Olefin separations employing CTS molecular sieves
AssigneeEngelhard Corporation
InventorsSteven M. Kuznicki, Valerie A. Bell
Life of this patent
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Abstract
Separation of ethylene from ethane is achieved by feeding a mixture of the C2 hydrocarbons in contact with a CTS-1 crystalline titanium silicate molecular sieve which has a controlled pore size to selectively adsorb ethylene and size exclude ethane. The feed stream can also contain acetylene which can be selectively adsorbed from both ethane and ethylene by further controlling the pore size of the CTS-1 molecular sieve. Propane/propylene separation is also disclosed.
Claims30
A method of separating an olefin from a gaseous mixture which further contains a paraffin having the same carbon content as said olefin comprising;
- passing said mixture in contact with an ETS-4 or a CTS-1 titanium silicate molecular sieve adsorbent to selectivity adsorb said olefin and size exclude said paraffin from the pores of said molecular sieve, recovering a product stream which has a higher concentration of said olefin than said mixture, said ETS-4 being exchanged with barium or a mixture of multivalent cations with or without barium.
A method of recovering an olefin from a hydrocarbon liquid stream containing a paraffin of the same carbon content as said olefin;
- comprising:
- thermally cracking said hyrdrocarbon liquid stream to form a mixture of at least said paraffin and said olefin, passing said mixture in contact with an ETS-4 or CTS-1 titanium silicate molecular sieve adsorbent to selectively adsorb said olefin and size exclude said paraffin, recovering a product stream having an olefin content greater than said mixture, said ETS-4 being exchanged with barium or a mixture of multivalent cations with or without barium.
A method of separating acetylene from a feed stream comprising acetylene and one or both of ethane and ethylene, comprising passing said feed stream in contact with an ETS-4 or CTS-1 crystalline titanium silicate molecular sieve which has a pore size to size exclude ethane and ethylene and adsorb acetylene, recovering a product stream having a concentration of acetylene greater than said feed stream, said ETS-4 being exchanged with barium or a mixture of multivalent cations with or without barium.
Dependencies are inferred from the claim text.