The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 2016
Filed:
May. 10, 2013
Sumitomo Chemical Company Limited, Tokyo, JP;
Shigeru Goto, Tokyo, JP;
Kenji Itoh, Chiba, JP;
Koji Shinohara, Chiba, JP;
Masayuki Yoshii, Chiba, JP;
Shinjiro Ishihara, Ehime, JP;
Sumitomo Chemical Company, Limited, Tokyo, JP;
Abstract
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).