Back to results
US 11,708,434 B2Granted
Silica quenching agents for use in polymerization process
AssigneeExxonMobil Chemical Patents Inc.
InventorsJay L. Reimers, Yifeng Hong, John R. Hagadorn
Life of this patent
Estimating the term…
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.
Claims20
A process for polymerization, comprising:
- polymerizing a hydrocarbon monomer in the presence of a solvent and a catalyst system within a polymerization zone under conditions to obtain a first effluent stream comprising polymer, catalyst, unreacted hydrocarbon monomer and the solvent;
- introducing a quenching agent into the first effluent stream to quench polymerization, wherein the quenching agent comprises amorphous silica having a specific surface area from 30 to 800 m2/g;
- separating the first effluent stream to provide a second effluent stream comprising the polymer and the quenching agent and a third stream comprising the solvent, the unreacted hydrocarbon monomer and optionally, the quenching agent,
- wherein the second effluent stream has a higher concentration of the quenching agent than the third stream;
- and
- recycling the third steam to the polymerization zone.
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 polymerization, 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 provide:
- a second effluent stream comprising the quenching agent;
- and
- a third 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 third stream;
- and
- recycling the third steam to the polymerization zone.
6 more elements
A process for solution polymerization comprising:
- polymerizing one or more hydrocarbon monomers in the presence of a solvent and a catalyst system within a polymerization zone;
- removing a first effluent comprising a solution of polymer, catalyst and the solvent from the polymerization zone;
- introducing a quenching agent into the first effluent to quench polymerization, wherein the quenching agent comprises amorphous silica having a specific surface area from 30 to 800 m2/g;
- separating the first effluent to provide a second effluent comprising the quenching agent and the polymer and a third effluent comprising the solvent, unreacted hydrocarbon monomers and optionally, the quenching agent,
- wherein the second effluent has a higher concentration of the quenching agent than the third effluent;
- and
- recycling the third effluent to the polymerization zone.
4 more elements
Dependencies are inferred from the claim text.