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Method for preparing hollow fiber hyperfiltration membrane with low molecular weight cut-off

A technology with molecular weight and low cut-off, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of complex membrane production process, large footprint of membrane modules, high cost, etc., and achieve simple membrane production process , Excellent film-forming performance and simple formula

Inactive Publication Date: 2009-08-05
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above-mentioned explorations and researches on low molecular weight cut-off ultrafiltration have a common disadvantage, that is, the membrane manufacturing process is complicated, the process control requirements are quite precise, the membrane manufacturing cost is high, and the prepared ultrafiltration membrane is a plate membrane, and the cost of industrial membrane assembly equipment is very high. Expensive, and the membrane module occupies a large area, which is not conducive to industrial application

Method used

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  • Method for preparing hollow fiber hyperfiltration membrane with low molecular weight cut-off
  • Method for preparing hollow fiber hyperfiltration membrane with low molecular weight cut-off

Examples

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Effect test

Embodiment 1

[0025] The raw materials were weighed according to the following weight percentages: polysulfone (PS) 30%; dimethylacetamide (DMAC) 60%; polyvinylpyrrolidone (PVP) 10% to prepare the casting solution. The preparation process is as follows: add 10% PVP into 60% DMAC solvent in the spinning kettle and heat it to 50°C to stir and dissolve. After the PVP is completely dissolved, add 30% PS and stir to dissolve. After stirring for 24 hours at a temperature of 50° C., the stirring was stopped, and the mixture was allowed to stand for 24 hours for defoaming. Extrude the defoamed casting solution from the 3C spinneret with a spinning metering pump, the extrusion speed is 9 rpm, the extrusion temperature is 50°C, and the extruded casting solution passes through a 5mm air The segment is injected into a water bath to solidify into a hollow fiber ultrafiltration membrane, the water bath is distilled water, and the temperature of the water bath is 30°C. The solidified hollow fiber ultrafi...

Embodiment 2

[0027] Weigh raw materials according to the following percentages by weight: polysulfone (PS) 30%; dimethylformamide (DMF) 65%; polyvinylpyrrolidone (PVP) 5% is formulated into a casting solution, and the process of Example 1 is repeated to obtain a hollow fiber Ultrafiltration membrane, 200 hollow fiber ultrafiltration membranes are bundled into a Φ32×500 cylinder for centrifugal casting to obtain the finished ultrafilter 2.

Embodiment 3

[0029] Weigh the raw materials according to the following weight percentages: polysulfone (PS) 20%; dimethylacetamide (DMAC) 60%; polyvinylpyrrolidone (PVP) 20% to prepare the casting solution, and the preparation process is: in the spinning kettle First add 20% PVP into 60% DMAC solvent and heat to 40°C and stir to dissolve. After the PVP is completely dissolved, add 30% PS and stir to dissolve. After stirring for 24 hours at a temperature of 40° C., the stirring was stopped, and the mixture was allowed to stand for 24 hours for defoaming. Extrude the defoamed casting solution from the 3C spinneret with a spinning metering pump, the extrusion speed is 9 rpm, the extrusion temperature is 40°C, and the extruded casting solution passes through 2mm of air The segment is injected into a water bath to solidify, the water bath is distilled water, and the temperature of the water bath is 10°C. The solidified hollow fiber ultrafiltration membrane is rinsed with ultrafiltration water,...

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Abstract

The invention relates to a method for preparing a macromolecular ultrafiltration membrane. The method for preparing a low trapped molecular weight hollow fibre ultrafiltration membrane comprises the following steps: (1) preparation of a casting membrane liquid: the method uses polysulfone as a raw material, dimethylfomamide or dimethylacetamide as a solvent and polyvinylpyrrolidone as an additive to prepare the casting membrane liquid, wherein each composition has the following mass percentage: 15 to 40 percent of the polysulfone, 50 to 80 percent of the dimethylfomamide or dimethylacetamide and 5 to 20 percent of the polyvinylpyrrolidone; and the casting membrane liquid is heated and stirred at a temperature of between 30 and 80 DEG C so that each composition is fully dissolved, sealed, kept stand and defoamed; (2) membrane forming: the casting membrane liquid prepared in the step (1) passes through a spinning plate, injected to a heating water bath through the distance of an air section and condensed to form the hollow fibre ultrafiltration membrane; and (3) posttreatment: the hollow fibre ultrafiltration membrane prepared in the step (2) is soaked in a mixed solution of glycerin, Tween-80 and water.

Description

technical field [0001] The invention relates to a preparation method of a polymer ultrafiltration membrane, in particular to a preparation method of a low molecular weight cut-off hollow fiber ultrafiltration membrane. Background technique [0002] Compared with traditional separation technology, membrane separation technology has many advantages such as high separation precision, low energy consumption, convenient operation, and no pollution to the environment. Therefore, it is more and more widely used in the fields of medicine, food, environmental protection and daily life. According to the shape, the membrane can be divided into hollow fiber type, plate type, roll type and tube type. The existing hollow fiber membranes are mainly ultrafiltration and microfiltration membranes. [0003] Ultrafiltration membrane is a separation process that uses pressure as the driving force to separate liquids with different pore sizes of ultrafiltration membranes. Molecular weight cut-o...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/08
Inventor 潘炳杰朱磊晏鹏
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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