Process for the rectification of mixtures of high-boiling air-and/or temperature-sensitive useful products
US7858813B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2005 |
| Grant date | Dec 28, 2010 |
| Priority date | — |
| Expiry date | Jul 11, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/72
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
According to the invention, a process for the rectification of mixtures of high-boiling air- and/or temperature-sensitive substances which require a high separation efficiency is proposed, in particular a process for the working-up of a VE- or VEA-containing product stream. The process is characterized in particular in that, in a first purification stage, low-boiling products and unspecified isomers of the useful product are separated from the product stream virtually without loss of useful product and that, in a second purification stage, the useful product is removed in a stream having a purity of >97% by weight and a further stream having a purity of >92% by weight. A preferred embodiment of the process serves for working up VEA, in which the loss of useful product in the first purification stage is less than 5%, based on that amount of VEA in the feed which is added to the purification stage per unit time. Furthermore, the first purification stage may comprise a rectification column (1), from the top (Ia) of which the low-boiling products and the unspecified isomers of VEA are taken off, a stream containing the useful product in purified form being taken off at the side (15) an…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.