Composite polyamide reverse osmosis membrane and method of producing the same
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United States of America Patent
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Jan 18, 2000
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app pub date -
Feb 18, 1998
filing date -
Feb 18, 1998
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Abstract
A composite polyamide reverse osmosis membrane and method of producing same. In a preferred embodiment, the membrane is made by coating a porous polysulfone support for about 1 minute with an aqueous solution containing 2 wt % m-phenylenediamine (MPD), 2 wt % 2-butoxyethanol and 2 wt % propylene glycol. Next, the excess MPD solution is removed, and the coated support is dipped for about 1 minute in 0.1 wt % organic solvent solution of trimesoyl chloride (TMC) in a mixture of alkanes having from 8 to 12 carbon atoms. After draining the TMC solution off, the resulting composite membrane is air dried at room temperature to 40.degree. C. for about 1 minute and then rinsed in a basic aqueous solution at 40-60.degree. C. for 1 to 30 minutes. The resultant membrane exhibits a flux of 27.5 gfd and a salt rejection of 98.2% when used at 225 psi for an aqueous solution containing 2000 ppm of NaCl.
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