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Method for preparing acid-proof polysulfonamide nanofiltration composite film

The technology of sodium polysulfonamide and polysulfonamide is applied in the field of acid-resistant polysulfonamide nanofiltration composite membrane and its preparation, which can solve the problems of restricting the application of nanofiltration composite membrane, and achieve the effects of superior acid resistance and simple preparation method.

Active Publication Date: 2011-07-13
HANGZHOU FANGRAN MEMBRANE TECH
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Problems solved by technology

[0012] At present, most commercially produced and industrially applied nanofiltration composite membranes are prepared by interfacial polymerization between polyamines and polyacid chlorides. The desalination functional layer of nanofiltration composite membranes is polyamide materials. Under certain conditions, hydrolysis will occur, which restricts the application of nanofiltration composite membranes in some acidic conditions

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[0027] The implementation of the present invention is described in detail below:

[0028] The following examples give descriptions of acid-resistant polysulfonamide nanofiltration composite membranes and their separation properties. However, these examples are provided only by way of illustration and not limitation of the present invention.

[0029] Preparation of porous support membrane: 13.5% of Udel PS3500 LCD polysulfone, 0.2% of water and 0.1% of surfactant were dissolved in N, N-dimethylacetamide, scraped on the polypropylene non-woven fabric, and then Immerse the gel in water, and remove the solvent to obtain a supported membrane with a molecular weight cut-off (MWCO) of about 80,000; the surfactant therein includes at least alkylphenol polyoxyethyl ester phosphate, or sodium dodecylsulfonate, or alkane One of the base phenol polyoxyethyl ester phosphates.

[0030] Preparation of nanofiltration composite membrane: immerse the wet polysulfone support membrane in the po...

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Abstract

The invention relates to a method for preparing a polymer separating film, and in particular relates to a method for preparing an acid-proof polysulfonamide nanofiltration composite film, wherein a polysulfonamide ultra-thin functional separating layer is condensed and compounded through an interface between heterocyclic polyamine and poly-naphthalene sulfonyl chloride on a porous support film according to certain processing steps by controlling certain technological conditions. The method has the following advantages: the selective separating performance and the penetrating quality of the nanofiltration composite film are not lower than those of the existing polysulfonamide nanofiltration composite film; moreover, the acid resistance is superior; and simultaneously, the preparation method is relatively simple. The acid-proof polysulfonamide nanofiltration composite film can be widely applied to the separation of various types of liquids, specifically the separation of acid industrial fluids; and the method is wide in application.

Description

technical field [0001] The invention relates to a polymer separation membrane, in particular to an acid-resistant polysulfonamide nanofiltration composite membrane and a preparation method thereof. technical background [0002] Nanofiltration membrane is a new type of separation membrane with a pore size between reverse osmosis membrane and ultrafiltration membrane. Due to its nano-scale membrane pore size and multiple charges on the membrane, it allows low-molecular salts to pass through and intercepts higher-molecular-weight organic substances. and multivalent ions, with unique separation performance and higher separation accuracy. Compared with other separation membranes, nanofiltration membranes have the characteristics of larger membrane flux, low process osmotic pressure, selective separation of ions, low operating pressure, and low power requirements of the system. At present, nanofiltration membrane technology has been widely used in water softening and brackish wat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/56B01D67/00
Inventor 赵经纬丁国良俞三传王炎锋邱晖
Owner HANGZHOU FANGRAN MEMBRANE TECH
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