Process and apparatus for continuously digesting plant fiber...

Details Process and apparatus for continuously digesting plant fiber... Process and apparatus for continuously digesting plant fiber...

D - Textiles, Paper

21

C

92/59

D21C 7/00 (2006.01) D21C 3/20 (2006.01)

Patent

CA 1111694

ABSTRACT OF THE DISCLOSURE A process and an apparatus for continuously digest- ing plant fiber material are described, the plant fiber material being treated with an organic solvent at temp- eratures of 130 - 210°C in a counter-current manner. The plant fiber material is impregnated with an organic sol- vent in an impregnating means and is positively conducted in a downward direction through the reactor. An organic solvent is introduced into the middle reactor zone as an extraction liquor and is conducted upwardly to the plant fiber material in a counter-current. Water is supplied in the bottom reactor zone as a wash liquor and is con- ducted upwardly to the plant fiber material in a counter- current. It is withdrawn in the middle reactor zone. The laden extraction liquor is separated into the essential components lignin, hemicellulose and solvent.

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