Polyamide forward osmosis membrane for water treatment

A forward osmosis membrane, polyamide technology, applied in water/sewage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc. Optimism and other issues, to achieve the effect of reducing the degree of concentration polarization and improving the flux

Active Publication Date: 2018-07-31
杭州水管家环保技术有限责任公司
View PDF7 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The internal concentration polarization that occurs inside the support layer will reduce the membrane permeation driving force
In response to this problem, the method of reducing the thickness of the membrane is generally used to reduce the concentration polarization limit to the greatest extent, but the reduction of the thickness of the support layer will lead to the reduction of the strength of the membrane, and the reduction of the thickness of the separation layer will reduce the selectivity.
Some scholars have also proposed a symmetrical sandwich structure with a double skin layer. This method can reduce the degree of concentration polarization in the membrane by blocking the solute in the raw material solution from entering the support body. However, compared with the traditional forward osmosis membrane, it has an additional layer of separation layer so flux is not optimistic

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Dissolve 20wt% polysulfone in N,N-dimethylacetamide, add 8wt% polyethylene glycol-400, heat and stir to dissolve completely, stand at room temperature for 24 hours to obtain cast Membrane solution, use a scraper to cast the casting solution onto a clean glass plate, let it stand in the air for 12 hours, quickly put it horizontally into the coagulation bath to gel for 1 hour, and then take it out to obtain the polysulfone support layer;

[0025] (2) Dissolve 2wt% piperazine, 0.5wt% m-phenylenediamine, 0.5wt% sodium hydroxide and 0.2wt% sodium dodecylsulfonate in deionized water, stir well to form the first water phase monomer; the pyromellitic acid chloride of 2wt%, the isophthaloyl dichloride of 2wt% are dissolved in the alkane solvent, form the first oil phase monomer after stirring evenly; % sodium hydroxide and 0.2wt% sodium dodecylsulfonate are dissolved in deionized water, and the second aqueous phase monomer is formed after stirring; a certain amount of trimes...

Embodiment 2

[0034] (1) Dissolve 20wt% polysulfone in N,N-dimethylacetamide, add 8wt% polyethylene glycol-400, heat and stir to dissolve completely, stand at room temperature for 24 hours to obtain cast Membrane solution, use a scraper to cast the casting solution onto a clean glass plate, let it stand in the air for 12 hours, quickly put it horizontally into the coagulation bath to gel for 1 hour, and then take it out to obtain the polysulfone support layer;

[0035] (2) Dissolve 2wt% piperazine, 0.5wt% m-phenylenediamine, 0.5wt% sodium hydroxide and 0.2wt% sodium dodecylsulfonate in deionized water, stir well to form the first water phase monomer; the pyromellitic acid chloride of 2wt%, the isophthaloyl dichloride of 2wt% are dissolved in the alkane solvent, form the first oil phase monomer after stirring evenly; % sodium hydroxide and 0.2wt% sodium dodecylsulfonate are dissolved in deionized water, and the second aqueous phase monomer is formed after stirring; a certain amount of trimes...

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 provides a polyamide forward osmosis membrane for water treatment. The composite polyamide forward osmosis membrane with an asymmetric sandwich structure is designed, i.e., a high-throughput polyamide separating layer and a high-selectivity polyamide separating layer are respectively designed on two sides of a polysulfone supporting layer; then the high-selectivity polyamide separating layer is designed into two thin layers; on one thin layer close to the polysulfone supporting layer, dopamine is added into a water-phase monomer, so that the throughout of the whole membrane is improved; water-phase and oil-phase monomer types of the polyamide separating layers on two sides of the polysulfone supporting layer are selected, so that the best performance of the membrane is ensured.

Description

technical field [0001] The present application relates to a forward osmosis membrane, in particular to a polyamide forward osmosis membrane for water treatment. Background technique [0002] In August 2015, the World Resources Institute released the ranking of national water resource stress in 2040. It is expected that China will change from a country with medium water resource stress to a country with extremely high water resource stress. In order to cope with water resource pressure, countries around the world continue to strengthen the field of water treatment Various water treatment technologies have been developed successively, among which technologies such as reclaimed water reuse and seawater desalination are widely used. [0003] As an important supporting technology in the field of water treatment, membrane water treatment technologies such as microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO) have been commercialized after lon...

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
IPC IPC(8): B01D61/00B01D67/00B01D69/02B01D69/10B01D71/56C02F1/44
CPCB01D61/002B01D67/0006B01D69/02B01D69/10B01D69/105B01D71/56B01D2325/36C02F1/445
Inventor 延怀军彭玉忠
Owner 杭州水管家环保技术有限责任公司
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