Large-flux low-pressure reverse osmosis membrane preparation method and device

A low-pressure reverse osmosis, high-throughput technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., to simplify the production process, realize stable and continuous production, save space and cost

Active Publication Date: 2021-06-15
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another object of the present invention is to provide a high-throughput low-pressure reverse osmosis membrane preparation device that matches the aforementioned preparation method, so as to solve the problems of reverse osmosis membrane production efficiency and simplification of the preparation process

Method used

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  • Large-flux low-pressure reverse osmosis membrane preparation method and device
  • Large-flux low-pressure reverse osmosis membrane preparation method and device
  • Large-flux low-pressure reverse osmosis membrane preparation method and device

Examples

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Comparison scheme
Effect test

Embodiment 1

[0045] use figure 1 In the reverse osmosis membrane preparation device, the reverse osmosis membrane is prepared according to the following method:

[0046] Coat the polysulfone DMF casting solution with a mass concentration of 16% on the PET support and send it directly into the gel tank containing 1.2% m-phenylenediamine, 0.2% DMF and water, and stay in the gel tank at 30°C for 60s . Use an air knife surface drying device to blow off the excess solution until there are no visible drops of water on the surface, and start to coat 0.11% trimesoyl chloride ISOPARG oil phase monomer solution, which also contains 0.05% tributyl phosphate; After the interface reaction for 30s, dry at 70°C for 1min, then enter two consecutive 50°C pure water rinse tanks for cleaning; 6% glycerin water tank moisturizing treatment for 1min, and finally, send the formed film into a 70°C oven to dry for 2min, and wind up.

Embodiment 2

[0048] The reverse osmosis membrane was prepared according to the method and device in Example 1, the only difference being that the treatment temperature in the gel tank was adjusted to 32°C.

Embodiment 3

[0050] The reverse osmosis membrane was prepared according to the method and device in Example 1, except that the treatment temperature in the gel tank was adjusted to 35°C.

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Abstract

The invention discloses a large-flux low-pressure reverse osmosis membrane preparation method and device, and the method comprises the following steps: coating a non-woven fabric supporting body with a membrane casting solution, feeding the non-woven fabric supporting body into a gel tank containing a water-phase monomer and N, N-dimethylformamide, carrying out gel processing to obtain a basement membrane, blowing off the excess solution in the basement membrane by using an air knife surface drying device, and coating an oil-phase monomer solution to enable the oil-phase monomer solution and a water-phase monomer in the basement membrane to be subjected to an interface reaction to prepare a polyamide membrane; and after the reaction, drying and post-processing the polyamide membrane to prepare a large-flux low-pressure reverse osmosis membrane. According to the method, a casting and coating integrated preparation process is adopted, so that the production process is simplified, the monomer concentration can be accurately controlled, and stable and continuous production is realized; and by further controlling the gel temperature, the preparation of the low-pressure large-flux reverse osmosis membrane with excellent performance is facilitated.

Description

technical field [0001] The invention relates to a preparation method and device, in particular to a preparation method and device for a large-flux low-pressure reverse osmosis membrane. Background technique [0002] Reverse osmosis membranes play an increasingly important role in separation and purification in households and industrial production, and the future application prospects are still very broad. Therefore, the preparation technology of reverse osmosis membrane is becoming more and more important. How to prepare the reverse osmosis membrane needed at present with high efficiency and high quality is a problem that those skilled in the art must face. [0003] The preparation process of the traditional composite reverse osmosis membrane is introduced in the patents US4277344A and US4761234A. First, the non-woven fabric is used as a support, and a layer of 40-60 micron polymer is coated on it to form a substrate through sol-gel phase transformation. Then dip-coat the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/42B01D71/56B01D71/68
CPCB01D61/025B01D67/0002B01D69/12B01D67/0006B01D67/0009B01D67/0011B01D67/0013B01D71/68B01D71/42B01D71/56Y02A20/131
Inventor 张大鹏李宁赵伟国孙家宽
Owner WANHUA CHEM GRP CO LTD
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