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Method for preparing polyuinyl alcohol/polyamide

A polyvinyl alcohol and composite membrane technology, which is applied in the field of preparation of pervaporation composite membranes, can solve problems such as the influence of permeation flux, limit the wide application of polyvinyl alcohol composite membranes, etc., and achieves reduced production costs, excellent water permeability, and easy implementation. Effect

Inactive Publication Date: 2007-06-13
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some of these membranes have realized industrial production, the permeation flux is significantly affected (R.J.Peterson, Journal of Membrane Science, (1993), 83:81) because of the shortcoming of excessive compactness in the structure of the polyvinyl alcohol membrane. -150), thus limiting the wide application of polyvinyl alcohol composite film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Slowly add 140 parts of polyvinyl alcohol into 860 parts of water at 90°C under stirring, continue stirring for 2 hours, then stop stirring, and cool to room temperature naturally. Then turn on the stirrer, add 10 parts of maleic anhydride, an additive for crosslinking, and continue to stir for 1 hour to become a uniform PVA casting solution. Leave the casting solution to stand to remove air bubbles, then pour the casting solution in strips on the flat PA reverse osmosis membrane (aromatic PA membrane) as a support membrane, and then use a stainless steel scraper to evenly mix the casting solution Speed ​​coated on the surface of PA film. The nascent PVA / PA composite film was dried at an ambient temperature of 30° C. to form a gel-like film, and then moved to a temperature of 150° C. for thermal cross-linking treatment for 6 hours. Through these steps, a pervaporation PVA / PA composite membrane through which water is preferentially permeated is obtained. When the composi...

Embodiment 2

[0037] Slowly add 120 parts of polyvinyl alcohol into 880 parts of water at 90° C. with stirring, and then follow the steps in Example 1 to obtain a pervaporation PVA / PA composite membrane through which water preferentially permeates. The drying ambient temperature is 50°C. When the composite membrane separates 87wt% isopropanol aqueous solution as the feed liquid, the water content in the permeate is 88.65%, and the permeate flux is 106.68g / m 2 h.

Embodiment 3

[0039] Slowly add 100 parts of polyvinyl alcohol into 900 parts of water at 90° C. under stirring, and then follow the steps in Example 1 to obtain a pervaporation PVA / PA composite membrane through which water is preferentially permeated. The support film adopts aliphatic PA film, and its drying environment temperature is room temperature 15°C. When the composite membrane separates 87wt% isopropanol aqueous solution as feed liquid, the water content in the permeate is 72.60%, and the permeate flux is 114.85g / m 2 h.

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Abstract

The present invention discloses a preparation method of pervaporation composite membrane for separating organics water mixture. Said composite membrane is made up by using commercial reverse osmosis sea-water desalination polyamide (PA) composite membrane as supporting membrane and coating polyvinyl alcohol (PVA) membrane-casting liquor. Said invention also provides its preparation method and concrete steps.

Description

technical field [0001] The invention belongs to the semi-permeable membrane used in separation technology and equipment and its preparation, which is characterized by shape, structure or performance, and specifically relates to a new preparation method of pervaporation composite membrane. Background technique [0002] Pervaporation is a membrane separation process, which is a separation membrane technology with industrial application significance by compounding a highly selective polymer membrane layer on a porous support membrane. [0003] The separation performance of the pervaporation membrane is mainly characterized by the selectivity of the membrane (or the concentration of the permeate passing through the membrane) and the permeate flux. The two parameters of membrane selectivity and permeation flux are mutually restrictive. In the three-layer structure of the composite membrane, the bottom non-woven fabric acts as a mechanical reinforcement, and the middle layer is a...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/56B01D71/38
Inventor 蔡邦肖
Owner ZHEJIANG GONGSHANG UNIVERSITY
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