Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF7 Cites 3 Cited by
  • Summary
  • 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 raw material dipropylene glycol Monoether, its boiling point is close to the boiling point of product dipropylene glycol methyl propyl ether, is difficult to separate, and the purity of existing dipropylene glycol methyl propyl ether product on the market is low, needs to be improved by suitable method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
Effect test

Embodiment 1

[0032] Add 148 parts of dipropylene glycol monomethyl ether into a 500ml four-neck bottle, add 60 parts of sodium hydroxide, raise the temperature to 50°C and stir for 30 minutes, then raise the temperature to 60-80°C, and drop chloropropane from the dropping funnel 100 parts, drop in about 2 hours, after the drop, raise the temperature to 80-100°C to react for 6h, then cool down to below 40°C, filter out the salt, and obtain 180.7g of organic matter in the upper layer, which is analyzed by gas chromatography (see attached figure 1 ), wherein the dipropylene glycol methyl propyl ether content is 84.26%, the unreacted raw material dipropylene glycol methyl propyl ether content is 12.53%, and 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 fully and leave to separate for 2 hours, separate the lower water layer to obtain the upper product, which is analyzed by gas chro...

Embodiment 2

[0038] Change 100 parts of chloropropane in embodiment 1 into 150 parts of bromopropane, change the extractant into 50 parts, all the other are the same as embodiment 1, obtain dipropylene glycol methyl propyl ether 162.5g, content is 99.7%.

Embodiment 3

[0040] 60 parts of sodium hydroxide in embodiment 1 are changed into 100 parts of potassium carbonate, all the other are with embodiment 1, obtain dipropylene glycol methyl propyl ether 149.7g, and content is 99.3%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07C43/11C07C41/16
Inventor 王培坤汪德林黄绪民程宏田
Owner ANHUI LIXING CHEM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com