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Permeating gasification film used for separation of methanol/dimethyl carbonate azeotropic liquid, and its preparing method

A technology of pervaporation membrane and dimethyl carbonate, applied in chemical instruments and methods, semi-permeable membrane separation, purification/separation of carbonate/haloformate, etc., can solve uneconomical problems and achieve low price , high efficiency and great development potential

Inactive Publication Date: 2007-07-25
山东蓝景膜技术工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although MeOH and DMC can be more completely separated by pervaporation, this process is not economical due to the high methanol content in the azeotrope

Method used

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  • Permeating gasification film used for separation of methanol/dimethyl carbonate azeotropic liquid, and its preparing method
  • Permeating gasification film used for separation of methanol/dimethyl carbonate azeotropic liquid, and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh an appropriate amount of PVA and deionized water into a three-neck flask, heat and stir the solution for more than 2 hours to fully dissolve the PVA, and prepare a PVA solution with a mass fraction of 7%. Also prepare a PAA aqueous solution with a mass fraction of 7% for use. Weigh PAA solution and PVA solution of different quality respectively, make PAA / PVA (mass ratio) 50 / 50 casting film solution, stir at room temperature for more than 2h, make the solution mix evenly. After the casting solution is filtered and defoamed, a layer of casting solution is scraped on the polyethersulfone base film. After the solvent is completely evaporated, the composite membrane is put into an oven for heat treatment at 100°C or higher for 1.5h. The separation performance of the prepared composite membrane was measured by a performance evaluation device, and the feed liquid was MeOH / DMC azeotropic liquid, that is, the mass fraction of MeOH was 70%. The separation performance at di...

Embodiment 2

[0041]Weigh an appropriate amount of PVA and formic acid into a three-necked flask, heat and stir the solution for more than 2 hours to fully dissolve the PVA, and prepare a PVA solution with a mass fraction of 7%. Also prepare a PAA formic acid solution with a mass fraction of 7% for use. Weigh PAA solution and PVA solution of different quality respectively, make PAA / PVA (mass ratio) 70 / 30 cast film solution, stir at room temperature for more than 2h, make the solution mix evenly. After the casting solution is filtered and degassed, scrape a layer of casting solution on the polyacrylonitrile base film. After the solvent is completely evaporated, put the composite film into an oven for heat treatment at 100°C or higher for 1.5h. The separation performance of the prepared composite membrane was measured by a performance evaluation device, and the feed liquid was MeOH / DMC azeotropic liquid, that is, the mass fraction of MeOH was 70%. The separation performance at different oper...

Embodiment 3

[0045] Weigh an appropriate amount of PVA and deionized water into a three-neck flask, heat and stir the solution for more than 2 hours to fully dissolve the PVA, and prepare a PVA solution with a mass fraction of 7%. Also prepare a PAA aqueous solution with a mass fraction of 7% for use. Weigh PAA solution and PVA solution of different quality respectively, make PAA / PVA (mass ratio) 90 / 10 film-casting liquid, stir at room temperature for more than 2h, make the solution mix evenly. After the casting solution is filtered and defoamed, a layer of casting solution is scraped on the polysulfone bottom membrane. After the solvent is completely evaporated, the composite membrane is put into an oven for heat treatment above 100°C for 1.5h. The separation performance of the prepared composite membrane was measured by a performance evaluation device, and the feed liquid was MeOH / DMC azeotropic liquid, that is, the mass fraction of MeOH was 70%. The separation performance at different ...

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Abstract

A gasifying osmotic film for separating the azeotropic methanol / dimethyl carbonate solution is prepared from polyvinyl alcohol and polyacrylic acid. Its preparing process is also disclosed.

Description

technical field [0001] The invention relates to a pervaporation membrane for separating methanol / dimethyl carbonate azeotropic liquid and a preparation method thereof. Background technique [0002] Pervaporation, or pervaporation (PV for short), is a new membrane technology for the separation of liquid (gas) and gas mixtures. It is driven by the partial vapor pressure of the components in the liquid mixture, and uses the different dissolution and diffusion speeds of the components through the dense film to achieve separation. Its outstanding advantage is that it can achieve distillation, extraction and absorption with low energy consumption. Separation tasks that are difficult to achieve with traditional methods. Pervaporation is especially suitable for the separation of near-boiling and azeotropic organic mixture solutions that are difficult or impossible to separate by distillation; the removal of trace water in organic solvents and mixed solvents, the separation of a sma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/38B01D61/36C07C68/08C07C69/96C07C31/04
Inventor 李继定王璐莹林阳政
Owner 山东蓝景膜技术工程有限公司
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