D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
8/79, 9/36.2
D21C 9/10 (2006.01) B01D 53/52 (2006.01) D21C 9/14 (2006.01) D21C 11/00 (2006.01)
Patent
CA 1332023
ABSTRACT OF THE DISCLOSURE The invention relates to a process for cooking and bleaching pulp in a closed system, in which the spent liquors from the cooking and the bleaching are recovered and their chemicals are regenerated and recycled as cooking and bleaching chemicals. In the process according to the invention the melt, which has been obtained by burning the spent liquor deriving from the cooking and the bleaching of the pulp material and the secondary product to be obtained in the preparation of chlorine dioxide, are dissolved in order to form green liquor, which contains plenty of sulphide and chloride. This green liquor is divided into two flows, of which one is causticized in order to form white liquor which is returned to the cooking step. The sulphide contained in the second flow of green liquor is separated as hydrogen sulphide which is further burned into sulphur dioxide which is used for the preparation of chlorine dioxide and the acidation of the pulp in the bleaching step. The chloride contained in this second flow of green liquor is again separated as sodium chloride from which subsequently is electrolytically prepared sodium chlorate, which is used for the preparation of chlorine dioxide. The sulphide and chloride contained in this second flow of green liquor are thus transformed into chemicals, which are usable in the bleaching step.
507577
Gowling Lafleur Henderson Llp
Kvaerner Power Oy
LandOfFree
Process for cooking and bleaching pulp does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for cooking and bleaching pulp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for cooking and bleaching pulp will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1307297