Apparatus for chemical treatment of lignocellulosic materials

Details Apparatus for chemical treatment of lignocellulosic materials Apparatus for chemical treatment of lignocellulosic materials

D - Textiles, Paper

21

C

92/57.3

D21C 7/00 (2006.01) D21F 5/08 (2006.01)

Patent

CA 1309889

ABSTRACT OF THE DISCLOSURE 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 the this inner compartment is equipped with a quick-release valve which may be used to execut 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 vapour or by heat conduction furnished by the outer compartment. Chemical treatments such as impregnation of lignocellulosic materials with chemicals under vacuum or under pressurized conditions, liquid phase or vapour phase cooking of pre-impregnated lignocellulosic materials, and explosion pulping of lignocellulosic materials, etc. The temperatures for chemical treatment of lignocellulosic materials can be up to 250°C.

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