Utilization of saline water

• US 3,350,292 A
• Filed: 05/14/1964
• Issued: 10/31/1967
• Est. Priority Date: 05/14/1964
• Status: Expired due to Term

• Current Assignee: De Lapp Darwin Fiske, Joseph Weinberger Arthur
• Original Assignee: De Lapp Darwin Fiske, Joseph Weinberger Arthur
• Inventors: JOSEPH WEINBERGER ARTHUR, DE LAPP DARWIN FISKE
• Application Number:
  US04/367,428
• Time in Patent Office: 1,265 Days
• US Class Current: 210/651
• CPC Class Codes: B01J 39/00 Cation exchange; Use of material as cation exchangers; Treatment of material for improving the cation exchange properties ion-exchange chromatography processes B01D15/36
• CPC Class Codes: C02F 1/06 Flash evaporation
• CPC Class Codes: C02F 1/4693 electrodialysis
• 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 2001/425 using cation exchangers
• CPC Class Codes: C02F 2103/08 Seawater, e.g. for desalination
• CPC Class Codes: C02F 2303/16 Regeneration of sorbents, filters
• CPC Class Codes: C02F 5/02 Softening water by precipitation of the hardness
• CPC Class Codes: C02F 5/06 using calcium compounds
• CPC Class Codes: C02F 9/00 Multistage treatment of water, waste water or sewage
• CPC Class Codes: Y02A 20/124 Water desalination

Claims

6. THE METHOD OF RECOVERING POTABLE WATER FROM SEA WATER WHICH COMPRISES ADDING IN ANY ORDER TO SEA WATER (1) A SOLUBLE ALKALINE MATERIAL FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, CALCIUM OXIDE AND CALCIUM HYDROXIDE TO CONVERT SUBSTANTIALLY ALL OF THE BICARBONATE TO CARBONATE, AND (2) SODIUM CARBONATE TO REACT WITH SUBSTANTIALLY ALL OF THE CALCIUM, AND SEPARATING OUT THE RESULTANT PRECIPITATED CALCIUM CARBONATE, TOGETHER WITH COPRECIPITATED IRON AND ALUMINUM AS HYDROXIDES, AND SUBSEQUENTLY SEPARATELY ADDING ADDITIONAL SODIUM HYDROXIDE AND SEPARATING MAGNESIUM FROM THE DECALCIFIED SEA WATER, AS THE HYDROXIDE, THUS FORMING A DESCALED SEA WATER, ADDING A LOW COST MINERAL ACID TO THE THUS DESCALED SEA WATER, PHYSICALLY CONVERTING THE DESCALED SEA WATER CONTAINING SAID MINERAL ACID TO A POTATABLE WATER PRODUCT AND A SALINE CONCENTRATE BY ELECTRODIALYSIS, AND RECOVERING AND RECYCLING AT LEAST PART OF THE SODIUM VALUES IN THE SALINE CONCENTRATE AS SODIUM HYDROXIDE FOR PH ADJUSTMENT.