Abstract: A pressurizing centrifugal dehydrator for removing moisture according to the present disclosure includes: an inner basket into which slurry is introduced; an outer basket surrounding the inner basket; a blocking barrier disposed in the outer basket; and a gas supplying portion for supplying gas into the inner basket and/or the outer basket, wherein a dehydration product is positioned between an outer circumference of the blocking barrier and an inner side of the outer basket to maintain airtightness of the outer basket.

Abstract: A pressurizing centrifugal dehydrator for removing moisture includes: an inner basket into which slurry is introduced; an outer basket surrounding the inner basket; a pressurization chamber disposed in the outer basket; and a gas supplying portion for supplying gas into the pressurization chamber, wherein the gas supplied to the pressurization chamber is ejected from the pressurization chamber toward a dehydration product positioned between the outer basket and the pressurization chamber.

Abstract: Provided is a method of preparing a polymer including: supplying a monomer stream and a solvent stream to a reactor and performing a polymerization reaction to prepare a reaction product; supplying a reactor discharge stream to a volatilization device, separating a polymer from a lower portion of the volatilization device, splitting an upper discharge stream including an unreacted monomer, a solvent, and an inert gas into two or more streams, and divisionally supplying the split streams to a plurality of condensers, respectively; condensing and separating the unreacted monomer and the solvent in each of the condensers and supplying a gaseous stream therefrom to a condenser installed at a rear end of each condenser; and supplying a gaseous stream discharged from a condenser installed at the rearmost end to a vacuum unit.

Abstract: The present invention relates to a method for preparing ethylene vinylacetate copolymer that can improve the mechanical strength of copolymer by controlling the polymerization conditions using an autoclave reactor.

Abstract: Disclosed is a compression type dehydrator including: an upper plate that includes a pressurizing portion and a first guide adjacent to the pressurizing portion and spaced apart from the pressurizing portion, and performs a vertical movement by a hydraulic cylinder; a feed plate that includes a hollow portion and a first guide groove surrounding the hollow portion and guiding the vertical movement of the first guide, and is positioned on a lower portion of the upper plate; a slurry supply line connected to the feed plate; a lower plate positioned on a lower portion of the feed plate and having a plurality of holes formed therein; and a dehydration means including a filtration belt positioned in close contact with an upper portion of the lower plate.

Abstract: Disclosed is a continuous centrifugal dewatering device including an external case having an internal space, a feed supply pipe to which a slurry as a mixture of a solid and a liquid is supplied, a basket provided inside the external case, a plurality of holes formed in the basket, a pusher plate provided inside the basket and configured to discharge a slurry cake attached to an inner circumferential surface of the basket to the outside of the external case, a non-contact seal configured to prevent the first gas from flowing into a space between the external case and the basket, and a gas inlet to which a second gas, which flows in a reverse direction with respect to a flow direction of the first gas flowing to the space between the external case and the basket, is supplied.

Abstract: Provided is a method of predicting fouling during a process of preparing polyolefin. According to the present invention, occurrence of fouling may be predicted by calculating R value according to the following Equation 1 in real-time with high reliability during a copolymerization process of preparing polyolefin: R (ratio of unreacted alpha-olefin comonomer to produced polyolefin polymer) =amount of unreacted alpha-olefin comonomer (unit: kg/hr) / amount of produced polyolefin polymer (unit: kg/hr) ??[Equation 1] Therefore, productivity of the polyolefin preparation process may be further increased.

Abstract: The present invention relates to a method of preparing an aromatic vinyl compound-vinyl cyanide compound polymer including a step of separating volatile components from a polymerization product containing an aromatic vinyl compound-vinyl cyanide compound polymer, a residual aromatic vinyl monomer, a residual vinyl cyanide monomer, and an organic solvent using a volatilization tank, and a step of condensing the separated volatile components using a condenser, wherein an organic solvent or an aromatic vinyl monomer is sprayed onto the volatile components being transferred to the condenser. Volatile components may be fully condensed in a condenser, thereby significantly reducing the amount of volatile components discharged to the outside without being condensed. Therefore, wastewater treatment costs consumed in treating the volatile components may be reduced, and the amount of vinyl cyanide monomers harmful to the human body discharged into the atmosphere may be significantly reduced.

Abstract: The present disclosure relates to a stripping device and a stripping method, and more particularly, to a stripping device including: a distillation column of which at least a part or the entirety of a lower portion is perforated; a stripping vessel integrally connected to the lower portion of the distillation column; and one or more spray nozzles provided at an upper portion of the stripping vessel, and a stripping method using the same.

Abstract: A method for predicting physical properties of a polyethylene resin is provided, which can reliably predict a proper charging ratio of a crosslinking agent in the production process of a low density crosslinked polyethylene resin, and the physical properties of the polyethylene resin achieved therefrom. A method for producing a polyethylene resin by applying the same method is also provided.

Abstract: The present invention relates to an olefinic monomer recovery device capable of suppressing fouling and pressure drop in the recovery device in a process of separating and recovering unreacted monomers after production of a polyolefin resin. The olefinic monomer recovery device is used for separating and recovering unreacted olefinic monomers after production of a polyolefin resin, the apparatus comprising a vertical-type heat exchange unit, and a knock-out drum unit.

Abstract: Provided is a method for purifying a waste solvent by removing carbon dioxide contained in a waste solvent derived from supercritical waste liquid generated after supercritical drying by a decompression process, and removing ammonia by a multi-stage distillation process to obtain a solvent of high purity, which can be reused in producing silica aerogel or a silica aerogel blanket.

Abstract: Provided is a method of preparing a polymer including: supplying a monomer stream and a solvent stream to a reactor and performing a polymerization reaction to prepare reaction product; supplying a reactor discharge stream to a separation device, separating a gaseous stream including an inert gas in the separation device, and supplying a liquid stream including the reaction product from which the inert gas is removed to a volatilization device; separating a polymer from a lower discharge stream from the volatilization device and supplying an upper discharge stream including an unreacted monomer, a solvent, and an inert gas to a condensation unit; and condensing and separating the unreacted monomer and the solvent in the condensation unit and supplying a gaseous stream to a vacuum unit.

Abstract: A centrifugal dehydrator according to an embodiment of the present disclosure for solving the above problems includes: a slurry flow tube through which slurry, in which polymers and water are mixed, flows; a gas flow tube through which a gas flows; a mixture flow tube which is connected from the slurry flow tube and the gas flow tube and through which a mixture of the slurry and the gas flows; a basket into which the mixture is injected from the mixture flow tube and which rotates to apply centrifugal force to the slurry in the mixture; a driving part that allows the basket to rotate; and a porous plate disposed on a peripheral portion of the basket to discharge the water from the slurry to the outside of the basket.

Abstract: A method of preparing an aromatic vinyl compound-vinyl cyanide compound polymer includes polymerizing a reaction mixture containing an aromatic vinyl compound, a vinyl cyanide compound, and an organic solvent in a reactor and transferring the vaporized reaction mixture present in the upper space of the reactor to a heat exchanger via a pipe and condensing the vaporized reaction mixture. The condensed reaction mixture is transferred to one side of the pipe and sprayed into the pipe, the flow velocity of the reaction mixture vaporized in the reactor is reduced, and temperature is lowered. Accordingly, a phenomenon wherein polymer particles in a reactor are sucked into a heat exchanger is prevented, and occurrence of polymerization in the heat exchanger is suppressed. Therefore, productivity and quality may be improved.

Abstract: A pressurizing centrifugal dehydrator for removing moisture according to the present disclosure includes: an inner basket into which slurry is introduced; an outer basket surrounding the inner basket; a blocking barrier disposed in the outer basket; and a gas supplying portion for supplying gas into the inner basket and/or the outer basket, wherein a dehydration product is positioned between an outer circumference of the blocking barrier and an inner side of the outer basket to maintain airtightness of the outer basket.

Abstract: The present invention provides a method for producing a polyethylene resin in which gel or fish eye formation is greatly reduced, by controlling various reaction conditions such as the supply flow rate ratio of the monomers to each reactor, the temperature range of each reactor, and the temperature range of the mixing region, in the method for producing a polyethylene resin which is applied to produce a polyethylene resin for a protective film of display.

Abstract: A pressurizing centrifugal dehydrator for removing moisture includes: an inner basket into which slurry is introduced; an outer basket surrounding the inner basket; a pressurization chamber disposed in the outer basket; and a gas supplying portion for supplying gas into the pressurization chamber, wherein the gas supplied to the pressurization chamber is ejected from the pressurization chamber toward a dehydration product positioned between the outer basket and the pressurization chamber.

Abstract: A photopolymerization reaction system according to an embodiment of the present disclosure may include: a housing; a UV lamp disposed within the housing; a UV light-transmitting plate disposed below the UV lamp; a ventilation part configured to receive supply and discharge therethrough of a first flow of air for heat removal from the UV lamp; and an air injection module configured to inject a second flow of air into the housing between the UV light-transmitting plate and the reactant, the air injection module being configured to prevent the UV light-transmitting plate from being contaminated by by-products generated by a photopolymerization reaction in which a reactant is supplied below the UV light-transmitting plate.

Abstract: A separation method and a separation apparatus for a solvent extracted by supercritical extraction. The separation method increases a solvent recovery rate by minimizing the amount of a solvent to be evaporated and lost since the pressure of a solvent is reduced by arranging two or more separators in series. The method includes: introducing a fluid having passed through a supercritical extractor into a first flash vessel; introducing the fluid which has passed through the first flash vessel into a second flash vessel; and discharging and recovering the carbon dioxide and the solvent which have passed through the second flash vessel, respectively. The pressure of the first flash vessel is 40-100 bar, and the pressure of the second flash vessel is 1-30 bar. The fluid includes carbon dioxide and a solvent.