Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method of polyoxymethylene dimethyl ether

A polymethoxydimethyl ether and formaldehyde solution technology, which is applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problems of preparing polymethoxydimethyl ether, low utilization rate of raw materials and production efficiency low problems, to achieve the effect of high product separation efficiency, improved conversion rate and selectivity, and low cost

Active Publication Date: 2017-12-08
SHAANXI HENGHUA ENERGY TECH CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing polyoxymethylene dimethyl ether preparation method needs to generate intermediate products, the utilization rate of raw materials is low, and the production efficiency is low
[0008] 2. It is impossible to directly prepare polyoxymethylene dimethyl ether with industrial grade methanol, industrial grade methylal and industrial grade formaldehyde solution as raw materials, and the production cost is high

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
  • A kind of preparation method of polyoxymethylene dimethyl ether
  • A kind of preparation method of polyoxymethylene dimethyl ether
  • A kind of preparation method of polyoxymethylene dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] through nitrogen figure 1 The system shown is pressurized to maintain the system pressure at 2.5MPa. The raw material is industrial methylal and industrial formaldehyde solution, and the catalyst is a resin catalyst HD-8. The raw material is first preheated, then pumped into the expanded bed reactor, and then enters from the top of the laminar flow bed reactor, and the reactor tower A mixture of polyoxymethylene dimethyl ether and unreacted raw materials flowed out from the bottom. The reaction temperature of the reactor is controlled at 100°C, the ratio of methylal and formaldehyde solution is about 1:2, and high-concentration products (DMM3-8) in the reaction product account for about 41% of the product material. crude product via figure 2 The system shown is for separation and purification, and the concentrations of low-boiler products and high-concentration products can reach more than 95% respectively, and the products are colorless and transparent liquids.

Embodiment 2

[0048] The synthetic process flow is the same as Example 1, the raw materials are industrial methanol and industrial formaldehyde solution, and the catalyst is a resin-type catalyst D-61. The reaction temperature of the reactor is controlled at 100°C, the ratio of methanol and formaldehyde solution is about 1:0.7, and the high-concentration products (DMM3-8) in the reaction products account for about 20% of the product materials. crude product via figure 2 The system shown is for separation and purification, and the concentrations of low-boiler products and high-concentration products can reach more than 95% respectively, and the products are colorless and transparent liquids.

Embodiment 3

[0050] The synthetic process flow is the same as Example 1, the raw materials are industrial methylal and industrial formaldehyde solution, and the catalyst is a resin type catalyst HD-8. The reaction temperature of the reactor is controlled at 100°C, the ratio of methylal and formaldehyde solution is about 1:2, and high-concentration products (DMM3-8) in the reaction product account for about 20% of the product material. crude product via image 3 The thin-film distillation system shown is used for separation and purification, and the concentration of low-boiler products and high-concentration products can reach more than 97% respectively, and the products are colorless and transparent liquids.

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 provides a preparation method of polymethoxy dimethyl ether. The method comprises the following steps: by using industrial-grade methanol and a formaldehyde solution as raw materials or using industrial-grade methylal and a formaldehyde solution as raw materials, heating the raw materials, and pumping the heated raw materials from the bottom end of an expanded bed reactor to contact a catalyst and carry out reaction; after the reaction finishes, sending the reaction product from the top end of a laminar flow bed reactor to contact a catalyst and carry out reaction, thereby obtaining a crude product polymethoxy dimethyl ether; and separating and purifying the crude product polymethoxy dimethyl ether to obtain the polymethoxy dimethyl ether. The cheap industrial-grade raw materials methanol, methylal and formaldehyde solution are used in the industrial production process, thereby enhancing the reaction conversion rate and lowering the industrial production cost.

Description

technical field [0001] The invention relates to a preparation method of polyoxymethylene dimethyl ether, in particular to a device and method for preparing polyoxymethylene dimethyl ether from an industrial-grade formaldehyde solution using a laminar flow bed reactor combined with a thin film distillation process. Background technique [0002] With the development of the world economy, the continuous improvement of human living standards, the increase in the number of transportation means, and the continuous increase in oil energy consumption. However, my country is a country with more coal and less oil, and using abundant coal resources to produce petroleum substitutes is one of the main ways to solve energy problems in our country. The environmental damage brought about by industrial development and people's lives has been very obvious, the air pollution is very serious, and the smog weather is getting worse. In the case of alleviating the shortage of petroleum energy, it...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/56C07C41/58C07C43/30
CPCC07C41/56C07C41/58C07C43/30
Inventor 吴海杰胡海峰黄龙华张廉杰胡红军徐磊
Owner SHAANXI HENGHUA ENERGY TECH CO LTD