Abstract: Disclosed is a method of preparing isobutene in which high-purity isobutene is separated (prepared) from a C4 mixture by cracking glycol ether prepared from a C4 mixture (in particular, C4 raffinate-1) containing isobutene and a glycol. The method includes cracking glycol ether into isobutene and glycol at a temperature between 50° C. and 300° C. in the presence of a strongly acidic catalyst. The glycol ether may be prepared by reaction between a C4 mixture containing isobutene and glycol in the presence of an acid catalyst.

Abstract: A liquid random copolymer of ethylene and alpha-olefin prepared by using specific metallocene catalyst and ionic compound and a method for preparing the same are disclosed. The liquid random copolymer has high viscosity index and shear stability so that it is useful as synthetic lubricants. The liquid random copolymer of ethylene and alpha-olefin (1) comprises 60 to 40 mol % of ethylene units and 40 to 60 mol % of alpha-olefin unit having 3 to 20 carbon atoms, (2) has number average molecular weight (Mn) of 500 to 10,000 and a molecular weight distribution (Mw/Mn, Mw is the weight average molecular weight) of 3 or less measured by Gel Permeation Chromatography (GPC) (3) has Kinematic Viscosity at 100° C. of 30 to 5,000, (4) has pour point of 30 to ?45° C., and (5) has Bromine Number of 0.1 or less.

Abstract: A metallocene catalyst composition for preparing multimodal polyolefin resin which has superior moldability, mechanical strength, appearance and so on, and a polymerization method using the same are disclosed. The catalyst composition comprises (i) at least one first metallocene compound represented by Formula 1 in the description part: (ii) at least one second metallocene compound represented by Formula 2 in the description of the Specification: and a co-catalyst.

Abstract: A non-directional smoke control damper includes a central blade (11), a plurality of outer blades (12) and a blade advancing/retreating device; an outer edge of the central blade (11) overlaps with an opening edge of the plurality of outer blades (12); a support shaft (110) is disposed to pass through the overlapping portion of the edges; a rear end of the support shaft (110) is coupled through a shaft coupling plate (230); and if the central blade (11) advances forwards, the plurality of outer blades (12) advance forwards in order so that a gap is formed at each edge between the central blade (11) and an adjacent outer blade and between a prior-order outer blade and a posterior outer blade to form a blowing passage, thereby allowing an air current to flow into the vestibule through the blowing passage.

Abstract: A method of olefin polymerization enables production of polyolefin with high productivity while suppressing sheeting or caking in the reactor. The method of olefin polymerization includes: feeding a circulating gas including at least one alpha-olefin and an inert gas into a reactor; polymerizing the alpha-olefin into a polyolefin in a reaction region in the reactor; and discharging the polyolefin from the reactor, which reactor consists of a cylindrical base section a positioned in the lower part thereof and a conical top section b positioned on the top of the cylindrical base section and having an open top. The inside of the reactor is divided into a reaction region A that is a fluidized bed region having an olefin polymerization occurring therein, and a free region B positioned on the top of the reaction region A and having solid polyolefin particles separated from the gas phase.

Abstract: A method of olefin polymerization enables production of polyolefin with high productivity while suppressing sheeting or caking in the reactor. The method of olefin polymerization includes: feeding a circulating gas including at least one alpha-olefin and an inert gas into a reactor; polymerizing the alpha-olefin into a polyolefin in a reaction region in the reactor; and discharging the polyolefin from the reactor, which reactor consists of a cylindrical base section a positioned in the lower part thereof and a conical top section b positioned on the top of the cylindrical base section and having an open top. The inside of the reactor is divided into a reaction region A that is a fluidized bed region having an olefin polymerization occurring therein, and a free region B positioned on the top of the reaction region A and having solid polyolefin particles separated from the gas phase.

Abstract: A metallocene catalyst composition for preparing multimodal polyolefin resin which has superior moldability, mechanical strength, appearance and so on, and a polymerization method using the same are disclosed. The catalyst composition comprises (i) at least one first metallocene compound represented by Formula 1 in the description part: (ii) at least one second metallocene compound represented by Formula 2 in the description of the Specification: and a co-catalyst.

Abstract: A liquid random copolymer of ethylene and alpha-olefin prepared by using specific metallocene catalyst and ionic compound and a method for preparing the same are disclosed. The liquid random copolymer has high viscosity index and shear stability so that it is useful as synthetic lubricants. The liquid random copolymer of ethylene and alpha-olefin (1) comprises 60 to 40 mol % of ethylene units and 40 to 60 mol % of alpha-olefin unit having 3 to 20 carbon atoms, (2) has number average molecular weight (Mn) of 500 to 10,000 and a molecular weight distribution (Mw/Mn, Mw is the weight average molecular weight) of 3 or less measured by Gel Permeation Chromatography (GPC) (3) has Kinematic Viscosity at 100° C. of 30 to 5,000, (4) has pour point of 30 to ?45° C., and (5) has Bromine Number of 0.1 or less.

Abstract: The present invention relates to a continuous separation and discharge apparatus and method of solid catalysts and liquid products for Fischer-Tropsch synthesis reactions, and more particularly, to a continuous separation and discharge apparatus and method of solid catalysts and products for Fischer-Tropsch synthesis reactions involving the conversion of synthetic gas into synthetic oil, by which products of the Fischer-Tropsch synthesis including wax, as a long-chain hydrocarbon, can be stably obtained by continuously separating the products from a slurry comprising solid catalyst particles and the products using periodic pulses of a feeding gas and discharging the products through a lower portion of a reactor.

Abstract: Disclosed is a method of preparing a glycol mono-tertiary-butyl ether compound using a C4 hydrocarbon mixture containing isobutene and a glycol compound as reactants, in which a glycol di-tertiary-butyl ether compound as a byproduct is decomposed into isobutene and a glycol compound and the obtained isobutene and glycol compound are recycled as reactants, whereby product yield per unit raw material may be maximized.

Abstract: A non-directional smoke control damper includes a central blade (11), a plurality of outer blades (12) and a blade advancing/retreating device; an outer edge of the central blade (11) overlaps with an opening edge of the plurality of outer blades (12); a support shaft (110) is disposed to pass through the overlapping portion of the edges; a rear end of the support shaft (110) is coupled through a shaft coupling plate (230); and if the central blade (11) advances forwards, the plurality of outer blades (12) advance forwards in order so that a gap is formed at each edge between the central blade (11) and an adjacent outer blade and between a prior-order outer blade and a posterior outer blade to form a blowing passage, thereby allowing an air current to flow into the vestibule through the blowing passage.

Abstract: The present invention relates to a process of preparing of a phosphorus-containing phosphorus-alumina support by a sol-gel method and a cobalt/phosphorus-alumina catalyst where cobalt is supported onto the phosphorus-alumina support as an active ingredient. The phosphorus-alumina support is prepared by a sol-gel method and has wide specific surface area with bimodal pore size distribution and high cobalt dispersion, thereby enabling to increase heat and mass transfer, stabilize the structure by modifying the surface property of alumina and decrease the deactivation rate due to the reduced oxidation of cobalt component during the F-T reaction. When Fischer-Tropsch reaction (F-T) is conducted on the catalyst, the catalyst maintains a superior thermal stability, inhibits the deactivation due to water generation during the F-T reaction and also causes relatively high conversion of carbon monoxide and stable selectivity of liquid hydrocarbons.

Abstract: The olefin polymerization catalyst composition comprises an organometallic compound represented by Formula 1; an organic transition metal compound represented by Formula 2; an organic transition metal compound represented by Formula 3; and an aluminoxane. (Cp?)lM1R1mR2n??Formula 1: wherein M1 is an element selected from the group of elements of Group 1, 2, 12, 13 and 14, (Cp?) is a cyclic hydrocarbyl group of 5 to 30 carbon atoms having at least 2 conjugated double bonds, R1 and R2 are independently a hydrocarbyl group of 1 to 24 carbon atoms, l is an integer of 1 to the valence of M1, m and n are independently an integer of 0 to 2, and l+m+n is equal to the valence of M1, (4HInd)2M2X2??Formula 2: M2X4??Formula 3: wherein in Formulas 2 and 3, (4HInd) is a group having tetrahydroindenyl nucleus, M2 is titanium (Ti), zirconium (Zr) or hafnium (Hf), and X is a halogen atom.

Abstract: A metallocene compound is represented by the following formula, (4HInd)(Cp?)MX2 wherein 4HInd is a group having tetrahydroindenyl nucleus, Cp? is a group having cyclopentadienyl nucleus, and 4HInd and Cp? are unsubstituted/substituted by one or more substituents of radicals from group of an alkyl, alkoxy, alkylsilyl, alkylsiloxy, alkylamino or haloalkyl group of 1 to 20 carbon atoms, a cycloalkyl group of 3 to 20 carbon atoms, an aryl, arylalkyl, arylsilyl, alkylaryl or aryloxy group of 6 to 20 carbon atoms, a dialkylamino group of 2 to 20 carbon atoms, a halogen atom, and an amino group, and M is a Group IV, V or VI transition metal, and X is radical from the group of a halogen atom, an alkyl or alkoxy group of 1 to 20 carbon atoms, an alkenyl group of 2 to 20 carbon atoms, aryl, alkylaryl, arylalkyl, aryloxy group of 6 to 20 carbon atoms.

Abstract: Disclosed is a method of preparing a glycol mono-tertiary-butyl ether compound using a C4 hydrocarbon mixture containing isobutene and a glycol compound as reactants, in which a glycol di-tertiary-butyl ether compound as a byproduct is decomposed into isobutene and a glycol compound and the obtained isobutene and glycol compound are recycled as reactants, whereby product yield per unit raw material may be maximized.

Abstract: Disclosed is a method of preparing isobutene in which high-purity isobutene is separated (prepared) from a C4 mixture by cracking glycol ether prepared from a C4 mixture (in particular, C4 raffinate-1) containing isobutene and a glycol. The method includes cracking glycol ether into isobutene and glycol at a temperature between 50° C. and 300° C. in the presence of a strongly acidic catalyst. The glycol ether may be prepared by reaction between a C4 mixture containing isobutene and glycol in the presence of an acid catalyst.

Abstract: The present invention relates to a process of preparing of a phosphorus-containing phosphorus-alumina support by a sol-gel method and a cobalt/phosphorus-alumina catalyst where cobalt is supported onto the phosphorus-alumina support as an active ingredient. The phosphorus-alumina support is prepared by a sol-gel method and has wide specific surface area with bimodal pore size distribution and high cobalt dispersion, thereby enabling to increase heat and mass transfer, stabilize the structure by modifying the surface property of alumina and decrease the deactivation rate due to the reduced oxidation of cobalt component during the F-T reaction. When Fischer-Tropsch reaction (F-T) is conducted on the catalyst, the catalyst maintains a superior thermal stability, inhibits the deactivation due to water generation during the F-T reaction and also causes relatively high conversion of carbon monoxide and stable selectivity of liquid hydrocarbons.

Abstract: The present invention relates to a method for preparing liquid hydrocarbons via a slurry phase Fischer-Tropsch (F-T) synthesis. In particular, the present invention relates to a method for preparing liquid hydrocarbons from syngas via slurry phase F-T synthesis using a catalyst, which can prevent the decrease in catalyst activity and filter clogging due to catalyst aggregation, simultaneously with improving selectivity for C5 or higher hydrocarbons by using C7-C12 alcohols having a high boiling point as an additive for a slurry reaction solvent or recycling the same alcohol separated from by-products that are generated during the F-T reaction. Since the method of the present invention is more carbon-effective and shows improved long-term stability of a reactor, it can be effectively used in the preparation of liquid hydrocarbons.

Abstract: The present invention relates to a cobalt/phosphorus-alumina catalyst in which cobalt is supported as an active component on a phosphorus-alumina support wherein phosphorus is supported on alumina surface. With a bimodal pore structure of pores of relatively different pore sizes, the catalyst provides superior heat- and matter-transfer performance and excellent catalytic reactivity. Especially, when Fischer-Tropsch (F-T) reaction is performed using the catalyst, deactivation by the water produced during the F-T reaction is inhibited and, at the same time, the dispersion and reducing property of cobalt and other active component are improved. Therefore, the cobalt/phosphorus-alumina catalyst for F-T reaction in accordance with the present invention provides good carbon monoxide conversion and stable selectivity for liquid hydrocarbons.