Production method of polyoxymethylene dimethylether

A polyoxymethylene dimethyl ether and production method technology, applied in chemical instruments and methods, preparation of organic compounds, sustainable manufacturing/processing, etc., can solve high energy consumption, complicated process, and low selectivity of polyoxymethylene dimethyl ether and other problems, to achieve low energy consumption, simple process, and overcome difficult 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 the low selectivity of polyoxymethylene dimethyl ether in the production process of polyoxymethylene dimethyl ether, the problems of complicated process and high energy consumption, and a new production method of polyoxymethylene dimethyl ether is provided

Method used

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  • Production method of polyoxymethylene dimethylether
  • Production method of polyoxymethylene dimethylether

Examples

Experimental program
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Embodiment 1

[0017] 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 at a flow rate of 1 g / min, the top of the tower is fully refluxed, and the flow ratio of the first and second parts of the tower kettle is 3 : 1, the catalytic reaction section temperature is 100~110 ℃, and the bottom of the tower is extracted with a flow rate of 3 g / min, and the reaction product enters the middle part of the feed side of the dividing wall rectification tower, wherein the number of theoretical plates in the common rectification section is 20, and the public ...

Embodiment 2～5

[0019] 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 , the reaction pom DMM 3～8The single-pass selectivities were 52.5%, 53.4%, 55.7% and 58.2%, respectively, to produce 10 g / min polyoxymethylene dimethyl ether DMM 3～ 8 As a benchmark, the total energy consumption of the tower top and tower bottom of the two towers in the process is shown in Table 1.

Embodiment 6

[0021] 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 flow ratio of the first and second parts of the tower kettle is 10:1, the temperature of the catalytic reaction section is 180-200 °C, and the bottom of the tower is at The flow rate of 11 g / min is extracted, and the reaction product enters the middle part of the feed side of the dividing wall rectification tower, in which the number of theoretical plates in the common rectification section is 5, and the number of theoretical plates in the common stripping section is 5. The feed side and the output side The...

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Abstract

The invention relates to a production method of polyoxymethylene dimethylether and mainly solves the problems of low selectivity of polyoxymethylene dimethylether, complex technology and high energy consumption during the present production process of polyoxymethylene dimethylether. The production method provided by the invention comprises the following steps of: carrying out a reaction between methylal and trioxane in a catalytic distillation column while separating ingredients, condensing steam on the top of the column, followed by reflux, allowing a first part of the materials on the bottom of the column to return to the catalytic distillation column after vaporizing the first part through a reboiler while a second part is used as a production stream I and the weight ratio of the first part materials to the second part materials is 1-10: 1; allowing the production stream I to enter into a divided wall distillation column for separation, and collecting polyoxymethylene dimethylether DMM3-8 from the produced central part in the divided wall distillation column. The technical scheme provided by the invention greatly solves the problems and can be used in the industrial production of polyoxymethylene dimethylether.

Description

technical field [0001] The invention relates to a production 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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Patent Type & Authority Applications(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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