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Polyamide composite membrane, preparation method thereof and membrane element

A composite membrane and polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficult to break through cost control bottlenecks

Active Publication Date: 2021-05-11
HUNAN OVAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional preparation method has the following defects: 50% of the production cost of the polyamide composite film comes from the non-woven fabric, and it is difficult to break through the bottleneck of cost control without changing the reinforcement layer

Method used

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  • Polyamide composite membrane, preparation method thereof and membrane element
  • Polyamide composite membrane, preparation method thereof and membrane element
  • Polyamide composite membrane, preparation method thereof and membrane element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of polyamide composite film 2, see for details figure 1 , including a substrate 2.1 and a polyamide layer 2.2 arranged in sequence; the substrate is composed of fresh water separators and polysulfone materials, and the polyamide layer is prepared on the surface of the substrate by interfacial polymerization of polyamines and polyacyl chlorides made. The SEM picture of the fresh water separation net is detailed in figure 2 , can be purchased from the prior art.

[0030] The preparation method of the polyamide composite membrane of the present embodiment may further comprise the steps:

[0031] Prepare the solution, specifically:

[0032] Dissolve 210g of polysulfone particles into 790g of N,N-dimethylformamide (DMF) and mix to form 1000g of polysulfone solution with a viscosity of about 3200cps. During the dissolution process, stir at a stirring speed of 400 rpm. The dissolution temperature The temperature is 75°C, and the dissolution time is 6 hours. After t...

Embodiment 2-8

[0042] The preparation process of Examples 2-8 is carried out with reference to the steps in Example 1, and the difference from Example 1 is in Table 2.

[0043] The different solution viscosities corresponding to different polysulfone concentrations are listed in Table 1:

[0044] Table 1 The solution viscosity corresponding to the concentration of polysulfone solution (25 ℃ test value)

[0045] Polysulfone Concentration (%) 15％ 16％ 17％ 18％ 19％ 20％ 21％ 22％ 23％ Corresponding viscosity cps 425 708 789 1089 1556 2196 3193 4399 5738

Embodiment 9

[0059] Adopt the polyamide composite membrane prepared by embodiment 6, make effective membrane area be 0.5m 2 , a separation membrane element with an outer diameter of 1.8 inches and a length of 12 inches. Structural diagram such as image 3 As shown, the specific method is:

[0060] Fold a piece of polyamide composite membrane 2 in half to form a polyamide composite membrane facing oppositely; fix the short sides of the polyamide composite membrane on the outer wall of the central tube 1 by pasting the two pages; The raw water flow path (circulation raw water 4) is formed between the fronts of the polyamide composite sheet, and the reverse side of the polyamide composite membrane in a single polyamide composite membrane or adjacent two polyamide composite membranes A water outlet channel (circulating water production 6 ) is formed between the membrane pieces, and the water outlet channel communicates with the pure water channel hole; finally, a sealing tape 5 is used for f...

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Abstract

A disclosed polyamide composite membrane comprises a base material and a polyamide layer which are arranged in sequence, the base material is formed by compounding a fresh water separation net and a polysulfone material, and the polyamide layer is prepared on the surface of the base material through interfacial polymerization reaction of polyamine and polyacyl chloride. According to the polyamide composite membrane provided by the invention, traditional non-woven fabric is replaced by a fresh water separation net material, the effect of providing basic mechanical strength for the composite membrane is achieved, due to mature industrial development, the production cost of the polyamide composite membrane is reduced by 30%-50% compared with that of the traditional polyamide composite membrane, the production cost of the polyamide composite membrane is greatly reduced, and the fresh water separation net material has the advantages of being adjustable in thickness, warp and weft density and strength and high in applicability. The invention also discloses a preparation method of the polyamide composite membrane, which is suitable for industrial production. The invention further discloses a membrane element which contains the polyamide composite membrane, can be made into a spiral wound membrane element and is wide in application field.

Description

technical field [0001] The invention relates to the technical field of membrane making, in particular to a polyamide composite membrane, a preparation method thereof and a membrane element. Background technique [0002] Polyamide composite membranes have the advantages of high rejection rate, large flux, good chemical stability, wide pH value, and low operating pressure requirements. Therefore, polyamide composite membranes have attracted more and more attention from researchers. [0003] The preparation method of the traditional polyamide composite membrane (often used as reverse osmosis membrane and nanofiltration membrane) is: first scrape and coat a layer of polysulfone solution on a polyester non-woven fabric with suitable air permeability, and then pass through sol-gel and heat treatment. Finally, a polysulfone-based membrane is obtained, and then a layer of polyamide layer is formed through the interfacial polymerization reaction of polyamine solution and polyacyl chl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D69/00C02F1/44
CPCB01D69/12B01D67/0009B01D67/0018B01D69/00C02F1/442C02F1/444
Inventor 彭博路宏伟胡群辉喻慧廖骞贺妍博彭军
Owner HUNAN OVAY TECH CO LTD
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