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US 11,046,793 B2Granted
Silica quenching agents for use in polymerization process
AssigneeExxonMobil Chemical Patents Inc.
InventorsJay L. Reimers, Yifeng Hong, John R. Hagadorn
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Abstract
This disclosure describes polymerization processes and processes for quenching polymerization reactions using reactive particulates, such as amorphous silica, as quenching agents, typically in solution or bulk polymerization processes.
Claims12
A process for producing a polymer, wherein the process comprises:
- polymerizing a hydrocarbon monomer present in a solvent in the presence of a catalyst system under conditions to obtain a first effluent stream comprising a solution of the polymer and the solvent,
- introducing a quenching agent into the first effluent stream to quench a polymerization reaction, wherein the quenching agent comprises amorphous silica having a specific surface area from 30 to 800 m2/g,
- performing a separation on the first effluent stream to produce a second effluent stream comprising the quenching agent, and
- a recycle stream comprising the solvent, unreacted hydrocarbon monomer and optionally, the quenching agent,
- wherein the second effluent stream has a higher concentration of the quenching agent than the recycle stream,
- wherein the separation is a liquid-liquid separation.
3 more elements
A process for quenching a polymerization reaction, wherein the process comprises:
- introducing a quenching agent into a first effluent stream comprising polymer exiting a polymerization zone to quench the polymerization reaction, wherein the quenching agent comprises amorphous silica having a specific surface area from 50 to 500 m2/g, and
- performing a separation on the first effluent stream to produce a second effluent stream comprising the quenching agent, and
- a recycle stream comprising the solvent, unreacted hydrocarbon monomer and optionally, the quenching agent,
- wherein the second effluent stream has a higher concentration of the quenching agent than the recycle stream,
- wherein the separation is a liquid-liquid separation.
2 more elements
Dependencies are inferred from the claim text.