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Method for producing polyformaldehyde dimethyl ether

A technology of polyoxymethylene dimethyl ether and trioxymethylene, which is applied in chemical instruments and methods, preparation of organic compounds, sustainable manufacturing/processing, etc., can solve the problem of low selectivity, etc. Facilitates responses and overcomes difficult-to-control effects

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • 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 producing polyoxymethylene dimethyl ether

Method used

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  • Method for producing polyformaldehyde dimethyl ether
  • Method for producing polyformaldehyde dimethyl ether

Examples

Experimental program
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Effect test

Embodiment 1

[0014] according to figure 1 As shown, the operating pressure of the catalytic distillation column is 0.5MPa, the theoretical plate number of the stripping section is 20, the separation efficiency of the catalytic reaction section is equivalent to the theoretical plate number of 25, the catalyst is SAPO-34 molecular sieve, and the flow rate of trioxymethylene is 3 g / min. Enter the first theoretical plate (counting from top to bottom, the same below), methanol enters from the bottom of the catalytic reaction section at a flow rate of 1 g / min, the ratio of the first part of the tower to the second part of the material is 7:1, and the effective reaction conditions The temperature range of the catalytic reaction section is 110 to 130 ° C, and the bottom of the tower is extracted at a flow rate of 4 g / min. The results of catalytic distillation 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. The catalysts are Suqing 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 , the catalytic distillation results are shown in Table 1.

Embodiment 6

[0018] according to figure 1 As shown, the operating pressure of the catalytic distillation column 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 trioxymethylene is 1 g / min. and methanol into the first theoretical plate at a flow rate of 5 g / min, the ratio of the first part of the tower to the second part of the material is 15:1, the temperature range of the catalytic reaction section of the effective reaction conditions is 180 ~ 200 ℃, the bottom of the tower is 21 The flow rate of g / min is extracted, and the results of catalytic distillation are shown in Table 1.

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Abstract

The invention relates to a method for producing polyformaldehyde dimethyl ether. By the method, the problems of a low conversion rate of trioxymethylene and low selectivity of poly methoxyl dimethyl ether (DMM3-8) in the production of the polyformaldehyde dimethyl ether at present are mainly solved. In the method, methanol and the trioxymethylene are separated while reacting in a catalytic distillation tower under the effective reaction condition, steam on a tower top is refluxed after being condensed, a first part of materials at a tower bottom is vaporized by a reboiler and returns to the catalytic distillation tower, a second part of the materials is used as extraction liquid, and a mass ratio of the first part to the second part is (1-15):1, wherein the trioxymethylene enters the catalytic distillation tower from the tower top, the methanol can enter the catalytic distillation tower from a stripping section to any position on the tower top, and a catalyst in the catalytic distillation tower is a heterogeneous acidic catalyst. Through the technical scheme, the problems are better solved. The method can be used for the industrial production of the polyformaldehyde dimethyl ether.

Description

technical field [0001] The invention relates to a method for producing polyoxymethylene dimethyl ether. Background technique [0002] In recent years, the demand for diesel oil in the international community has been increasing, while the limited diesel resources are decreasing day by day. There has been a trend of insufficient diesel supply and rising prices. In addition, due to the large molecular weight of alkanes in diesel components, 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 degree of the exhaust gas to the environment. In order to achieve the purpose of energy saving and environmental protection, domestic and foreign fuel technology industries have increased their research and development efforts on diesel additives. Polyoxymethylene dimethyl ether (the structural formula is CH 3 O(CH 2 O) n CH 3 ), abbreviated as DMM n , has high cetane ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C07C41/56C07C41/58
CPCY02P20/10
Inventor 钟禄平肖剑刘志成
Owner CHINA PETROLEUM & CHEM CORP
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