Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1978-10-12
1979-07-03
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
423183, 423164, 423265, 423641, 423DIG3, D21C 1104
Patent
active
041599225
ABSTRACT:
In the alkaline pulping of cellulose and particularly in the step wherein green liquor is converted to white liquor by causticizing or the addition of calcium hydroxide, it has been found that the addition of any of three specially selected organic phosphonate reagents, namely, nitrilotris(methylenephosphonic acid) (Dequest 2000); 2-phosphonobutane-1,2,4-tricarboxylic acid (Bayer PBS-AM); and hexamethylenediaminetetrakis(methylenephosphonic acid) (Nalco 7691/Dequest 2051), accelerates the speed of the reaction to the right. These acid compounds and their soluble alkali metal and ammonium salts have proved effective in increasing the acceleration rate to the right of the causticizing reaction and the production of the titratable sodium hydroxide
REFERENCES:
patent: 3269941 (1966-08-01), Le Compte et al.
patent: 3832396 (1974-08-01), Irani et al.
patent: 3959168 (1976-05-01), Germscheid et al.
patent: 4018877 (1977-04-01), Woode
Bashore S. Leon
Miller Robert A.
Nalco Chemical Company
Premo John G.
Roberts, Jr. John S.
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