Process for the synthesis of flyash based zeolite-Y

• Main Authors: RAYALU; SADHANA, LABHASETWAR; NITIN KUMAR, KHANNA; PURUSHOTTAM
• Format: Patent
• Language: English
• Published: 22.02.2000
• Edition: 7
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS

The present invention relates to a process for the synthesis of flyash based zeolite-Y (FAZ-Y), comprising grainding and mixing of flyash with caustic soda in a ratio ranging between 1:0.4-1:1.2 to obtain a fine homogenous fusion mixture, heating the said fusion mixture in an invert vessel at about 500-600 DEG C. for about 1-2 hours to obtain a fused mass, cooling, milling, and mixing of the said fused mass in distilled water for about 8-12 hours, subjecting the said slurry to hydrothermal crystallization at about 90-110 DEG C. for 8 to 12 hours to obtain FAZ-Y crystals, washing the said crystals with water and then subjecting the washed crystals to oven drying at 50-60 DEG C. to obtain the desired FAZ-Y crystals.