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Method for separating mixture of methanol, water and PODE2 from polyoxymethylene dimethyl ether system

A technology of polyoxymethylene dimethyl ether and PODE2, which is applied in the field of rectification separation, can solve the problems of difficult separation, high investment in equipment, and inability to clearly separate the ternary system, and achieve good separation effect, prevent secondary pollution, and be universally used strong effect

Active Publication Date: 2020-11-10
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Refined PODE provided by China Petroleum & Chemical Corporation n In the production process (CN 104557484A), it is considered that methanol-water-PODE 2 It is difficult to separate them, and the ternary system cannot be clearly separated
In a series of production processes (CN 109761766A, CN 109761768A, CN 109761772A, CN 109776288A, CN 109776289A) proposed by Tianjin University for the preparation of formaldehyde and methylal, separation of methanol, water and PODE 2 For the problem of mixtures, use membrane separation or adsorption dehydration to separate the ternary system (methanol-water-PODE 2 ), but this method requires high equipment investment

Method used

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  • Method for separating mixture of methanol, water and PODE2 from polyoxymethylene dimethyl ether system
  • Method for separating mixture of methanol, water and PODE2 from polyoxymethylene dimethyl ether system
  • Method for separating mixture of methanol, water and PODE2 from polyoxymethylene dimethyl ether system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] figure 1Among them, 1-C1 is the first rectification tower, 1-C2 is the second rectification tower, 1-D is the decanter, and 1-C3 is the third rectification tower.

[0031] The tower still outlet of the first rectifying tower 1-C1 is connected the feed port of the second rectifying tower 1-C2 by pipeline, and the tower top outlet of the second rectifying tower 1-C2 is connected the decanter 1-D by pipeline Feed port, the lower liquid outlet of decanter 1-D is connected to the tower top of the second rectification tower 1-C2 through pipeline, and the upper layer liquid outlet of decanter 1-D is connected with the third rectification tower 1-C3 through pipeline The feed port of the third rectifying tower 1-C3 is connected to the decanter 1-D through a pipeline.

[0032] Feed 1-1 is methanol, water and PODE 2 A mixture of 1-2 for methanol, 1-3 for water and PODE 2 The mixed material, 1-4 is water and PODE 2 Azeotrope, 1-5 is water, 1-6 is water-rich phase, 1-7 is PODE-r...

Embodiment 2

[0040] figure 2 Among them, 2-C1 is the first rectification tower, 2-C2 is the second rectification tower, 2-D is the decanter, and 2-C3 is the third rectification tower.

[0041] The tower still outlet of the first rectifying tower 2-C1 is connected the feed port of the second rectifying tower 2-C2 by pipeline, and the tower top outlet of the second rectifying tower 2-C2 is connected the decanter 2-D by pipeline Feed inlet, the upper layer liquid outlet of decanter 2-D is connected to the tower top of the second rectification tower 2-C2 by pipeline, and the lower layer liquid outlet of decanter 2-D is connected the third rectification tower 2-C3 by pipeline The feed port of the third rectifying tower 2-C3 is connected to the decanter 2-D through a pipeline.

[0042] Feed 2-1 is methanol, water and PODE 2 A mixture of 2-2 for methanol, 2-3 for water and PODE 2 Mixture of materials, 2-4 for water and PODE 2 Azeotrope, 2-5 is PODE 2 , 2-6 is rich PODE 2 phase, 2-7 is wate...

Embodiment 3

[0049] image 3 Among them, 3-C1 is the first rectification tower, 3-C2 is the second rectification tower, 3-D is the decanter, and 3-C3 is the third rectification tower.

[0050] The outlet of the tower still of the first rectification tower 3-C1 is connected the feed inlet of decanter 3-D by pipeline, and the lower floor liquid outlet of decanter 3-D is connected the tower top of second rectification tower 3-C2 by pipeline , the outlet of the upper layer liquid of the decanter 3-D is connected to the feed inlet of the third rectification tower 3-C3 by a pipeline, and the tower top outlet of the second rectification tower 3-C2 is connected to the inlet of the decanter 3-D by a pipeline. The feed port and the top outlet of the third rectification tower 3-C3 are connected to the decanter 3-D through a pipeline.

[0051] Material 3-1 is methanol, water and PODE 2 A mixture of 3-2 for methanol, 3-3 for water and PODE 2 The mixture of materials, 3-4 for water and PODE 2 Azeotr...

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Abstract

The invention relates to a method for separating a mixture of methanol, water and PODE2 from a polyoxymethylene dimethyl ether system. Aiming at a ternary system of methanol, water and PODE2 in a polyoxymethylene dimethyl ether production process, separation is carried out through a first rectifying tower on the premise of removing formaldehyde, methanol is obtained at the tower top, and water andPODE2 are obtained at the tower bottom. The PODE2 and water are separated through a heterogeneous azeotropic distillation method, wherein water is obtained through azeotropic distillation of a secondrectifying tower and a rectifying tower kettle, azeotrope of PODE2 and water is obtained at the top of the rectifying tower, the azeotrope is the heterogeneous azeotrope and is layered in a decanterafter being condensed by a condenser, a water-rich phase returns to the azeotropic rectifying tower, and the PODE2-rich phase enters a third rectifying tower for further separation. Then the PODE2 isobtained at the tower bottom, and an azeotrope of PODE2 and water is obtained at the tower top and returns to the decanter. According to the method, methanol, water and PODE2 of which the mass fractions are greater than 99.5 wt% are respectively obtained. The method has the characteristics of simple equipment, strong universality and good separation effect.

Description

technical field [0001] The invention belongs to the field of rectification and separation, and relates to the separation technology of polyoxymethylene dimethyl ether system, especially a method for separating methanol, water and PODE produced in the production process of polyoxymethylene dimethyl ether 2 Mixture method. Background technique [0002] PODE 2 (English name: methoxy (methoxymethoxy) methane), also known as 2,4,6-trioxane, is polymethoxy dimethyl ether (PODE n ) The substance with a degree of polymerization of 2 in the product, the chemical formula is CH 3 O(CH 2 O) 2 CH 3 . PODE 2 It has good solubility and volatility, and can be used for the absorption of C1 compounds. It is a new type of green solvent. [0003] Refined PODE provided by China Petroleum & Chemical Corporation n In the production process (CN 104557484A), it is considered that methanol-water-PODE 2 It is difficult to separate them, and the ternary system cannot be clearly separated. In...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/80C07C43/30C07C41/58
CPCC07C29/80C07C41/58C07C31/04C07C43/30
Inventor 韩振为伏传磊廉景燕李鑫钢刘学宽
Owner TIANJIN UNIV