Patent ID: 6171563
Filing Date: 2001-01-09
Classification: B01D,C01G,C02F,C22B,Y02P

Abstract:
A process for removal and recovery of chromium from a feed solution containing hexavalent chromium Cr(VI) comprising(1) in a first supported liquid membrane comprising an amine embedded in a microporous support material, treating a feed solution containing hexavalent chromium with a first strip solution to produce a moderately concentrated Cr(VI) solution comprising from 1,000 ppm to 20,000 ppm Cr(VI) and a treated feed solution comprising a chromium concentration of less than about 0.5 ppm; and(2) in a second supported liquid membrane comprising an amine embedded in a microporous support material, treating the moderately concentrated Cr(VI) solution with a second strip solution to produce a product solution comprising from 50,000 ppm to 300,000 ppm Cr(VI) and less than 100,000 ppm sulfate and to produce a treated solution, resulting from the moderately concentrated Cr(VI) solution, comprising an amount of chromium similar to the feed solution for recycling to this feed solution.