Polyamide membranes useful for water softening

Details Polyamide membranes useful for water softening Polyamide membranes useful for water softening

1986-04-28

1988-08-23

Wyse, Tom

Liquid purification or separation

Filter

Material

21050035, 21050038, 427245, 428420, 4284763, B01D 1300, B32B 2734

Patent

active

047658975

ABSTRACT:
A novel water softening membrane and process for making the same is described. The membrane can be prepared by treating a polyamide reverse osmosis membrane with a strong mineral acid followed by treatment with a rejection enhancing agent. The resulting membrane at transmembrane pressures of 50 psi can attain a magnesium sulfate rejection with a 0.2 percent aqueous solution of more than 90 percent with a water flux of more than 15 gallons per square foot per day.

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Report No. PB-81-170607 "Development of Improved Cleaning and Surface Regeneration Methods and Economic Analysis of These Methods for Sea Water Membranes", Burns and Roe, Inc., Paramus, NJ, prepared for Office of Water Research and Technology, Washington, DC-Jan. 31, 1981-U.S. Department of Commerce, National Technical Information Service.
Proceedings of the Second World Congress on Desalination and Water Re-use; vol. 3; Nov. 17-22, 1985; Bermuda; pp. 203-226, W. J. Conlon, "Pilot Field Test Data for Prototype Ultra Low Pressure R.O. Elements".

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