Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1981-09-21
1983-08-09
Smith, William F.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 40, 162 63, 162 72, 162 77, D21C 320
Patent
active
043977120
ABSTRACT:
A process for producing corrugating medium pulp, fuel, and other products from a wide variety of woody materials is disclosed. In one embodiment a pulping solution is produced by cooking green chips in a water solution of monoethanolamine and subsequently collecting the liquor produced. Pulp is then produced by digesting chips under a vapor dome of the pulping solution, or cooking the chips in the solution and subsequently digesting under a vapor dome. Digested chips are then refined in pulping solution to produce corrugated medium pulp. In another embodiment, fuel may be produced by digesting woody material under a vapor dome with sulfur dioxide and ammonia. The digested chips then yield a lignin containing liquor which has a good fuel value and may be used as a liquid fuel or impregnate for woody material. In another embodiment the pulping solution is used as a hard wood conversion resin. Wood is impregnated and pressed. The pressed wood may have a density of twice the original wood. Monoethanolamine vapor also can convert soft wood to hard wood. When wood is vapor impregnated under a vapor dome it may be pressed to a more dense configuration. In both hard wood embodiments the pressed wood maintains its pressed configuration so that it may be used in construction or as a fuel.
REFERENCES:
patent: 1574026 (1926-02-01), Fish, Jr.
patent: 1594389 (1926-08-01), Thellier
patent: 2192202 (1940-03-01), Peterson et al.
patent: 3308011 (1967-03-01), Ross
patent: 3619348 (1971-11-01), Asplund et al.
patent: 4073678 (1978-02-01), Hammond et al.
New Fibers International
Smith William F.
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