Available Technology

CHLORINE RESISTANT POLYAMIDES AND MEMBRANES MADE FROM THE SAME

A chlorine resistant polyamide is formed from the reaction product of an amine and an acid chloride monomer wherein the acid chloride monomer is modified with electron-withdrawing groups that exhibit sufficient activity to (i) minimize any chlorination on both the amine and acid chloride side and (ii) minimize N-chlorination. A membrane is made from the polyamide and, in one application, the membrane is used in a desalination unit.
Abstract: 
Reverse osmosis polyamide membranes are used to desalinate and purify seawater, wastewater, and surface water. Chlorine is used in the reverse osmosis process to prevent biofouling of the membrane, but chlorine rapidly degrades polyamide membranes. Chlorine Resistant Membrane is a new polyamide membrane chemical formulation that is resistant to chlorine degradation which increases the life of the membrane and can lower replacement costs for desalting plants.
Inventors: 

Robert Lee Riley, Jr.

Andrew P. Murphy

Balasingam Murugaverl

Patent Number: 
US2011203990
Patent Issue Date: 
September 25, 2011
Lab Representatives
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