Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical
Patent
1992-08-11
1994-11-22
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Treatment with particular chemical
162 76, 162 78, 162 82, D21C 320, D21C 916
Patent
active
053665937
ABSTRACT:
A chemical pulp which contains reactants capable of generating dioxirane within the pulp is produced in a process which comprises mixing a pulp with reactants comprising a carbonyl compound, preferably acetone, and an oxygen donor, preferably monoperoxysulfate, in proportions which produce a water-soluble dioxirane having a molecular diameter of less than 140 angstrom units. Such a pulp bleaching process which employs dioxirane as a bleaching agent is rendered environmentally and economically acceptable by recycling the reactants employed to produce the dioxirane.
REFERENCES:
patent: 3822114 (1974-07-01), Montgomery
patent: 4404061 (1983-09-01), Cael
Adam et al., "Dioxirane Epoxidation of alpha, beta-Unsaturated Ketones", Chem. Ber. 124 (1991), 227-232.
Edwards et al., "On the Formation and Reactivity of Dioxirane Intermediates in the Reaction of Peroxoanions with Organic Substrates," Photochem. and Photobiol., vol. 10, pp. 63-70 (1979).
Zabrowski et al., "The Oxidation of Aromatic Amines in the Presence of `Electron-Rich` Aromatic Systems," Tetrahedron Letters, vol. 29, No. 36, pp. 4501-4504 (1988).
SINGH, "The Bleaching of Pulp", Tappi Press, Atlanta, Ga. 1979, pp. 305-314.
Montgomery, "Catalysis of Peroxymonosulfate Reactions by Ketones," J. Amer. Soc., vol. 96, No. 25, pp. 7820, 7821 (1974).
Murray et al., "Dioxiranes: Synthesis and Reactions of Methyldioxiranes," J. Org. Chem. 1985, 50, 1847-2853.
Chen Jianxin
Hogikyan Robert M.
Hunt Kenneth
Lee Chung-Li
Murray Robert W.
Alvo Steve
Pulp & Paper Research Institute of Canada
The Curators of the University of Missouri
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