Method for separating compounds in process streams
US5440058A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1994 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Jun 7, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62D2101/40
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method, especially applicable on a continuous basis to commercial process streams, for treating unwanted by-products and/or impurities contained in those streams. The method comprises the reaction in situ of such by-products or impurities with a reagent, preferably selected for its reactivity under ambient conditions of the process stream, to produce one or more materials which may then be separated from the process by economical means. The treated stream may be recycled to the process for further processing. While the method is not limited as to the process to which it is applied nor to the reagent or reagents used, in one convenient embodiment, formaldehyde in aqueous solution is reacted with an alkali metal sulfite or bisulfite to produce the corresponding salt, which may then be separated essentially completely by, e.g., distillation or membrane separation, etc., or its concentration in the process may be controlled by, e.g., continuous removal of a purge stream, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.