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Polymethoxy dimethyl ether production system and production method

A polymethoxydimethyl ether, production system technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of low effective components, low paraformaldehyde conversion rate, long reaction time, etc. problem to achieve good results

Active Publication Date: 2021-07-09
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

[0007] In view of the problems existing in the above-mentioned prior art, the object of the present invention is to provide a polyoxymethylene dimethyl ether production system and a polyoxymethylene dimethyl ether production method, by improving the production process, mainly solve the existing The problems of raw material selection, long reaction time, difficult reaction operation, low conversion rate of paraformaldehyde and low effective components in the reaction product in the production process of polyoxymethylene dimethyl ether in the technology

Method used

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  • Polymethoxy dimethyl ether production system and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Step 1: 141kg paraformaldehyde (2) and 600kg methylal (1) are passed into a jacketed tank type stirred reactor (IA with a volume of 2 cubic meters, 140kg cationic resin catalyst is housed in it), through heat transfer oil ( 13) Feed control The reaction temperature is 100°C, the pressure is adjusted to 500kPa by nitrogen gas (3), and the first reaction solution (4) is prepared by stirring continuously for 0.5h at a rotation speed of 500r / min.

[0060] Step 2: remove the heat and cool down the first reaction liquid (4) through the heat transfer oil feed (13'), and when the temperature of the first reaction liquid (4) drops to 30°C, the first reaction liquid (4) is removed from the The outlet of the jacketed tank type stirred reactor (IA) (the discharge port is positioned at 60% of the height of the jacketed tank type stirred reactor) is discharged, and filtered through the filter (VII, the filter screen mesh number is 50) After the treatment, the second reaction solution...

Embodiment 2

[0066] Step 1: 160kg paraformaldehyde (2) and 650kg methylal (1) are passed into a jacketed tank type stirred reactor (IA with a volume of 2 cubic meters, 160kg cationic resin catalyst is housed in it), through heat transfer oil ( 13) Feed control The reaction temperature is 120°C, the pressure is adjusted to 600kPa by nitrogen gas (3), and the first reaction solution (4) is prepared by stirring continuously for 0.5h at a rotation speed of 500r / min.

[0067] Step 2: remove the heat and cool down the first reaction liquid (4) through the heat transfer oil feed (13'), and when the temperature of the first reaction liquid (4) drops to 40°C, the first reaction liquid (4) is removed from the The outlet of the jacketed tank type stirred reactor (IA) (the discharge port is located at the 55% height of the jacketed tank type stirred reactor) is discharged, and filtered through the filter (VII, the filter screen mesh number is 80) After the treatment, the second reaction solution (5) i...

Embodiment 3

[0073] Polyoxymethylene dimethyl ether was produced in the manner in Example 2, except that the outlet of the jacketed tank stirred reactor (IA) was located at 45% of the height of the jacketed tank stirred reactor.

[0074] The result shows that the conversion rate of paraformaldehyde is 89%, and PODE in the fourth reaction liquid (10) 3-4 The content is 17%.

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Abstract

The present invention relates to a polyoxymethylene dimethyl ether production system, which comprises: a reactor; a filter connected with the reactor; a reaction liquid intermediate tank connected with the filter; and an anion resin neutralization tank connected with the reaction liquid intermediate tank. By improving the production system, the problems of long raw material selection, long reaction time, difficult reaction operation, low paraformaldehyde conversion rate and low effective component content in the reaction product in the polyoxymethylene dimethyl ether production process in the prior art are mainly solved.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a production system of polyoxymethylene dimethyl ether and a production method of polyoxymethylene dimethyl ether. Background technique [0002] Polyoxymethylene dimethyl ethers (PODE or DMMn for short) is a new type of clean oil additive that has attracted much attention in recent years. It can improve diesel combustion, increase cetane number, reduce carbon dioxide and NO x emission. Polyoxymethylene dimethyl ether [CH 3 (OCH 2 ) n OCH 3 ], the value of n is 3≤n≤8, wherein n=3~4 is the best. Oligomers with n=2 and compounds with n=1 (i.e. methylal) are not suitable as diesel additives because of their low boiling point and flash point; oligomers with n>8 are easy to crystallize at low temperatures and are not Suitable as a diesel additive. Only oligomers with n=3~4 have comparable boiling point and flash point to typical diesel mixtures, and their properties are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C07C41/56
CPCC07C41/56C07C43/30Y02P20/10
Inventor 张彬刘文杰
Owner CHINA PETROLEUM & CHEM CORP
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