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Seawater desalination reverse osmosis membrane support and preparation method

A reverse osmosis membrane, seawater desalination technology, applied in chemical instruments and methods, reverse osmosis, seawater treatment, etc., can solve the problems of poor structure and performance stability, increased hydrolysis performance, membrane support shape stability and apparent smoothness Guarantee and other issues, to achieve excellent seawater resistance, strong loss and structural stability, and improve seawater resistance

Active Publication Date: 2019-07-12
FOSHAN S L P SPECIAL MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some documents (Chen Guoqiang, etc., preparation of reverse osmosis membrane support, printing and dyeing auxiliaries [J], 28 (8): 8-10, 2008) and patents [CN102031640B, CN101765456 A, USP5851355] have only reported the use of knitted fabric coating , spun-bonded non-woven materials and wet-laid non-woven materials to prepare the method for separation membrane support body, but this type of support material is all made of polyester fiber, and its structure and performance stability in long-term high-saline alkaline seawater environment are relatively low. Poor, especially at a certain temperature due to the aggravation of the hydrolysis performance of polyester, the morphological stability and apparent flatness of the membrane support are difficult to guarantee

Method used

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  • Seawater desalination reverse osmosis membrane support and preparation method
  • Seawater desalination reverse osmosis membrane support and preparation method
  • Seawater desalination reverse osmosis membrane support and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation of seawater-resistant reverse osmosis membrane support mainly includes the following steps:

[0034] 1. Form a network

[0035] Mix polypropylene fibers (fiber diameter 6.5 μm, fiber length 5 mm), polyvinyl alcohol fibers (fiber diameter 7.2 μm, fiber length 5 mm), and polyethylene fibers (3.2 μm, fiber length 5 mm) at a ratio of 60:20:20 Proportionally disperse in water, control the fiber concentration to 2%, disperse for 40 minutes, put it into the slurry mixing tank, add water and polyacrylamide dispersant and stir evenly, make the concentration 0.03, the viscosity is 60 seconds, and make a slurry; the slurry passes through the inclined screen Forming machine copy forming.

[0036] 2. Dry

[0037] In order to prevent the water-containing polyvinyl alcohol fibers from dissolving during drying, the drying is carried out in two steps. First, the formed fiber web enters the drying cylinder in the first zone for dehydration. In the second zone drying zo...

Embodiment 2

[0041] Other processing procedures and processes are as described in Example 1, adjusting the ratio of polypropylene fiber, polyvinyl alcohol fiber and polyethylene fiber to 50:30:20 to prepare a seawater desalination reverse osmosis membrane support.

Embodiment 3

[0043] Other processing procedures and processes are as described in Example 1, adjusting the ratio of polypropylene fiber, polyvinyl alcohol fiber and polyethylene fiber to 40:40:20 to prepare a seawater desalination reverse osmosis membrane support.

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Abstract

The invention discloses a reverse osmosis membrane support for seawater desalination and a preparation method. The reverse osmosis membrane support comprises, in percentage by weight, 40%-60% of polypropylene fibers serving as main fibers, 20%-40% of polyvinyl alcohol fibers serving as supporting fibers and 10%-30% of binding fibers, and the amount of the reverse osmosis membrane support is determined to be 40g / m<2>-120g / m<2>. According to the high salinity and high alkalinity characteristics of to-be-desalinated seawater, the support is mainly prepared from the polypropylene fibers serving as the main fibers, the polyvinyl alcohol fibers serving as the supporting fibers and ES (ethylene propylene) fibers or polyethylene fibers as the binding fibers which all have excellent seawater resistance in technical steps including proportional blending, beating, net forming through wet-process twill weaving, drying and calendering. The coating of the reverse osmosis membrane support has good smoothness and high flatness, the reverse osmosis membrane support has low strength loss in seawater and good structural stability, can be used in a reverse osmosis membrane for seawater desalination stably for a long time and can be widely used for reverse osmosis membrane assemblies for seawater desalination in different temperature environments, and the production process is simple.

Description

technical field [0001] The invention belongs to the technical field of liquid filtration and separation manufacturing, and in particular relates to a reverse osmosis membrane support body for seawater desalination and a preparation method. Background technique [0002] Since reverse osmosis seawater desalination technology was commercialized in the 1970s, its high efficiency, low energy consumption, cleanliness, less pollution, and convenient operation and management have made it an advanced desalination technology today. After more than 50 years of research, development and industrialization, the performance of reverse osmosis seawater desalination membranes and membrane modules has been greatly improved, with a desalination rate as high as 99.8%, and water production increased by more than 2-3 times. [0003] The research on seawater desalination membranes began in the United States. John E.Cadotte first used m-phenylenediamine and trimesoyl chloride to prepare seawater de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D61/02C02F1/44C02F103/08
CPCY02A20/131
Inventor 李杰郭玉海于斌孙辉王峰来悦周思远
Owner FOSHAN S L P SPECIAL MATERIALS
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