Paper making and fiber liberation – Apparatus – Digester
Patent
1992-04-17
1995-01-17
Alvo, Steve
Paper making and fiber liberation
Apparatus
Digester
162 65, 162263, 162243, 422 62, 422110, 422111, 366132, D21C 9153, D21C 712
Patent
active
053823265
ABSTRACT:
Laboratory equipment for practicing experiments and mixing ozone with medium consistency cellulosic pulp allows precise control of the timing and amount of ozone injected into the mixer, providing a method of testing that is more accurate than prior methods. An injection cylinder and fluidizing laboratory mixer are utilized. Pulp is fed into the mixer, the cylinder is charged with a known predetermined amount of ozone containing gas, the ozone containing gas is injected from the cylinder into the mixer, the mixer is operated to effect mixing of the ozone containing gas with the pulp for a predetermined period of time, and then gas containing residual ozone (which has not reacted with the pulp) from the mixer is vented from the mixer, including by utilizing a purge gas such as nitrogen. The ozone is created by an ozone generator which continuously operates. A three-way valve directs the output of the ozone generator to an ozone destruction device when the ozone is not being charged into the cylinder. A residual ozone analyzer is disposed in the vent of the mixer between it and the ozone destruct system, and may comprise a pair of potassium iodide solution containing vessels. Automatic valves and controls are provided for completely automating the testing sequence.
REFERENCES:
patent: 4662991 (1987-05-01), Karna et al.
patent: 4854713 (1989-08-01), Soechtig
Laxen et al, Paper and Timber at 72 (1990):5, "Medium Consistency Ozone Bleaching".
Greenwood, Szopinski, "Ozone Bleaching Technology '92" Paper presented at Non-Chlorine Bleaching Conference, Mar. 2-5, 1992.
Fragassi Vincent
Szopinski Ryszard
Alvo Steve
Kamyr Inc.
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