Method for producing propylene glycol methyl ether acetate

A technology of propylene glycol methyl ether acetate and propylene glycol methyl ether, which is applied in the field of producing propylene glycol methyl ether acetate, can solve the problems of low investment, achieve high reaction efficiency, increase catalyst concentration, and avoid corrosion

Active Publication Date: 2010-04-14
JIANGSU BAICHUAN GAOKE NEW MATERIAL CO LTD +1
View PDF6 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome some shortcomings in the existing production technology of propylene glycol methyl ether acetate, provide a kind of crude product that does not contain acetic acid substantially, make the service life of

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
  • Method for producing propylene glycol methyl ether acetate
  • Method for producing propylene glycol methyl ether acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Step 1, pump 12000kg of glacial acetic acid into batching kettle 1, add 7.6kg (equivalent to 0.02% of the molar number of glacial acetic acid) monohydrate p-toluenesulfonic acid crystals, preheat to 95 ℃ by heat exchange in preheater 2 19,800kg (equivalent to 1.1 times the molar number of glacial acetic acid) mass fraction of 99.7% propylene glycol methyl ether is pumped into the batching kettle 3, and is preheated to 97° C. by heat exchange in the preheater 4;

[0029] Step 2: Reactor 5 and reboiler 6 are made of graphite-impregnated polytetrafluoroethylene, pump preheated propylene glycol methyl ether and acetic acid dissolved with p-toluenesulfonic acid into reactor 5, and heat to 113-115°C , so that the esterification reaction occurs, the water generated by the reaction enters the reactive distillation tower through the acid trap in the gas phase, and forms an azeotrope with the benzene added from the upper part of the tower, and the temperature at the top of the rea...

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 relates to a method for producing propylene glycol methyl ether acetate. The method is characterized in that a reactive kettle made of an acid-resisting material is applied to a reactive fractionating tower and the front passage of a material kettle on the lower part of the reactive fractionating tower; under the existence of a catalyst, when the number of moles of propylene glycol methyl ether is excessive compared with that of the acetic acid, the esterification is carried out concentratively in the reactive kettle; the obtained product and the unreacted material are evaporated and pass an acid catcher so that the acidic catalyst with a high boiling point is collected in liquid phase; the material of gas phase enters the reactive fractionating tower through a material inlet; an entrainer is added at the upper part of the reactive fractionating towel so as to remove the water in the material by azeotropy; under the action of the layered solid acid catalyst, the residual acetic acid in the material continues to react at the reaction section of the lower part of the material inlet of the reactive fractionating towel so that the material finally dropped in the material kettle of the reactive fractionating towel has no acidic compositions, thus avoiding the corrosion on the equipment in the subsequent separating and refining process; and the obtained product has low acidity and completely meets the requirement of the product standard.

Description

(1) Technical field [0001] The present invention relates to a kind of method of producing propylene glycol methyl ether acetate. It belongs to the technical field of organic chemical product manufacturing. (2) Background technology [0002] Propylene glycol methyl ether acetate (commonly known as propylene glycol methyl ether acetate) has both an ether bond and a carbonyl ester structure in its molecule. It has a solubility parameter similar to that of a variety of organic polymer materials. All have strong dissolving power, and their dissolving power to some resins is even better than glycol ethers such as propylene glycol methyl ether, ethylene glycol ethyl ether, and ethylene glycol butyl ether. Although its relative molecular weight is larger than that of ordinary solvents, it has good miscibility with water, and its moderate boiling point and slow volatilization make it an important solvent. It can be used as a solvent for ethyl cellulose, nitrocellulose, cellulose ac...

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): C07C69/16C07C67/08C07C67/54
CPCY02P20/584
Inventor 郑铁江赵红伟薛建军
Owner JIANGSU BAICHUAN GAOKE NEW MATERIAL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap