Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Including recovery of organic by-product
Patent
1976-09-17
1978-07-11
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Including recovery of organic by-product
162 29, 162 40, 162 42, 162 68, 162 77, D21C 320
Patent
active
041000161
ABSTRACT:
Solvent pulping of wood chips or other fibrous plant material is effected using an aqueous solution of a lower aliphatic alcohol in a plurality of batch extraction vessels. The charge in each vessel is heated rapidly to pulping temperature by recirculation of a primary extraction liquor having a relatively high dissolved solids content, and thereafter the charge is subjected to a series of once-through extractions or washes with successively cleaner liquors, including a final extraction or wash with fresh liquor. The extraction liquor from one extraction stage in one vessel is used in another extraction stage in another vessel. Upon completion of the extraction, the liquor is drained from the vessel, the vessel is depressurized to a solvent condenser, and the remaining solvent is steam stripped from the charge and recovered. The used extraction liquor is treated in an alcohol recovery system by flash vaporization, condensation of the solvent vapors, and vacuum stripping of the residual liquor with steam. The alcohol-free extract is then treated to recover a concentrated aqueous lignin suspension and a concentrated aqueous carbohydrate solution.
REFERENCES:
patent: 1856567 (1932-05-01), Kleinert et al.
patent: 2003347 (1935-06-01), Dreyfus
patent: 2037001 (1936-04-01), Aronousky
patent: 2106797 (1938-02-01), Dreyfus
patent: 2382044 (1945-08-01), Fisher
patent: 3253976 (1966-05-01), Bocci
patent: 3585104 (1971-06-01), Kleinert
patent: 3887426 (1975-06-01), Fogarassy
Kleinert, T. N., "Organosolv Pulping With Aqueous Alcohol", TAPPI, vol. 57, #8, pp. 99-102.
Cowan Wavell F.
Diebold Vincent B.
Walsh John K.
Bashore S. Leon
C P Associates Limited
Smith William F.
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