Device and method for refining and separating polyoxymethylene dimethyl ether containing formaldehyde

A polymethoxydimethyl ether and formaldehyde technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry and other directions, can solve the problems of formaldehyde polymerization clogging equipment, difficult continuous operation, etc., to solve the problem of formaldehyde polymerization, A wide range of applications, the effect of reducing consumption

Pending Publication Date: 2017-09-01
TIANJIN UNIV
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Problems solved by technology

[0006] In order to eliminate the problem of formaldehyde on the inner wall of the condenser and the condensation pipeline polymerization blockage of equipment during the refining and separation of formaldehyde-containing polyoxyl dimethyl ether products, the patent of the pres

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  • Device and method for refining and separating polyoxymethylene dimethyl ether containing formaldehyde

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[0036] In the following, the present invention will be further clarified with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, those skilled in the art have a great understanding of the present invention. Various equivalent modifications fall within the scope defined by the appended claims of this application.

[0037] In the synthesis product of polymethoxy dimethyl ether, there will always be a certain amount of formaldehyde, and the aldehyde-containing gas phase material flow is prone to formaldehyde self-polymerization during the atmospheric pressure condensation process to form paraformaldehyde. The inner walls of equipment and pipelines block the pipelines, forcing the distillation process to be unable to continue. For materials with higher aldehyde content, a little formald...

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Abstract

The invention relates to a device and method for refining and separating formaldehyde-containing polyoxymethylene dimethyl ether, which mainly includes a separation system and a rinsing and condensation circulation system. The separation system mainly consists of reaction unit (I), deacidification device (II), first atmospheric fractionation column (III), second atmospheric fractionation column (IV), vacuum distillation column (IX), vacuum refining Distillation tower (X), dehydration device (VII); the main devices of the leaching condensation circulation system include the first rinsing absorption tower (V), the second leaching absorption tower (VI) and the eluent storage tank (Ⅷ ) and related piping components. The present invention effectively solves the problem of formaldehyde polymerization blocking the condenser and pipelines in the process of separating aldehyde-containing polyoxymethylene dimethyl ether products through the organic combination of separation and rinsing systems, and 100% recovery of formaldehyde in the separated products realizes The continuous separation process of formaldehyde-containing polyoxymethylene dimethyl ether products with DMM3-6 as the product is realized, which is energy-saving and environmentally friendly.

Description

technical field [0001] The invention relates to a device and method for refining and separating formaldehyde-containing polyoxymethylene dimethyl ether, in particular to a process for producing DMM3-6 suitable as a diesel oil additive. Background technique [0002] Polyoxymethylene dimethyl ethers (DMMn for short), also known as polyoxymethylene dimethyl ether. The molecular formula is CH3O(CH2O)nCH3(n≥1), which is currently recognized as a new type of environmentally friendly diesel additive component. Adding 5% to 30% polyoxymethylene dimethyl ether in diesel oil can greatly reduce the emission of NOx and particulate pollutants in the exhaust gas. The properties of 20% PODE3-8 mixed oil samples meet the national standard of 0# diesel oil. At the same time It is a very good diesel additive to reduce the freezing point of diesel from 0°C to -6°C, increase the cetane number of diesel from 46 to 53.6, and increase the closed flash point from 55°C to 57°C. Therefore, the deve...

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Application Information

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IPC IPC(8): C07C41/58C07C43/30
CPCC07C41/58C07C43/30
Inventor 蔡旺锋张晓宇张旭斌吴松海
Owner TIANJIN UNIV
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