Provided are an extractant for ultra-high molecular weight PE fibers and membranes, and methods of preparing and applying the same, relating to the technical field of polyethylene preparation. An extractant for ultra-high molecular weight PE fibers and membranes comprises an ionic liquid, which is one or more of an imidazolium tetrafluoroborate salt, a betaine salt, an imidazolium acetate salt, an imidazolium dicyanamide salt, an imidazolium ethyl sulfate salt, an imidazolium bis (fluorosulfonyl) imide salt and a bis((trifluoromethyl) sulfonyl) imide salt. The extractant of the present invention is characterized by a reasonable and scientific formula, high dispersibility and stability, a good degreasing effect on ultra-high molecular weight polyethylene fibers and membranes and excellent effects of subsequent separation and recycle of white oil, and has the advantages of convenient preparation of raw materials, simple process steps, low requirements for apparatuses, high operability, and suitable for industrial production.

Provided are an extractant for ultra-high molecular weight PE fibers and membranes, and methods of preparing and applying the same, relating to the technical field of polyethylene preparation. An extractant for ultra-high molecular weight PE fibers and membranes comprises an ionic liquid, which is one or more of an imidazolium tetrafluoroborate salt, a betaine salt, an imidazolium acetate salt, an imidazolium dicyanamide salt, an imidazolium ethyl sulfate salt, an imidazolium bis (fluorosulfonyl) imide salt and a bis((trifluoromethyl) sulfonyl) imide salt. The extractant of the present invention is characterized by a reasonable and scientific formula, high dispersibility and stability, a good degreasing effect on ultra-high molecular weight polyethylene fibers and membranes and excellent effects of subsequent separation and recycle of white oil, and has the advantages of convenient preparation of raw materials, simple process steps, low requirements for apparatuses, high operability, and suitable for industrial production.

A gas phase polymerization assembly comprising a gas phase polymerization reactor having at least one inlet and at least one outlet, a circulation gas compression unit having an inlet and an outlet, whereby the inlet of the circulation gas compression unit is fluidly connected to the at least one outlet of the gas phase polymerization reactor by an unreacted gas line; a flush gas compression unit having an inlet and an outlet, wherein the inlet of the flush gas compression unit is fluidly connected to the outlet of the circulation gas compression unit by a pressurized unreacted gas line; a circulation line fluidly connecting the pressurized unreacted gas line with the at least one inlet of the gas phase polymerization reactor; a flush gas withdrawal line connected to the outlet of the flush gas compression unit.

A method for producing a (meth)acrylic resin composition, the method comprising continuously feeding a polymerizable monomer component comprising 50 to 100% by mass of methyl methacrylate, 0 to 20% by mass of an acrylic acid alkyl ester and 0 to 30% by mass of an additional monomer, a chain transfer agent, and a radical polymerization initiator to a tank reactor; conducting bulk polymerization of the polymerizable monomer component at a polymerization conversion ratio of 40 to 70% by mass to obtain a liquid containing a (meth)acrylic resin; continuously feeding the liquid to a vented extruder to separate a volatile component from the (meth)acrylic resin; continuously feeding the separated volatile component to a distillation column to obtain a fraction containing methyl methacrylate; adding a polymerization inhibitor to the fraction; and reusing the fraction which contains the polymerization inhibitor as part of the polymerizable monomer component.

A process, for recovery of unreacted olefin monomer(s) from a particulate product of an olefin polymerization reactor, the particulate polymer product is supplied to a degassing vessel, where the particulate product is countercurrently contacted with at least a first gaseous stripping stream, which includes at least 5% by weight unreacted olefin monomer, and then with an inert gas stream under conditions effective to strip hydrocarbon impurities from the polymer product and produce a stripped polymer product, is provided.

A process, for recovery of unreacted olefin monomer(s) from a particulate product of an olefin polymerization reactor, the particulate polymer product is supplied to a degassing vessel, where the particulate product is countercurrently contacted with at least a first gaseous stripping stream, which includes at least 5% by weight unreacted olefin monomer, and then with an inert gas stream under conditions effective to strip hydrocarbon impurities from the polymer product and produce a stripped polymer product, is provided.

A method for recovering a hydrofluorocarbon, including: producing a wet fluoropolymer by suspension polymerization, solution polymerization, or bulk polymerization in the presence of a hydrofluorocarbon; vaporizing and discharging vaporizable substances including the hydrofluorocarbon by heating the wet fluoropolymer in a container; and transferring the discharged vaporizable substances to a cooling means to cool the substances.

The present invention discloses a valorisation method of a flux containing undesired lactic acid (ester(s)) in the production process of polylactic acid. the lactic acid and/or the lactic acid ester(s) obtained by recycling during the various stage of the production of poly lactic acid are forming a recycle stream, 0 to 100% by weight of which are subjected to a treatment in order to selectively separate a fraction containing L-lactic acid and/or L-lactic acid ester(s) from a fraction containing D-lactic acid and/or D-lactic acid ester(s); and 100 to 0% by weight of said recycle stream are used as a base for the synthesis of molecules insensitive to the optical isometry D or L of lactic acid and/or of lactic acid ester(s).

The present invention discloses a valorisation method of a flux containing undesired lactic acid (ester(s)) in the production process of polylactic acid. the lactic acid and/or the lactic acid ester(s) obtained by recycling during the various stage of the production of poly lactic acid are forming a recycle stream, 0 to 100% by weight of which are subjected to a treatment in order to selectively separate a fraction containing L-lactic acid and/or L-lactic acid ester(s) from a fraction containing D-lactic acid and/or D-lactic acid ester(s); and 100 to 0% by weight of said recycle stream are used as a base for the synthesis of molecules insensitive to the optical isometry D or L of lactic acid and/or of lactic acid ester(s).

A process for agglomerating superabsorbent particles, wherein polymer particles having a particle size of 250 m or less are dispersed in a hydrophobic organic solvent, the dispersed polymer particles are mixed with an aqueous monomer solution, the amount of unneutralized monomer applied with the monomer solution being from 0.5% to 80% by weight, based on the dispersed polymer particles, and the monomer solution is polymerized.