A method for improving the performance of polyamide reverse osmosis membrane by surface modification

A reverse osmosis membrane and surface modification technology, which is applied in reverse osmosis, semipermeable membrane separation, chemical instruments and methods, etc., can solve the problems of membrane flux reduction, etc., and achieve membrane flux improvement, increase flux, increase The effect of throughput

Active Publication Date: 2018-09-21
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The reported anti-fouling modification methods of polyamide reverse osmosis membranes will reduce the membrane flux while improving the anti-fouling performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare 1g / L sodium lignosulfonate solution, under the conditions of operating pressure 0.6MPa, membrane surface flow velocity 3m / s, and temperature 25 degrees Celsius, cross-flow filter 5 lignin solutions with flat polyamide reverse osmosis membrane hours, and then use pure water to wash the residual lignin solution on the membrane surface twice under the condition of no pressure and membrane surface flow velocity of 4m / s to obtain the modified reverse osmosis membrane. After testing, the membrane flux is increased by 7%, and the rejection rate of sodium chloride is 98.06%.

Embodiment 2

[0028] Prepare 0.5g / L alkaline lignin solution, under the condition of operating pressure of 2MPa, membrane surface flow velocity of 1m / s, and temperature of 30 degrees Celsius, use roll-type polyamide reverse osmosis membrane to cross-flow filter 3 lignin solutions hours, and then use pure water to wash the residual lignin solution on the membrane surface for 3 times under the condition of no pressure and membrane surface flow velocity of 3m / s to obtain the modified reverse osmosis membrane. Through testing, the flux of the membrane is increased by 24%, and the interception rate of the inorganic salt sodium chloride is 98.5%.

Embodiment 3

[0030] Prepare a 2g / L alkaline lignin solution, and filter the lignin solution with a flat polyamide reverse osmosis membrane for 1 hour under the conditions of operating pressure of 1MPa, membrane surface velocity of 0.5m / s, and temperature of 45 degrees Celsius , and then use pure water to wash the residual lignin solution on the membrane surface for 4 times under the condition of no pressure and the flow velocity of the membrane surface is 1m / s to obtain the modified reverse osmosis membrane. Through testing, the membrane flux is increased by 12%, and the interception rate of the inorganic salt sodium chloride is 98.8%.

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Abstract

The invention relates to a method for improving polyamide reverse osmosis membrane performance through surface modification. The method comprises the specific steps that a lignin solution is prepared at first; then, the prepared lignin solution is filtered through a polyamide reverse osmosis membrane on the conditions of the certain pressure, flow speed and temperature; finally, the lignin solution in a device is discharged, and pure water is used for flushing the membrane device on the conditions of zero pressure and high flow speed to obtain the modified reverse osmosis membrane. According to the modified reverse osmosis membrane obtained through the method, the membrane surface roughness is improved, the load electric property is enhanced, the membrane osmosis performance is remarkably improved, the membrane anti-pollution capacity is improved, and the operation cost of the reverse osmosis membrane can be lowered.

Description

technical field [0001] The invention relates to a method for surface modification to improve the performance of a polyamide reverse osmosis membrane. It belongs to the surface treatment method of membrane material. Background technique [0002] The reverse osmosis membrane is a semi-permeable membrane that uses pressure as the driving force to intercept solutes in the solution. Compared with the evaporation separation process, reverse osmosis has the advantages of lower cost, simple operation process, high removal efficiency and environmental friendliness, and is widely used in many fields such as desalination of seawater and brackish water, wastewater treatment, concentration and separation. [0003] At present, commercial reverse osmosis membranes are mainly made of aromatic polyamide materials. How to improve membrane permeability and anti-pollution performance is a hot spot in the research of reverse osmosis membranes. The most important method is to modify the surface ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/06B01D67/00B01D61/02
CPCB01D61/025B01D67/0088B01D69/06B01D71/56
Inventor 邢卫红吴雅萍陈朋利汪勇李卫星
Owner NANJING TECH UNIV
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