Sumitomo Chemical Company, Limited

Shinohara, Koji

Koji Shinohara

Toshio Nakayama

Junpei Tsuji

Noriaki Oku

Shigeru Goto

Masaaki Katao

Masayuki Yoshii

Kenji Itoh

Shinjiro Ishihara

There is provided a method for producing dipropylene glycol (DPG) and/or tripropylene glycol (TPG) including: (A) reacting a raw material liquid including propylene oxide and water to obtain a reaction liquid including unreacted water, propylene glycol (PG), DPG and/or TPG, and an alcohol compound excluding PG, DPG, and TPG; (B) separating, from the reaction liquid, a first liquid containing water and the alcohol compound and a second liquid containing the PG, DPG and/or TPG and optionally the alcohol compound; (C) removing a part of the alcohol compound from the first liquid to obtain a third liquid containing water and optionally a part of the alcohol compound; (D) separating, from the second liquid, a fourth liquid containing the PG and optionally the alcohol compound, and a fifth liquid containing the DPG and/or TPG and optionally the alcohol compound; and (E) recycling a part of the third liquid to step (A).

Method for producing glycols from oxirane compound

A process for producing propylene oxide, which comprises supplying an organic peroxide and propylene to an epoxidation reactor in which a solid catalyst is packed thereby continuously producing propylene oxide through epoxidation reaction, wherein said process comprises cooling at least a part of the propylene before supplying to separate and remove water contained in the propylene, and supplying the propylene in which water has been separated and removed to the epoxidation reactor.

Process for producing propylene oxide

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, which comprises washing propylene oxide containing aldehydes and subsequently contacting an aqueous phase obtained with an extractant.

Process for 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 process for producing purified propylene oxide comprising:

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Ichihara, Japan

Koji Shinohara