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High-flux and reverse-osmosis composite membrane from eurelon

A technology of reverse osmosis composite membrane and polyamide, which is applied in the field of water separation, can solve the problems such as the difficulty of obtaining phenylenediamine, and achieve the effect of increasing water flux and improving hydrophilicity

Inactive Publication Date: 2006-05-31
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Abstract
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Problems solved by technology

[0007] In US 761,234 in 1988, Uemura et al. used the interfacial polycondensation method to use trimethylene triamine as a crosslinking agent to react with isophthaloyl chloride on a support membrane to compound a layer of aromatic polyamide film, and the desalination rate was greater than 99%, but its Difficult to obtain the phlegmylene triamine used

Method used

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  • High-flux and reverse-osmosis composite membrane from eurelon
  • High-flux and reverse-osmosis composite membrane from eurelon
  • High-flux and reverse-osmosis composite membrane from eurelon

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Embodiment Construction

[0020] The technical solutions of the present invention will be further specifically described below through examples.

[0021] The operating conditions adopted in the present invention are: 2000ppm sodium chloride aqueous solution, the operating pressure is 225psi, and the operating temperature is 25°C. The following examples give a description of the novel reverse osmosis composite membranes and their desalination performance. However, these examples are provided only by way of illustration and not limitation of the present invention.

[0022] The present invention is to dissolve N,N-dimethylacetamide with 16% Udel P3500 polysulfone, 0.3% water and 0.1% surfactant, apply and scrape on the polyester non-woven fabric, then immerse in water to remove solvent Finally, a supported membrane with a molecular weight cut off (MWCO) of about 20,000 was obtained. Wherein the surfactant includes at least one of alkylphenol polyoxyethyl ester phosphate, sodium dodecylsulfonate and alky...

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Abstract

A high-flux composite reverse osmosis polyamide member features that on a supporting polysulfone membrane, there is a functional aromatic polyamide layer which is prepared from aromatic polyamine (the mixture of lentine and 5-sulfonyl lentine) and aromatic polyacyl chloride chosen from sym-phenyltrimethyl acyl chloride, 5-isocyanate-isophthalic chloride, meta-phenyldimethyl acyl chlorid, and their mixture.

Description

technical field [0001] The invention belongs to water separation technology, in particular to a novel polyamide reverse osmosis composite membrane. Background technique [0002] The reverse osmosis composite membrane is to deposit an ultra-thin functional layer on the surface of a microporous support membrane with an appropriate pore size. The deposition methods mainly include surface coating, interfacial polycondensation and in-situ polymerization. Composite membranes have many advantages over asymmetric membranes: it allows each layer to be tailored for optimum performance. The ultra-thin functional layer can be optimized to the ideal permselectivity, and the support membrane can achieve the best strength and pressure tightness. In addition, composite membranes can form ultra-thin films for materials that are difficult to form asymmetric membranes. For example, due to solvent limitations and cross-linked polymers, composite membranes can be formed by in-situ polymerizatio...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12
Inventor 俞三传周勇高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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