Process for making ethylene and propylene
AssigneeExxonMobil Chemical Patents Inc.
InventorsShun C. Fung, Chunshe Cao, Teng Xu
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Abstract
A process for increasing the ethylene selectivity of a silicoaluminophosphate molecular sieve catalyst by using acetone in an oxygenate conversion process. Acetone can be added with the oxygenate feed at a concentration from about 1% to about 15% by weight, preferably about 1% to about 8% by weight, more preferably about 2% to about 5% by weight. Alternatively, acetone can be added as a pre-feed to the molecular sieve catalyst, particularly regenerated and fresh catalyst, in an contact zone. The pre-feed contacted catalyst is then directed to an oxygenate conversion zone. The acetone concentration in the pre-feed is from about 1% to about 99% by weight, preferably about 30% to about 70% by weight.
Claims15
A method of making ethylene and propylene comprising:
- contacting a silicoaluminophosphate molecular sieve catalyst with an oxygenate comprising at least one of methanol, ethanol, n-propanol, and dimethylether, to convert a portion of the oxygenate to an olefin product containing ethylene and propylene, the oxygenate further comprising about 1% to about 15% by weight acetone;
- and
- separating the ethylene and propylene from the olefin product.
A method of making ethylene and propylene comprising:
- contacting regenerated, silicoaluminophosphate molecular sieve catalyst with a pre-feed comprising acetone in a contact zone;
- directing the acetone contacted catalyst and an oxygenate comprising at least one of methanol, ethanol, n-propanol, and dimethylether, to an oxygenate conversion zone to produce an olefin product;
- and
- separating the ethylene and propylene from the olefin product.
Dependencies are inferred from the claim text.