Pulping process

Details Pulping process Pulping process

D - Textiles, Paper

21

C

9/20, 92/56

D21C 3/06 (2006.01) C05C 3/00 (2006.01) D21C 3/26 (2006.01) D21C 7/00 (2006.01) D21C 11/06 (2006.01)

Patent

CA 1095663

Abstract of the Disclosure A versatile process 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. The process of this invention is virtually pollution free in that it pulps without a cooking liquor of harsh chemicals, and the reactant chemicals are easily 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. In this process the lignin is deploymerized without substantial migration from the cellulosic fibers. Depolymerization or digestion of the wood chips is achieved by exposure initially to ammonia and sulfur dioxide for from 10 to 60 minutes depending on the pulp grade desired under controlled pressure and temperature conditions, and subsequently to sulfur dioxide from 10 to 60 minutes also under controlled conditions of temperature and pressure in a digestor 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. Because the reactant chemicals attack the lignin bonds without substantial damage to the .alpha. or hemi-cellulose fractions, a new fiber pulp is produced having properties superior to Sulfite process pulp yet nearly equivalent to Sulfate process pulp in strength. - 1 -

219908

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