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:
Jul. 24, 2001
Filed:
Apr. 19, 2000
John Scarlett, Kirk Merrington, GB;
Michael Anthony Wood, Yarm, GB;
Paul Willett, Witton le Wear, GB;
Kvaerner Process Technology, Ltd., London, GB;
Abstract
A process is described for the continuous recovery of substantially pure pentane-1,5-diol from a crude product stream (,) containing pentane-1,5-diol and &dgr;-valerolactone. The feed stream (,) is continuously supplied to a vaporization zone (,) maintained under temperature and pressure conditions effective for the vaporization of pentane-1,5-diol and conducive to the thermal decomposition of reaction products of &dgr;-valerolactone thereby to form a vaporous stream. The resulting vaporous stream is continuously supplied to an intermediate section of a distillation zone (,). A reflux stream (,) of dimethyl glutarate is fed to an upper section of the distillation zone (,) and an overhead vapor product stream (,) comprising &dgr;-valerolactone and dimethyl glutarate is taken. Also an intermediate stream (,) comprising substantially pure pentane-1,5-diol is taken from the distillation zone (,), while from the bottom section of the distillation zone there is recovered a bottoms product (,).