Preparation method of dipropylene glycol methyl propyl ether

A technology of dipropylene glycol methyl propyl ether and dipropylene glycol monomethyl ether, which is applied in the field of preparation of dipropylene glycol double ether, can solve the problems of difficult separation, poor reactivity, low purity, etc., and achieves simple production operation, reduced production cost, and shortened time. The effect of reaction time

Active Publication Date: 2010-12-22
ANHUI LIXING CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The raw materials are various isomers of dipropylene glycol monoether, most of the hydroxyl groups are secondary alcohols, and the reactivity is relatively poor, so that the conversion rate of this reaction is not very high. Usually, the reaction liquid also contains a certain proportion of ra

Method used

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  • Preparation method of dipropylene glycol methyl propyl ether
  • Preparation method of dipropylene glycol methyl propyl ether
  • Preparation method of dipropylene glycol methyl propyl ether

Examples

Experimental program
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Example Embodiment

[0031] Example 1

[0032] Add 148 parts of dipropylene glycol monomethyl ether to a 500ml four-necked flask, add 60 parts of sodium hydroxide, heat to 50°C and stir for 30min, then heat to between 60-80°C, and add chloropropane dropwise from the dropping funnel 100 parts, dripped in about 2h, after dripping, the temperature was raised to 80-100℃ to react for 6h, then the temperature was lowered to 40℃, and the salt was filtered out to obtain 180.7g of upper organic matter, which was analyzed by gas chromatography (see attached figure 1 ), wherein the content of dipropylene glycol methyl propyl ether is 84.26%, the content of unreacted raw material dipropylene glycol methyl propyl ether is 12.53%, and the content of chloropropane is 1.44%.

[0033] The product was poured into a 500ml separatory funnel. Add 100 parts of extractant (5% sodium chloride aqueous solution), shake well and let stand for 2h, separate the lower water layer to obtain the upper layer, which is analyzed by gas ...

Example Embodiment

[0037] Example 2

[0038] In Example 1, 100 parts of chloropropane was changed to 150 parts of bromopropane, the extractant was changed to 50 parts, and the rest were the same as in Example 1, to obtain 162.5 g of dipropylene glycol methyl propyl ether, with a content of 99.7%.

Example Embodiment

[0039] Example 3

[0040] The 60 parts of sodium hydroxide in Example 1 was changed to 100 parts of potassium carbonate, and the rest was the same as in Example 1, to obtain 149.7 g of dipropylene glycol methyl propyl ether with a content of 99.3%.

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Abstract

The invention discloses a preparation method of dipropylene glycol methyl propyl ethers. The preparation method comprises the following steps of: dissolving an organic alkali in dipropylene glycol monomethyl ether, adding chloropropane or bromopropane at the temperature of 60-90 DEG C, completing the addition and reacting for 2-10 h at 60-120 DEG C; standing and layering after completion of the reaction to obtain an organic matter of an upper layer, adding inorganic salt water solution with the concentration of 1-30% to extract the unreacted dipropylene glycol monomethyl ether, and carrying out reduced pressure distillation on a crude product of the upper layer to obtain a dipropylene glycol methyl propyl ether geometric isomer with the purity more than 99%. The invention has simple production process, short reaction time, low production cost and high product purity.

Description

technical field [0001] The invention relates to a preparation method of dipropylene glycol diether. Specifically relate to a kind of preparation method of dipropylene glycol methyl propyl ether. Background technique [0002] Propylene glycol ether is an important organic solvent, the main varieties are propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monobutyl ether, propylene glycol dimethyl ether, propylene glycol Diethyl ether, propylene glycol dibutyl ether, dipropylene glycol dimethyl ether, dipropylene glycol diethyl ether, dipropylene glycol dibutyl ether, propylene glycol methyl ethyl ether, propylene glycol methyl propyl ether, propylene glycol methyl butyl ether, dipropylene glycol methyl ethyl ether, dipropylene glycol methyl propyl ether, The toxicity of propylene glycol ether solvents such as dipropylene glycol methyl...

Claims

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Application Information

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IPC IPC(8): C07C43/11C07C41/16
Inventor 王培坤汪德林黄绪民程宏田
Owner ANHUI LIXING CHEM
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