Abstract: This invention relates to a blocked process for producing polymers of high and low molecular weights utilizing the same polymer separator. The separator is operated in a different mode depending on the molecular weight of the polymer being produced such that the separation system is operated in flash mode for the separation of low molecular weight polymers and operated in lower critical solution temperature (LCST) mode for the separation of high molecular weight polymers.

Abstract: The disclosure provides a plant for the continuous solution polymerization of a feed comprising one or more olefin monomers in a solvent, e.g., hydrocarbon solvent, in which the plant comprises means for separating solvent from the polymer including a flash tank and a vacuum devolatilizer. The plant also includes in a first aspect stabilizer addition means for adding a stabilizer to the concentrated polymer fines at a location downstream of the flash and upstream of the vacuum devolatilizer. In another aspect the plant comprises means to add a molten stabilizer to the polymer at a location downstream of the reactors.

Abstract: A process for polymerizing olefins, comprising the steps of: (a) contacting in a dense-fluid-homogeneous-polymerization system (“PS”), >30 wt % C3+ olefins with: catalyst, activator, 0-50 mol % comonomer, and 0-40 wt % diluent/solvent, at a temperature > PS Tc and a pressure no lower than 1 MPa below the PS cloud point pressure and <200 MPa; (b) forming a reactor effluent comprising polymer-monomer mixture; (c) optionally heating the mixture (b); (d) collecting the mixture (b) in a separation vessel; (e) reducing the pressure to form a two-phase mixture where the pressure in the reactor is 7-100 MPa higher than the pressure in the separation vessel and the temperature in the separation vessel is > the polymer or above 80° C., whichever is higher; (f) separating the monomer-rich phase from the polymer-rich phase; (g) recycling the separated monomer-rich phase and recovering polymer from the polymer-rich phase.

Abstract: This invention relates to a process for polymerizing olefins, comprising the steps of: (a) contacting in one or more reactors, in a dense fluid homogeneous polymerization system, olefin monomers having three or more carbon atoms present at 30 weight % or more (based upon the weight of the monomers and comonomers entering the reactor), with: 1) one or more catalyst compounds, 2) one or more activators, 3) from 0 to 50 mole % comonomer (based upon the amount of the monomers and comonomers entering the reactor), and 4) 0 to 40 wt % diluent or solvent (based upon the weight of the polymerization system), at a temperature above the crystallization temperature of the polymerization system and a pressure no lower than 10 MPa below the cloud point pressure of the polymerization system and less than 200 MPa, where the polymerization system comprises the monomers, any comonomer present, any diluent or solvent present, any scavenger present, and the polymer product; (b) forming a reactor effluent comprising a polymer-mo

Abstract: This invention relates to a process to polymerize olefins comprising contacting propylene, at a temperature of 65° C. to 150° C. and a pressure of 1.72 to 34.

Abstract: The disclosure provides a plant for the continuous solution polymerization of a feed comprising one or more olefin monomers in a solvent, e.g., hydrocarbon solvent, in which the plant comprises means for separating solvent from the polymer including a flash tank and a vacuum devolatilizer. The plant also includes in a first aspect stabilizer addition means for adding a stabilizer to the concentrated polymer fines at a location downstream of the flash and upstream of the vacuum devolatilizer. In another aspect the plant comprises means to add a molten stabilizer to the polymer at a location downstream of the reactors.

Abstract: This invention relates to a process for polymerizing olefins, comprising the steps of: (a) contacting in one or more reactors, in a dense fluid homogeneous polymerization system, olefin monomers having three or more carbon atoms present at 30 weight % or more (based upon the weight of the monomers and comonomers entering the reactor), with: 1) one or more catalyst compounds, 2) one or more activators, 3) from 0 to 50 mole % comonomer (based upon the amount of the monomers and comonomers entering the reactor), and 4) 0 to 40 wt % diluent or solvent (based upon the weight of the polymerization system), at a temperature above the crystallization temperature of the polymerization system and a pressure no lower than 10 MPa below the cloud point pressure of the polymerization system and less than 200 MPa, where the polymerization system comprises the monomers, any comonomer present, any diluent or solvent present, any scavenger present, and the polymer product; (b) forming a reactor effluent comprising a polymer-mo

Abstract: This invention relates to processes and plants for continuous solution polymerization. Such plan and process include a pressure source, a polymerization reactor, downstream of said pressure source, pressure let-down device, downstream of said polymerization reactor, and a separator, downstream of said pressure let-down device, wherein said pressure source is sufficient to provide pressure to said reaction mixture during operation of said process plant to produce a single-phase liquid reaction mixture in said reactor and a two-phase liquid-liquid reaction mixture in said separator in the absence of an additional pressure source between said reactor and said separator.

Abstract: The invention relates to processes and plants for continuous solution polymerization. Such plant and processes include a pressure source, a polymerization reactor, downstream of said pressure source, pressure let-down device, downstream of said polymerization reactor, and a separator, downstream of said pressure let-down device, wherein said pressure source is sufficient to provide pressure to said reaction mixture during operation of said process plant to produce a single-phase liquid reaction mixture in said reactor and a two-phase liquid-liquid reaction mixture in said separator in the absence of an additional pressure source between said reactor and said separator.

Abstract: The invention relates to processes and plants for continuous solution polymerization. Such plant and processes include a pressure source, a polymerization reactor, downstream of said pressure source, pressure let-down device, downstream of said polymerization reactor, and a separator, downstream of said pressure let-down device, wherein said pressure source is sufficient to provide pressure to said reaction mixture during operation of said process plant to produce a single-phase liquid reaction mixture in said reactor and a two-phase liquid-liquid reaction mixture in said separator in the absence of an additional pressure source between said reactor and said separator.