A kind of polyvinyl alcohol film with diene compound as crosslinking agent and preparation method thereof

A diene compound, polyvinyl alcohol technology, applied in the field of membrane separation, can solve problems such as limiting the application range of PVA, achieve high permeation flux and separation factor, ensure hydrophilicity, and be easy to operate.

Active Publication Date: 2018-08-21
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its excessive water solubility and high crystallinity, the application range of PVA is limited, and moderate modification is required to improve its practicability in the field of membrane separation.

Method used

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  • A kind of polyvinyl alcohol film with diene compound as crosslinking agent and preparation method thereof
  • A kind of polyvinyl alcohol film with diene compound as crosslinking agent and preparation method thereof
  • A kind of polyvinyl alcohol film with diene compound as crosslinking agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of diene compound is used as crosslinking agent to prepare polyvinyl alcohol pervaporation membrane, comprises the following steps, and described formula ratio is by weight:

[0030] (1) Take 5 parts of PVA AH-26 (molecular weight 114400, degree of alcoholysis 97-98.8%), 100 parts of deionized water, stir at 90°C for 6 hours, let stand for defoaming, and cool to room temperature.

[0031] (2) Add 1 part of initiator ammonium persulfate and 0.3 part of cross-linking agent N'N-methylenebisacrylamide into the PVA aqueous solution, and stir at room temperature for 6 hours to obtain a casting solution.

[0032] (3) Coat the prepared casting solution on the polyacrylonitrile base film with a scraper to a thickness of 10 μm.

[0033] (4) Put the above-scraped film into an oven at 80°C for heat treatment for 2 hours to obtain a PVA pervaporation film.

[0034] Using the pervaporation membrane separation device, the cross-linked PVA / PAN pervaporation membrane prepared in...

Embodiment 2

[0039] Preparing a polyvinyl alcohol pervaporation membrane with a diene compound as a crosslinking agent comprises the following steps, and the formula ratio is by weight:

[0040] (1) Take 5 parts of PVA AH-26 (molecular weight 114400, degree of alcoholysis 97-98.8%), 100 parts of deionized water, stir at 90°C for 6 hours, let stand for defoaming, and cool to room temperature.

[0041] (2) Add 1.5 parts of initiator potassium persulfate and 0.2 parts of cross-linking agent N'N-methylenebisacrylamide into the PVA aqueous solution, stir at room temperature for 6 hours to obtain a casting solution.

[0042] (3) Coat the prepared casting solution on the polyacrylonitrile base film with a scraper to a thickness of 10 μm.

[0043] (4) Put the above-scraped film into an oven at 80°C for heat treatment for 2 hours to obtain a PVA pervaporation film.

[0044] Using the pervaporation membrane separation device, the cross-linked PVA / PAN pervaporation membrane prepared in this example ...

Embodiment 3

[0049] Preparing a polyvinyl alcohol pervaporation membrane with a diene compound as a crosslinking agent comprises the following steps, and the formula ratio is by weight:

[0050] (1) Take 5 parts of PVA-1799 (molecular weight 82000, degree of alcoholysis 99.8-100%), 100 parts of deionized water, stir at 90°C for 6 hours, let stand for defoaming, and cool to room temperature.

[0051] (2) Add 2 parts of initiator sodium persulfate and 0.3 parts of crosslinking agent N'N-methylenebisacrylamide into the PVA aqueous solution, stir at room temperature for 6 hours, and obtain a casting solution.

[0052] (3) Coat the prepared casting solution on the polysulfone base film with a spatula, with a thickness of 8 μm.

[0053] (4) Put the above-scraped film into an oven at 80°C for heat treatment for 4 hours to obtain a PVA pervaporation film.

[0054] Using the pervaporation membrane separation device, the cross-linked PVA / PS pervaporation membrane prepared in this example was subjec...

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Abstract

The invention provides a polyvinyl alcohol membrane with a diene compound as a cross-linking agent. The preparation method is characterized in that after polyvinyl alcohol methylene carbon is dehydrogenized, covalent bonds are formed by the polyvinyl alcohol methylene carbon and the diene compound, and crosslinking occurs. The method is simple, practicable and easy to operate, the prepared crosslinking PVA composite membrane is of a perfect pervaporation membrane structure, good selective permeation performance for water is achieved, the chemical properties are stable, and the method is applicable to long-time separating operation; excessive swelling of the membrane can be overcome, hydrophilicity of the membrane is guaranteed, and the membrane has high permeation flux and separation factors.

Description

technical field [0001] The invention belongs to the field of membrane separation, and in particular relates to a polyvinyl alcohol crosslinked membrane using a diene compound as a crosslinking agent and a preparation method thereof. Background technique [0002] Pervaporation membrane separation technology is mainly used in the three major fields of organic solvent dehydration, removal of trace organic matter in water and separation of organic mixtures. The currently recognized separation mechanism is that the components in the liquid mixture are separated under the push of pressure due to their different dissolution rates and diffusion rates in the membrane. Compared with traditional rectification, extraction and adsorption, pervaporation membrane separation technology has the advantages of high separation efficiency, low energy consumption and convenient operation. At present, pervaporation separation technology is mainly used in the dehydration of organic solvents, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/38B01D69/12B01D71/68B01D71/42B01D67/00
Inventor 张林王培发李俊俊胡腊梅
Owner CHINA PETROCHEMICAL CORP
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