Compound forward osmosis membrane with separation function and preparation method thereof

A forward osmosis membrane and functional technology, applied in the field of forward osmosis membrane and preparation, to achieve the effect of good separation effect, high water flux and broad application prospects

Inactive Publication Date: 2018-12-18
中煤能源研究院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the amount of salt backmixing can be used to change the ratio of salt components in the water on both sides of the forward osmosis membrane to achieve special purposes. There is no relevant research on the concentration and redistribution of salt components through forward osmosis.

Method used

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  • Compound forward osmosis membrane with separation function and preparation method thereof
  • Compound forward osmosis membrane with separation function and preparation method thereof
  • Compound forward osmosis membrane with separation function and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0036] The preparation method of the forward osmosis membrane with multivalent separation function of the present invention comprises the following steps:

[0037] (1) impregnating the porous support layer in an aqueous phase solution containing two or more reactive amino compounds;

[0038] (2) use a rubber roller to remove excess water phase solution on the surface of the porous support layer after water phase infiltration;

[0039] (3) impregnating the porous support layer treated in step (2) in an organic phase solution of an acid chloride compound containing two or more acid chloride groups;

[0040] (4) make described forward osmosis membrane after heat treatment, washing;

[0041] The porous support layer is one of a polysulfone porous support layer, a polyethersulfone porous support layer, a sulfonated polyethersulfone porous support layer, and a polypropylene porous support layer with a molecular weight cut-off of 30,000 to 50,000.

[0042] The compound containing t...

Embodiment 1

[0067] Use a polyethersulfone porous support membrane with a molecular weight cut-off of 30,000 to 50,000 (ie, a polyethersulfone porous support layer), and contact the front side with a piperazine aqueous phase solution (ie, an aqueous solution) with a concentration of 1 g / L for about 60 seconds. The polyethersulfone support membrane soaked by the phase solution was removed with a rubber roller to remove excess solution. Then this support membrane was contacted with the IsoparE solution of trimesoyl chloride with a concentration of 1g / L for 60 seconds; then the formed polyamide layer was air-dried, placed in an oven at 65°C for 5min, and then heated at 25°C Rinse in deionized water to obtain a composite forward osmosis membrane, and the prepared composite forward osmosis membrane is stored in deionized water.

[0068] The performance of the special forward osmosis membrane prepared by the present invention is characterized by the above method, and the draw solution is 1mol / LN...

Embodiment 2

[0071] The preparation method of the composite membrane is the same as in Example 1, except that the piperazine aqueous phase solution is changed to 10 g / L. Using formula (1) to calculate the water flux is 34.15L m -2 h -1 , the salt backmixing flux calculated by formula (2) is 24.34g / m 2 h.

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Abstract

The invention discloses a forward osmosis membrane with a separation function. The special forward osmosis membrane with the multivalent separation characteristic is prepared on a polymer based membrane, so that the forward osmosis flux is increased, and separation on multivalent ions in a draw solution is simultaneously achieved; thus, monovalent ions can permeate through the membrane to enter araw material solution, and the multivalent ions cannot permeate through the membrane. The special forward osmosis membrane has special application value in concentrating strong brine and changing a proportion among different saline ions in the strong brine. The special forward osmosis membrane disclosed by the invention not only has a concentrating function, but also has a function of adjusting the proportion among saline components in water. As industrial wastewater zero release projects are propelled in China, the special forward osmosis membrane with the multivalent separation function hasa wide application prospect.

Description

technical field [0001] The invention relates to a forward osmosis membrane with a separation function and a preparation method. The forward osmosis membrane has special application value in concentrating concentrated brine and changing the ratio of different salt ions in the concentrated brine. Background technique [0002] Forward osmosis is a new type of membrane separation treatment technology. Forward osmosis refers to the process in which water flows from the higher water chemical potential (or lower osmotic pressure) side area to the lower water chemical potential (or higher osmotic pressure) side area through the selectively permeable membrane. Two solutions with different osmotic pressures are placed on both sides of the selectively permeable membrane, one is the feed solution with lower osmotic pressure, and the other is the draw solution with higher osmotic pressure ( Draw solution), forward osmosis uses the osmotic pressure difference of the solution on both side...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/26B01D69/12B01D67/00B01D65/10
CPCB01D65/10B01D67/0006B01D69/125B01D71/26B01D71/68
Inventor 史元腾赵泽盟
Owner 中煤能源研究院有限责任公司
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