Process for inexpensively producing cellulose pulp

Details Process for inexpensively producing cellulose pulp Process for inexpensively producing cellulose pulp

D - Textiles, Paper

21

C

9/2, 92/57.3

D21C 1/00 (2006.01) D21C 9/18 (2006.01)

Patent

CA 1209837

PROCESS FOR INEXPENSIVELY PRODUCING CELLULOSE PULP ABSTRACT OF THE DISCLOSURE A process is provided for inexpensively producing high yield mechanical cellulose pulp having good paper properties, which comprises preheating particulate lignocellulosic material; defibrating the preheated material under a superatmospheric steam pressure within the range from about 2 to about 4.5 bar above atmospheric pressure under conditions such that steam is generated during the defibration; continuing the defibration until a cellulose pulp is obtained having a freeness within the range from about 300 to about 700 ml CSF; flash drying the defibrated cellulose pulp while maintaining a superatmospheric steam pressure within the said range during the drying; withdrawing steam generated during the defibration and passing it in indirect heat exchange with steam utilized in the flash drying, so as to utilize in the drying at least 30% of the heat content thereof; and then removing and baling the flash-dried cellulose pulp.

427387

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