Device for crystallization by isentropic expansion and its use
US6162262A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1998 |
| Grant date | Dec 19, 2000 |
| Priority date | — |
| Expiry date | Jun 16, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C7/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Device and process for crystallizing a component, e.g. paraxylene, from a mixture that comprises a chamber (1) that has in its upper part means (46) for supplying the mixture, collecting means (20), and in its lower part, crystals of the component in suspension in a mother liquor, connected to means (C) for separation and purification of the crystals that are obtained, means (9) for supplying a cold gaseous fluid and means (22) for drawing off the so-called hot gaseous fluid that results from the direct heat exchange, whereby said device also comprises means for shaping a descending flow of the mixture onto tubes such that the cold gaseous fluid that circulates upward exchanges cold directly with the mixture, whereby means (22) for drawing off the hot gaseous fluid are connected to at least one fluid recompression means (24b), whose output is connected to at least one heat exchanger (27), whereby the heat exchanger is connected to a turbo-expander (30), which is connected to means (31) for supplying cold gaseous fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.