Ethylene-based polymer, LDPE, is made in a high pressure polymerization process to comprising at least the step of polymerizing a reaction mixture comprising ethylene, using a reactor configuration comprising (A) at least two reaction zones, a first reaction zone (reaction zone 1) and an i reaction zone (reaction zone i where i>2), (B) at least two ethylene feed streams, each feed stream comprising a percentage of the total make-up ethylene fed to the polymerization process, in which a first ethylene feed stream is sent to reaction zone 1 and a second ethylene feed stream is sent to reaction zone i, and (C) a control system to control the percentage of the total make-up ethylene in the ethylene feed stream sent to reaction zone 1 and the percentage of the total make-up ethylene in the ethylene feed stream sent to reaction zone i.

To provide a process for producing a fluorinated polymer having a cyclic structure at a relatively low cost, by efficiently recovering, from a mixture containing a fluorinated polymer obtained by polymerizing a perfluoromonomer having a cyclic structure and an unreacted perfluoromonomer having a cyclic structure, the unreacted perfluoromonomer having a cyclic structure. A monomer component containing a perfluoromonomer having a specific cyclic structure is polymerized in the presence of a polymerization initiator at a predetermined polymerization temperature to obtain a mixture containing a fluorinated polymer and an unreacted cyclic structure monomer, and the perfluoromonomer having a cyclic structure is recovered from the mixture at a temperature of at most the maximum ultimate temperature of the polymerization temperature+12 C. and at most the 10 hour half-life temperature of the polymerization initiator+12 C. under a pressure of less than the atmospheric pressure.

To provide a process for producing a fluorinated polymer having a cyclic structure at a relatively low cost, by efficiently recovering, from a mixture containing a fluorinated polymer obtained by polymerizing a perfluoromonomer having a cyclic structure and an unreacted perfluoromonomer having a cyclic structure, the unreacted perfluoromonomer having a cyclic structure. A monomer component containing a perfluoromonomer having a specific cyclic structure is polymerized in the presence of a polymerization initiator at a predetermined polymerization temperature to obtain a mixture containing a fluorinated polymer and an unreacted cyclic structure monomer, and the perfluoromonomer having a cyclic structure is recovered from the mixture at a temperature of at most the maximum ultimate temperature of the polymerization temperature+12 C. and at most the 10 hour half-life temperature of the polymerization initiator+12 C. under a pressure of less than the atmospheric pressure.

An eductor, a process and apparatus for gas phase polymerization of olefins in a polymerization reactor are disclosed. The process and apparatus employ an eductor which has an inlet which makes a bend of less than about 90 toward the outlet after entering the mixing chamber of the eductor.

A process for the separation of at least one polyolefin from a product stream from a solution polymerization process, wherein the product stream comprises the at least one polyolefin and a mixture of volatiles, the process comprising the steps of separating the product stream into a first polyolefin-lean vapor stream and a first condensed polyolefin-rich stream; separating the first condensed polyolefin-rich stream into a second polyolefin-lean vapor stream and a second condensed polyolefin-rich stream; separating the second condensed first condensed polyolefin-rich stream into a last polyolefin-lean vapor stream and a last condensed polyolefin-rich stream; characterized in that the first polyolefin-lean vapor stream and the second polyolefin-lean vapor stream are introduced into an initial feed stream of the solution polymerization process without any further purification step.

A portable electric (battery) powered paint system designed to worn in a typical workman's tool belt and thus accompany the painter as he moves from wall to wall and room to room without the restriction of electrical cords plugged into wall outlets. The invention consists of a paint reservoir, an electric paint pump, a power pack of two or more 18 Volt batteries, a paint applicator and associated paint supply tubing for transfer of paint from the reservoir to the paint applicator. The invention provides the painter with a self-contained powered painting system.

A process for separating polymeric and gaseous components of a polymer-monomer mixture at a pressure of from 0.12 MPa to 0.6 MPa and a temperature of from 120 C. to 300 C. in a separation vessel is provided. The separation vessel has a vertically arranged cylindrical shape with a ratio of length to diameter L/D of from 0.6 to 10 and an inlet pipe capable of introducing the polymer-monomer mixture into the separation vessel which the inlet pipe extends vertically from the top of the separation vessel into the separation vessel. Further a process for preparing ethylene homopolymers or copolymers from ethylenically unsaturated monomers in the presence of free-radical polymerization initiators at temperatures from 100 C. to 350 C. and pressures in the range of from 110 MPa to 500 MPa comprising such a process for separating a polymer-monomer mixture is provided.

A method (100) is proposed for the preparation of a polyolefin from olefin monomers, wherein the olefin monomers are subjected to one or more polymerisation steps (13), in which a proportion of the olefin monomers are catalytically reacted to form the polyolefin, while the olefin monomers that are not reacted in the polymerisation step or steps (13) are at least partly transferred into one or more gaseous, monomer-containing purge streams (g, h), which additionally contain(s) one or more aluminium organic compounds, which comprise one or more co-catalysts used in the polymerisation step or steps (13) and/or one or more compounds formed from the co-catalyst(s). It is provided that, downstream of one or more olefin synthesis steps (21), the gaseous, monomer-containing purge stream or streams (g, h) are brought into contact with a crude gas mixture (p, r) formed using a product mixture from the olefin synthesis step or steps (21) and are subjected to a caustic wash (26) together with the crude gas mixture (p, r). The present invention also relates to a corresponding apparatus.

A method (100) is proposed for the preparation of a polyolefin from olefin monomers, wherein the olefin monomers are subjected to one or more polymerisation steps (13), in which a proportion of the olefin monomers are catalytically reacted to form the polyolefin, while the olefin monomers that are not reacted in the polymerisation step or steps (13) are at least partly transferred into one or more gaseous, monomer-containing purge streams (g, h), which additionally contain(s) one or more aluminium organic compounds, which comprise one or more co-catalysts used in the polymerisation step or steps (13) and/or one or more compounds formed from the co-catalyst(s). It is provided that, downstream of one or more olefin synthesis steps (21), the gaseous, monomer-containing purge stream or streams (g, h) are brought into contact with a crude gas mixture (p, r) formed using a product mixture from the olefin synthesis step or steps (21) and are subjected to a caustic wash (26) together with the crude gas mixture (p, r). The present invention also relates to a corresponding apparatus.

The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase in a reactor comprising a gas distributor (3), a reaction zone (5) and a fluidized bed (27), the gas leaving the reactor is treated in a condenser column (12) with an aqueous solution, the treated gas leaving the condenser column (12) is recycled at least partly to the fluidized bed (27), wherein the gas leaving the condenser column (12) comprises from 0.05 to 0.3 kg steam per kg dry gas and the steam content of the gas entering the gas distributor (3) is less than 80% of the steam content of the gas leaving the condenser column (12).