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Nanofiltration compound film and its making method

A manufacturing method and composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of unfavorable removal of negatively charged impurities and unsatisfactory results, and achieve low production cost and good industrial production Basic, easy-to-get effects

Inactive Publication Date: 2003-03-26
杜润红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is unfavorable or unsatisfactory to remove negatively charged impurities. In particular, it has not been found that someone uses cheap, easy to obtain, and positively charged, but easily soluble polyacrylate aminoester polymers to make nanofiltration composite membranes. Research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Synthesis process: use dimethylaminoethyl methacrylate monomer as raw material, remove the polymerization inhibitor by activated carbon adsorption, and then carry out bulk polymerization with azobisisobutyronitrile as the initiator to make polymethylaminoethyl methacrylate Dimethylaminoethyl acrylate (PDM);

[0019] (2) ultrafiltration refining process: get the PDM of gained to make the aqueous solution that solid content is 8% (w / v), 150ml; Carry out ultrafiltration refining treatment, ultrafiltration membrane molecular weight cut-off is 10,000, and initial filtrate conductance is 1.89×10 4 μs / cm, while adding pure water, wash and filter, and keep the volume of the feed liquid unchanged; when the total volume of the filtrate is 1000ml, the conductivity of the filtrate drops to 8μs / cm, at this time, the solid content of the polymer is about 7% (w / v), complete refining;

[0020] (3) Coating process: use the refined PDM to prepare a 1% (w / v) aqueous solution, use a ...

Embodiment 2

[0024] (1) Synthetic process: choose dimethylaminoethyl acrylate monomer as raw material, synthetic process is the same as embodiment 1, obtains polydimethylaminoethyl acrylate;

[0025] (2) ultrafiltration refining process: get the obtained polydimethylaminoethyl acrylate to make a solid content of 6% (w / v) aqueous solution, 150ml; carry out ultrafiltration refining treatment, ultrafiltration membrane molecular weight cut-off is 20,000, The initial conductivity of the filtrate was 9.6×10 3 μs / cm; when the total volume of the filtrate was 1000ml, the conductance of the filtrate was reduced to 8 μs / cm, and the solid content of the polymer was about 3.6% (w / v), all the same as in Example 1;

[0026] (3) Coating process: Use refined polydimethylaminoethyl acrylate to prepare a 2% (w / v) aqueous solution, use a polysulfone ultrafiltration membrane with a molecular weight cut-off of 50,000 as the membrane substrate, and soak on one side at room temperature Apply for 1 hour, the res...

Embodiment 3

[0030] (1) Synthetic process: choose diethylaminoethyl methacrylate monomer as raw material, synthetic process is the same as embodiment 1, obtains polydiethylaminoethyl methacrylate;

[0031] (2) ultrafiltration refining process: get the polydiethylaminoethyl methacrylate of gained to make solid content and be 150ml of the aqueous solution of 2% (w / v); 6.8×10 2 μs / cm; when the total volume of the filtrate was 1200ml, the conductance of the filtrate was reduced to 5.4 μs / cm, and at this moment, the solid content of the polymer was about 1.6% (w / v), and the remainder was the same as in Example 1;

[0032] (3) Coating process: configure 1% (w / v) aqueous solution with refined polydiethylaminoethyl methacrylate, and use a hollow fiber polysulfone ultrafiltration membrane with a molecular weight cut-off of 20,000 as the membrane matrix. Dip coating at room temperature for 1 hour, all the same as in Example 1;

[0033] (4) Interface cross-linking process: the dried coating film wa...

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Abstract

The present invention relates to a nano filtration composite membrane and its preparation method. The membrane base body of said membrane is an ultrafiltration membrane, and it is characterized by that the surface layer of said membrane is made of polyacrylic amino ester polymer, and said surface layer has cross-linked net-like compact structure. Its preparation method includes the synthesis process, refining process, membrane-coating process and cross-linking process in turn. Said invention nano filtration composite membrane possesses higher removing rate for inorganic salt, can be up to 40-92%, and its water flux can be up to 10-95 l / sq.m h. Its raw material is easily available, and its production cost is low.

Description

(1) Technical field [0001] The invention relates to membrane technology, specifically a nanofiltration composite membrane and its manufacturing method, and the international patent classification number is intended to be Int.cl 7 .B0lD 69 / 00. (2) Background technology [0002] Nanofiltration composite membrane is a kind of membrane, which generally refers to a membrane with a membrane pore size of 1 to several nanometers. The relative molecular mass cut-off (MWCO) of the nanofiltration composite membrane is in the range of about 100-1000. The nanofiltration composite membrane has a high rejection rate for organic matter and multivalent salts. The interception performance of the nanofiltration composite membrane to salt mainly depends on the electrostatic interaction between the ion and the membrane. [0003] At present, the materials of commercial nanofiltration composite membranes are mainly concentrated in the following types: cellulose acetate (CA), sulfonated polysulf...

Claims

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Application Information

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IPC IPC(8): B01D69/12
Inventor 杜润红赵家森张宇峰杜启云
Owner 杜润红
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