Preparation method of composite membrane

A composite membrane and membrane hole technology, applied in the field of separation membranes, can solve the problems of difficulty in reducing the thickness of the composite layer, difficulty in controlling the supply volume and supply speed, difficulty in achieving stable control of the concentration, etc., and achieve lower technical requirements and high removal rate Effect

Active Publication Date: 2020-06-05
吕剑阳
View PDF6 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the porous base film 1 has large pores 8 or the water phase solution and the oil phase solution are unevenly distributed, defects 4 will occur, such as figure 2 , in order to avoid defects, it is necessary to increase the thickness of the composite layer, which makes it difficult to reduce the thickness of the composite layer, making it difficult to further increase the membrane flux
At the same time, as an important factor to control the interfacial polymerization reaction, the supply amount and supply speed of the amine compounds in the aqueous phase solution and the acid chloride compounds in the oil phase solution are not easy to control. Moreover, in industrial production, the aqueous phase solution The concentrations of the amine-containing compounds in the oil phase solution and the acid chloride-containing compounds in the oil phase solution are not easy to achieve stable control
In addition, due to the limitation of the current interfacial polymerization method, currently prepared reverse osmosis membranes and nanofiltration membranes are usually flat membranes that are easy to industrially produce, and it is difficult to obtain hollow fiber reverse osmosis membranes that are easy to industrially produce through interfacial polymerization. Hollow Fiber Nanofiltration Membrane

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 composite membrane
  • Preparation method of composite membrane
  • Preparation method of composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] First, pure water is coated on the permeable side of the polysulfone flat porous base membrane to wet the porous base membrane, and the membrane pores are filled with liquid water, and then continuously coated on the surface (front) of the porous base membrane containing 0.10wt% homogeneous The n-hexane oil phase solution of benzene tricarboxylic acid chloride, the 3rd step, the aqueous phase solution that contains 0.40wt% p-xylylenediamine is coated on the permeation side of porous base membrane continuously for 15 minutes, makes the terephthalic diamine in the aqueous phase solution The amine diffuses into the membrane pores, contacts with the trimesoyl chloride reactive monomer in the oil phase solution at the opening of the membrane pores, and interfacial polymerization occurs, forming a cap-shaped cross-linked layer at the openings of the membrane pores to block the membrane pores , so as to prepare flat reverse osmosis membrane. Under the test pressure of 1.5MPa, ...

Embodiment 2

[0047] Using 0.08wt% concentration of trimesoyl chloride in n-hexane oil phase solution, 0.20wt% concentration of p-xylylenediamine, and other preparation conditions Example 1, a flat reverse osmosis membrane was prepared. Under the test pressure of 1.5MPa, the rejection rate of 1000mg / L sodium chloride aqueous solution is 98%, and the pure water membrane flux is 38L / m2.h. Compared with Example 1, the concentration of the reaction monomer is reduced, and the membrane flux is further improved.

Embodiment 3

[0049] First, pure water is coated on the permeable side of the polysulfone flat porous base membrane to wet the porous base membrane, and the membrane pores are filled with liquid water, and then continuously coated on the surface (front side) of the porous base membrane containing 0.08wt% homogeneous The n-hexane oil phase solution of trimellitic acid chloride, the 3rd step, the water phase solution that contains 0.25wt% piperazine is continuously coated on the permeation side of the porous base membrane, the piperazine in the water phase solution is diffused into the membrane hole, in The openings of the membrane pores are in contact with the trimesoyl chloride reactive monomer in the oil phase solution, interfacial polymerization occurs, and a cap-shaped cross-linked layer is formed at the openings of the membrane pores to block the membrane pores, thereby preparing a flat nanofiltration membrane. Under the test pressure of 0.3MPa, the rejection rate of 1000mg / L sodium sul...

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

No PUM Login to view more

Abstract

The invention relates to a preparation method of a composite membrane, which comprises the following steps: respectively introducing an oil-phase reaction monomer and a water-phase reaction monomer participating in a polymerization reaction from two sides of a porous base membrane, and contacting at openings of membrane holes through the membrane holes to cause an interfacial polymerization reaction. The concentrations and the supply amounts of the two reaction monomers are convenient to control, the reaction speeds and the reaction degrees of the two reaction monomers can be respectively controlled, and the bottleneck of the prior art is broken through, so that the aggregation state structure of the cross-linking layer is easy to regulate and control, and the composite membrane with a higher removal rate is obtained.

Description

technical field [0001] The invention belongs to the field of separation membranes, and relates to reverse osmosis membranes and nanofiltration membrane preparation technologies, in particular to a preparation method of composite membranes. Background technique [0002] Most of the currently commercialized reverse osmosis membranes and nanofiltration membranes are composite membranes. A very thin composite layer is constructed on the surface of the porous base membrane, and the composite layer provides the selective separation function of the composite membrane. In the prior art, the interfacial polymerization reaction between the reactive monomers in the oil phase and the reactive monomers in the water phase is used to form a dense composite layer with a separation function that is not easy to fall off on the membrane surface. In order to increase the membrane flux, it is necessary to minimize the thickness of the composite layer. In order to improve the selective separatio...

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): B01D67/00B01D69/12B01D61/14B01D61/36B01D53/22B01D69/00B01D69/04B01D69/06B01D69/08B01D71/16B01D71/26B01D71/30B01D71/34B01D71/36B01D71/42B01D71/68
CPCB01D69/12B01D69/125B01D61/145B01D53/228B01D61/362B01D2323/30B01D71/68B01D71/42B01D71/30B01D71/34B01D71/26B01D71/36B01D71/16B01D69/08B01D69/06B01D69/04B01D69/00
Inventor 吕剑阳
Owner 吕剑阳
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