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:
Aug. 08, 2006
Filed:
Jun. 06, 2001
Teruyuki Ninomiya, Okayama-ken, JP;
Toshio Watanabe, Okayama-ken, JP;
Atsushi Iwamoto, Okayama-ken, JP;
Soemu Miyashita, Okayama-ken, JP;
Masafumi Watanabe, Okayama-ken, JP;
Teruyuki Ninomiya, Okayama-ken, JP;
Toshio Watanabe, Okayama-ken, JP;
Atsushi Iwamoto, Okayama-ken, JP;
Soemu Miyashita, Okayama-ken, JP;
Masafumi Watanabe, Okayama-ken, JP;
Mitsubishi Gas Chemical Company, INC, Tokyo, JP;
Abstract
A process for producing a polyol by reacting an aliphatic aldehyde with formaldehyde in the presence of a basic catalyst, which comprises a step of concentration which comprises removing water and unreacted formaldehyde from a reaction liquid by distillation; a step of extraction which comprises extracting the polyol from a concentrated reaction liquid with an extracting reagent; a step of washing with water which comprises washing an extract liquid with water and separating the liquid into an oil layer containing the polyol and an aqueous layer; wherein by useing an specific aliphatic aldehyde as the extracting agent and recovering the extracting reagent from the oil layer containing the polyol after adjusting pH of the oil layer, a high purity polyhydric alcohol can be obtained at a high yield with suppressed formation of byproducts such as acetal compounds and aldol compounds.