Paper making and fiber liberation – Apparatus – Digester
Patent
1989-09-05
1992-05-19
Fisher, Richard V.
Paper making and fiber liberation
Apparatus
Digester
162249, 162250, 162233, 422285, 422289, 422290, 422307, D21C 710, D21C 714
Patent
active
051145405
ABSTRACT:
An apparatus for chemical treatment of lignocellulosic materials comprises two concentric compartments, the inner one is used for chemical reaction whereas the outer is used for generation of hot water or steam. The top and the bottom of the outer compartment is closed and connected to the inner one. These two are interconnected by two steam conduits. The inner compartment is also connected to a circulation pump and a heat exchanger. The bottom of this inner compartment is equipped with a quick-release valve which may be used to execute explosive discharge of the treated lignocellulosic material. On top of said apparatus is a cover which allows experiments to be performed under pressurized conditions. For experimentation, lignocellulosic material in form of chips (large particles) may be treated either with heated chemical solution or steam. Materials in form of fibers (fine particles) may be treated by means of vapor or by heat conduction furnished by the outer compartment. Chemical treatment such as impregnation of lignocellulosic materials with chemicals under vacuum or under pressurized conditions, liquid phase or vapor phase cooking of preimpregnated lignocellulosic materials, and explosion pulping of lignocellulosic materials, etc. The temperatures for chemical treatment of lignocellulosic materials can be up to 250.degree. C.
REFERENCES:
patent: 1198990 (1916-09-01), Bashlin
patent: 1905731 (1933-04-01), McKee
patent: 3035962 (1962-05-01), Schinn
patent: 3347741 (1967-10-01), Hutchison
patent: 3397110 (1968-08-01), Rosenblad
patent: 3881986 (1975-05-01), Bachlund
Burns Todd J.
Fisher Richard V.
Law Kwei-Nam
Valade Jacques L.
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