Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Patent
1989-01-19
1990-08-07
Lacey, David L.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With testing, sampling or analyzing
162 63, 162 65, 162236, 162DIG10, 162DIG11, 73 2503, B21C 9147
Patent
active
049465554
ABSTRACT:
An inert gas such as helium is employed as a tracer gas in a pulp and paper mill to determine the utilization of oxygen by an aqueous cellulosic pulp particularly, as well as other parameters, in an oxygen delignification or extraction in which oxygen is dissolved in the pulp and reacted to solubilize lignins and reduce the requirement for chlorine-based bleaching chemicals.
REFERENCES:
patent: 4016029 (1977-04-01), Samuelson
patent: 4050981 (1977-09-01), Jamieson
patent: 4192708 (1980-03-01), Bergstrom
patent: 4198266 (1980-04-01), Kirk
patent: 4384959 (1983-05-01), Bauer
patent: 4419184 (1983-12-01), Backlund
patent: 4717672 (1988-01-01), Fleming
patent: 4840703 (1989-06-01), Malmsten
"Optimizating oxygen extraction by vent gas analysis: process control and safety" by Cirucci, TAPPI Journal, Jul. 1986, pp. 94-97.
"Experience for hydrostatic medium-consistency oxygen delignification of Rauma Pulp Mill" by Kovasin and Malmsten, Pulp & Paper Canada, 88:8(1987), pp. 36-39.
Dieguez Jose
Hornsey Derek
Lee Robert G. H.
Perkins Arthur S.
Canadian Liquid Air Ltd./Air Liquide Canada
Lacey David L.
Lithgow Thomas M.
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