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Method for preparing polyoxymethylene dimethyl ether

A technology of polyoxymethylene dimethyl ether and paraformaldehyde, which is applied in chemical instruments and methods, preparation of organic compounds, sustainable manufacturing/processing, etc., can solve the problem of low selectivity and achieve improved conversion rate and selectivity, Overcome uncontrollable, responsive effects

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the production of polyoxymethylene dimethyl ether, the conversion rate of paraformaldehyde and DMM 3～8 The problem of low selectivity provides a new method for preparing polyoxymethylene dimethyl ether

Method used

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  • Method for preparing polyoxymethylene dimethyl ether
  • Method for preparing polyoxymethylene dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] according to figure 1 As shown, the operating pressure of the catalytic distillation tower is 0.5 MPa, the number of theoretical plates in the stripping section is 20, the separation efficiency of the catalytic reaction section is equivalent to 25 theoretical plates, the catalyst is SAPO-34 molecular sieve, and the flow rate of paraformaldehyde is 2 g / min Enter the first theoretical plate (counting from top to bottom, the same below), methylal enters from the bottom of the catalytic reaction section with a flow rate of 1 g / min, the top of the tower is fully refluxed, and the ratio of the first part of the tower kettle to the second part of the material is 3:1, the temperature range of the catalytic reaction section under effective reaction conditions is 100-120 ° C, and the flow rate of 3 g / min is extracted at the bottom of the tower. The catalytic distillation results are shown in Table 1.

Embodiment 2～5

[0016] Other conditions are the same as in Example 1, except that the type of catalyst is changed, and the catalyst is Su Qing brand 001×4 strong acid resin, ZSM-5, SO 4 -2 / Fe 2 o 3 , Cl -1 / TiO 2 and SO 4 -2 / Fe 2 o 3 , Catalytic distillation results are shown in Table 1.

Embodiment 6

[0018] according to figure 1 As shown, the operating pressure of the catalytic distillation tower is 4.0 MPa, the number of theoretical plates in the stripping section is 5, the separation efficiency of the catalytic reaction section is equivalent to 5 theoretical plates, the catalyst is MCM-22 molecular sieve, and the flow rate of paraformaldehyde is 1 g / min and methylal enter the first theoretical plate at a flow rate of 10 g / min, total reflux at the top of the tower, the ratio of the first part of the tower to the second part of the material is 10:1, and the temperature range of the catalytic reaction section under effective reaction conditions is 180 ~ At 200°C, the bottom of the tower was withdrawn at a flow rate of 11 g / min. The catalytic distillation results are shown in Table 1.

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Abstract

The invention relates to a method for preparing polyoxymethylene dimethyl ether, which mainly solves the problems of low conversion rate of trioxymethylene and low selectivity of DMM 3-8 in current polyoxymethylene dimethyl ether production. According to the invention, under the effective reaction condition, methylal and trioxymethylene are reacted in a catalytic distillation tower, a components separation is performed simultaneously, steam at the top of the tower is condensed and then reflowed, a first part of the materials at the bottom of the tower is vaporized by a reboiler and returned back to the catalytic distillation tower, a second part of the materials is taken as produced liquid, the mass ratio of the first part to the second part is 1-10:1, wherein the trioxymethylene enters from the top of the tower, methylal can enter from any position from a stripping section to the tower top. The technical scheme of catalyst capable of being a heterogeneous phase acidic catalyst can effectively solve the problem, and the catalyst can be used for industrial production of polyoxymethylene dimethyl ether.

Description

technical field [0001] The invention relates to a method for preparing polyoxymethylene dimethyl ether. Background technique [0002] In recent years, the demand for diesel oil in the international community has been increasing day by day, but the limited resources of diesel oil have been decreasing day by day. There has been a trend of insufficient supply of diesel oil and rising prices. In addition, due to the large molecular weight of the alkane in the diesel component, the combustion rate is not high enough, and the combustion performance is not good enough, which not only increases the fuel consumption, but also deepens the pollution of the exhaust to the environment. In order to achieve the purpose of energy saving and environmental protection, domestic and foreign fuel technology industry circles have intensified the research and development of diesel additives. Polyoxymethylene dimethyl ether (simplified structure is CH 3 O(CH 2 O) n CH 3 ), referred to as DMMn,...

Claims

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Application Information

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IPC IPC(8): C07C43/30C07C41/56C07C41/58
CPCY02P20/10
Inventor 钟禄平肖剑
Owner CHINA PETROLEUM & CHEM CORP
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