Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Chemical treatment after start or completion of mechanical...
Patent
1974-06-28
1976-04-20
Lindsay, Jr., Robert L.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Chemical treatment after start or completion of mechanical...
162 67, 162 89, D21B 116, D21C 318
Patent
active
RE0287776
ABSTRACT:
[A process for the delignification of chips of vegetable matter by pretreating the chips to obtain at least 64 percent by weight refined vegetable matter, and delignifying the refine vegetable matter with chlorine dioxide. A pulp produced in high yield by the process which refines easier, dries more readily on a paper machine, exhibits higher on-machine filler retention, and possesses greater strength than conventionally bleached kraft pulp made from the same wood mixture. A paper produced from said pulp which has higher tensile, tear, burst, fold, pick and delamination strengths and greater brightness stability that paper produced from conventionally bleached kraft pulp made from the same wood mixture.] A process of delignifying lignocellulosic vegetable matter wherein the vegetable matter is pretreated to obtain a refined vegetable matter which is thereafter delignified by reacting it in at least two stages with chlorine dioxide, each successive stage using less chlorine dioxide than the preceding stage and the total chlorine dioxide used being from about 1% to about 15% based upon the dry weight of the vegetable matter, and wherein the vegetable matter is extracted between successive chlorine dioxide stages with a caustic material, pulp produced from said process and paper prepared from said pulp.
REFERENCES:
patent: 2882965 (1959-04-01), Wayman et al.
patent: 3020197 (1962-02-01), Schuber
patent: 3433702 (1969-03-01), Jack et al.
patent: 3501374 (1970-03-01), Jack et al.
patent: 3829357 (1974-08-01), Thompson
Casey, Pulp & Papers, 2nd ed., vol. I, 1960, p. 102.
Levitin and Schwartz, "Delignification of Spruce Sawdust with Chlorine Dioxide" in Pulp and Paper Magazine of Canada, vol. 55 (Jan. 1954) pp. 92-98.
Corbin Arthur L.
Ethyl Corporation
Johnson Donald L.
Lindsay, Jr. Robert L.
Ray David L.
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