Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1983-04-06
1985-01-29
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 29, 162 72, 162 77, 162 90, D21C 302, D21C 320
Patent
active
044964269
ABSTRACT:
This invention relates generally to the extraction process and provides a novel process and reactor for the continuous extraction of vegetable-fibre material such as wood chips. The process comprises a two stage process, the first stage comprising an extraction process using a methanol:water mixture and the second stage using the same extraction liquid as the first with a greater proportion of water, with sodium hydroxide and anthraquinone. A part of the extraction liquid which is saturated by extraction substances is continually carried away at each stage and after extraction, the mixture is subjected to washing. This process has eliminated the heavy pollution produced by the prior art processes and also has reduced the cost and complexity of the prior art processes.
REFERENCES:
patent: 2166540 (1939-07-01), Bailey
patent: 4012280 (1977-03-01), Holton
Green et al., "Alkaline Pulping In Aqueous Alcohols and Amines", Tappi, May 1982, vol. 65, No. 5, pp. 133-137.
Baumeister Manfred
Edel Eugen
Alvo Steve
MD-Verwaltungesellschaft Nicolaus GmbH & Co. KG
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