Process for preparing pentane-1,5-diol
US6265624A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2000 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Apr 19, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C29/149
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is described for the continuous recovery of substantially pure pentane-1,5-diol from a crude product stream (1) containing pentane-1,5-diol and .delta.-valerolactone. The feed stream (1) is continuously supplied to a vaporization zone (2) 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 .delta.-valerolactone thereby to form a vaporous stream. The resulting vaporous stream is continuously supplied to an intermediate section of a distillation zone (4). A reflux stream (5) of dimethyl glutarate is fed to an upper section of the distillation zone (4) and an overhead vapor product stream (8) comprising .delta.-valerolactone and dimethyl glutarate is taken. Also an intermediate stream (11) comprising substantially pure pentane-1,5-diol is taken from the distillation zone (4), while from the bottom section of the distillation zone there is recovered a bottoms product (12).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.