D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
92/60
D21C 11/06 (2006.01) D21C 9/02 (2006.01)
Patent
CA 1229757
ABSTRACT OF THE DISCLOSURE A process is provided for washing pulp coming from a digesting stage in a plurality of steps at a pressure above atmospheric in at least one of the steps and wherein washing filtrate from a subsequent step or fresh water is used as a washing liquid in a given step. The process includes the following interrelated steps: subjecting the pulp to a plurality of successive washing steps from a first to a last step; heat exchanging outgoing washing filtrate from each washing step prior to the last washing step with washing liquid going into a subsequent washing step; heat exchanging a part of a filtrate from a second washing step with a filtrate coming from the first washing step; combining the part of the filtrate from the washing step with a cooking liquor conveyed to a digestion processing stage; supplying fresh water as a diluting and washing liquid in a next-to-last step and the last step; heating exchanging the fresh water with the washing filtrate from the first washing step and a washing filtrate from the last washing step; heating exchanging gases leasing each washing step subsequent to the first washing step with the fresh water; subsequently using the fresh water heat exchanged with the gases as a diluting and washing liquid in the last step, wherein condensates and uncondensably-gaseous fractions are formed from the gases subsequent to heat exchanging with the fresh water; combining the condensates with a diluting liquid used in each washing step prior to the next-to-last washing step; heat exchanging the uncondensably-gaseous fractions with the fresh water; and heat exchanging the cooking liquor with incoming pulp to the first washing step. This process enables the washing of the pulp to proceed with a maximum recovery of energy.
451534
Andersson Alf O.
Borden Ladner Gervais Llp
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