Kraft mill recycle process

Details Kraft mill recycle process Kraft mill recycle process

D - Textiles, Paper

21

C

9/17

D21C 3/00 (2006.01) D21C 9/10 (2006.01)

Patent

CA 1103412

ABSTRACT A cellulosic pulp and bleaching process is described. The process integrates two cycles, one is a digestor liquor cycle and the other is a sulfur cycle, The digestor liquor cycle comprises the steps of digesting a fibrous cellulosic feed to form a pulp, separating the pulp and bleaching it in at least one stage with chlorine dioxide, evaporating and burning the remaining waste liquor to form a smelt, dissolving the smelt to form a green liquor and utilizing the green liquor, after as at least a portion of the feed stock for the digestor step. The sulfur cycle of the present invention utilizes a portion of the green liquor of the digestor liquor cycle. The green liquor is carbonated to form a bicarbonate which is then stripped of H2S. The H2S is converted into H2SO4 and utilized as a feed stock to a chlorine dioxide generator. The chlorine dioxide generator utilizes H2SO4 as feed stock and produces Na2SO4 as a by-product. The Na2SO4 by-product from the chlorine dioxide generator is furnaced in common with the evaporated waste pulping liquor from the digestor liquor cycle to form a common smelt, which is dissolved to form a green liquor, a portion of which is used in the sulfur cycle and a portion of which is used in the digestor cycle.

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