Process for reducing carbohydrate losses in the sulfate pulping

Details Process for reducing carbohydrate losses in the sulfate pulping Process for reducing carbohydrate losses in the sulfate pulping

1982-10-26

1988-06-14

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 81, 162 82, D21C 302, D21C 316

Patent

active

047509732

ABSTRACT:
A process is provided for reducing carbohydrate losses in the sulphate pulping of wood using sodium hydroxide and sodium sulfide, by pretreating the wood in the presence of water with oxygen gas and nitrogen oxide such as NO.sub.2 and/or NO and/or polymeric oxides and double molecules thereof, for example, N.sub.2 O.sub.4 or N.sub.2 O.sub.3, for from about 3 to about 110 minutes at a temperature within the range from about 25.degree. to about 100.degree. C., the amount of nitrogen oxide charged, calculated as monomers, being within the range from about 0.05 to about 1 kilomole per 1000 kg bone-dry wood, resulting in one or several of the following advantages: an improved yield of pulp, an improved viscosity, and a reduced requirement for bleaching chemicals in any subsequent bleaching stages.

REFERENCES:
patent: 2110546 (1938-03-01), Dreyfus
patent: 2733992 (1956-02-01), Reyerson
patent: 4076579 (1970-02-01), Brink

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