Abstract 1. A METHOD FOR PRODUCING CALCIUM SULFITE SEMIHYDRATE IN CRYSTAL FORM, IN WHICH THE CRYSTAL HAS A SIZE RANGE OF FROM 1 TO 100 MICRONS (A SHORT AXIS OF 1 TO 30 MICRONS, AND A LONG AXIS OF 5 TO 100 MICRONS), SAID METHOD COMPRISING THE STEPS OF PREPARING AN AQUEOUS MIXTURE OF ACIDIC ALKALI METAL SULFITE AND ALKALI METAL SULFITE, AND ADDING TO AND REACTING WITH SAID AQUEOUS MIXTURE CALCIUM CARBONATE, WHILE MAINTAINING THE FOLLOWING REACTION CONDITIONS: A. CONCENTRATION OF THE ALKALI METAL SALT (MOLAR RATIO OF ACIDIC METAL SULFITE TO ALKALI METAL SULFITE BEING IN A RANGE OF FROM 0.1 TO 5.0 PERCENT BY WEIGHT 2 TO 30 B. PH VALUE OF THE REACTION SYSTEM 5.5 TO 7.8 C. REACTION TEMPERATURE *C 40 TO 80
Inventors
👤 M Onozuka
👤 K Nomoto
👤 K Iida
👤 T Morita
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-05 04:21
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A METHOD FOR PRODUCING CALCIUM SULFITE SEMIHYDRATE IN CRYSTAL FORM, IN WHICH THE CRYSTAL HAS A SIZE RANGE OF FROM 1 TO 100 MICRONS (A SHORT AXIS OF 1 TO 30 MICRONS, AND A LONG AXIS OF 5 TO 100 MICRONS), SAID METHOD COMPRISING THE STEPS OF PREPARING AN AQUEOUS MIXTURE OF ACIDIC ALKALI METAL SULFITE AND ALKALI METAL SULFITE, AND ADDING TO AND REACTING WITH SAID AQUEOUS MIXTURE CALCIUM CARBONATE, WHILE MAINTAINING THE FOLLOWING REACTION CONDITIONS: A. CONCENTRATION OF THE ALKALI METAL SALT (MOLAR RATIO OF ACIDIC METAL SULFITE TO ALKALI METAL SULFITE BEING IN A RANGE OF FROM 0.1 TO 5.0 PERCENT BY WEIGHT 2 TO 30 B. PH VALUE OF THE REACTION SYSTEM 5.5 TO 7.8 C. REACTION TEMPERATURE *C 40 TO 80
Claim 2
Independent Claim
126 words
A METHOD FOR PRODUCING CALCIUM SULFITE SEMIHYDRATE IN CRYSTAL FORM, IN WHICH THE CRYSTAL HAS A SIZE RANGE OF FROM 1 TO 100 MICRONS (A SHORT AXIS OF 1 TO 30 MICRONS, AND A LONG AXIS OF 5 TO 100 MICRONS), SAID METHOD COMPRISING THE STEPS OF PREPARING AN AQUEOUS MIXTURE OF ACIDIC ALKALI METAL SULFITE AND ALKALI METAL SULFITE, AND ADDING TO AND REACTING WITH SAID AQUEOUS MIXTURE CALCIUM CARBONATE, WHILE MAINTAINING THE FOLLOWING REACTION CONDITIONS: A. CONCENTRATION OF THE ALKALI METAL SALT (MOLAR RATIO OF ACIDIC METAL SULFITE TO ALKALI METAL SULFITE BEING IN A RANGE OF FROM 0.1 TO 5.0 PERCENT BY WEIGHT 2 TO 30 B. PH VALUE OF THE REACTION SYSTEM 5.5 TO 7.8 C. REACTION TEMPERATURE *C 40 TO 80