Component separations in polymerization
AssigneeChevron Phillips Chemical Company LP
InventorsScott E. Kufeld, John D. Hottovy, Ai-fu Chang
Life of this patent
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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 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, unreacted ethylene, and unreacted hexane;
- distilling the gas stream, in singe distillation column, into a light hydrocarbon stream and a bottoms stream, wherein the light hydrocarbon stream comprises ethane and unreacted ethylene, wherein the bottoms stream comprises isobutane, and wherein the bottoms stream is substantially olefin-free;
- 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.
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, unreacted ethylene, and one or more of oxygen, oxygenated compounds, and oxidizing compounds;
- distilling the gas stream into an intermediate hydrocarbon stream, a side stream, and a first bottoms stream, wherein the intermediate hydrocarbon stream comprises ethane, ethylene, and isobutane, wherein the side stream comprises hexane, and wherein the first bottoms stream comprises hexane;
- distilling the intermediate hydrocarbon stream into a light hydrocarbon stream and a second bottoms stream, wherein the light hydrocarbon stream comprises ethane and 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.
Dependencies are inferred from the claim text.