Process for producing crystalline zeolite a

Abstract

Abstract A PROCESS FOR PREPARING SODIUM ZEOLITE A WHICH COMPRISES PREPARING AN AQUEOUS SODIUM-ALUMIN-SILICATE REACTANT MIXTURE CONSISTING ESSENTIALLY OF (1) OXIDES OF SILICON, ALUMINUM AND SODIUM AND (2) WATER, IN THE PROPORTION, EXPRESSED IN TERMS OF OXIDE MOL RATIOS, FALLING WITHIN THE FOLLOWING RANGES: RANGE 1 RANGE 2 RANGE 3 RANGE 4 NA2O/SIO2 0.4-0.7 0.4-0.7 0.7-1 1-4 SIO2/AL2O31-2 1-2.5 1-2.5 1-2.5 H2O/NA2O 40-100 120-300 220-300 210-300 WHEREIN THE MAJOR SOURCE OF SILICA IN THE REACTANT MIXTURE IS ALLOPHANE, MAINTAINING THE REACTANT MIXTURE AT A TEMPERATURE WITHIN THE RANGE OF 40* C. TO 180* C. FOR A SUFFICIENT PERIOD TO CRYSTALLIZE SODIUM ZEOLITE A, AND SEPARATING THE CRYSTALS FROM THE MOTHER LIQUOR. A PROCESS FOR PREPARING SODIUM ZEOLITE A WHICH COM PRISES PREPARING AN AQUEOUS SODIUM-ALUMINO-SILCATE REACTANT MIXTURE CONSISTING ESSENTIALLY OF (1) OXIDES OF SILICON, ALUMINUM AND SODIUM AND (2) WATER, IN THE PROPORTION, EXPRESSED IN TERMS OF OXIDE MOL RATIOS, FALLING WITHIN THE FOLLOWING RANGES; RANGE 1 RANGE 2 RANGE 3 NA2O/SIO2 0.4-0.7 0.7-1 1-4 SIO2/AL2O3 1-2.5 1-2.5 1-2.5 H2O/NA2O 120-300 220-300 210-300 WHEREIN THE MAJOR SOURCE OF SILICA IN THE REACTANT MIXTURE IS SOLUBLE SODIUM SILICATE, MAINTAINING THE REACTANT MIXTURE AT A TEMPERATURE WITHIN THE RANGE OF 40* C. TO 180* C, FOR A SUFFICIENT PERIOD TO CRYSTALLIZE SODIUM ZEOLITE A, AND SEPARATING THE CRYSTALS FROM THE MOTHER LIQUOR.

Inventors

• 👤 Tadao Ueda
• 👤 Kenji Sato
• 👤 Yasusi Nakamura

Bibliographic Details