Method and filtration apparatus for purifying solvents
US4889642A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1988 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Aug 4, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D29/84
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and filtration apparatus for purifying solvents. Impurities present in the solvent are separated out in the filtration apparatus via filtration using at least one filter, through which the solvent flows and upon which the impurities settle as a filter cake. At least prior to the removal of the impurities that form the filter cake from the filtration apparatus, solvent residues present in the filter cake and possibly also in the filter are recovered by evaporation. The solvent residues in the filtration apparatus are vaporized by the action of a hot, gaseous medium that is conveyed first through the filter and only then through the filter cake, i.e. the impurities, in the direction opposite to the direction in which the solvent flowed through the filtration apparatus during the filtration process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.