Unlock instant, AI-driven research and patent intelligence for your innovation.

Positively charged nanofiltration membrane and preparation method thereof

A nanofiltration membrane and positively charged technology, applied in the field of separation membrane, to achieve strong treatment performance, simple preparation method, and high desalination rate

Inactive Publication Date: 2021-05-28
恩泰环保科技(常州)有限公司
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on the market for positively charged nanofiltration membranes for calcium chloride removal, so the preparation method of a positively charged nanofiltration membrane proposed by the present invention has huge commercial potential

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Positively charged nanofiltration membrane and preparation method thereof
  • Positively charged nanofiltration membrane and preparation method thereof
  • Positively charged nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method for a positively charged nanofiltration membrane, comprising the following specific steps:

[0032] (1) Preparation of polymer solution: Add 100.0g of polysulfone to 525.0g of N,N-dimethylformamide (DMF), and stir at 60°C for 6 hours, then let it stand for defoaming for 24 hours, that is obtain a polymer solution;

[0033] (2) Preparation of base film: coating the above-mentioned polymer solution on a non-woven fabric, then performing phase separation in a coagulation bath at 25° C. for 10 seconds, and curing to form a base film;

[0034] (3) Prepare the aqueous phase liquid: dissolve 4.0 g of piperazine in 2000.0 g of deionized water and add 25.0 g of triethylamine, then stir for 30 minutes to obtain the aqueous phase liquid;

[0035] (4) Prepare the oil phase liquid: dissolve 0.4 g of trimesoyl chloride in 200.0 g of Isopar L and stir for 30 minutes to obtain the oil phase liquid;

[0036] (5) Preparation of polyamide selective layer: put the abov...

Embodiment 2

[0039] A preparation method for a positively charged nanofiltration membrane, comprising the following specific steps:

[0040] (1) Preparation of polymer solution: Add 110.0g of polyethersulfone to 525.0g of N,N-dimethylacetamide (DMAc), and stir at 50°C for 5 hours, then stand for defoaming for 20 hours, Promptly obtain polymer solution;

[0041] (2) Preparation of base film: coating the above-mentioned polymer solution on the non-woven fabric, then performing phase separation in a coagulation bath at 35° C. for 5 seconds, and curing to form a base film;

[0042] (3) Prepare the aqueous phase liquid: dissolve 10.0 g of m-phenylenediamine in 2000.0 g of deionized water and add 40.0 g of trisodium phosphate, then stir for 40 minutes to obtain the aqueous phase liquid;

[0043] (4) Preparation of oil phase liquid: 0.2 g of terephthaloyl chloride was dissolved in 200.0 g of Isopar G and stirred for 20 minutes to obtain an oil phase liquid;

[0044] (5) Preparation of polyamide...

Embodiment 3

[0047] A preparation method for a positively charged nanofiltration membrane, comprising the following specific steps:

[0048] (1) Preparation of polymer solution: Add 95.0g of polytetrafluoroethylene to 525.0g of N,N-dimethylformamide (DMF), and stir at 55°C for 4 hours, then let stand for defoaming for 18 hours , to obtain a polymer solution;

[0049] (2) Preparation of base film: coating the above-mentioned polymer solution on a non-woven fabric, then performing phase separation in a coagulation bath at 20° C. for 15 seconds, and solidifying to form a base film;

[0050] (3) Prepare the aqueous phase liquid: dissolve 6.0 g of o-phenylenediamine in 2000.0 g of deionized water and add 60.0 g of triethylamine, then stir for 20 minutes to obtain the aqueous phase liquid;

[0051] (4) Preparation of oil phase liquid: 0.6 g of trimesoyl chloride was dissolved in 200.0 g of Isopar L and stirred for 25 minutes to obtain an oil phase liquid;

[0052] (5) Preparation of polyamide ...

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 discloses a positively charged nanofiltration membrane and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving a polymer, and standing to obtain a polymer solution; (2) coating a supporting material with the polymer solution, performing phase separation in a coagulating bath, and curing to form a base membrane; (3) dissolving a multi-amino compound in water, adding a pH regulator, and stirring to obtain a water-phase liquid; (4) dissolving a multi-element acyl chloride compound in an organic solvent and stirring to obtain an oil phase liquid; (5) soaking the base membrane in the water-phase liquid, airing, polymerizing in the oil phase liquid, and drying to form a polyamide selection layer on the base membrane; and (6) soaking the base membrane with the polyamide selection layer formed on the surface in a mixed solution containing a polyfunctional group amine compound and a cross-linking agent, rinsing, and drying to obtain the positively charged nanofiltration membrane. The nanofiltration membrane prepared by the method disclosed by the invention has different removal rates for monovalent and divalent ions, and particularly has the characteristics of high removal rate for calcium chloride in a test solution and low removal rate for sodium chloride.

Description

technical field [0001] The invention relates to the technical field of separation membranes, in particular to a positively charged nanofiltration membrane and a preparation method thereof. Background technique [0002] As one of the membrane separation technologies, nanofiltration is usually called a nanofiltration membrane with a pore size of about 1 nm. Nanofiltration has special separation performance. Compared with seawater brackish water reverse osmosis membrane driven by high pressure, nanofiltration can partially desalinate but not all. At the same time, the interception of divalent ions is basically comparable to that of reverse osmosis. Organic matter and colloids with a quality of 200-500 can be completely removed; reverse osmosis seawater membranes also require high operating pressure for low-salinity water, while nanofiltration membranes can basically operate normally under low pressure; At the same time, due to the charge on the surface of the nanofiltration me...

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): B01D61/00B01D67/00B01D69/10B01D71/56C02F1/44
CPCB01D61/027B01D67/0006B01D69/10B01D71/56C02F1/442
Inventor 向豪周兴蒙姚科丁伟祥邵杰刘涛
Owner 恩泰环保科技(常州)有限公司