Copolymer production system and process
AssigneeExxonMobil Chemical Patents Inc.
InventorsKevin W. Lawson, Rodney S. Smith
Life of this patent
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Abstract
In a process for making a copolymer, a first product stream comprising a semi-crystalline polymer and a chain terminating agent is produced in a first reactor system. The first product is provided to a second reactor system wherein a low crystallinity polymer is produced in the presence of the semi-crystalline polymer. At least a portion of the chain terminating agent is removed from the second reactor system by an in-situ process.
Claims17
A process for making a copolymer, the process comprising:
- a) producing a product stream comprising a semi-crystalline polymer and a chain terminating agent in a first reactor system;
- b) transferring at least a portion of the product effluent stream from the first reactor system to a second reactor system comprising a monomer circuit to form a low crystallinity polymer in the presence of the semi-crystalline polymer;
- and
- c) removing at least a portion of the chain terminating agent from a slipstream circuit in recirculating communication with the monomer circuit.
A method to control hydrogen levels and thereby produce a high IV ratio olefin impact copolymer in a process comprising producing a semi-crystalline polymer in a first reactor system, and transferring a product effluent stream from the first reactor system to a second reactor system comprising a recirculating monomer circuit to form a low crystallinity polymer in the presence of the semi-crystalline polymer, the method comprising removing molecular hydrogen from a slipstream circuit in recirculating communication with the monomer circuit.
A process unit, comprising a first reactor system to produce a semi-crystalline polymer, a transfer unit to transfer a product effluent stream from the first reactor system to a second reactor system to form a low crystallinity polymer in the presence of the semi-crystalline polymer, a monomer circuit to recirculate monomer through a reactor in the second reactor system, and a slipstream circuit comprising a chain terminating agent removal unit in recirculating communication with the monomer circuit to remove chain terminating agent from the second reactor system.
Dependencies are inferred from the claim text.