Method for preparing polyformaldehyde dimethyl ether by catalytic distillation

A technology of polyoxymethylene dimethyl ether and catalytic distillation, which is applied in chemical instruments and methods, preparation of organic compounds, chemical industry, etc., can solve the problem of low selectivity, improve conversion rate and selectivity, promote reaction, increase effect of concentration

Active Publication Date: 2014-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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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 by catalytic distillation

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  • Method for preparing polyformaldehyde dimethyl ether by catalytic distillation

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Comparison scheme
Effect test

Embodiment 1

[0014] according to figure 1 The process for preparing polyoxymethylene dimethyl ether by catalytic distillation is shown, the operating pressure of the catalytic distillation tower is 0.5MPa, the number of theoretical plates in the public rectification section is 20, the number of theoretical plates in the public stripping section is 20, and the separation efficiency of the reaction section is equivalent to the number of theoretical plates is 30, and the number of theoretical plates in the rectifying section on the production side is 30. The catalyst is SAPO-34 molecular sieve, paraformaldehyde enters the first theoretical plate of the reaction section at a flow rate of 2 g / min (counting from top to bottom, the same below), and methylal enters from the bottom of the reaction section at a flow rate of 1 g / min. Enter, total reflux at the top of the tower, the control tower kettle does not contain polyoxymethylene dimethyl ether DMM 3～8 , the temperature of the catalytic reacti...

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 public rectification section is 5, the number of theoretical plates in the common stripping section is 5, the separation efficiency of the reaction section is equivalent to the number of theoretical plates being 5, and the number of theoretical plates in the production side rectification section is 5. The number of theoretical boards is 5. The catalyst is MCM-22 molecular sieve, paraformaldehyde enters the first theoretical plate of the reaction section at a flow rate of 1 g / min and methylal at a flow rate of 10 g / min, the top of the tower is fully refluxed, and the control tower does not contain paraformaldehyde dimethyl Ether DMM 3～8 , the temperature of the catalytic reaction section is 180-200°C, and the catalytic distillation results are shown in Table 1.

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Abstract

The invention relates to a method for preparing polyformaldehyde dimethyl ether by catalytic distillation. 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, methylal and the trioxymethylene are separated while reacting in a reaction distillation separation tower body, steam on a tower top is subjected to total reflux after being condensed, light components are extracted from a lateral line of a separation tower and return to the tower, a solution containing the polyformaldehyde dimethyl ether is extracted from a tower bottom, the trioxymethylene enters the reaction distillation separation tower body from the top of a reaction section, the methylal and the returned light components can enter the reaction distillation separation tower body from any position of the reaction section, and a reaction distillation separation tower comprises the reaction distillation separation tower body, a tower top condenser and a tower bottom reboiler. 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 preparing polyoxymethylene dimethyl ether by catalytic distillation. 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 ...

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
Owner CHINA PETROLEUM & CHEM CORP
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