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. 06, 1981
Filed:
Nov. 08, 1977
Applicant:
Inventors:
Toshio Yamamura, Yokohama, JP;
Yoshiro Osawa, Yokohama, JP;
Isao Ouchi, Yokohama, JP;
Nobuteru Oda, Yokohama, JP;
Mitsuyoshi Yamazaki, Yokohama, JP;
Yukio Nishiyama, Yokohama, JP;
Assignee:
Showa Denko K.K., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; C07D / ;
U.S. Cl.
CPC ...
203-8 ; 203 50 ; 26034837 ;
Abstract
A crude olefin oxide containing high-boiling ingredients is distilled at a pH of 4 to 7 in the presence of a nonvolatile neutral or weakly basic alkali metal or alkaline earth metal salt or hydroxide to separate the olefin oxide from the high-boiling ingredients. This permits the prevention of the polymerization of the olefin oxide and its conversion to the corresponding glycol.