Method for avoiding mechanical damage of pulp

Details Method for avoiding mechanical damage of pulp Method for avoiding mechanical damage of pulp

D - Textiles, Paper

21

C

D21C 7/08 (2006.01) D21C 3/22 (2006.01) D21C 9/02 (2006.01)

Patent

CA 2373490

A method for producing chemical pulp from cellulosic material by means of alkaline cooking, including cooking the material to pulp at cooking temperature in a digester, reducing the temperature at the end of the cook, substantially relieving the overpressure in the digester and then discharging the pulp from the digester by means of pumping. The method is characterized in that the pulp is cooled to essentially 85 °C to 70 °C before pumping cooked material as a fluid suspension from the digester, and that the temperature of the cooked material is maintained in the same temperature range and at a pH level being between 10 and 13, between the digester and a first delignification/bleaching stage, thus avoiding mechanical damage of cellulosic material.

La présente invention concerne un procédé de production de pâte chimique à partir de matériau cellulosique par cuisson alcaline, qui consiste à transformer le matériau en pâte par cuisson à température dans un lessiveur, à réduire la température à la fin de la cuisson, à diminuer sensiblement la surpression dans le lessiveur et à vider la pâte du lessiveur par pompage. Le procédé est caractérisé en ce que la pâte est refroidie essentiellement vers 85 DEG C à 70 DEG C avant pompage, à partir du lessiveur, du matériau cuit qui se présente comme une suspension fluide, et en ce que la température du matériau cuit est maintenue, dans le même domaine avec une valeur de pH comprise entre 10 et 13, entre le lessiveur et une première étape de délignification/blanchiment, ce qui permet d'éviter une dégradation mécanique du matériau cellulosique.

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