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Preparation method for polyoxymethylene dimethyl ether

A polyoxymethylene dimethyl ether and trioxymethylene technology, which is applied in 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., Achieve the effect of overcoming difficult control, promoting reaction, improving conversion rate and selectivity

Active Publication Date: 2014-05-28
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] press figure 1 As shown, the operating pressure of the catalytic distillation column is 0.5 MPa, in which the number of theoretical plates in the rectification section is 15, and the number of theoretical plates in the stripping section is 15. The separation efficiency of the upper reaction section is equivalent to the theoretical plate number of 15, 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 to trioxane is 1:2) enters from between the two reaction sections at a flow rate of 3 g / min, and the reflux ratio is 4, which is effective 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. 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] press figure 1 As shown, the operating pressure of the catalytic distillation column is 4.0 MPa, in which the number of theoretical plates in the rectification 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 the theoretical plate number of 5, 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, and the raw materials (the mass ratio of methylal to trioxane is 10:1) enter from between the two reaction sections at a flow rate of 11 g / min. The reflux ratio is 10, which is effective 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 international community’s demand for diesel has increased, while limited diesel resources have been dwindling. There has been a trend of insufficient diesel supply and rising prices. In addition, due to the high molecular weight of the alkane of 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 degree of the exhaust gas to the environment. In order to achieve the purpose of energy saving and environmental protection, the domestic and foreign fuel technology industry has increased 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 DMM n , Has a very high cetane number and oxygen content. Adding...

Claims

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Application Information

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Patent Type & Authority Patents(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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