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:
Jun. 20, 2006
Filed:
Aug. 11, 2004
Kazuki Naito, Wakayama, JP;
Koji Mine, Wakayama, JP;
Kazuki Naito, Wakayama, JP;
Koji Mine, Wakayama, JP;
Kao Corporation, Tokyo, JP;
Abstract
This invention provides a process for producing a pyran efficiently with high productivity and simplified production facilities. The process for producing a pyran comprises reacting aldehyde (I) represented by:R—CHO  (I) whereinis a single or double bond and Rrepresents an alkyl or alkenyl group having 1 to 12 carbon atoms, an optionally alkyl- or alkoxy-substituted aryl group having 6 to 12 carbon atoms in total, etc., to react isoprenol to produce pyran (II), wherein water in a reactor is maintained in an amount of 0.25 wt % or less while the conversion of that which has the lower charged total number of moles between aldehyde (I) and isoprenol is less than 50%.