A system including a dump tank to receive a reactor product comprising a polymer and hydrocarbons, including liquid hydrocarbons, the dump tank including a vessel with a reactor product inlet, a motive gas inlet, a purge gas inlet, gas outlet(s), and a fluid outlet, the motive gas inlet for introducing a motive gas into the vessel, the purge gas inlet for introducing a purge gas into the vessel, the one or more gas outlets located at a top of the vessel and the fluid outlet located at a bottom of the vessel and fluidly connected with a dump tank fluid outlet line having a dump tank outlet valve to control flow of fluid out of the dump tank via the fluid outlet; and a strainer fluidly connected with the dump tank fluid outlet line to allow passage of liquid hydrocarbons therethrough into a hydrocarbon outlet line.

A system including a dump tank to receive a reactor product comprising a polymer and hydrocarbons, including liquid hydrocarbons, the dump tank including a vessel with a reactor product inlet, a motive gas inlet, a purge gas inlet, gas outlet(s), and a fluid outlet, the motive gas inlet for introducing a motive gas into the vessel, the purge gas inlet for introducing a purge gas into the vessel, the one or more gas outlets located at a top of the vessel and the fluid outlet located at a bottom of the vessel and fluidly connected with a dump tank fluid outlet line having a dump tank outlet valve to control flow of fluid out of the dump tank via the fluid outlet; and a strainer fluidly connected with the dump tank fluid outlet line to allow passage of liquid hydrocarbons therethrough into a hydrocarbon outlet line.

A polybutadiene composition that is excellent in hardness of a rubber composition, in processability and extrusion dimensional stability, and in physical properties. The polybutadiene composition includes polybutadiene rubber and syndiotactic-1,2-polybutadiene, and the polybutadiene composition has an interfacial component between the polybutadiene rubber and the syndiotactic-1,2-polybutadiene, and the interfacial component has a thickness of 40 to 55 nm as measured by an atomic force microscope.

A polybutadiene composition that is excellent in hardness of a rubber composition, in processability and extrusion dimensional stability, and in physical properties. The polybutadiene composition includes polybutadiene rubber and syndiotactic-1,2-polybutadiene, and the polybutadiene composition has an interfacial component between the polybutadiene rubber and the syndiotactic-1,2-polybutadiene, and the interfacial component has a thickness of 40 to 55 nm as measured by an atomic force microscope.

A polybutadiene composition that is excellent in hardness of a rubber composition, in processability and extrusion dimensional stability, and in physical properties. The polybutadiene composition includes polybutadiene rubber and syndiotactic-1,2-polybutadiene, and the polybutadiene composition has an interfacial component between the polybutadiene rubber and the syndiotactic-1,2-polybutadiene, and the interfacial component has a thickness of 40 to 55 nm as measured by an atomic force microscope.

A method of separating a polyisoolefin elastomer from non-polymeric components in an organic solvent involves ultrafiltration of a solution of the polyisoolefin elastomer and non-polymeric components in an organic solvent through a semipermeable membrane to substantially retain the polyisoolefin elastomer in a retentate and provide the non-polymeric components in a permeate. Advantageously, stabilizers for the polyisoolefin elastomer are retained in the retentate along with the polyisoolefin elastomer, permeate flux through the membrane is higher as concentration of the polyisoolefin elastomer in the solution increases up to a concentration limit, the separated polyisoolefin elastomer in the retentate has a molecular weight that can be substantially unchanged even when ultrafiltration is conducted at elevated temperature and the amount of polyisoolefin elastomer in the permeate is unmeasurable providing an oligomer-rich permeate uncontaminated by polyisoolefin elastomer. A process for curing a polyisoolefin copolymer involves reducing content of an oligomer to 900 ppm or less in a mixture of the oligomer and the polyisoolefin copolymer to produce an oligomer-depleted mixture, and adding a resin cure system to the oligomer-depleted mixture to cure the polyisoolefin copolymer.

A method of separating a polyisoolefin elastomer from non-polymeric components in an organic solvent involves ultrafiltration of a solution of the polyisoolefin elastomer and non-polymeric components in an organic solvent through a semipermeable membrane to substantially retain the polyisoolefin elastomer in a retentate and provide the non-polymeric components in a permeate. Advantageously, stabilizers for the polyisoolefin elastomer are retained in the retentate along with the polyisoolefin elastomer, permeate flux through the membrane is higher as concentration of the polyisoolefin elastomer in the solution increases up to a concentration limit, the separated polyisoolefin elastomer in the retentate has a molecular weight that can be substantially unchanged even when ultrafiltration is conducted at elevated temperature and the amount of polyisoolefin elastomer in the permeate is unmeasurable providing an oligomer-rich permeate uncontaminated by polyisoolefin elastomer. A process for curing a polyisoolefin copolymer involves reducing content of an oligomer to 900 ppm or less in a mixture of the oligomer and the polyisoolefin copolymer to produce an oligomer-depleted mixture, and adding a resin cure system to the oligomer-depleted mixture to cure the polyisoolefin copolymer.

A system including a dump tank to receive a reactor product comprising a polymer and hydrocarbons, including liquid hydrocarbons, the dump tank including a vessel with a reactor product inlet, a motive gas inlet, a purge gas inlet, gas outlet(s), and a fluid outlet, the motive gas inlet for introducing a motive gas into the vessel, the purge gas inlet for introducing a purge gas into the vessel, the one or more gas outlets located at a top of the vessel and the fluid outlet located at a bottom of the vessel and fluidly connected with a dump tank fluid outlet line having a dump tank outlet valve to control flow of fluid out of the dump tank via the fluid outlet; and a strainer fluidly connected with the dump tank fluid outlet line to allow passage of liquid hydrocarbons therethrough into a hydrocarbon outlet line.

A system including a dump tank to receive a reactor product comprising a polymer and hydrocarbons, including liquid hydrocarbons, the dump tank including a vessel with a reactor product inlet, a motive gas inlet, a purge gas inlet, gas outlet(s), and a fluid outlet, the motive gas inlet for introducing a motive gas into the vessel, the purge gas inlet for introducing a purge gas into the vessel, the one or more gas outlets located at a top of the vessel and the fluid outlet located at a bottom of the vessel and fluidly connected with a dump tank fluid outlet line having a dump tank outlet valve to control flow of fluid out of the dump tank via the fluid outlet; and a strainer fluidly connected with the dump tank fluid outlet line to allow passage of liquid hydrocarbons therethrough into a hydrocarbon outlet line.

To provide a method for producing an aqueous liquid containing a vinyl polymer, of which the production efficiency is high, without lowering the yield of the vinyl polymer.

When removing a hydrophilic organic solvent from a mixed liquid comprising a vinyl polymer, the hydrophilic organic solvent and water to produce an aqueous liquid containing the vinyl polymer, a liquid phase and a gas phase are formed in a closed container, a part of the liquid of the liquid phase is formed into small droplets and brought into contact with the gas phase to vaporize the hydrophilic organic solvent, and the vaporized hydrophilic organic solvent is removed from the closed container. Specifically, for example, a closed container 10 having a liquid inlet 22, a gas outlet 30, a liquid outlet 21, a liquid inlet 22 and a liquid outlet 21 which are connected and having an external circulating system provided with means to control the temperature and the pressure of liquid, is filled with a mixed liquid 40 to form a liquid phase 50 and a gas phase 51, the mixed liquid 40 of the liquid phase 50 is circulated from the liquid outlet 21 to the external circulating system 20, and the temperature and the pressure of the mixed liquid 41 in the external circulating system 20 are controlled to conditions such that the hydrophilic organic solvent is easily vaporized in liquid droplets in the gas phase 51, followed by discharging the mixed liquid 41 in the form of the small droplets from the liquid inlet 22 to the gas phase 51 and draining the gas in the gas phase 51 from the gas outlet 30.