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Method and device for separating methylal in polyoxymethylene dimethyl ether system

A technology for polymethoxydimethyl ether and methylal, which is applied in the field of rectification and separation, can solve the problems of high energy consumption for separation, limit the industrialization of technological processes, complicated separation process, etc., and can meet the requirements of purity, good economic benefits, The effect of simplifying the separation process

Pending 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

If methanol is not produced in the process and in the reaction raw materials and reaction products, then the separation of methylal is simple; if there is methanol in the process reaction raw materials and methylal in the reaction products, the separation process is complicated and the separation energy consumption is large, which limits the process. Industrialization of Processes

Method used

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  • Method and device for separating methylal in polyoxymethylene dimethyl ether system
  • Method and device for separating methylal in polyoxymethylene dimethyl ether system
  • Method and device for separating methylal in polyoxymethylene dimethyl ether system

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A reactive extraction rectification separation of methylal, methanol, water, formaldehyde, paraformaldehyde and PODE 2 For the separation process of the mixture, the reactive extractive distillation column 1 has 11 theoretical plates. Using formaldehyde solution as a reactive extractant, formaldehyde solution and methylal, methanol, water, formaldehyde, paraformaldehyde and PODE 2 After the mixture is mixed, it is added from the 8th theoretical plate (the number of plates is from top to bottom), the ratio of formaldehyde / methanol is 2.3, and the amount of addition is 5000 kg / hr. The operating pressure of the reactive extractive distillation column is 101.3kPa, the top reflux ratio is 0.89, the top temperature is 42°C, the bottom temperature is 98.2°C, and the methylal product with a mass fraction of 99.0wt% is obtained at the top of the tower.

[0038] Feed composition as shown in the table

[0039] Numbering components Content (wt.%) 1 Methylal 4...

Embodiment 2

[0041] A reactive extraction rectification separation of methylal, methanol, water, formaldehyde, paraformaldehyde and PODE 2 For the separation process of the mixture, the reactive extractive distillation column 1 has 11 theoretical plates. Formaldehyde solution is used as the reaction extractant, and the formaldehyde solution is added from the third theoretical plate (the number of plates is from top to bottom). Methylal, methanol, water, formaldehyde, paraformaldehyde and PODE 2 After the mixture is mixed, it is added from the 8th theoretical plate (the number of plates is from top to bottom), the ratio of formaldehyde / methanol is 2.3, and the amount of addition is 5000 kg / hr. The operating pressure of the reactive extractive distillation column is 101.3kPa, the top reflux ratio is 0.89, the top temperature is 42°C, the bottom temperature is 98.2°C, and the methylal product with a mass fraction of 99.0wt% is obtained at the top of the tower.

[0042] The composition is as ...

Embodiment 3

[0045] A reactive extraction rectification separation of methylal, methanol, water, formaldehyde, paraformaldehyde and PODE 2 For the separation process of the mixture, the reactive extractive distillation column 1 has 11 theoretical plates. Using formaldehyde solution as a reactive extractant, formaldehyde solution and methylal, methanol, water, formaldehyde, paraformaldehyde and PODE 2 After the mixture is mixed, it is added from the 8th theoretical plate (the number of plates is from top to bottom), the formaldehyde / methanol ratio is 1.6, and the addition amount is 5000 kg / hr. The operating pressure of the reactive extractive distillation tower is 101.3kPa, the top reflux ratio is 2.0, the top temperature is 42°C, the bottom temperature is 98.2°C, and the top of the tower obtains a methylal product with a mass fraction of 99.6wt%.

[0046] The composition is as shown in the table:

[0047]

[0048]

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Abstract

The invention provides a method for separating methylal in a polyoxymethylene dimethyl ether system, which comprises the following steps: separating a mixture of methylal, methanol, formaldehyde, trioxymethylene and PODE2, controlling the mass flow ratio of formaldehyde to methanol at (1:2)-(5:1), and separating the mixture by reaction extractive distillation; when the mass flow ratio of the formaldehyde to the methanol in the mixture is (1:2)-(5:1), directly carrying out reaction extractive distillation; or if not, introducing a formaldehyde solution into the rectifying tower to reach the ratio. According to the method, substances originally existing in the system are used as the reaction extraction agent, so that a reaction extraction agent recovery tower is omitted, the equipment cost is reduced, the technological process is simplified, and effective separation of methylal is realized.

Description

technical field [0001] The invention belongs to the field of rectification and separation, and relates to a polyoxymethylene dimethyl ether system, especially a polyoxymethylene dimethyl ether system in which feed materials are methylal, methanol, formaldehyde, paraformaldehyde and PODE 2 A method and device for separating and refining methylal by introducing formaldehyde solution into a rectification tower. Background technique [0002] Methylal is a widely used industrial raw material, mainly used in the production of anion exchange resins, as well as solvents and special fuels, and its solubility is stronger than that of ether and acetone. Methylal is an important raw material for preparing polyoxymethylene dimethyl ether, and it is also an important component of polyoxymethylene dimethyl ether products. [0003] Polyoxymethylene dimethyl ether is a new type of diesel additive, the chemical formula is expressed as CH 3 O(CH 2 O) n CH 3 (its n>1, generally less tha...

Claims

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Application Information

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IPC IPC(8): C07C41/58C07C43/30
CPCC07C41/58C07C43/30
Inventor 李鑫钢伏传磊韩振为廉景燕高鑫
Owner TIANJIN UNIV
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