Sumitomo Chemical Company, Limited

Shimizu Construction Co., Ltd.

Shigeru Goto

Masaaki Katao

Koji Shinohara

Kenji Itoh

Tomoyuki Noritake

Toru Kawai

Jun Yamamoto

Masayuki Yoshii

Shigenori Shiraishi

Shinjiro Ishihara

Mayumi Nishimura

Atsuo Onoue

Katsuyuki Tamaoki

Sumio Horiuchi

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 method for producing propylene oxide in which the concentration of an organic peroxide in a reaction solution after an epoxidation step is from 20 to 5,000 ppm by weight based on the amount excluding propylene in the reaction solution, the method comprising an epoxidation step of reacting an organic peroxide with propylene in the presence of a catalyst to obtain propylene oxide and an alcohol, a propylene recovery step of recovering the unreacted propylene in the epoxidation step and recycling the resulting propylene as a raw material of the epoxidation step, and a propylene oxide purification step of distilling the propylene oxide obtained in the epoxidation step to obtain purified propylene oxide.

Method for producing propylene oxide

A purification method of dihydroxybenzene comprising the following steps, for obtaining purified dihydroxybenzene from crude dihydroxybenzene containing at least isopropenylphenol and hydroxyacetophenone as impurities: first extraction step, distillation step, second extraction step, and recovery step.

Purification method of dihydroxybenzene

A method for collecting an object material from a solution, which comprises the following steps:

Method for collecting object material from solution

A process for producing purified propylene oxide comprising:

Process for preparing extract containing at least one hydroperoxide

A method and apparatus for producing a slurry for underwater placement. The slurry is prepared by a mixer and the mixed slurry is then agitated by an agitator. Before underwater placement of the slurry, bubbles in the slurry is reduced. The apparatus includes a supplying device for supplying a hydraulic material and water in a predetermined ratio; a mixing device for mixing the hydraulic material and the water supplied from the supplying device to produce a slurry; an agitating device for receiving the slurry from the mixing device and for agitating the slurry; and a deaerating device for receiving the agitated slurry from the agitating device and for deaerating the agitated slurry.

Growing community of inventors

Chiba, Japan

Shigeru Goto