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Preparation method of double-layer hollow fibrous nanofiltration membrane

A double-layer hollow nanofiltration membrane technology, which is applied in the field of membrane separation, can solve the problems of low yield of nanofiltration membranes, complicated preparation methods, and many factors affecting the process, so as to achieve uniform and stable membrane layers, good separation performance, The effect of simplifying the preparation process

Inactive Publication Date: 2018-06-08
江苏向阳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is complicated in process, and there are many influencing factors in the process, which is difficult to grasp, so it is easy to cause the yield of the prepared nanofiltration membrane to be low.

Method used

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  • Preparation method of double-layer hollow fibrous nanofiltration membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Mix and stir the high molecular polymer a, organic solvent and dispersant according to the mass ratio of 10%: 45%: 45% to form a uniform and stable casting solution A, and remove the bubbles in the casting solution by vacuum suction ,stand-by.

[0017] (2) Mix and stir the high molecular polymer b, organic solvent and dispersant according to the mass ratio of 20%: 50%: 30% to form a uniform and stable casting solution B, and remove the bubbles in the casting solution by vacuum suction ,stand-by.

[0018] (3) The casting solution A and the casting solution B are ejected through the double-hole spinneret under the pressure drive at the same time. The driving pressure of the casting solution A is 0.05MPa, and the driving pressure of the casting solution B is 0.2MPa. The liquid flow rate is 20ml / min, the air section distance is 10cm, and the spun membrane filaments are formed in the outer gel bath water to obtain a double-layer hollow fiber nanofiltration membrane.

Embodiment 2

[0020] (1) Mix and stir the high molecular polymer a, organic solvent and dispersant according to the mass ratio of 10%: 45%: 45% to form a uniform and stable casting solution A, and remove the bubbles in the casting solution by vacuum suction ,stand-by.

[0021] (2) Mix and stir the high molecular polymer b, organic solvent and dispersant according to the mass ratio of 25%: 50%: 25% to form a uniform and stable casting solution B, and remove the bubbles in the casting solution by vacuum suction ,stand-by.

[0022] (3) The casting solution A and the casting solution B are ejected through the double-hole spinneret under the pressure drive at the same time. The driving pressure of the casting solution A is 0.05MPa, and the driving pressure of the casting solution B is 0.2MPa. The liquid flow rate is 20ml / min, the air section distance is 10cm, and the spun membrane filaments are formed in the outer gel bath water to obtain a double-layer hollow fiber nanofiltration membrane.

Embodiment 3

[0024] (1) Mix and stir the high molecular polymer a, organic solvent and dispersant according to the mass ratio of 10%: 45%: 45% to form a uniform and stable casting solution A, and remove the bubbles in the casting solution by vacuum suction ,stand-by.

[0025] (2) Mix and stir the high molecular polymer b, organic solvent and dispersant according to the mass ratio of 30%: 50%: 20% to form a uniform and stable casting solution B, and remove the bubbles in the casting solution by vacuum suction ,stand-by.

[0026] (3) The casting solution A and the casting solution B are ejected through the double-hole spinneret under the pressure drive at the same time. The driving pressure of the casting solution A is 0.05MPa, and the driving pressure of the casting solution B is 0.2MPa. The liquid flow rate is 20ml / min, the air section distance is 10cm, and the spun membrane filaments are formed in the outer gel bath water to obtain a double-layer hollow fiber nanofiltration membrane.

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Abstract

The invention relates to a preparation method of a double-layer hollow fibrous nanofiltration membrane. The method comprises the following steps of a step (1), mixing and agitating a high-molecular polymer a, an organic solvent and a dispersant according to a certain proportion to form a uniform and stable membrane casting solution A, removing an air bubble in the membrane casting solution throughvacuum suction, and enabling to be for later use; a step (2), mixing and agitating a high-molecular polymer b, an organic solvent and a dispersant according to a certain proportion to form a uniformand stable membrane casting solution B, removing an air bubble in the membrane casting solution through the vacuum suction, and enabling to be for later use; a step (3), simultaneously ejecting the membrane casting solution A and the membrane casting solution B through a double-hole spinning nozzle under pressure driving, entering an outer gel bath in certain conditions of a core liquid flow velocity and an air section distance, and molding, so that the double-layer hollow fibrous nanofiltration membrane is obtained. The double-layer hollow fibrous nanofiltration membrane prepared by the method has favorable tensile strength; further, a membranous layer is uniform and stable, and the separation performance is favorable.

Description

technical field [0001] The invention relates to a preparation method of a double-layer hollow fiber nanofiltration membrane. It belongs to the technical field of membrane separation. Background technique [0002] Water resources are one of the important natural resources, and are indispensable and irreplaceable material resources for human survival and social development. The development and utilization of water resources play a decisive role in economic and social development. However, with the development of industry and agriculture, the annual water consumption is increasing year by year, water pollution is gradually increasing, the ecological environment tends to deteriorate, water resources are greatly reduced, and the contradiction between supply and demand of water resources is becoming increasingly prominent. How to solve the contradiction between supply and demand of water resources and promote economic and social development has become an urgent problem to be sol...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D67/00B01D71/34B01D71/68
CPCB01D67/0011B01D67/0013B01D69/08B01D71/34B01D71/68
Inventor 李祥庆
Owner 江苏向阳科技有限公司
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