Preparation method of nascent state in-situ modified reverse osmosis membrane

An in-situ modification and reverse osmosis membrane technology, which is applied in reverse osmosis, semipermeable membrane separation, chemical instruments and methods, etc., can solve problems such as easy shedding of nanoparticles, difficulty in research and development of new monomers, and secondary pollution of the environment. The effect of reducing defects, enhancing selective permeability, and increasing flux

Inactive Publication Date: 2019-01-15
ZHEJIANG UNIV OF TECH
View PDF8 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some results have been achieved, the problem cannot be solved fundamentally, and the development of new monomers is difficult and costly. Surface modification and addition of nanoparticles are easy to fall off, which will cause secondary pollution to the environment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of nascent state in-situ modified reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Trimelliticoyl chloride is added into n-hexane, stirred and dissolved to form a uniform transparent organic phase, and the mass volume fractions are 0.1% and 0.01%. The m-phenylenediamine was dissolved to prepare an aqueous solution with a mass volume fraction of 2.0% (triethylamine and camphorsulfonic acid adjusted to pH=10, wherein the mass volume fraction of camphorsulfonic acid was 4.0%). Pour the aqueous phase solution on the polysulfone support membrane, let it stand for 5 minutes, then remove the excess aqueous phase, drain until there is no visible water stain on the surface of the membrane, and then pour the organic phase containing 0.1% trimesoyl chloride to react for 30s , then pour out the organic phase to form a nascent reverse osmosis membrane, then pour into the organic phase solution containing 0.01% trimesoyl chloride to modify the reaction in situ for 30s, then pour out the organic phase, and finally put it into an oven to dry to form a film (heat treat...

Embodiment 2

[0024] Add trimesoyl chloride into cyclohexane, stir and dissolve to form a uniform transparent organic phase, with a mass volume ratio of 0.1%. The m-phenylenediamine was dissolved to prepare an aqueous solution with a mass volume fraction of 2.0% (triethylamine and camphorsulfonic acid adjusted to pH=10, wherein the mass volume fraction of camphorsulfonic acid was 4.0%). Pour the aqueous phase solution on the polysulfone support membrane, let it stand for 5 minutes, then remove the excess aqueous phase solution, drain until there is no visible water stain on the surface of the membrane, and then pour into the organic phase containing 0.1% trimesoyl chloride for reaction 30s, then pour out the organic phase to form a nascent reverse osmosis membrane, then pour into the organic phase cyclohexane solution without trimesoyl chloride for in-situ modification reaction for 30s, then pour out the organic phase, and then put it in an oven and dry it into Film (heat treatment temperat...

Embodiment 3

[0027] Without nascent membrane modification, the rest of the operating steps are the same as in Example 1. Under the pressure of 1.55MPa, the permeation flux of the membrane is 45.32(L m -2 h -1 ), the retention rate to sodium chloride is 99.77%. Under the pressure of 5.5MPa, the permeation flux of the membrane is 69.22(Lm -2 h -1 ), the retention rate to sodium chloride is 99.03%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
percent by volumeaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of a nascent state in-situ modified reverse osmosis membrane. The method includes: 1) adding poly-acyl chloride to an alkane solvent with stirring to forma homogeneous and colorless organic phase, and sealing and standing the organic phase; 2) dissolving polyamine to form a water phase solution and regulating pH of the solution to 10; 3) pouring the polyamine water phase solution on a porous support membrane, allowing the solution to stand, and pouring away residual water phase solution, draining the membrane until no naked-eye-visible water spot exists on the membrane; 4) pouring the solution into the poly-acyl chloride organic phase solution to obtain a nascent membrane, and pouring the membrane into poly-acyl chloride organic phase solutions, in different concentrations, for modification reaction; 5) drying the modified nascent state reverse osmosis membrane to shape the membrane. Through regulation on the crosslinking degree of the surface of the nascent state reverse osmosis membrane, defects in the membrane are reduced, surface charge of the nascent membrane is controlled, and selective permeability of the reverse osmosis membraneis effectively enhanced.

Description

technical field [0001] The invention relates to a method for preparing a polymer organic membrane, in particular to a method for preparing a nascent eco-situ modified reverse osmosis membrane. Background technique [0002] Reverse osmosis technology is a low-energy, high-efficiency, green separation technology with simple process, mild operating conditions, and high separation efficiency. It has been widely used in the fields of brackish water, seawater desalination, and wastewater treatment. [0003] The core of the reverse osmosis separation technology is the reverse osmosis membrane, and the aromatic polyamide reverse osmosis composite membrane occupies a dominant position in the market. The aromatic polyamide reverse osmosis composite membrane is a layer of ultra-thin polyamide functional layer compounded on the surface of a porous support membrane with an appropriate pore size through interfacial polycondensation. The interfacial polycondensation composite process deter...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D71/68C02F1/44C02F103/08
CPCB01D61/025B01D67/0006B01D71/68C02F1/441C02F2103/08
Inventor 周勇王书浩高从堦
Owner ZHEJIANG UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap