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Preparation method for polyoxymethylene dimethyl ether

A technology of polyoxymethylene dimethyl ether and paraformaldehyde, which is applied to the preparation of organic compounds, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve the problems of low conversion rate and selectivity of polyoxymethylene dimethyl ether, etc. To achieve the effect of overcoming difficult control, improving conversion rate and selectivity, and promoting reaction

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 the problem of low conversion rate and selectivity in the production of polyoxymethylene dimethyl ether at present, and a new preparation method of polyoxymethylene dimethyl ether is provided

Method used

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  • Preparation method for polyoxymethylene dimethyl ether
  • Preparation method for 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 rectifying section is 15, the number of theoretical plates in the stripping section is 15, the separation efficiency of the upper reaction section is equivalent to 15 theoretical plates, and the separation efficiency of the upper reaction section is equivalent to The number of theoretical plates is 15, the catalyst is SAPO-34 molecular sieve, the raw material (the mass ratio of methylal and paraformaldehyde is 1:2) enters between the two reaction sections with a flow rate of 3 g / min, and the reflux ratio is 4, effectively The temperature range of the catalytic reaction section of the reaction conditions is 100-130 ° C, and the bottom of the tower is extracted at a flow rate of 3 g / min. 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 4.0MPa, the number of theoretical plates in the rectifying section is 5, the number of theoretical plates in the stripping section is 5, the separation efficiency of the upper reaction section is equivalent to 5 theoretical plates, and the separation efficiency of the upper reaction section is equivalent to The number of theoretical plates is 5, the catalyst is MCM-22 molecular sieve, the raw material (the mass ratio of methylal and paraformaldehyde is 10:1) enters between the two reaction sections with a flow rate of 11 g / min, and the reflux ratio is 10, effectively The temperature range of the catalytic reaction section of the reaction conditions is 160-200 °C, and the bottom of the tower is extracted 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 preparation method for polyoxymethylene dimethyl ether, which mainly solves the problem that the trioxymethylene conversion rates and the selectivity of DMM3 to 8 are low in the production of polyoxymethylene dimethyl ether at present. Methylal and trioxymethylene are adopted to react under effective reaction conditions in a catalytic distillation tower, component separation is carried out during reaction, part of condensed overhead vapour flows back, the other part is recovered, the overhead reflux ratio is 1 to 10, distillate returns into the tower, part of bottom material is vaporized by a reboiler and then returns into the catalytic distillation tower, the rest is adopted as recovered liquid, wherein the methylal, the trioxymethylene and the returning distillate enter between the two reaction sections of the catalytic distillation tower, and the catalyst in the catalytic distillation tower is heterogeneous acidic catalyst. The technical scheme effectively solves the problem, and can be used in the industrial production of polyoxymethylene dimethyl ether.

Description

technical field [0001] The invention relates to a preparation method of 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 ), abbreviated as DMM ...

Claims

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Application Information

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