Process for fractional crystallization of substances, a crystallizer suitable for working the process, and use of the process
US6145340A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1998 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Jul 16, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D9/0072
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In the process according to the invention for fractionating substances, particularly paraffins, oils, fats and waxes, which, when crystallized, have poor adhesion to the substantially vertical crystallization surfaces (39) of a crystallizer, screen-like supporting structures, e.g. perforated metal sheets (31) bent in a zig-zag, are disposed between the crystallization surfaces (39) of a crystallizer. The crystals (51) becoming detached from the crystallization surfaces (39) during the sweating phase are left suspended in horizontal strips in the triangular zones (41) on the perforated sheet (31) and remain in thermal contact with the crystallization surface (39) and sweat out the liquid phase (55). The mother liquor (55) drips off, in some cases also between the crystals (51) and the crystallization surface (39), with the result that drip channels are melted by the heated mother liquor and thus opened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.