Component separations in polymerization
AssigneeChevron Phillips Chemical Company LP
InventorsScott E. Kufeld, John D. Hottovy, Ai-fu Chang
Life of this patent
Estimating the term…
Abstract
A process for component separation in a polymer production system, comprising separating a polymerization product stream into a gas stream and a polymer stream, wherein the gas stream comprises ethane and unreacted ethylene, distilling the gas stream into a light hydrocarbon stream, wherein the light hydrocarbon stream comprises ethane and unreacted ethylene, contacting the light hydrocarbon stream with an absorption solvent system, wherein at least a portion of the unreacted ethylene from the light hydrocarbon stream is absorbed by the absorption solvent system, and recovering a waste gas stream from the absorption solvent system, wherein the waste gas stream comprises ethane, hydrogen, or combinations thereof.
Claims18
A system comprising:
- a first polymerization reactor for polymerizing olefin monomers to yield a mid-polymerization product stream;
- a separator for separating the mid-polymerization product stream into a mid-gas stream and a mid-polymer stream;
- a second polymerization reactor for polymerizing the mid-polymer stream,
- wherein the mid-gas stream comprises ethane, unreacted ethylene, and hydrogen;
- and
- an absorption reactor for contacting the mid-gas stream with an absorption solvent system to absorb at least a portion of the unreacted ethylene from the mid-gas stream and to yield ethane in a waste gas stream.
A system comprising:
- a first polymerization reactor for polymerizing olefin monomers to yield a mid-polymerization product stream;
- a separator for separating the mid-polymerization product stream into a mid-gas stream and a mid-polymer stream;
- a second polymerization reactor for polymerizing the mid-polymer stream;
- and
- a scavenger stream for introducing a scavenger prior to the second polymerization reactor,
- wherein the mid-gas stream comprises unreacted ethylene and ethane.
A system comprising;
- a first polymerization reactor for polymerizing olefin monomers to yield a mid-polymerization product stream comprising hydrogen;
- a first separator for degassing at least a portion of the hydrogen from the mid-polymerization product stream to yield a hydrogen-reduced product stream;
- a second separator for separating the hydrogen-reduced product stream into a mid-gas stream and a mid-polymer stream;
- a second polymerization reactor for polymerizing the mid-polymer stream;
- wherein the mid-gas stream comprises unreacted ethylene and ethane;
- and
- an absorption reactor for contacting the mid-gas stream with an absorption solvent system to absorb at least a portion of the unreacted ethylene from the mid-gas stream and to yield ethane in a waste gas stream.
Dependencies are inferred from the claim text.