High-throughput polyamide reverse osmosis composite membrane

A reverse osmosis composite membrane and polyamide technology, applied in reverse osmosis, semi-permeable membrane separation, osmosis/dialysis water/sewage treatment, etc. The effect of high water content and simple preparation method

Inactive Publication Date: 2011-07-27
ZHEJIANG SCI-TECH UNIV
10 Cites 15 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0006] In US Patent 4,761,234 in 1988, Uemura et al. used the interfacial polycondensation process to react and compound a layer of aromatic polyamide film on the porous polysulfone support membrane through the interfacial...
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

Method used

Above-mentioned example shows: in the aqueous phase solution containing different aromatic polyamines, add aliphatic macromolecular polyamine polyvinylamine, under the premise that keeps film desalination rate almost constant, can significantly improve by different aromatic polyamines The flux of the reverse osmosis composite membrane m...
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

Abstract

The invention relates to a highly-molecular separation membrane, in particular to a high-throughput polyamide reverse osmosis composite membrane. In the high-throughput polyamide reverse osmosis composite membrane, a polyamide ultra-thin functional layer is compounded on a porous supporting membrane by interfacial polycondensation between water solutions of aromatic polyamine and aliphatic macromolecular polyamine and a solution of aromatic poly-acyl chloride, wherein the aromatic polyamine at least comprises one of metaphenylene diamine, 4-chloro metaphenylene diamine, 4-nitryl metaphenylenediamine and 2,4-diaminotoluene; the aromatic poly-acyl chloride is trimesoyl chloride, 5-isocyanate-isophthaloyl chloride or 5-chloroformloxy-isophthaloyl chloride; and the aliphatic macromolecular polyamine is polyvinylamine. The reverse osmosis composite membrane has the advantages of readily available raw materials, low cost, high desalination rate and high throughput. The novel high-throughput polyamide reverse osmosis composite membrane is wide in application and the preparation method is simple.

Application Domain

Technology Topic

Diamine2,4-Diaminotoluene +15

Image

  • High-throughput polyamide reverse osmosis composite membrane
  • High-throughput polyamide reverse osmosis composite membrane
  • High-throughput polyamide reverse osmosis composite membrane

Examples

  • Experimental program(5)

Example Embodiment

[0041] Examples 1-8
[0042] Dissolved in N,N-dimethylformamide with 13.5wt% Udel PS3500 polysulfone, 0.2wt% water and 0.1wt% nonylphenol polyoxyethyl ester phosphate, applied to polyester nonwoven , and then immersed in water to remove the solvent to obtain a porous support membrane with a molecular weight cut-off of 100,000-120,000, which is stored in a wet state for later use.
[0043] The wet polysulfone porous support membrane is immersed on one side into an aromatic polyamine (m-phenylenediamine, or 4-chloro-m-phenylenediamine, or 4-nitro-m-phenylenediamine, or 2,4-diphenylene diamine, respectively). Aminotoluene) and aliphatic macromolecular polyamine polyvinylamine (molecular weight = 30,000; degree of aminolysis a = 0.52) in an aqueous solution with a total content of 2.0 wt% for 4 minutes, use a rubber roller to roll the support film surface, and drain the aqueous solution After drying the surface of the support film with nitrogen, it is unilaterally contacted with a 0.08 wt% solution of trimesoyl chloride (TMC) in n-heptane to perform interfacial polymerization for 30 to 40 seconds. The obtained ecological composite film was dried in the air for 2 minutes, and then subjected to two-step heat treatment: the first step was to treat at 50-60°C for 5 minutes, and the second step was to treat at 80-100°C for 8 minutes. Then two-step rinsing is performed: the first step is rinsing in 15wt% methanol aqueous solution at 40-50°C for 40 minutes, and the second step is rinsing in water at 40-50°C for 30 minutes. The prepared reverse osmosis composite membrane was tested with a 1000 mg/l sodium chloride aqueous solution under the conditions of an operating pressure of 225 psi, a temperature of 20 °C, and a pH of 6.8. These examples are to investigate the effect of adding aliphatic macromolecular polyamine polyvinylamine on the properties of films formed from different aromatic polyamines.
[0044] Example
[0045] The above examples show that: adding aliphatic macromolecular polyamine polyvinylamine to the aqueous solution containing different aromatic polyamines can significantly improve the performance of polyamines made from different aromatic polyamines on the premise of keeping the membrane rejection rate almost unchanged. The flux of the reverse osmosis composite membrane.

Example Embodiment

[0046] Examples 9-14
[0047] As in the previous example, according to the above method, an aqueous solution with a total content of m-phenylenediamine and polyvinylamine (molecular weight = 30,000; degree of aminolysis a = 0.52) with a total content of 2.4 wt %, and 0.05 wt % of an aromatic polybasic acid chloride ( The n-heptane solution of trimesoyl chloride (TMC), or 5-isocyanate-isophthaloyl chloride (ICIC), or 5-oxocarbonyl chloride-isophthaloyl chloride (CFIC) was used to prepare reverse osmosis composite membrane. These examples are to investigate the effect of adding aliphatic macromolecular polyamine polyvinylamine on the film-forming properties of different polybasic acid chlorides.
[0048]
[0049] The above example shows that: adding aliphatic macromolecular polyamine polyvinylamine to the aqueous phase solution of aromatic polyamine can significantly improve the reverse osmosis composite formed by different polybasic acid chlorides on the premise of keeping the membrane desalination rate almost unchanged. membrane flux.

Example Embodiment

[0050] Examples 15-21
[0051] As in the previous example, according to the above method, the total content of m-phenylenediamine and polyvinylamine (molecular weight = 30,000; degree of aminolysis a = 0.52) is 1.2 wt%, and different weight ratios of m-phenylenediamine and polyvinylamine are used. Aqueous solution, and 0.12wt% trimesoyl chloride (TMC) in n-heptane to prepare reverse osmosis composite membrane. These examples are to investigate the influence of the weight ratio of aromatic polyamines and aliphatic macromolecular polyamines in the aqueous solution on the film-forming properties.
[0052] Example
[0053] The above example shows that high-flux reverse osmosis composite membrane can be obtained by adding aliphatic macromolecular polyamine polyvinylamine to the aqueous phase solution of aromatic polyamine, but the excessive content of polyvinylamine will lead to the decrease of membrane desalination rate.
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

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
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

Similar technology patents

Method for synthesizing hydrophile amino silicon oil

InactiveCN101503515AImprove hydrophilicityImprove washabilityFibre treatmentSiloxaneAminal
Owner:深圳天鼎新材料有限公司

Classification and recommendation of technical efficacy words

  • Increase water flux
  • Improve hydrophilicity

Compositions and methods for enhancing transport through mucus

InactiveUS20100215580A1Reduce mucoadhesivenessImprove hydrophilicityBiocidePowder deliveryChemistryRespiratory mucus
Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
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