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A negatively charged hybrid forward osmosis hollow fiber membrane and its preparation method

A technology of negatively charged and fiber membranes, which is applied in the field of negatively charged hybrid forward osmosis hollow fiber membranes and its preparation, can solve the problems of poor adhesion of polyamide functional layers, reduced production efficiency, and low space utilization, and achieves Ease of large-scale production and application, enhanced strength, high selectivity effect

Active Publication Date: 2021-11-12
宁波蓝盾新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cortex of the currently prepared forward osmosis membrane is very dense and the water flux is small; the surface of the support membrane is mostly smooth and porous, which makes the adhesion fastness of the polyamide functional layer not high and easy to fall off; the support membrane and the surface polyamide The functional layer needs to be prepared step by step, which reduces production efficiency; and the common forward osmosis membrane is a flat membrane, which has low space utilization

Method used

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preparation example Construction

[0018] As an aspect of the technical solution of the present invention, it relates to a method for preparing a negatively charged hybrid forward osmosis hollow fiber membrane, which includes:

[0019] A first mixed reaction system comprising at least mesoporous nano-silica, dopamine, negatively charged polymer, and a first solvent is provided, the first mixed reaction system is heated and reacted to obtain a negatively charged hybrid material, and the negatively charged hybrid The chemical material and the amine monomer are uniformly dispersed in the aqueous solution to obtain a hybrid aqueous solution;

[0020] providing a second mixed reaction system comprising at least a polymer, a negatively charged monomer, a second solvent and an initiator, heating the second mixed reaction system and reacting to obtain a spinning solution;

[0021] And, co-extruding the spinning solution, the hybrid aqueous phase solution, and the organic phase solution containing acid chloride monomer ...

Embodiment 1

[0060] (1) Add 0.1 g of mesoporous nano-silica with a diameter of 5 nm and a pore size of 1 nm, 0.1 g of dopamine and 2 g of polyacrylic acid into 97.8 g of water to obtain a mixed solution, react at 10°C for 36 hours, and obtain a negatively charged hybrid material ; Disperse 0.1 gram of negatively charged hybrid material and 0.5 gram of m-phenylenediamine in 99.4 grams of aqueous solution to obtain a hybrid aqueous phase solution;

[0061] (2) Mix 16 grams of polysulfone, 2 grams of acrylic acid, 0.01 grams of azobisisobutyronitrile, and 81.99 grams of N-methylpyrrolidone, uniformly heat the mixed solution to 120° C. and react for 0.1 h to obtain a spinning solution;

[0062] (3) Co-extrude the spinning solution, hybrid aqueous phase solution and 0.1wt% n-hexane solution of isophthaloyl chloride through double-layer spinnerets, stay in the air for 0.2 seconds, and then immerse in 0°C, 1wt% aqueous solution , washing, and heat treatment at 25° C. for 30 minutes to obtain a ne...

Embodiment 2

[0065] (1) Add 15 grams of mesoporous nano-silica with a diameter of 70nm and a pore diameter of 10nm, 6 grams of dopamine and 20 grams of polymethacrylic acid into 59 grams of water to obtain a mixed solution, react at 80°C for 0.5h, and obtain a negatively charged Hybrid material; then 10 grams of negatively charged hybrid material and 20 grams of o-phenylenediamine are dispersed in 70 grams of aqueous solution to obtain a hybrid aqueous phase solution;

[0066] (2) Mix 35 grams of polyethersulfone, 20 grams of methacrylic acid, 2 grams of azobisisoheptanonitrile, and 43 grams of N,N'-dimethylformamide, heat the mixed solution to 105°C and react for 9 hours obtain spinning solution;

[0067] (3) Co-extrude the spinning solution, hybrid aqueous phase solution and 20wt% cyclohexane solution of terephthaloyl chloride through double-layer spinnerets, stay in the air for 30 seconds, and then immerse in 80°C, 30wt% apple washing in an acid aqueous solution, and heat treatment at ...

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Abstract

The invention discloses a negatively charged hybrid positive osmosis hollow fiber membrane and a preparation method thereof. The preparation method comprises: dispersing mesoporous nano-silica, dopamine, and a negatively charged polymer in a first solvent to form a first mixed reaction system, heating and reacting to obtain a negatively charged hybrid material, and dissolving the negatively charged hybrid material , the amine monomer is uniformly dispersed in the aqueous solution to obtain a hybrid aqueous phase solution; the polymer, the negatively charged monomer, the second solvent and the initiator are mixed to form a second mixed reaction system, and the reaction is heated to obtain a spinning solution; and, Co-extrude the spinning solution, hybrid aqueous phase solution, and organic phase solution containing acid chloride monomer through a spinneret, and then immerse in a coagulation bath containing a crosslinking agent to crosslink and solidify to form a hollow fiber membrane, and obtain a negatively charged Hybrid forward osmosis hollow fiber membrane. The invention can obtain the forward osmosis hollow fiber membrane with large flux, high selectivity and strong stability, and has simple preparation process and is convenient for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a negatively charged hybrid positive osmosis hollow fiber membrane and a preparation method thereof. Background technique [0002] The forward osmosis process is an important means to achieve seawater desalination emerging in recent years. It is driven by the concentration difference of solutes on both sides of the membrane, without external driving force, saving energy and reducing consumption. Moreover, the concentrated raw material solution can be further processed, and the diluted draw solution can be re-concentrated to extract the pure water in it, and then the concentrated draw solution can be obtained again, so as to realize the recycling of the draw solution, with low operating cost and high added value. [0003] At present, forward osmosis membranes are often flat composite membranes prepared by interfacial polymerization. The classic interfacial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/08B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D69/08B01D71/56B01D2325/14
Inventor 宋维广
Owner 宁波蓝盾新材料科技有限公司