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Hollow fiber compound nanofiltration membrane and preparation method thereof

A fiber composite and nanofiltration membrane technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of not being able to effectively obtain commercially applicable hollow fiber nanofiltration membranes and restrict the application and promotion of nanofiltration membrane technology , Increase user cost and other issues, achieve good industrialization advantages and commercial application prospects, improve working water flux, and stabilize product quality

Inactive Publication Date: 2015-05-13
HUNAN OVAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned existing hollow fiber nanofiltration membrane preparation process has not yet achieved industrialization, nor has it been able to effectively obtain commercially applicable hollow fiber nanofiltration membranes
In addition, the water flux of the nanofiltration membrane prepared by the existing technology is low, which increases the user's use cost and restricts the application and promotion of the nanofiltration membrane technology

Method used

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  • Hollow fiber compound nanofiltration membrane and preparation method thereof

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Effect test

Embodiment 1

[0037] (1) Preparation of casting solution: casting solution is divided into inner layer casting solution and outer layer casting solution, and inner layer casting solution consists of 18wt% polyvinylidene fluoride, 2wt% Tween-80, 10wt% Polyethylene glycol 400, 5wt% lithium chloride and 65wt% N,N-dimethylacetamide are composed; the outer casting solution is composed of 15wt% polyetherimide (molecular weight is 50000), 5wt% magnesium chloride and 80wt% N,N-dimethylacetamide; the casting liquid is stirred evenly at 50°C and subjected to standing defoaming treatment.

[0038] (2) Extrusion molding: the above-mentioned outer layer casting solution and the inner layer casting solution are respectively added to the outer layer and the second outer layer of the spinneret of a core double-layer structure, and the center layer is passed into the core liquid, and the core liquid is The water is extruded and then coagulated in a coagulation bath. The coagulation bath is composed of 80wt%...

Embodiment 2

[0042] (1) Prepare casting solution: casting solution is divided into inner layer casting solution and outer layer casting solution, and inner layer casting solution is composed of 18wt% polyacrylonitrile, 2wt% sorbitan fatty acid ester, 15wt% Polyvinylpyrrolidone, 5wt% lithium nitrate and 60wt% N,N-dimethylformamide; the outer casting solution is composed of 15wt% polyetheretherketone (molecular weight: 100000), 3wt% magnesium sulfate and Composed of 82wt% N,N-dimethylformamide; the casting solution was stirred evenly at 60°C and subjected to static defoaming treatment.

[0043] (2) Extrusion molding: the above-mentioned outer layer casting solution and the inner layer casting solution are respectively added to the outer layer and the second outer layer of the spinneret of a core double-layer structure, and the center layer is passed into the core liquid, and the core liquid is The water is extruded and then solidified in a coagulation bath. The coagulation bath is composed o...

Embodiment 3

[0047] (1) Prepare casting solution: casting solution is divided into inner layer casting solution and outer layer casting solution, inner layer casting solution is made of 22wt% polyvinyl chloride, 5wt% fatty alcohol polyoxyethylene ether, 10wt% Polyethylene glycol 400, 3wt% nano-hydrophobic calcium carbonate and 60wt% N-methylpyrrolidone; the outer casting solution is composed of 18wt% sulfonated polyether ether ketone (molecular weight is 120000), 4wt% lithium nitrate and 78wt% of N-methylpyrrolidone; the casting liquid is stirred evenly at 65° C., and subjected to static defoaming treatment.

[0048] (2) Extrusion molding: the above-mentioned outer layer casting solution and the inner layer casting solution are respectively added to the outer layer and the second outer layer of the spinneret of a core double-layer structure, and the center layer is passed into the core liquid, and the core liquid is The water is extruded and then coagulated and formed in a coagulation bath...

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Abstract

The invention relates to a hollow fiber compound nanofiltration membrane. The nanofiltration membrane takes a porous supporting layer as an inner layer and a separating function layer as an outer layer. A casting membrane solution of the porous supporting layer contains an inner layer macromolecular polymer which is selected from one or more of polysulfone, polyether sulfone, polyvinylidene fluoride, polyvinyl chloride and polyacrylonitrile; a casting membrane solution of the separating function layer contains an outer layer macromolecular polymer which is selected from one or more of polyetherimide, polyether-ether-ketone, sulfonated polyether-ether-ketone, polymethyl methacrylate and polyvinyl alcohol; a preparation method comprises the following steps: synchronously extruding and molding the inner layer casting membrane solution and the outer layer casting membrane solution; solidifying to obtain a membrane filament in a nascent state; and carrying out an oxidizing agent aqueous solution to obtain the hollow fiber compound nanofiltration membrane. The invention further provides the preparation method of the nanofiltration membrane correspondingly. According to the hollow fiber compound nanofiltration membrane provided by the invention, the flux of the nanofiltration membrane is remarkably improved, and moreover, the nanofiltration membrane further has the certain desalinization rate.

Description

technical field [0001] The invention relates to a separation membrane with a polymer material structure and a preparation method thereof, in particular to a hollow fiber composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration (NF) is a pressure-driven membrane separation process between reverse osmosis (RO) and ultrafiltration (UF), and it is one of the fastest-growing membrane separation technologies. It is generally believed that nanofiltration membranes have a pore size of 0.5-2nm, and are often used to separate monovalent salts, divalent salts, and organic compounds with a molecular weight (MWCO) between 200 and 2000. Since nanofiltration membranes can effectively retain small organic molecules, Divalent salts and high-valent salts have better rejection rates and allow monovalent salts to pass through more freely, so that the separation of ions with different valences can be achieved. Since most nanofiltration mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D71/68B01D67/00B01D71/34B01D71/42B01D71/40
Inventor 贺攀路宏伟刘旦彭博胡群辉喻慧王进刘鹏君王纯清陈超刘畅叶明明黄涛刘元利
Owner HUNAN OVAY TECH CO LTD
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