System and process for sulfonating mechanical pulp fibers

Details System and process for sulfonating mechanical pulp fibers System and process for sulfonating mechanical pulp fibers

D - Textiles, Paper

21

C

9/13, 92/34

D21C 3/04 (2006.01) D21C 3/26 (2006.01) D21C 9/00 (2006.01)

Patent

CA 1250702

ABSTRACT OF THE DISCLOSURE A highly economical system and process for enhancement of mechanical pulp wood fibers presented in a relatively high consistency slurry form featuring in use thereof the steps of mixing a portion of said slurry and a sodium sulfite solution in proportioned amounts to dilute said slurry to a level of consistency not materially in excess of 7% and expose surface portions of its fiber content to and provide contact thereof by a relatively minor portion of the sulfite of said solution to initiate reaction therebetween and commence sulfonation thereof, limiting said mixing to a relatively brief interval of time, then placing the so diluted slurry in a quiescent state wherein its fiber content is held in suspension at a temperature level not exceeding 212°F. for a period of time sufficient to permit said reaction to quietly develop to produce a sulfonation of the contacted fiber content to a level not materially less than about 0.5%, thereafter extracting liquor from said mixture inclusive of the major portion of the sulfite of said sodium sulfite solution as first introduced to form Part of said mixture for reuse on a further like portion of said slurry, and placing that portion of said mixture from which liquor has been extracted in a pressurized environment having a temperature in excess of 212°F. for a period of time not less than about 10 minutes to drive said sulfonation to a level in excess of 0.9%. The resulting pulp is advantageously suited for application to and use in various manner and proportion in the production of a mechanical pulp furnish especially suited for the production of newsprint and/or specialty grade papers.

485865

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