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Device for preparing external pressure type hollow fiber nanofiltration membranes

An external pressure, nanofiltration membrane technology, applied in membrane, membrane technology, semi-permeable membrane separation, etc., can solve the problems of membrane-membrane adhesion, interface polymerization failure, poor performance of hollow fiber nanofiltration membrane, etc. The effect of preparation efficiency, convenient operation and simple structure

Active Publication Date: 2016-11-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the efficiency of preparing external pressure hollow fiber nanofiltration membranes by interfacial polymerization is very low in experiments. Only one hollow fiber ultrafiltration membrane can be operated in one interface polymerization, because two or more hollow fiber ultrafiltration membranes are submerged. In the aqueous phase or organic phase, the membrane and the membrane will stick together, and the surface of the membrane cannot be fully contacted with the solution, so that the interfacial polymerization reaction cannot be fully carried out, which eventually leads to the failure of the interfacial polymerization or the poor performance of the prepared hollow fiber nanofiltration membrane. Unable to meet the experimental requirements

Method used

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  • Device for preparing external pressure type hollow fiber nanofiltration membranes
  • Device for preparing external pressure type hollow fiber nanofiltration membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] refer to figure 1 with figure 2 , a device for preparing an external pressure hollow fiber nanofiltration membrane, the device includes a stainless steel wire support body 1 composed of a stainless steel wire and six ring groups 2 bent by stainless steel wire, the ring Group 2 is arranged along the longitudinal direction of the stainless steel wire support body 1, and there is a certain distance between adjacent ring groups, and the distance between adjacent ring groups is the same, and the distance is 5cm; the ring group 2 It is a petal-shaped structure formed by bending stainless steel wire into four rings, and the centers of the rings with the same upper and lower positions in different ring groups are all on the same straight line, ensuring that the membrane wire can vertically penetrate into it; the stainless steel wire support The body 1 and the ring group 2 are made of a complete stainless steel wire, and the whole device is an integrated structure without inte...

Embodiment 2

[0030] refer to figure 1 with figure 2 , a device for preparing an external pressure hollow fiber nanofiltration membrane, comprising a stainless steel wire support body 1 composed of a stainless steel wire and six ring groups 2 bent by stainless steel wire, and the ring group 2 is formed along the stainless steel wire The longitudinal direction of the wire support body 1 is set, and there is a certain distance between adjacent ring groups, and the distance between adjacent ring groups is the same, and the distance between the adjacent ring groups is 6cm; the ring group 2 is made of stainless steel The wire is bent into a petal-shaped structure formed by four rings, and the centers of the rings with the same upper and lower positions in different ring groups are all on the same straight line, so that the membrane wire can be vertically penetrated into it; the stainless steel wire support body 1 and The ring group 2 is made of a complete stainless steel wire, and the whole de...

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Abstract

The invention discloses a device for preparing external pressure type hollow fiber nanofiltration membranes. The device comprises a stainless steel wire support body and a plurality of ring groups formed by bending a stainless steel wire, wherein the plurality of ring groups are arranged at intervals in the longitudinal direction of the stainless steel wire support body; each ring group has a petaloid structure consisting of a plurality of rings formed by bending the stainless steel wire; centers of the rings in the same vertical position in the adjacent ring groups are located in the same straight line; the stainless steel wire support body and the ring groups are formed by one complete stainless steel wire, and the whole device adopts a joint-free integral structure. A plurality of the hollow fiber nanofiltration membranes are manufactured through one-time interfacial polymerization, and the preparation efficiency is greatly improved; moreover, the prepared external pressure type hollow fiber nanofiltration membranes have basically same performance with a single prepared external pressure type hollow fiber nanofiltration membrane; the device also has advantages of being simple in structure, convenient to operate, low in cost and the like.

Description

technical field [0001] The invention relates to a device for preparing an external pressure hollow fiber nanofiltration membrane. Background technique [0002] Membrane technology is a new type of separation technology, which has developed rapidly in recent decades. Nanofiltration membranes have been widely used in petrochemical, electronics, light industry, textile, metallurgy, food, chemical and other fields. It has the structural characteristics of nanoscale membrane pore size and many charges on the membrane. Its molecular weight cut-off is between 200 and 2000, and it has a high rejection rate for divalent and multivalent ions. Since Cadotte et al first used interfacial polymerization to prepare composite membranes in 1972, interfacial polymerization has been widely used in the field of membrane technology due to its advantages of simple operation and easy control. Hollow fiber nanofiltration membranes prepared by interfacial polymerization generally use hollow ultrafi...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D67/00B01D61/02
CPCB01D61/027B01D67/0006B01D69/08B01D2325/02
Inventor 魏秀珍陈金媛朱双双
Owner ZHEJIANG UNIV OF TECH