Method and apparatus for continuous hydrolysis of cellulosic fib

Details Method and apparatus for continuous hydrolysis of cellulosic fib Method and apparatus for continuous hydrolysis of cellulosic fib

1974-08-26

1979-11-20

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 52, 162 60, 162 76, 162237, 162246, D21C 102, D21C 104, D21C 302, D21C 324

Patent

active

041749979

ABSTRACT:
A method and apparatus for continuously hydrolizing finely comminuted cellulosic fiber material and separately extracting the acid hydrolysate therefrom. Cellulosic material is fed into an upright elongated reaction vessel near the upper or top portion thereof and heated to hydrolysis temperature. The heated fiber material then passes downward through the reaction vessel and is concurrently treated by exposure to a short liquid phase which comprises concurrent impregnation and simultaneous concurrent hydrolysis to partially hydrolize the fiber material. The material is then exposed counter-currently to a liquid phase comprising a counter-current wash with simultaneous hydrolysis of a wash liquid which has been introduced from the bottom or lower portion of the reaction vessel, the wash liquid having been preheated to full hydrolysis temperature. The hydrolysate is then extracted and removed from the fiber material and the fiber material (free of hydrolysate) is discharged from the lower portion of the reaction vessel.

REFERENCES:
patent: 2858211 (1958-10-01), Durant et al.
patent: 3380883 (1968-04-01), Richter et al.
patent: 3413189 (1968-11-01), Backlund
patent: 3429773 (1969-02-01), Richter
patent: 3814664 (1974-06-01), Carlsmith

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