Process for producing cellulose pulp by solid phase digestion

Details Process for producing cellulose pulp by solid phase digestion Process for producing cellulose pulp by solid phase digestion

1977-02-28

1979-01-23

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 43, 162 45, 162 63, 162 76, 162 77, D21C 320

Patent

active

041359674

ABSTRACT:
Wood chips are digested at a temperature above 100.degree. C in contact with a solution of a hydroxide or salt of an alkali metal or alkaline earth metal or ammonium in a solvent which boils above 100.degree. C at atmospheric pressure, such as ethylene glycol. The cellulose pulp is then separated from the dissolved lignin. The dissolved lignin may be precipitated and removed from the solvent and the solvent may then be recycled, so that there is no waste spent liquor. Examples of salts which may be used are sodium phenoxide and a combination of sodium bisulfite and an aldehyde or a ketone.

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