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

• US 3,842,002 A
• Filed: 03/29/1973
• Issued: 10/15/1974
• Est. Priority Date: 07/14/1969
• Status: Expired due to Term

• Current Assignee: Boari G
• Original Assignee: Boari G
• Inventors: BOARI G
• Application Number:
  US05/346,111
• Time in Patent Office: 565 Days
• US Class Current: 210/673
• CPC Class Codes: B01J 41/07 in the weakly basic form
• CPC Class Codes: C02F 1/042 Prevention of deposits
• CPC Class Codes: C02F 1/20 by degassing, i.e. liberation of dissolved gases degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D
• CPC Class Codes: C02F 1/42 by ion-exchange ion-exchange in general B01J
• CPC Class Codes: C02F 1/66 by neutralisation; pH adjustment for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58
• CPC Class Codes: C02F 2001/422 using anionic exchangers
• CPC Class Codes: C02F 2001/425 using cation exchangers
• CPC Class Codes: C02F 2103/08 Seawater, e.g. for desalination
• CPC Class Codes: C02F 5/00 Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents softening using ion-exchange C02F1/42

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.

Claims

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;