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Method for preparing dipropylene glycol methyl ether

A technology of dipropylene glycol methyl ether and propylene glycol methyl ether, which is applied in the field of preparing dipropylene glycol methyl ether, can solve the problems of energy consumption and low market value of 2-methoxy-1-propanol, and achieves the effect of saving energy consumption

Active Publication Date: 2014-12-17
NANTONG BAICHUAN NEW MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] When traditional techniques are used to extract dipropylene glycol methyl ether from the tower still liquid producing propylene glycol methyl ether, the 2-methoxyl-1-propanol with a lower boiling point must be extracted first, and the extracted 2-methoxyl The market value of -1-propanol is not high, but it consumes energy

Method used

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  • Method for preparing dipropylene glycol methyl ether

Examples

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Comparison scheme
Effect test

Embodiment 1

[0048] A method for preparing dipropylene glycol methyl ether, the specific steps are as follows:

[0049] (1) The reaction between the tower kettle liquid after the extraction of propylene glycol methyl ether and propylene oxide is specifically as follows:

[0050] (1a) The mass fraction of water in a certain batch of tower liquid used as raw materials measured by Karl Fischer moisture meter is 0.05%; the mass fraction of sodium methoxide in the tower liquid measured by the volumetric method of acid-base titration is 2.68 %; Analyze on a gas chromatograph with a 25m×0.32mm×0.5μm FFAP strongly polar capillary column, and multiply the area percentage of each component by (1-mass fraction of water-mass fraction of sodium methoxide), The mass fractions of some components that can be detected by gas chromatography in this batch of tower still liquid are:

[0051] Propylene glycol methyl ether 0.15%

[0052] 2-methoxy-1-propanol 77.67%

[0053] Dipropylene glycol methyl ether 17.45%

[0054...

Embodiment 2

[0088] On the basis of Example 1, other conditions remain unchanged, except that the mass fraction of the flaky sodium hydroxide used in steps (1a), (1b) and (1c) of Example 1 is changed to 97.2% of the granular solid sodium methoxide, and the mass of sodium methoxide added in step (1a) is still 2.3g, but the moles of sodium methoxide added are the total moles of propylene glycol methyl ether and 2-methoxy-1-propanol 0.010 times the number of 4 mol, and finally 1900 mL of dipropylene glycol methyl ether is obtained.

[0089] Verification test: Using FFAP strong polarity capillary column, the total mass fraction of the four isomers of dipropylene glycol methyl ether measured on the gas chromatograph is 97.7%.

[0090] Take a 100 mL sample of dipropylene glycol methyl ether and use a special device for measuring boiling range to determine that the boiling range of dipropylene glycol methyl ether is 182.6~194.4°C.

[0091] The boiling range of the dipropylene glycol methyl ether prepar...

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Abstract

The invention discloses a method for preparing dipropylene glycol methyl ether. The method for preparing the dipropylene glycol methyl ether is characterized by comprising the following steps of taking tower bottoms left after propylene glycol methyl ether is extracted as raw materials, performing a ring-opening addition reaction on the raw materials and epoxypropane in the presence of a strongly basic catalyst, recovering excessive 2-methoxy-1-propyl alcohol in the synthetic products by virtue of rectification and then separating to obtain the product dipropylene glycol methyl ether. The method for preparing the dipropylene glycol methyl ether has the advantages that as15-25% of dipropylene glycol methyl ether continues reacting with the epoxypropane to generate tripropylene glycol methyl ether which is higher in boiling point in the process of synthesizing the dipropylene glycol methyl ether by reacting the tower bottoms and the epoxypropane, enough output of the tripropylene glycol methyl ether is guaranteed by use of the synthesis method, and the tripropylene glycol methyl ether is capable of continuing dissolving catalysts such as sodium methylate and sodium hydroxide so that the sodium methylate can be prevented from being decomposed to generate methanol as being heated under the circumstance of a relatively high concentration, and therefore, the potential hazard that the methanol is possible to be in an explosion range after being mixed with air and explodes under high heat can be avoided.

Description

technical field [0001] The invention relates to a method for preparing dipropylene glycol methyl ether, belonging to the field of organic solvent preparation. 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 products as s...

Claims

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Application Information

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IPC IPC(8): C07C43/11C07C41/03
CPCC07C41/03C07C41/42C07C43/135
Inventor 郑铁江薛建军张晓陈电华徐明高
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD
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