Abstract: Embodiments disclosed herein relate to the production of polypropylene. At least one olefin monomer stream (10, 12) is fed to a polymerization zone (2). A recirculation gas stream (31) is withdrawn therefrom, compressed into a compressor (4), cooled in a first heat exchanger (5), separated in a phase separator (6), flashed in a pressure regulator (7), fed to a second heat exchanger (8), and recycled (83) to the polymerization zone (2).

Abstract: A propylene copolymer composition includes a propylene copolymer of propylene from 70 to 95 wt % and at least two ?-olefin comonomers from 3.0 to 25 wt %. The ?-olefin comonomer with a lower molar mass may be included from 0.3 to 10 wt %. The propylene copolymer composition may have a melt flow rate (MFR) in a range from 5.4 to 250 g/10 min, a polydispersity index (PI) in a range from 1.0 to 3.7, and an analytical temperature rising elution fractionation full width at half maximum (ATREF FWHM) in a range from 1.0 to 15.4° C. The method includes reacting propylene and at least two ?-olefin comonomers in one or more vertically-stirred gas phase reactors, extruding with additives, and optionally visbreaking to produce a propylene copolymer composition.

Abstract: Embodiments disclosed herein relate to the production of polypropylene. A propylene stream comprising propane is fed to a gas-phase polymerization zone. Propylene is reacted in the gas phase polymerization zone to produce a polymerization product. A recycle gas stream from the gas-phase polymerization zone is fed to a heat exchanger to remove heat of the polymerization reaction, forming a first cooled gas stream, which is recycled to the gas-phase polymerization zone, and a second cooled gas stream from the heat exchanger is fed to a first separation system, forming a propane rich stream and a second propylene stream. The first separation system is operated by a heat pump configured to compress the second propylene stream to form an at least partially condensed propylene stream. A liquid portion and optionally a vapor portion of the at least partially condensed propylene stream are fed to the gas-phase polymerization zone.

Abstract: A centric spray pipe apparatus is disclosed, The centric spray pipe includes a plurality of nozzles designed to provide full coverage of liquid spray to a vessel.

Abstract: The present disclosure relates to a polymer blend comprising a composition comprising one or more polypropylene-based polymers and one or more additives and having selected properties, and at least one recycled polymer. Moreover, the present disclosure relates to a method of preparing the polymer blend, to a composition as defined above, to uses of the composition in a polymer blend, and to an article comprising the composition or the polymer blend.

Abstract: The disclosure relates to a method for producing a propylene copolymer, comprising extruding a molten propylene copolymer and a composition essentially comprising at least one peroxydicarbonate and at least one organic peroxide. Extruding is performed by extruding the propylene copolymer, adding the composition to the propylene copolymer, and melt extruding the propylene copolymer in the presence of the composition.

Abstract: The disclosure relates to a method and a system for feeding a liquid organic peroxide to a polymer melt processing equipment. The feeding method comprises transporting at least one liquid organic peroxide (13) in undissolved admixture with an inert liquid cooling carrier (4) from a controlled-temperature section (3) to a polymer melt processing equipment.

Abstract: The disclosure relates to a method for modifying the optical appearance of a polymer, the method comprising extruding a molten polymer comprising polypropylene and a composition comprising acid scavengers consisting of zinc oxide and zinc carbonate.

Abstract: A vertical rod baffle heat exchanger may be used for heat removal, condensation operations, electricity generation, petrochemical plants, waste heat recovery, and other industrial applications. The vertical rod baffle heat exchanger may include a shell; a tube-sheet; a tube bundle having a plurality of heat exchange tubes extending in an axial direction; six or more longitudinal partition plates; and a plurality of rod baffle rings provided along an axial length of the plurality of heat exchange tubes. At least one longitudinal partition plate may be a notched longitudinal partition plate. The plurality of rod baffle rings may have lateral rod baffles and longitudinal rod baffles. The lateral rod baffles and the longitudinal rod baffles may pass through gaps between every two adjacent tubes of plurality of heat exchange tubes. The lateral rod baffles may pass through openings in the notched longitudinal partition plate.

Abstract: The disclosure relates to a method for modifying the rheology of a polymer and a polymeric composition obtained by the method. The composition comprises at least one organic peroxide and water in emulsion form. The polymer may comprise a polyolefin. The method comprises extruding a molten polymer and the composition and removing volatile compounds from the molten polymer.

Abstract: A process and printer systems for printing a three-dimensional object are disclosed. The processes may include providing a non-crosslinked peroxydicarbonate-branched polypropylene filament, flake, pellet, or powder adapted for one of a fused deposition modeling (Arburg Plastic Freeforming) printer or a fused filament fabrication printer; and printing the non-crosslinked peroxydicarbonate-branched polypropylene with fused deposition modeling (Arburg Plastic Freeforming) printer or a fused filament fabrication printer to form a three-dimensional article. The printer systems may include one or more print heads for printing a polymer provided in filament, powder, flake, or pellet form to form a three-dimensional article; and one or more feed systems for providing a non-crosslinked peroxydicarbonate-branched polypropylene to a respective print head.

Abstract: A process and printer systems for printing a three-dimensional object are disclosed. The processes may include providing a non-crosslinked peroxydicarbonate-branched polypropylene filament, flake, pellet, or powder adapted for one of a fused deposition modeling (ARBURG Plastic Freeforming) printer or a fused filament fabrication printer; and printing the non-crosslinked peroxydicarbonate-branched polypropylene with fused deposition modeling (ARBURG Plastic Freeforming) printer or a fused filament fabrication printer to form a three-dimensional article. The printer systems may include one or more print heads for printing a polymer provided in filament, powder, flake, or pellet form to form a three-dimensional article; and one or more feed systems for providing a non-crosslinked peroxydicarbonate-branched polypropylene to a respective print head.

Abstract: A centric spray pipe apparatus is disclosed, The centric spray pipe includes a plurality of nozzles designed to provide full coverage of liquid spray to a vessel.

Abstract: The disclosure relates to a method for producing a propylene copolymer, comprising extruding a molten propylene copolymer and a composition essentially comprising at least one peroxydicarbonate and at least one organic peroxide. Extruding is performed by extruding the propylene copolymer, adding the composition to the propylene copolymer, and melt extruding the propylene copolymer in the presence of the composition.

Abstract: The disclosure relates to a method for modifying the rheology of a polymer and a polymeric composition obtained by the method. The composition comprises at least one organic peroxide and water in emulsion form. The polymer may comprise a polyolefin. The method comprises extruding a molten polymer and the composition and removing volatile compounds from the molten polymer.

Abstract: The disclosure relates to a method for modifying the rheology of a polymer and a polymeric composition obtained by the method. The composition comprises at least one organic peroxide and water in emulsion form. The polymer may comprise a polyolefin. The method comprises extruding a molten polymer and the composition and removing volatile compounds from the molten polymer.

Abstract: Improved Ziegler-Natta catalysts and methods of making the improved catalyst are described. The Ziegler-Natta catalyst is formed using a spherical MgCl2-xROH support, where R is a linear, cyclic or branched hydrocarbon unit with 1-10 carbon atoms and where ROH is an alcohol or a mixture of at least two different alcohols and where x has a range of about 1.5 to 6.0, preferably about 2.5 to 4, more preferably about 2.9 to 3.4, and even more preferably 2.95 to 3.35. The Ziegler-Natta catalyst includes a Group 4-8 transition metal and an internal donor. The catalyst has improved activity in olefin polymerization reactions as well as good stereoregularity and hydrogen sensitivity.

Abstract: A catalyst system for the polymerization of olefins may include a first solid catalytic component and a second solid catalytic component. The first solid catalytic component may include: a spherical MgCl2-xROH support; a group 4-8 transition metal; and a diether internal electron donor. The second solid catalytic component may include: a spherical MgCl2-xROH support; a group 4-8 transition metal; and a diether internal electron donor. The first solid catalytic component produces a propylene homopolymer having a Xylene Solubles (XS) value of greater than 2 wt %; and the second solid catalytic component produces a propylene homopolymer having a XS value of less than 2 wt %. The second catalytic component may act as an external electron donor during use, and embodiments herein do not require use of any additional external electron donors to control polymerization and reliably vary the properties of the resulting polymer.

Abstract: Improved Ziegler-Natta catalysts and methods of making the improved catalyst are described. The Ziegler-Natta catalyst is formed using a spherical MgCl2-xROH support, where R is a linear, cyclic or branched hydrocarbon unit with 1-10 carbon atoms and where ROH is an alcohol or a mixture of at least two different alcohols and where x has a range of about 1.5 to 6.0, preferably about 2.5 to 4, more preferably about 2.9 to 3.4, and even more preferably 2.95 to 3.35. The Ziegler-Natta catalyst includes a Group 4-8 transition metal and an internal donor comprising a diether compound. The catalyst has improved activity in olefin polymerization reactions as well as good stereoregularity and hydrogen sensitivity, and may be useful in the production of phthalate-free propylene polymers having a molecular weight distribution (PI(GPC)) in the range from about 5.75 to about 9.

Abstract: A method for making a solid catalyst component for use in a Ziegler-Natta catalyst includes combining in a hydrocarbon solvent a porous particulate support with a hydrocarbon soluble organomagnesium compound to form a suspension. The organomagnesium compound is halogenated followed by addition of an alcohol and the mixture is then reacted with a titanium compound followed by a reaction with at least one diether compound to form the solid catalyst component. Afterwards the reaction product is extracted with a mixture of a titanium compound and a hydrocarbon solvent. The solid catalyst component recovered is combined with an aluminum cocatalyst to form a Ziegler-Natta catalyst system for the polymerization of olefins. In particular, the catalyst system including a diether internal electron donor may have an activity and hydrogen response suitable for the production of propylene polymers having a molecular weight distribution (PI(GPC)) in the range from about 5.75 to about 9.