Chlorine-resistant polyamide composite reverse osmosis membrane and preparation method thereof

A technology of chlorine-resistant polyamide and reverse osmosis membrane, applied in the field of separation membrane, can solve problems such as poor chlorine resistance, and achieve the effects of excellent chlorine resistance, cheap raw materials and simple synthesis process

Inactive Publication Date: 2019-04-19
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defect of poor chlorine resistance of existing reverse osmosis membranes, the present invention provides a chlorine-resistant polyamide composite reverse osmosis membrane with excellent chlorine resistance and desalination rate and a preparation method thereof

Method used

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  • Chlorine-resistant polyamide composite reverse osmosis membrane and preparation method thereof
  • Chlorine-resistant polyamide composite reverse osmosis membrane and preparation method thereof
  • Chlorine-resistant polyamide composite reverse osmosis membrane and preparation method thereof

Examples

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Embodiment 1

[0032] Embodiment 1 Preparation of MPD / TMC / IPC chlorine-resistant reverse osmosis membrane

[0033] The preparation process of the IPC-terminated MPD / TMC membrane is similar to that of the MPD / TMC reverse osmosis membrane in Comparative Example 1. The difference is that immediately after the n-hexane solution cleaning treatment, 100mL n-hexane solution containing 2wt% IPC was poured on the membrane surface again to carry out the secondary interfacial polymerization reaction. After standing and soaking for 5 minutes, pour out the solution again, and rinse the surface with fresh n-hexane to remove unreacted acid chloride monomers. Finally, the MPD / TMC / IPC chlorine-resistant reverse osmosis membrane was air-dried and stored in deionized water for testing.

Embodiment 2

[0034] Embodiment 2 Preparation of MPD / TMC / BC chlorine-resistant reverse osmosis membrane

[0035] The preparation process of the BC-capped MPD / TMC membrane is similar to that of the MPD / TMC reverse osmosis membrane in Comparative Example 1. The difference is that 100 mL of n-hexane solution containing 3wt% BC was immediately poured on the surface of the membrane after the n-hexane solution was cleaned to carry out the secondary interfacial polymerization reaction. After standing and soaking for 10 minutes, pour out the solution again, and rinse the surface with fresh n-hexane to remove unreacted acid chloride monomers. Finally, the MPD / TMC / BC chlorine-resistant reverse osmosis membrane was air-dried and stored in deionized water for testing.

Embodiment 3

[0036] Embodiment 3 Preparation of MPD / TMC / TMC chlorine-resistant reverse osmosis membrane

[0037] The preparation process of the TMC-capped MPD / TMC membrane is similar to that of the MPD / TMC reverse osmosis membrane in Comparative Example 1. The difference is that immediately after the n-hexane solution cleaning treatment, 100mL n-hexane solution containing 1.5wt% TMC was poured on the membrane surface again to carry out the secondary interfacial polymerization reaction. After standing and soaking for 10 minutes, pour out the solution again, and rinse the surface with fresh n-hexane to remove unreacted acid chloride monomers. Finally, the MPD / TMC / TMC chlorine-resistant reverse osmosis membrane was air-dried and stored in deionized water for testing.

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Abstract

The invention discloses a chlorine-resistant polyamide composite reverse osmosis membrane and a preparation method thereof. The chlorine-resistant polyamide composite reverse osmosis membrane is prepared by immersing a polyamide reverse osmosis membrane in an active acyl chloride reactant solution with the concentration of 1 wt%-4 wt%, oscillating for reaction, carrying out secondary interfacial polymerization and forming a polyamide separation layer structure completely terminated by carboxyl groups. The chlorine-resistant polyamide composite reverse osmosis membrane overcomes the shortcomingof poor chlorine resistance of a conventional commercial reverse osmosis membrane, and the obtained composite reverse osmosis membrane has good salt rejection and chlorine resistance, can still maintain the rejection rate of more than 90% of NaCl under the chlorination condition of 30,000 ppm.h, can work for a long time under the condition of residual chlorine, and has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of separation membranes, relates to a reverse osmosis membrane and a preparation method thereof, in particular to a chlorine-resistant polyamide composite reverse osmosis membrane and a preparation method thereof. Background technique [0002] With the deterioration of water resources, the shortage of water resources has become a global problem. As one of the economical and efficient technologies for seawater desalination and brackish water desalination, reverse osmosis technology has a good market application prospect. The reverse osmosis membrane material is the core of this technology, and its long-term performance stability is related to the normal operation of a membrane water treatment system. [0003] In the actual application of seawater desalination engineering, the composition of seawater is complex. Although pretreatment such as ultrafiltration is performed on the water body, the seawater desalin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D69/02B01D67/00B01D71/56C02F1/44
CPCB01D67/0006B01D69/02B01D69/10B01D69/12B01D71/56C02F1/441
Inventor 张轩姚宇健王连军周卫东周克梅刘煜
Owner NANJING UNIV OF SCI & TECH
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