Alkaline pulping of lignocellulosic material with amine and nitr

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Gas – vapor or mist contact

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162 72, 162 79, 162 81, 162 90, D21C 302, D21C 304, D21C 320

Patent

active

040452808

ABSTRACT:
A method is described for increasing the yield of pulp obtained from an alkaline pulping process. A lignocellulosic material, such as wood chips, is first pretreated with an aqueous solution containing from 0.1 to 10% by weight of monoethanolamine, methylamine or dimethylamine and from 0.01 to 1% by weight of copper nitrate or nickel nitrate at elevated temperature and pressure in a closed vessel. This pretreated material is then subjected to conventional alkaline pulping, preferably soda or two-stage soda-oxygen pulping.

REFERENCES:
patent: 1163438 (1915-12-01), Muller
patent: 1860431 (1932-05-01), Richter
patent: 2192202 (1940-03-01), Peterson et al.
patent: 2218479 (1940-10-01), Peterson et al.
patent: 2511096 (1950-06-01), Bate
patent: 2668110 (1954-02-01), Spencer et al.
patent: 3691008 (1972-09-01), Worster et al.
patent: 3695994 (1972-10-01), Worster et al.
patent: 3736224 (1973-05-01), Grayson et al.
patent: 3829357 (1974-08-01), Thompson et al.
patent: 3951732 (1976-04-01), Sjostrom et al.

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