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

Purification method for polyformaldehyde dimethyl ether

A technology of dimethyl ether and purification method, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of unfavorable expansion of production, affecting the continuous and stable operation of polyoxymethylene dimethyl ether separation process, and processing time long wait question

Active Publication Date: 2018-12-28
CHINA PETROLEUM & CHEM CORP +1
View PDF13 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to be condensed and refluxed for 2 hours, and the processing time is long, which is not conducive to expanding production
[0008] Therefore, the separation of formaldehyde is a technical bottleneck affecting the continuous and stable operation of the separation process of polyoxymethylene dimethyl ether

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
  • Purification method for polyformaldehyde dimethyl ether
  • Purification method for polyformaldehyde dimethyl ether
  • Purification method for polyformaldehyde dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The reaction equilibrium mixture obtained by catalytic reaction of paraformaldehyde and methylal as raw materials is firstly rectified by the first rectification tower at atmospheric pressure to remove the first fraction to obtain the first tower still liquid with a temperature of 105°C. The first tower still liquid enters the lower section of the purification tower from the bottom through the insulation pipeline, and the lower section of the purification tower is filled with Ca(OH) 2 As the filler, the upper section is filled with anhydrous calcium chloride, the temperature of the purification tower is 100°C, the residence time of the lower section is 10min, and the top of the tower contains methanol and PODE 2-5 Purification tower material. The output from the purification tower enters the methanol removal tower, where the operating pressure is normal pressure, the reflux ratio is 0.3, and the temperature of the bottom of the tower is 110°C, and the distillate contain...

Embodiment 2

[0041] The reaction equilibrium mixture obtained by catalytic reaction of paraformaldehyde and methylal as raw materials is firstly rectified by the first rectification tower at atmospheric pressure to remove the first fraction to obtain the first tower still liquid with a temperature of 105°C. The first tower kettle liquid enters the lower part of the purification tower from the bottom through the insulation pipeline. The lower part of the purification tower uses NaOH as the filler, and the upper part uses anhydrous calcium chloride as the filler. Contains methanol and PODE 2-5 Purification tower material. The output from the purification tower enters the methanol removal tower, where the operating pressure is normal pressure, the reflux ratio is 0.3, and the temperature of the bottom of the tower is 110°C, and the distillate containing methanol is extracted from the top of the tower. The bottom liquid of the methanol removal tower enters the second rectification tower and t...

Embodiment 3

[0043] The reaction equilibrium mixture obtained by catalytic reaction of paraformaldehyde and methylal as raw materials is firstly rectified by the first rectification tower at atmospheric pressure to remove the first fraction to obtain the first tower still liquid with a temperature of 105°C. The first tower still liquid enters the lower section of the purification tower from the bottom through the insulation pipeline, and the lower section of the purification tower is filled with Ca(OH) with a weight ratio of 1:1 2 The mixture with NaOH is used as filler, the upper section is filled with anhydrous calcium chloride, the temperature of the purification tower is 100°C, the residence time of the lower section is 10min, and the top of the tower contains methanol and PODE 2-5 Purification tower material. The output from the purification tower enters the methanol removal tower, where the operating pressure is normal pressure, the reflux ratio is 0.3, and the temperature of the bot...

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 technical purpose is to solve the problem that in the process of refining polyformaldehyde dimethyl ether by adopting a distillation method, formaldehyde exists and makes the long-term continuousproduction operation difficult. The method comprises the following steps that a polyformaldehyde dimethyl ether unit is synthesized to obtain a reaction equilibrium mixture, firstly, first distillatemainly comprising methylal is separated and removed to obtain first tower bottom liquid, the first tower bottom liquid flows into a purifying tower from the bottom, and purified tower material liquidcomprising methyl alcohol and PODE2-8 is obtained from the tower top; the purified tower material liquid successively flows into a methyl alcohol removing tower, a second rectifying tower and a thirdrectifying tower, and methyl alcohol distillate, a PODE2 product and a PODE3-4 / PODE3-5 product are separately obtained from the tower top.

Description

technical field [0001] The invention relates to a method for purifying polyoxymethylene dimethyl ether, in particular to preparing high-purity PODE from a reaction mixture containing polyoxymethylene dimethyl ether obtained from a reaction in which paraformaldehyde is a raw material 3～4 / PODE 3～5 Methods. Background technique [0002] With the sharp increase of energy consumption in modern society, the increasing shortage of petroleum resources, and the increasing pressure on the environment, it is urgent to develop new clean diesel fuels. The use of oxygen-containing compounds as diesel additives is a convenient and effective measure without adding additional devices or changing the engine structure, and has become a new idea for the development of the petroleum industry. [0003] Polyoxymethylene dimethyl ether (PODE) is an oxygen-containing compound with the general formula: CH 3 O(CH 2 O)nCH 3 , where n is an integer ≥ 1 (generally the value is less than 10, and for...

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): C07C41/58C07C43/30
CPCC07C41/58C07C43/30
Inventor 裴义霞顾军民赵精彩
Owner CHINA PETROLEUM & CHEM CORP
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