公开(公告)号：US3679580A

公开(公告)日：1972-07-25

申请号：US3679580D

申请日：1970-07-13

Applicant: CONSIGLIO NAZIONALE RICERCHE

Inventor： BOARI GIANFRANCO ,  LIBERTI LORENZO ,  MERLI CARLO ,  PASSINO ROBERTO

IPC: B01D15/04 ,  B01J39/04 ,  B01J49/00 ,  C02F1/00 ,  C02F1/20

CPC classification number: C02F1/20 ,  B01J39/07 ,  B01J49/08 ,  C02F1/42 ,  C02F2301/08 ,  B01J41/07 ,  B01J39/05

Abstract: A PROCESS FOR THE DE-IONIZATION OF AQUEOUS SALINE SOLUTIONS BY MEANS OF ION EXCHANGE TREATMENT IS DISCLOSED, THE PROCESS BEING CHARACTERIZED BY THE FACT THAT THE PROCESS IS CARRIED OUT BY USING A CATION EXCHANGER, AN ANION EXCHANGER AND A CATION EXCHANGER ARRANGED IN SERIES, AND WHEREIN THE FIRST CATION EXCHANGER IS CONSTITUTED OF ESSENTIALLY WEAK CATION EXCHANGE RESINS AND THE ANION EXCHANGER IS CONSTITUTED OF WEAK ANION EXCHANGE RESINS, THE PROCESS COMPRISING THE STEPS OF: PASSING THE AQUEOUS SOLUTION TO BE DE-IONIZED THROUGH THE FIRST CATION EXCHANGER, THEN THROUGH THE ANION EXCHANGER AND AT LAST

THROUGH THE SECOND CATION EXCHANGER; RECYCLING A PART OF THE SOLUTION EFFLUENT FROM THE ANION EXCHANGER UPSTREAM OF THE FIRST CATION EXCHANGER AND CONTROLLING THE RECYCLE IN ORDER TO OBTAIN A METHYL ORGANE ALKALINITY IN THE SOLUTION FEEDING THE FIRST CATION EXCHANGER, AND IF NECESSARY, DECARBONATING THE SOLUTION EFFIUENT FROM THE LAST CATION EXCHANGER AND RECYCLING THE RECOVERED CO2 UPSTREAM OF THE ANION EXCHANGER.

Abstract translation: 1311163离子交换CONSIGLIO NAZIONALE DELLE RICERCHE 1970年7月9日[1969年7月12日] 33291/70标题B1J去离子溶液通过弱酸性阳离子交换剂，至少部分流出物通过弱碱性阴离子交换剂， 交换机。 来自离子交换剂的至少部分流出物被供给到阳离子交换剂进料中，以确保在再循环期间所述进料具有甲基橙碱度。 CO 2可以从流出物中除去并用于在该过程的阶段中循环使用。

公开(公告)号：US3901781A

公开(公告)日：1975-08-26

申请号：US38124573

申请日：1973-07-20

Applicant: CONSIGLIO NAZIONALE RICERCHE

Inventor： PASSINO ROBERTO ,  BOARI GIANFRANCO

IPC: B01D61/44 ,  C02F1/42 ,  C02F1/469 ,  B01D13/02

CPC classification number: B01D61/44 ,  B01D2311/2623 ,  C02F1/42 ,  C02F1/4693 ,  Y02A20/134

Abstract: A process for demineralizing water comprising the combination of a pre-treatment of the water and an electrodialysis process for demineralizing said pre-treated water, said pre-treatment comprising an ion exchange treatment using exchange resins of cationic type to replace in the water to be fed to the electrodialysis device, the hard cations with H ions and Na ions, either separately or together, according to the water characteristics, in particular using H ions to neutralize the HCO3 ions, said pre-treatment also comprising a regeneration of the exhausted ion exchange resins.