Patent ID: 8603431
Filing Date: 2013-12-10
Classification: B01J,C01B,C07C,Y02P

Abstract:
1. Process for producing a SAPO molecular sieve having a SAPO-34 crystal structure, the process comprising the steps of: mixing a P source with an Al source to obtain a mixture, adding a Si source and a template to said first mixture to obtain a suspension or slurry, optionally adjusting the pH of said slurry or suspension to a value in the range from 5 to 6.8, hydrothermal treating said suspension or slurry to obtain said SAPO molecular sieve suspension, recovering said SAPO molecular sieve from said suspension and drying it, characterized in that said mixture of Al and P sources is digested under stirring before adding said Si source and said template, said digestion step being carried out at a temperature in the range of 50-100° C. for a period of time from 10 to 30 hours.