Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With non-fiber material added to product
Patent
1979-10-11
1981-03-31
Smith, William F.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With non-fiber material added to product
162 13, 162 14, 162 15, 162 16, 162 28, 162 47, 162 57, 162 60, 162 64, 162 70, 162 77, 162 86, 162163, 162165, 162225, 71 25, 71 64C, 71DIG2, 260 175, 260124R, 264122, D21C 306, D21C 326
Patent
active
042591473
ABSTRACT:
A versatile process and apparatus is presented for producing, in high yields, many different grades of pulp from a single wood specie or for pulping any specie or type of woody material, and for storage and recycling of the by-product liquid and gaseous materials. The process of this invention is virtually pollution free, and the reactant chemicals are recoverable from the by-products. In the alternative, the by-products themselves have a commercial value which may forestall recovery of the reactants. The lignin constituent extracted from the pulp is usable as a resin binder, a wood rehardening agent, or a glue. Depolymerization or digestion of the wood chips is achieved by exposure initially to ammonia and sulfur dioxide for from 10 to 60 minutes or more depending on the parent wood and pulp grade desired under controlled pressure and temperature conditions, and subsequently to sulfur dioxide from 10 to about 60 minutes also under controlled conditions of temperature and pressure in a digester vapor dome adapted to suspend a chip mass in the reactant gases. The digested chips are then defibrated in a lignin dissolving solution of monoethanolamine to extract the lignin constituent.
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New Fibers International
Smith William F.
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