Process for producing and flash drying high yield mechanical cel

Details Process for producing and flash drying high yield mechanical cel Process for producing and flash drying high yield mechanical cel

1983-05-02

1985-08-27

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Mechanical defibration in the presence of heated gas or gas...

162 28, 162 46, 162 47, D21C 112, D21C 116

Patent

active

045376557

ABSTRACT:
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 in a disc refiner 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. Water vapor produced in the flash dryer is condensed and recycled to the disc refiner.

REFERENCES:
patent: 2826478 (1958-03-01), Schucker
patent: 3871951 (1975-03-01), Drew
patent: 4043049 (1977-08-01), Hedstrom
patent: 4207139 (1980-06-01), Haikkala et al.
patent: 4231842 (1980-11-01), Ojala
patent: 4259148 (1981-03-01), Beath et al.
patent: 4326913 (1982-04-01), Mattsson
patent: 4357208 (1982-11-01), Peterson et al.
patent: 4421595 (1983-12-01), Huusari
patent: 4426258 (1984-01-01), Browning

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