Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Patent
1981-07-20
1983-12-06
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With testing, sampling or analyzing
162 62, 162 65, 422111, D21C 712
Patent
active
044191847
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.
REFERENCES:
patent: 3745065 (1973-07-01), Nilo Rama
patent: 3832276 (1974-08-01), Roymoulik et al.
patent: 3951733 (1976-04-01), Phillips
patent: 4093511 (1978-06-01), Richter
patent: 4220498 (1980-09-01), Prough
patent: 4239590 (1980-12-01), Prough
patent: 4259150 (1981-03-01), Prough
Oxygen/Alkali Delignification at Kamyr Digester Blowline Consistency--A Status Report by: P. J. Kleppe, A. Backlund, and Y. Schildt (vol. 59, No. 11, Nov. 1976).
Burnett, "Computer Control of the Chlorine Stage" Pulp and Paper Magazine of Canada, vol. 71, No. 14, Jul. 17, 1970.
McGill, "Measurement and Control in Papermaking", Adam Hilger Ltd., Bristol 1980.
Alvo Steve
Kamyr AB
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