Application of hollow fiber braided tube, hollow fiber desalination membrane and preparation method thereof

A technology of desalting membrane and braided tube, which is applied in the field of membrane separation, can solve the problems of uneven coating of the ultrafiltration membrane forming system, easy trapping in the desalting membrane of the separator, and desalination rate of the defective desalting membrane, etc., and achieves improved mechanical properties and regular surface Effect of smoothing and reducing film defects

Active Publication Date: 2020-02-07
TIANJIN MOTIMO MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Non-woven fabrics are made by spraying oriented or random fibers. There are a large number of non-oriented fibers on the surface of non-woven fabrics. Due to tension and other reasons, uneven coating or even no coating of the ultrafiltration membrane-forming system will be formed around the non-oriented fibers, and defects will be formed in the subsequent preparation of the interface functional layer; The mesh support layer is made into a roll-type membrane module, and under the influence of high operating pressure, the mesh inside the module is easy to sink into the desalination membrane, resulting in the formation of defects in the desalination membrane and the overall desalination rate of the desalination membrane decreases

Method used

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  • Application of hollow fiber braided tube, hollow fiber desalination membrane and preparation method thereof
  • Application of hollow fiber braided tube, hollow fiber desalination membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The braided tube (made of polyethylene terephthalate) treated by singeing process was selected to be coated with polyvinylidene fluoride ultrafiltration membrane as the base membrane, and one side of the treated base membrane was immersed in m-phenylenediamine aqueous solution (mass concentration 2.5%), fully contact with trimesoyl chloride / n-hexane solution (mass concentration 1.5%) after draining, perform interfacial polymerization reaction, and finally perform heat treatment, wash away residual reactants with deionized water to obtain low-defect hollow fiber desalination membrane. After the membrane is treated, its desalination rate is tested, and the results show that when the singeing process is used as the base lining, the desalination rate reaches 99%.

Embodiment 2

[0041] Select the braided tube (polytetrafluoroethylene) treated by the singeing process to coat the polyethersulfone ultrafiltration membrane as the base membrane, immerse the treated base membrane on one side in the piperazine aqueous solution (mass concentration 5%) to fully contact, After draining, carry out interfacial polymerization reaction with trimesoyl chloride / n-hexane solution (mass concentration: 3%), and finally perform heat treatment, and wash away residual reactants with deionized water to obtain a low-defect hollow fiber desalination membrane. After the membrane is treated, it is tested that its desalination rate is 98%. The hollow fiber desalination membrane module was prepared by using the hollow fiber desalination membrane, and the module was continuously filtered with 2g / L MgSO4 solution at 10MPa for 10 hours, and then the desalination rate of the module was tested, and the desalination rate reached 96%.

[0042] Comparative Example 1

[0043] Select the co...

Embodiment 3

[0047] The braided tube (polyacrylonitrile) treated by singeing process is selected to be coated with polyvinyl chloride ultrafiltration membrane as the base membrane, and one side of the treated base membrane is immersed in diethylenetriamine aqueous solution (mass concentration 0.1%) to fully contact , after draining, carry out interfacial polymerization reaction with trimesoyl chloride / n-hexane solution (mass concentration 0.05%), and finally perform heat treatment, and wash away residual reactants with deionized water to obtain a low-defect hollow fiber desalination membrane. The desalination rate was tested after the membrane was treated, and the results showed that the desalination rate reached 98% when the braided pipe treated with singeing process was used as the base lining.

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Abstract

The invention provides uses of a hollow fiber braiding pipe, and a hollow fiber desalination film and a preparation method thereof, particularly a hollow fiber braiding pipe reinforcing type desalination film obtained by using the hollow fiber braiding pipe. The preparation method comprises: (1) adopting a hollow fiber braiding pipe as a base lining, carrying out high temperature singeing treatment, removing disordered fibers from the braiding pipe surface, and preparing a hollow fiber ultra-filtration film by coating a polymer on the surface; and (2) forming an ultra-thin desalination layer (interface polymerization function layer) on the surface of the hollow fiber ultra-filtration film by using an interface polymerization method through a polyamine aqueous solution and a polyacyl chloride organic solution. According to the present invention, the obtained hollow fiber desalination film is a low-defect film, wherein the utilization rate of the film can be effectively improved, the additional economic cost caused by the film defect can be reduced, a certain positive role is provided in the film preparation and the film application promotion, and the film fiber generates the self-compacting during the use process due to the influence of the high operation pressure, and it is ensured that no defect is generated during the running process.

Description

technical field [0001] The invention relates to the technical field of membrane separation, especially the use of hollow fiber braided tubes, hollow fiber desalination membranes and a preparation method thereof. Background technique [0002] Membrane separation technology, as a new high-efficiency separation technology, has been widely used in chemical industry, environmental protection, electronics, light industry, textile, energy engineering and other fields. Foreign experts even call the development of membrane separation technology "the third industry". revolution". [0003] With the increasingly serious problem of water resources, the status of seawater desalination and wastewater treatment is becoming more and more prominent, so the application of desalination membrane is becoming more and more extensive. Membrane technology is separation and purification at the ionic level. In order to achieve ion-level separation, in addition to the narrow range of membrane pore siz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/08B01D67/00
CPCB01D67/0006B01D69/08
Inventor 胡晓宇孙文挺沈雅琴高旭
Owner TIANJIN MOTIMO MEMBRANE TECH
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