Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With cleaning – preserving or conditioning of apparatus
Patent
1995-01-25
1999-01-12
Drodge, Joseph W.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With cleaning, preserving or conditioning of apparatus
162 61, 162 63, 162 78, D21C 916
Patent
active
058581707
ABSTRACT:
The present invention relates to a method for safely carrying out pressurized peroxide bleaching of pulp, at a consistency exceeding 8%, preferably 10-16%, in a bleaching vessel (1), designed for at least 0.5 MPa overpressure, preferably 0.7 MPa overpressure, with the pulp being fed to the vessel (1) by means of a pump (2), preferably a pump having fluidizing elements and venting, and with the pulp which is being fed to the vessel having a temperature exceeding 90.degree. C., preferably exceeding 100.degree. C., more preferably exceeding 105.degree. C., and with the pulp being bleached with peroxide in a quantity exceeding 5 kg/BDMT, preferably in association with a bleaching stage which bleaches the pulp to a brightness exceeding 75% ISO, characterized in that if plugging and/or power failure occur(s) measures are taken, essentially without using mechanical safety valves, which prevent the pressure in the said bleaching vessel, or an affiliated part, from being allowed to exceed a certain set point.
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PCT International-Type Search Report in Document SE 9404299-1 Aug. 30, 1995 .
Carlsson Torbjorn
Gustavsson Lennart
Drodge Joseph W.
Kvaerner Pulping Technologies AB
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