Separation membrane element and separation membrane module

A separation membrane and element technology, applied in the field of separation membrane elements and separation membrane modules, can solve the problems of heavy weight and large thickness of the membrane support plate, and achieve the effects of high permeability, high durability and increasing the effective membrane area.

Active Publication Date: 2014-12-24
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems that the membrane support plate is thick and heavy

Method used

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  • Separation membrane element and separation membrane module
  • Separation membrane element and separation membrane module
  • Separation membrane element and separation membrane module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] Polyvinylidene fluoride (PVDF, weight-average molecular weight: 280,000) was used as the resin component for the film-forming stock solution. In addition, polyethylene glycol (PEG20,000, weight average molecular weight 20,000), N,N-dimethylformamide (DMF), and H 2 O acts as a cell opener, solvent and non-solvent, respectively. These were sufficiently stirred at a temperature of 95° C. to prepare a membrane-forming stock solution having the following composition.

[0129]

[0130] Set the density to 0.42g / cm 3 , A non-woven fabric made of rectangular polyester fibers with a size of 50cm wide x 150cm long is used as a substrate, the above film-making stock solution is cooled to 30°C and coated on the substrate, and immediately immersed in pure water at 20°C after coating for 5 minutes, and further immersed in hot water at 90°C for 2 minutes to wash off the solvent N,N-dimethylformamide and the cell opener polyethylene glycol. Thereafter, it was immersed in an aqueou...

Embodiment 2

[0136] The element was produced and evaluated in the same manner as in Example 1, except that the height of the coating ethylene vinyl acetate copolymer resin and the thickness of the separator aluminum plate were changed so that the gap on the permeation side of the separation membrane was 0.05 mm (50 μm). ), and as a result, the inner resin portion is roughly oval dot-shaped with a major diameter of 8.0 mm, a minor diameter of 4.5 mm, a vertical interval of 4.0 mm, and a horizontal interval of 2.5 mm, and its area ratio is 35% (refer to figure 1 ). It should be noted that the cross-sectional shape of the inner resin portion is substantially rectangular. The water permeability of the separation membrane is 24.6×10 -9 m 3 / m 2 / s / Pa, this value is lower than embodiment 1. Table 1 shows the results of the area ratio of the resin portion, the gap on the permeation side, and the water permeability.

Embodiment 3

[0138] The separation membrane element was produced and evaluated in the same manner as in Example 1, except that the height of the coated ethylene vinyl acetate copolymer resin and the thickness of the separator aluminum plate were changed so that the gap on the permeation side of the separation membrane was 2 mm ( 2000 μm), as a result, the inner resin part is roughly oval dots with a major diameter of 8.0 mm, a minor diameter of 4.5 mm, a vertical interval of 4.0 mm, and a horizontal interval of 2.5 mm, and its area ratio is 35% (refer to figure 1 ). In addition, the cross-sectional shape of the inner resin portion is substantially rectangular. The water permeability of the separation membrane is 25.8×10 -9 m 3 / m 2 / s / Pa, this value is almost equal to Example 1. Table 1 shows the results of the area ratio of the resin portion, the gap on the permeation side, and the water permeability.

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Abstract

Provided is a separation membrane element whereby permeation performance and durability can be enhanced without compromising the characteristics of a separation membrane having excellent separation membrane capability. This separation membrane element (1) is characterized in that two separation membranes (2, 2) form a pair, the permeation sides thereof facing each other with a gap (5) therebetween, a seal part (6) on the peripheral edge of the gap (5) is sealed, and the separation membranes (2, 2) are connected to each other by two or more resin parts (7) located on the inside relative to the seal part (6) on the peripheral edge.

Description

technical field [0001] The invention relates to a separation membrane element and a separation membrane assembly suitable for drinking water production, water purification treatment, waste water treatment and other water treatment fields, and the food industry field. Background technique [0002] In recent years, flat membrane or hollow fiber membrane separation membranes, which can be used for the purification of sewage or waste water, are being used in water with separation membrane elements equipped with separation membranes or separation membrane modules equipped with a plurality of such elements. Purification treatment. For the separation membrane used in the separation method using the separation membrane element, considering its pore size and separation function, there are microfiltration membranes, ultrafiltration membranes, nanofiltration membranes, reverse osmosis membranes and forward osmosis membranes, etc. These membranes are used for ( For example) In the case...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D63/00B01D63/08B01D63/10B01D63/14B01D69/10
CPCB01D63/082B01D69/10B01D2313/146B01D2315/06B01D2311/2665B01D69/061B01D63/084B01D2319/04
Inventor 岩井健太古野修治尾高善文小森研司渡边泰治北中敦间谷圣子安东秀明
Owner TORAY IND INC
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