Method for control of chemicals during gas treatment of suspensions
US4419184A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 20, 1981 |
| Grant date | Dec 6, 1983 |
| Priority date | — |
| Expiry date | Jul 20, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/343
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of treating medium consistency paper pulp or the like with a treament gas, such as oxygen, is provided to achieve uniform treatment results. The treatment gas is added to the pulp in finely distributed small bubbles, and the density of the suspension is measured at at least one moment, or the average density is measured during at least one time period. The temperature and the pressure of the suspension corresponding to the density measurements are determined, and the rest gas content of the substance is calculated at the actual moments or time periods based upon the measurements in the preceding steps. The gas consumption is then calculated as the difference between the quantity of gas added, and the residual gas quantity, or between two residual gas quantities. The gas addition step is controlled based upon the calculated consumption to obtain substantially uniform treatment results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.