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Polyamide composite reverse osmosis membrane with high flux and high rejection rate and preparation method thereof

A technology of reverse osmosis membrane and polyamide, which is applied in the field of membrane separation and can solve the problems of the influence of salt rejection rate and the reduction of desalination rate.

Active Publication Date: 2021-03-26
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above can increase its water flux, but have a negative impact on the salt rejection rate and reduce the salt rejection rate

Method used

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  • Polyamide composite reverse osmosis membrane with high flux and high rejection rate and preparation method thereof

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Embodiment 1

[0038] This embodiment discloses a method for preparing a polyamide composite reverse osmosis membrane with high flux and high rejection rate, comprising the following steps:

[0039] 1) Preparation of nanofiber membrane: take the PVA-co-PE nanofiber suspension and coat it on the surface of PP, and the quality of the prepared nanofiber membrane is 30g / m 2 .

[0040] 2) Preparation of aqueous phase solution: 0.05% by mass of sodium dodecylsulfonate, 0.1% by mass of camphorsulfonic acid, 0.1% by mass of triethylamine and 0.1% by mass of m-phenylenediamine monomer, were dissolved into In deionized water, a mixed solution is obtained, and 2% urea by mass percentage is also added in the mixed solution as a cosolvent to prepare an aqueous phase solution;

[0041] 3) Prepare an oil phase solution: Dissolve trimesoyl chloride monomer in n-hexane to prepare an oil phase solution with a mass percentage of 0.01%;

[0042] 4) Preparation of polyamide composite reverse osmosis membrane: ...

Embodiment 2

[0044] 1) Preparation of nanofiber membrane: take the PVA-co-PE nanofiber suspension and coat it on the surface of PP, and the quality of the prepared nanofiber membrane is 50g / m 2 .

[0045] 2) Prepare the aqueous phase solution: take sodium dodecylsulfonate as 1% by mass, 5% by mass of camphorsulfonic acid, 4% by mass of triethylamine and 5% by mass of m-phenylenediamine monomer, dissolve to In deionized water, a mixed solution was obtained, and 5% p-aminobenzoic acid was added in the mixed solution as a cosolvent by mass percentage to prepare an aqueous phase solution;

[0046] 3) Prepare an oil phase solution: Dissolve trimesoyl chloride monomer in n-hexane to prepare an oil phase solution with a mass percentage of 5%;

[0047]4) Preparation of polyamide composite reverse osmosis membrane: take the nanofiber membrane prepared in step 1) and immerse it in the aqueous phase solution of step 2) to react for about 10 minutes, remove excess aqueous phase solution, and then add...

Embodiment 3

[0049] 1) Preparation of nanofiber membrane: take the PVA-co-PE nanofiber suspension and coat it on the surface of PP, and the quality of the prepared nanofiber membrane is 80g / m 2 .

[0050] 2) Preparation of aqueous phase solution: take sodium dodecylsulfonate mass percentage as 0.2%, camphorsulfonic acid mass percentage 2%, triethylamine mass percentage 1% and m-phenylenediamine monomer mass percentage as 2% and dissolve into In deionized water, a mixed solution was obtained, and 8% salicylic acid was added in the mixed solution as a cosolvent by mass percentage to prepare an aqueous phase solution;

[0051] 3) Prepare an oil phase solution: Dissolve trimesoyl chloride monomer in n-hexane to prepare an oil phase solution with a mass percentage of 3%;

[0052] 4) Preparation of polyamide composite reverse osmosis membrane: take the nanofiber membrane prepared in step 1) and immerse it in the aqueous phase solution of step 2) to react for about 10 minutes, remove excess aque...

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Abstract

The invention discloses a high-flux high-retention rate polyamide composite reverse osmosis membrane and a preparation method thereof and belongs to the technical field of membrane separation. According to the preparation method, an interface polymerization reaction is implemented on a water phase monomer and an oil phase monomer on the surface of a nano fiber membrane, a cosolvent for promoting uniform distribution of the water phase monomer and the oil phase monomer in nano fiber gaps is put into a water phase solution, the pressure intensity of the obtained polyamide composite reverse osmosis membrane is far smaller than 100 psi, the flux of the polyamide composite reverse osmosis membrane is 50 L / (m<2>*h) or greater, and the salt retention rate of the polyamide composite reverse osmosis membrane is 95% or higher.

Description

technical field [0001] The invention relates to a reverse osmosis membrane, which belongs to the technical field of membrane separation, in particular to a polyamide composite reverse osmosis membrane with high flux and high rejection rate and a preparation method thereof. Background technique [0002] As an important part of membrane separation technology, reverse osmosis membrane can intercept all ions, colloidal particles, organic matter and bacteria, and only allow water to pass through. It is an important part of membrane separation technology, and because of high water production, Environmentally friendly and low cost, it has become the most economical means for seawater and brackish water desalination, pure water and ultrapure water preparation. [0003] The driving force of the reverse osmosis membrane is the pressure difference, which is an operation to separate the solvent from the solution. Pressure is applied on one side of the membrane. Only when this pressure e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/40B01D69/12B01D67/00B01D61/02C02F1/44
CPCB01D61/025B01D67/0006B01D69/125B01D71/40C02F1/441
Inventor 王栋李峥刘轲李沐芳李瑞鹏
Owner DONGHUA UNIV
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