Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1977-05-12
1979-07-24
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 30R, 252188, 423642, 162 31, D21C 1104
Patent
active
041621875
ABSTRACT:
Sodium sulfide or sodium hydrosulfide is oxidized to form sodium polysulfide and sodium hydroxide which may be further oxidized to sodium thiosulfate and sodium hydroxide. The oxidant is air, oxygen or oxygen in mixture with other gases, the reductant is aqueous sodium sulfide or sodium hydrosulfide and the reaction is carried out with both reactants in non-flooded contact with a solid catalyst material, of which a typical example is a particulate carbon treated with polytetrafluoroethylene (PTFE). The reaction is typically conducted at atmospheric pressure and without the application of heat, with the oxidant and the reductant being in interfacial contact with each other, but only, insofar as possible, at sites where both are simultaneously in contact with a catalyst which is prevented from being flooded by either the oxidant or reductant.
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"Some Ideas on Polysulfide Pulping", Venemark, Svensk Papperstidning, vol. 67, pp. 157-166 (1964).
Sanders Frederick W.
Smith Glen C.
Bashore S. Leon
Kratz Peter F.
The Mead Corporation
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