Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical
Patent
1981-04-13
1984-01-24
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Treatment with particular chemical
162 79, 2521861, 25218628, 25218633, D21C 916
Patent
active
044274904
ABSTRACT:
A process and solution for delignifying and brightening lignocellulosic pulp. The solution comprises from about 0.1 to about 5% by weight, based on oven-dried pulp of a peroxide and about 0.5 to about 20 mole percent, based on the moles of peroxide, of a metal ion selected from the group consisting of tungsten, molybdenum, chromium, osmium and selenium. The preferred process of this invention comprises contacting a lignocellulosic pulp with about 0.5 to about 20 mole percent, based on moles of peroxide, of a metal ion selected from the group consisting of tungsten, molybdenum, chromium, osmium and selenium at a temperature below about 50.degree. C.; adjusting the pH of the resultant pulp slurry to between about 1 and about 7; adding 0.1 to about 5% by weight based on oven-dried pulp of peroxide and effecting pulp delignification and brightening at about 30.degree. C. to about 100.degree. C. until most of the peroxide has been consumed.
REFERENCES:
patent: 1213921 (1917-01-01), Liebknecht et al.
patent: 1758920 (1930-05-01), Baum
patent: 1958204 (1934-05-01), Reichert
patent: 2004809 (1935-06-01), Gilbert et al.
patent: 2081327 (1937-05-01), Franz
patent: 2112116 (1938-03-01), Richter
patent: 2119519 (1938-06-01), Bragg
patent: 2173474 (1939-09-01), Evoy
patent: 2187016 (1940-01-01), Craig
patent: 2249646 (1941-07-01), Brugg
patent: 2368527 (1945-01-01), Edelstein
patent: 2975169 (1961-03-01), Crunford et al.
patent: 3156654 (1964-11-01), Konecny
patent: 3193445 (1965-07-01), Parker
patent: 3462344 (1969-08-01), Kindron et al.
patent: 3806404 (1974-04-01), Leibergott et al.
Wallace "Hydrogen Peroxide In Organic Chemistry", pp. 60-69.
Holladay et al., "The Bleaching of Pulp" Chapt. 9, 180-185, Mack Printing Co. 1963.
McCloskey et al.; "Catalytic Influence of Iron and Magnesium Ions in O.sub.2 Bleaching Reactions" TAPPI; vol. 58, No. 2 2-1975.
Christensen; "Bleaching of Sulphate Pulps with Hydrogen Peroxide", Norsk Skogindustri, pp. 268-271.
Rapson; "The Role of pH in Bleaching Pulp", TAPPI pp. 284-294, vol. 39, No. 5.
Schurb et al.; Hydrogen Peroxide, pp. 658-661.
Alvo Steve
Haley, Jr. James F.
International Paper Company
Shaw Robert M.
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