Daelim Industrial Co., Ltd.

Dl Chemical Co., Ltd.

Jin Hun Ju

Jae Hoon Uhm

Sah Mun Hong

Hee Sun Bae

Joo Mi Yeo

Hyeung Jin Lee

The present invention relates to a lubricant composition, and more particularly to a lubricant composition, which has superior oxidation stability and friction characteristics even under harsh conditions of high temperature and high pressure and is thus suitable for use in hydraulic oil. The lubricant composition of the present invention includes a base oil, a liquid olefin copolymer, a phosphorothioate compound, and phosphonium phosphate.

Lubricant composition for hydraulic oil

Disclosed is a method for polymerization that copolymerizes ethylene and alpha-olefin. The method includes the steps of: copolymerizing ethylene and alpha-olefin of reaction raw materials in presence of solvents, to produce a polymerization product in which low molecular weight compounds containing unreacted ethylene and alpha-olefin, the solvents, ethylene and alpha-olefin copolymers and ethylene and alpha-olefin oligomers; separating the unreacted ethylene and alpha-olefin contained in the polymerization product by distilling; separating the solvents and the low molecular weight compounds having lower molecular weight than the ethylene and alpha-olefin copolymer and contained in the polymerization product by distilling, to obtain pure polymerization product; and separating the low molecular weight oligomers from the solvents and the low molecular weight compounds previously separated by distilling to recover the solvents, and then reusing the recovered solvents as solvents for polymerization.

Ethylene and alpha-olefin polymerization method

An apparatus and method for economically copolymerizing ethylene and alpha-olefin by reusing reacting raw materials and solvents, comprising: a polymerization reactor where ethylene and alpha-olefin are supplied as reaction raw materials with a solvent, and the reaction raw materials are copolymerized in a solution state to produce a polymerization product comprising a dissolved ethylene and alpha-olefin copolymer; a unit for separating unreacted ethylene, alpha-olefin, low molecular weight oligomer and a polymer, including a flash tower for distilling and separating the unreacted ethylene and alpha-olefin from the polymerization product, and a stripper unit for distilling and separating the solvent and the low molecular weight oligomer having a molecular weight lower than the molecular weight of the ethylene and alpha-olefin copolymer in the polymerization product; and a solvent recovery unit for separating the low molecular weight oligomer from the separated low molecular weight oligomer and solvent to recover the solvent.

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Daejeon, South Korea

Jin Hun Ju