Method for removing sulfate and bicarbonate ions from sea water or brackish water through the use of weak anionic exchange resins containing amino groups of the primary and secondary type

Abstract

Abstract R-CL+SO2=->R-SO4+CL- SAID BICARBONATE IONS IN SAID SEA WATER OR BRACKISH WATER BEING ELIMINATED BY THE HYDROLYSIS OF SAID RESIN ACCORDING TO THE FOLLOWING EQUATIONS: R-CL+H2O->-<R-OH+H++CLHCO3-+H+->CO2+H2O 1. A METHOD FOR REMOVING SULFATE AND BICARBONATE IONS FROM SEA WATER OR BRACKISH WATER PRIOR TO BEING SUBJECTED TO DESALINATION IN A CONVENTIONAL DESALINATION PLANT, WHICH COMPRISES: PERMITTING SAID SEA WATER OR BRACKISH WATER TO PASS THROUGH A BED CONTAINING THE CHLORIDE FORM OF A WEAK ANIONIC RESIN HAVING AMINO FUNCTIONAL GROUPS OF THE PRIMARY AND SECONDARY TYPE, SAID CHLORIDE FORM OF SAID RESIN BEING EXPRESSED AS R-CI, THUS PERMITTING THE SULFATE IONS IN SAID SEA WATER OR BRACKISH WATER TO BE EXCHANGED FOR THE CHLORIDE IONS OF SAID RESIN BY THE FOLLOWING EQUATION: AND SUBSEQUENTLY, REGENERATING SAID RESIN TO THE CHLORIDE FORM, WHEN SAID RESIN IS EXHAUSTED, BY PERMITTING THE BRINE SOLUTION DISCHARGE FROM THE DESALINATION PROCEDURE AND HAVING A SALT CONCENTRATION OF AT LEAST 1.5 TIMES GREATER THAN THAT OF SAID SEA WATER OR BRACKISH WATER TO CIRCULATE THROUGH SAID BED CONTAINING SAID RESIN HAVING SAID AMINO FUNCTIONAL GROUPS OF THE PRIMARY AND SECONDARY TYPE, THE CHLORIDE/SULFATE RATIO OF SAID BRINE SOLUTION BEING AT LEAST 3 TIMES GREATER THAN THAT OF SAID SEA WATER OR BRACKISH WATER TREATED, AND THE PH OF SAID BRINE SOLUTION BEING BETWEEN 4 AND 5 TO DISPLACE REACTION (2) ABOVE, TO THE LEFT.

Inventors

• 👤 G Boari

Bibliographic Details