Methanol conversion process using SAPO catalysts
AssigneeUop LLC
InventorPaul T. Barger
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Abstract
Hydrothermal treatment of silicoaluminophosphate molecular sieves at temperatures in excess of about 700.degree. C. for periods sufficient to destroy a large proportion of their acid sites while retaining at least 80 percent of their crystallinity is found to result in a catalyst for converting methanol to lower olefins having increased catalyst life, increased selectivity for C.sub.2 -C.sub.3 olefins and decreased selectivity for paraffin production than the untreated SAPO-n starting composition.
Claims4
Process for converting methanol to light olefins which comprises contacting methanol at a temperature in the range of 200.degree. C. to 700.degree. C. and at a pressure of 0.1 to 100 atmospheres with a crystalline silicoaluminophosphate molecular sieve which has been hydrothermally treated at a temperature of at least 700.degree. C. for a period of time sufficient to reduce its acidic sites to less than 3.times.10.sup.-3 per cc micropore volume while maintaining a degree of crystallinity of at least 80 percent.
Dependencies are inferred from the claim text.