High yield chemimechanical pulping processes

Details High yield chemimechanical pulping processes High yield chemimechanical pulping processes

D - Textiles, Paper

21

C

9/8

D21C 3/06 (2006.01) D21B 1/02 (2006.01) D21C 1/04 (2006.01)

Patent

CA 1123554

C.I.P. 2300-C HIGH YIELD CHEMIMECHANICAL PULPING PROCESSES Abstract of the Disclosure An improved, three-stage process for producing high yield chemimechanical pulps from wood or other ligno- cellulosic materials, such as chips, whereby, in the first stage, the wood or other lignocellulosic material is treated with sulfur dioxide gas or aqueous solution of sulfur di- oxide, whereby sufficient sulfur dioxide is present to pro- vide an amount of at least about 1 percent by weight based -on weight of wood or other lignocellulosic material; in the second stage, said wood is sulfonated in an aqueous solution of sodium sulfite at a temperature of between about 100°C. and 150°C. for between about 10 and 90 minutes, said aqueous solution having a pH of between about 6 and 8.5 at the end of said sulfonating, without reducing the pulp yield to below about 90 percent; and, in the third stage, subjecting the resulting sulfonated wood to mecha- nical defibration.

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