Sumitomo Chemical Company, Limited

Noriaki Oku

Masaru Ishino

Junpei Tsuji

Tateo Seo

Koji Shinohara

Toshio Nakayama

Mitsuhisa Tamura

Masaaki Katao

Kiyoshi Iwanaga

Kenshi Uchida

Hirofumi Koike

Toshikazu Omae

A method of purifying propylene oxide, which comprises subjecting the propylene oxide containing methyl formate as an impurity to extractive distillation using a hydrocarbon of 7 to 10 carbon atoms as an extractant with an extractive distillation column, adding water to the distillate from the overhead of the extractive distillation column to conduct oil-water separation, recycling the oil layer separated to the extractive distillation column, removing the aqueous layer outside the system thereby to obtain propylene oxide in which a methyl formate concentration is reduced as a bottom liquid of the extractive distillation column.

Method of purifying propylene oxide

A process for purifying propylene oxide characterized by subjecting a liquid reaction mixture containing propylene oxide, and water, hydrocarbons and oxygen-containing organic compounds as impurities obtained by reacting cumene hydroperoxide with propylene to extractive distillation using an extractant of a hydrocarbon having 7 to 20 carbon atoms with an extractive distillation column, and controlling a concentration of propylene glycol in the extractant supplied to the extractive distillation column to 20% by weight or less.

A method for chlorine purification in which crude chlorine containing nitrogen and/or oxygen is purified to separate the nitrogen and oxygen from the chloride, characterized in that the crude chlorine containing nitrogen and/or oxygen is contacted with 1,2-dichloroethane to cause the 1,2-dichloroethane to absorb the chlorine contained in the crude chlorine, and a process for producing 1,2-dichloroethane which comprises reacting ethylene with the chlorine contained in the chlorine containing 1,2-dichloroethane.

Method of chlorine purification and process for producing 1,2-dichloroethane

A process for producing cumene, characterized by preparing a copper-based catalyst by reducing a copper-based catalyst precursor containing copper in an oxidized state with hydrogen in liquid cumene, and subjecting cumyl alcohol to hydrogenolysis in the presence of the copper-based catalyst, and a process for producing propylene oxide which includes that process.

Process for producing cumene

A process for producing &agr;-phenylethyl alcohol, which comprises supplying a raw material containing acetophenone into a reactor and hydrogenating acetophenone in the presence of a hydrogenation catalyst, wherein the concentrations of organic acids and sulfur-containing acids in the raw material containing acetophenone are 1 &mgr;mol/g or less and 0.5 &mgr;mol/g or less, respectively.

Process for producing &agr;-phenylethyl alcohol

A process is described for purifying propylene oxide, which includes the step of distilling propylene oxide containing impurities in the presence of a hydrocarbon having 5 carbon atoms or less. According to the present invention, a process is provided for purifying propylene oxide which has a feature that impurities contained in a solution containing propylene oxide to be purified can be efficiently removed. Oxygen-containing impurities, in particular, can be very efficiently removed.

Process for purifying propylene oxide

Process for producing oxirane compound

Process for producing propylene oxide

A reduction-treated copper-based catalyst obtained by reducing a copper-based catalyst with hydrogen in the presence of a liquid phase and a process for producing &agr;-phenylethyl alcohol, which comprises hydrogenating acetophenone in the presence of the same.

Reduction-treated copper-based catalyst and process for producing &agr;-phenylethyl alcohol using the same

A process for producing .alpha.-phenylethyl alcohol, which comprises hydrogenating acetophenone by a fixed bed flow reaction in the presence of a catalyst, wherein the reaction is conducted in the state where the liquid hold up ratio in a reactor is in the range of from 30% to 90%.

Process for producing .alpha.-phenylethyl alcohol

A process for producing propylene oxide which comprises reacting a raw material solution which is a solution of ethylbenzene hydroperoxide in ethylbenzene obtained by liquid phase autoxidation of ethylbenzene with propylene in the presence of a Ti-containing solid catalyst to give propylene oxide, said raw material solution being a solution prepared by washing a solution of ethylbenzene hydroperoxide in ethylbenzene obtained by liquid phase autoxidation of ethylbenzene with an aqueous alkali solution to bring a lactic acid concentration to 5 ppm by weight or less.

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Ichihara, Japan

Noriaki Oku