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:
Sep. 17, 1996
Filed:
Mar. 27, 1995
Applicant:
Inventors:
Hiroshi Koyama, Hiroshima, JP;
Etsuo Takemoto, Hiroshima, JP;
Assignee:
Daicel Chemical Industries, Ltd., Osaka-fu, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
203 91 ; 159 49 ; 159D / ; 202158 ; 203 89 ; 203 99 ; 564507 ;
Abstract
1-aminopropanediol-2,3 containing 2-aminopropanediol-1,3 of less than 0.30% by weight can be prepared by the present purification process, which involves distilling a 1-aminopropanediol-2,3 containing at least 0.3% of 2-aminopropanediol-1,3 based on the weight of 1-aminopropanediol-2,3 using a distillation column, said distillation column having low pressure loss.