Method of and an apparatus for controlling the quantity of filter aid fed to a sedimentation filter in a given unit of time during filtration
US4118778A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1977 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Jul 13, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D37/046
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of and an apparatus for controlling the quantity of filter aid fed to a settling filter in a given unit of time during filtration. The pressure drop across the filter is determined and used to provide a first control magnitude, the quantity of liquid flowing through the filter per unit of time is determined and used to give a second magnitude, and the ratio of the first to the second magnitudes is determined as a third control magnitude, the quantity of filter aid delivered to the liquid feed to the filter is adjusted in proportion to such third control magnitude. Various ways of relating each control magnitude to its control variable are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.