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Separation film for separating methanol/methyl-carbonate azotrope

A dimethyl carbonate and separation membrane technology is applied in the field of separation membrane and membrane preparation for separating methanol/dimethyl carbonate azeotrope, which can solve uneconomical problems and achieve low price, high selectivity, and membrane production The effect of simple process

Inactive Publication Date: 2007-11-14
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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  • Separation film for separating methanol/methyl-carbonate azotrope
  • Separation film for separating methanol/methyl-carbonate azotrope

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 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 PVA / PAA (mass ratio) to be 90 / 10 film-casting solution, stir at room temperature for more than 1 hour, make the solution mix evenly; Filter to remove insoluble impurity particles, leave the filtered membrane solution at room temperature to remove larger bubbles; then add an appropriate amount of GA to make PVA / GA (mass ratio) 94 / 6, 88 / 12 and 83 / 17, respectively, Finally, add 2 or 3 drops of concentrated sulfuric acid and stir at room temperature for more than 30 minutes to make the solution evenly mixed. After the casting solution is filtered and defoamed, scrape a layer of casting solution with a thickness of 70-80 ...

Embodiment 2

[0033] 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 PVA / PAA (mass ratio) respectively 95 / 5, 90 / 10 and 85 / 15, stir at room temperature for more than 1 hour, make the solution mix evenly; Prepared The membrane solution is filtered under pressure to remove insoluble impurity particles, and the filtered membrane solution is left at room temperature to remove larger air bubbles; then add an appropriate amount of GA to make the PVA / GA (mass ratio) 88 / 12, and finally add 2, 3 Drop concentrated sulfuric acid and stir at room temperature for more than 30 minutes to make the solution evenly mixed. After the casting solution is filtered and defoamed, scrape a layer of casting so...

Embodiment 3

[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 to make PVA / PAA (mass ratio) 90 / 10, stir at room temperature for more than 1 hour to make the solution evenly mixed; the prepared membrane solution is filtered by pressure to remove insoluble impurity particles , the membrane solution after filtration is left standing at room temperature to remove larger bubbles; then add an appropriate amount of glutaraldehyde to make PVA / GA (mass ratio) 88 / 12, finally add 2 or 3 drops of concentrated sulfuric acid, and stir at room temperature for 30 minutes Above, make the solution mix well. After the casting solution is filtered and defoamed, scrape a layer of casting solution with a thickness of 7...

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Abstract

The present invention discloses a separation membrane for separating methyl alcohol / dimethyl carbonate azeotropic mixture and its preparation method, belonging to the field of methyl alcohol separation technology. Said separation membrane is a pervaporation membrane, the polyvinyl alcohol and polyacrylic acid are blended according to the mass ratio of 95 / 5-85 / 5, the glutaric dialdehyde can be used as cross-linking agent, and the mass ratio of polyvinyl alcohol and glutaric dialdehyde is 94 / 6-83 / 17. Its preparation method includes the following steps: firstly preparing membrane-casting liquor, on the bottom membrane (can be polyacrylonitrile bottom membrane, polysulfone bottom membrane or polyether sulfone bottom membrane) knife-coating a layer of membrane-casting liquor, drying and removing solvent to obtain composite membrane, making thermal treatment so as to obtain the invented pervaporation membrane for separating methyl alcohol / dimethyl carbonate azeotropic liquor.

Description

technical field [0001] The invention belongs to the technical scope of methanol separation, and in particular relates to a separation membrane for separating methanol / dimethyl carbonate azeotrope and a membrane preparation method thereof. Background technique [0002] Dimethyl carbonate, the molecular formula is CO(OCH 3 ) 2 , referred to as DMC, its toxicity value is similar to that of absolute ethanol, and it is a new type of chemical raw material with environment-friendly characteristics. The industrial application of DMC has attracted attention at home and abroad, and has achieved rapid development in recent years. DMC has very active chemical properties and is environmentally friendly; it is an important organic synthesis intermediate and starting material; it is also a good solvent and cleaning agent, and it is widely used in coatings, medicine, batteries and other fields. As a gasoline additive, DMC can increase the octane number of gasoline, has three times the ox...

Claims

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Application Information

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IPC IPC(8): B01D71/38C07C29/74C07C68/08C07C69/96C07C31/04
Inventor 李继定王璐莹林阳政陈翠仙
Owner 山东蓝景膜技术工程有限公司
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