Method of controlling molecular weight distributions during a polymerization process
AssigneeFina Technology, Inc.
InventorsJose M. Sosa, Aron T. Griffith
Life of this patent
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Abstract
The present invention provides to overcome the deficiencies of the prior art, the present invention provides a method of producing a polymer. The method includes taking a product stream from a monovinyl aromatic polymerization system wherein the product stream comprises a polymerized monomer and a monomer. The product stream is introduced into an up-flow heat exchanger in a presence of an initiator, such as a peroxide, that affects a polymerization of the monomer in the up-flow heat exchanger. The initiator may include a low-temperature initiator and a high-temperature initiator where a ratio of the high-temperature initiator to the low-temperature initiator can range from about 0:600 to about 50:600.
Claims42
A method of producing a polymer, comprising:
- taking a product stream from a monovinyl aromatic polymerization system, said product stream comprising a polymerized monomer and a monomer;
- and
- introducing said product stream into an up-flow heat exchanger in a presence of a portion of an initiator introduced into a first reactor and introducing a remaining portion of said initiator into a second reactor prior to introducing said product stream into said up-flow heat exchanger, said initiator affecting a polymerization of said monomer.
A method of producing a polymer, comprising:
- taking a product stream from a monovinyl aromatic polymerization system, said product stream comprising a polymerized monomer and a monomer;
- and
- introducing said product stream into an up-flow heat exchanger in a presence of an initiator, wherein introducing said product stream into said up-flow heat exchanger includes introducing said initiator into said up-flow heat exchanger separately from said product stream, said initiator affecting a polymerization of said monomer.
A method of producing a polystyrene, comprising:
- taking a product stream from a styrene polymerization system, said product stream comprising polystyrene and styrene;
- and
- introducing said product stream into an up-flow heat exchanger in a presence of a portion of an initiator introduced into a first reactor and introducing a remaining portion of said initiator into a second reactor prior to introducing said product stream into said up-flow heat exchanger, said initiator affecting a polymerization of styrene.
A method of producing a polystyrene, comprising:
- taking a product stream from a monovinyl aromatic polymerization system, said product stream comprising a polymerized monomer and a monomer;
- and
- introducing said product stream into an up-flow heat exchanger in a presence of an initiator, wherein introducing said product stream into said up-flow heat exchanger includes introducing said initiator into said up-flow heat exchanger separately from said product stream, said initiator affecting a polymerization of said monomer.
Dependencies are inferred from the claim text.