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Method for separating polyoxymethylene dimethyl ether

A technology of polyoxymethylene dimethyl ether and formaldehyde, applied in chemical instruments and methods, preparation of organic compounds, sustainable manufacturing/processing, etc., can solve problems such as pipeline blockage, and achieve good technical effects

Pending Publication Date: 2020-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the problem of pipeline blockage and intermediate product recycling that formaldehyde is prone to produce in the separation process in the existing polyoxymethylene dimethyl ether refining process, and a separation polyoxymethylene dimethyl ether is provided The method of ether, this method avoids the problems such as the pipeline clogging that formaldehyde is easy to produce in the separation process, improves the yield of target product simultaneously, has the advantages of high rectification efficiency of PODE and high yield of target product

Method used

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  • Method for separating polyoxymethylene dimethyl ether

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Experimental program
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Effect test

Embodiment 1

[0033] The reaction mixture from the synthesis reaction unit first enters the first rectification tower as the material to be separated. The first rectification tower has a total of 30 theoretical plates, the operating pressure is normal pressure, and the top temperature of the tower is 40.7 ° C. Components, the temperature of the tower bottom is 102 ℃ to obtain the first tower bottom liquid; the first tower bottom liquid enters the catalytic rectification tower containing four sections of packing, and the catalytic rectification tower has 60 theoretical plates in total, and the operating pressure is normal pressure. The kettle temperature is 168°C; the stripping section has a total of 15 theoretical plates, and the temperature is 120°C; the second section has a total of 15 theoretical plates, and the operating temperature is 95°C. Packing: There are 20 theoretical plates in the third section, filled with packing containing sulfonic acid type cation exchange resin catalyst, and...

Embodiment 2

[0041] The reaction mixture from the synthesis reaction unit first enters the first rectification tower as the material to be separated. The first rectification tower has a total of 30 theoretical plates, the operating pressure is normal pressure, and the top temperature of the tower is 40.7 ° C. Components, the temperature of the tower bottom is 102 ℃ to obtain the first tower bottom liquid; the first tower bottom liquid enters the catalytic rectification tower containing four sections of packing, and the catalytic rectification tower has 60 theoretical plates in total, and the operating pressure is normal pressure. The kettle temperature is 168°C; the stripping section has a total of 15 theoretical plates, and the temperature is 120°C; the second section has a total of 15 theoretical plates, and the operating temperature is 95°C, filled with packing containing HZSM-5 molecular sieve catalyst; The third section has a total of 20 theoretical plates, filled with fillers containi...

Embodiment 3

[0045] The reaction mixture from the synthesis reaction unit first enters the first rectification tower as the material to be separated. The first rectification tower has 20 theoretical plates in total, the operating pressure is normal pressure, and the temperature at the top of the tower is 40.7°C to obtain the first light Components, the temperature of the tower bottom is 104 ℃ to obtain the first tower bottom liquid; the first tower bottom liquid enters the catalytic rectification tower containing four sections of packing, the catalytic rectification tower has a total of 70 theoretical plates, and the operating pressure is 0.2MPa. The kettle temperature is 204°C; the stripping section has a total of 10 theoretical plates, and the temperature is 140°C; the second section has a total of 20 theoretical plates, and the operating temperature is 117°C, and the internal filling contains modified sulfonic acid type cation exchange resin Catalyst packing; the third section has a tota...

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Abstract

The invention relates to a method for separating polyoxymethylene dimethyl ether. The technical problems that in the separation process of formaldehyde, pipelines are prone to being blocked, and intermediate products are prone to being recycled are mainly solved. The method comprises the following steps: a) a to-be-separated material containing DMM, formaldehyde and PODE2-6 firstly enters a firstrectifying tower, a first light fraction is obtained at the top of the tower, and a first tower bottom liquid containing formaldehyde and PODE2-6 is obtained at the bottom of the tower; b) the first tower bottom liquid enters a catalytic distillation tower, a second light fraction is obtained from the top of the catalytic distillation tower, a material is extracted from the side line above the third section of the catalytic distillation tower, and catalytic distillation tower bottom liquid is obtained from the tower bottom; and the second light fraction is returned to the rectifying tower fromthe feeding hole through a circulating pump; and c) the catalytic distillation tower bottom liquid is fed into a product tower, and the PODE3-4 or PODE3-5 product is extracted from the tower top, sothat the problem is well solved, the yield of the target product is improved, and the method can be used for industrial polyoxymethylene dimethyl ether separation.

Description

technical field [0001] The invention relates to a method for separating polyoxymethylene dimethyl ether, in particular to preparing and purifying high-purity PODE from a reaction mixture containing polyoxymethylene dimethyl ether obtained from a reaction in which paraformaldehyde is a raw material 3-5 Methods. Background technique [0002] With the sharp increase of energy consumption in modern society, the increasing shortage of petroleum resources, and the increasing pressure on the environment, it is urgent to develop new clean diesel fuels. The use of oxygen-containing compounds as diesel additives is a convenient and effective measure without adding additional devices or changing the engine structure, and has become a new idea for the development of the petroleum industry. [0003] Polyoxymethylene dimethyl ether (PODE) is an oxygen-containing compound with the general formula: CH 3 O(CH 2 O)nCH 3 , where n is an integer ≥ 1 (generally the value is less than 10, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C07C41/56C07C41/58
CPCC07C41/56C07C41/58C07C43/30Y02P20/10
Inventor 裴义霞顾军民
Owner CHINA PETROLEUM & CHEM CORP
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