene glycol methyl ether into the reaction kettle, measure the mass fraction of water and sodium methoxide in the tower bottom liquid, and then detect and calculate the The mass fraction of some components that can be detected by gas chromatography in the still liquid; the mass fraction of a certain batch of dipropylene glycol methyl ether crude product used as raw material is 95% by Karl Fischer moisture meter, and it is determined by the volumetric method of acid-base titration The massfraction of the propylene glycol in the tower bottom liquid is 2.50%, analyze the area percent of the component that can be detected by chromatography in the tower bottom liquid with FFAP strong polarity capillary chromatographic column on the gas chromatograph, multiply (1-th...
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The invention relates to a method for purifying dipropylene glycol dimethyl ether. The crude product of dipropylene glycol methyl ether is used as a raw material, and the acetal reaction of the crude product of dipropylene glycol methyl ether and excess mixed aldehyde waste liquid is first carried out under the catalysis of sulfuric acid. The propylene glycol reacts to form a cyclic acetal structure; then after the reaction is completed, negative pressure rectification is carried out, and finally the rectified solution is collected separately according to the different components. The advantage of the present invention is: adopt the dipropylene glycol methyl ether crude product of propylene glycol ether production enterprise as raw material, through the purification method of the present invention, can improve product quality greatly, guarantee the manufacture of high-quality product; Therefore, dipropylene glycol methyl ether can be purified as downstream Environmentally friendly solvents such as high-purity dipropylene glycol methyl ether that are urgently needed by enterprises such as water-based latex, plasticizers, coatings, inks and cleaning agents.
Description
technical field [0001] The invention belongs to the field of safe production of organic solvents, in particular to a method for purifying dipropylene glycol dimethyl ether. 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...
Claims
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IPC IPC(8): C07C41/44C07C43/13
CPCC07C41/44
Inventor 曹圣平孙百亚俞晔虎陶植肖春生姜伟伟陈电华
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD