Method for separating MEOH-DMC (methanol-dimethyl carbonate) through vapor permeation

A technology of MEOH-DMC and steam, which is applied in the direction of semipermeable membrane separation, chemical instruments and methods, separation/purification of hydroxyl compounds, etc. Short service life and other problems, to achieve the effect of reducing cooling operation costs, reducing condensation operation costs, and low operating costs

Active Publication Date: 2014-01-08
BEIJING ZHONGHUA DINGSHENG ENERGY SAVING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of the low permeation flux and high investment in the existing technology, the organic membrane has poor dimethyl carbonate swelling resistance, short membrane service life, and high vacuum degree is required on the permeable membrane side, which makes it difficult to condense the permeated gas and consumes a lot of water. The invention provides a new method for separating MEOH-DMC by vapor permeation, which can effectively improve the separation performance of MEOH-DMC. Compared with the prior art, it has the advantages of small investment, long service life of molecular sieve membrane and low operating cost. , easy industrialization and other advantages

Method used

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  • Method for separating MEOH-DMC (methanol-dimethyl carbonate) through vapor permeation
  • Method for separating MEOH-DMC (methanol-dimethyl carbonate) through vapor permeation

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0033] Example 1 Preparation of NaY-Zn molecular sieve membrane

[0034] (1) with Na 2 O n SiO 2 , Al(OH) 3 , Zn(OH) 2 As the raw material, prepare the raw material liquid SiO 2 - Na 2 O-Al 2 O 3 -ZnO -H 2 O system, the molar ratio of each component is: Na 2 O: Al 2 O 3 : SiO 2 :ZnO:H 2 O=16:1:15:1:360. According to the above molar ratio as the formula, calculate the required amount of silicon source, aluminum source, zinc source and water, mix the silicon solution, aluminum solution and zinc solution vigorously to form a gel, then pour it into the reactor of polymer material, put the The raw gel solution was aged at room temperature for 5 hours.

[0035] (2) Porous a-Al coated with NaY-Zn molecular sieve seeds 2 O 3 The supporting membrane tube is fixed in the synthesis reaction kettle, the raw gel solution prepared in step (1) is poured into the reaction kettle, and after sealing, a hydrothermal reaction is carried out at 100 ° C for 2 hours; the obtained m...

Embodiment 2

[0038] Example 2 Preparation of NaY-Zn molecular sieve membrane

[0039] The steps are the same as those in Example 1, but the molar ratios of the components are different.

[0040] In this embodiment, the molar ratio of each component is: Na 2 O: Al 2 O 3 : SiO 2 : ZnO : H 2 O=18:1:19:3:700. The steps are:

[0041] (1) with Na 2 O n SiO 2 , Al(OH) 3 , Zn(OH) 2 As the raw material, prepare the raw material liquid SiO 2 - Na 2 O-Al 2 O 3 -ZnO -H 2 O system, the molar ratio of each component is: Na 2 O: Al 2 O 3 : SiO 2 :ZnO:H 2 O=18:1:19:3:700. According to the above molar ratio as the formula, calculate the required amount of silicon source, aluminum source, zinc source and water, mix the silicon solution, aluminum solution and zinc solution vigorously to form a gel, then pour it into the reactor of polymer material, put the The raw gel solution was aged at room temperature for 14 hours.

[0042] (2) Porous a-Al coated with NaY-Zn molecular sieve see...

Embodiment 3

[0045] Example 3 Preparation of NaY-Zn molecular sieve membrane

[0046] In this embodiment, the molar ratio of each component is: Na 2 O: Al 2 O 3 : SiO 2 :ZnO:H 2 O=23:1:24:5:900, the steps are:

[0047] (1) with Na 2 O n SiO 2 , Al(OH) 3 , Zn(OH) 2 As the raw material, prepare the raw material liquid SiO 2 - Na 2 O-Al 2 O 3 -ZnO -H 2 O system, the molar ratio of each component is: Na 2 O: Al 2 O 3 : SiO 2 :ZnO:H 2 O=23:1:24:5:900. According to the above molar ratio as the formula, calculate the required amount of silicon source, aluminum source, zinc source and water, mix the silicon solution, aluminum solution and zinc solution vigorously to form a gel, then pour it into the reactor of polymer material, put the The raw gel solution was aged at room temperature for 18 hours.

[0048] (2) Porous a-Al coated with NaY-Zn molecular sieve seeds 2 O 3 The supporting membrane tube is fixed in the synthesis reactor, the raw gel solution prepared in step (...

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Abstract

The invention discloses a method for separating MEOH-DMC (methanol-dimethyl carbonate) through vapor permeation, which belongs to the technical field of separation of methanol-dimethyl carbonate. The method comprises the following steps: firstly, with Na2O.n, SiO2, Al (OH)3 and Zn (OH) 2 as raw materials and a porous a-Al2O3 supporting membrane tube or a porous mullite membrane tube as a supporting membrane tube, preparing a NaY-Zn molecular sieve membrane through hydrothermal synthesis, and then, conveying MEOH-DMC saturated mixed vapor with temperature of 121-140 DEG C and pressure of 0.63-1.08 Mpa into a molecular sieve membrane separator equipped with the NaY-Zn molecular sieve membrane, and maintaining the vacuum absolute pressure of the permeation side of the molecular sieve membrane separator to 28-95 Kpa through a vacuumizing method, wherein the MEOH in the mixed vapor preferentially permeates through the molecular sieve membrane to be enriched on the permeation side of the membrane and is condensed into liquid under low vacuum degree, and the mixed vapor on the retentate side is further separated by multiple levels of serially connected molecular sieve membrane separators. The method disclosed by the invention can be used for effectively improving the separating performance of the MEOH-DMC and has the advantages of small investment, low operation cost and the like.

Description

technical field [0001] The invention relates to a method for separating methanol-dimethyl carbonate, belonging to the technical field of methanol-dimethyl carbonate separation. Background technique [0002] In the current industrial production method of dimethyl carbonate, the initial product can only be a mixture of low-concentration MEOH-DMC (methanol-dimethyl carbonate). Under normal pressure, it is relatively easy to obtain the binary azeotrope formed by MEOH-DMC substance, its mass percent concentration is about 70% MeOH and 30% DMC. At present, the more common DMC refining method in industrial production is to adopt the pressure distillation method to meet the requirements of the separated products, but the high energy consumption of the pressure distillation method directly affects the economic benefits of the entire plant, so the separation of low-cost DMC and MeOH Research and development of methods is particularly important. [0003] The separation techniques of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D71/02C07C69/96C07C29/74C07C31/04C07C68/08
Inventor 张锋新
Owner BEIJING ZHONGHUA DINGSHENG ENERGY SAVING TECH
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