Alkaline extraction initiated ozone bleaching of kraft pulp

Details Alkaline extraction initiated ozone bleaching of kraft pulp Alkaline extraction initiated ozone bleaching of kraft pulp

D - Textiles, Paper

21

C

9/16, 8/78

D21C 9/10 (2006.01) D21C 3/02 (2006.01) D21C 9/153 (2006.01) D21C 9/16 (2006.01)

Patent

CA 1178756

ABSTRACT A multi-stage process is disclosed for the bleaching and de- lignification of lignocellulosic pulps which comprises the follow- ing steps in sequence: (a) extracting a lignocellulosic pulp slurry with alkali while maintaining the slurry pH above about 10; (b) washing the pulp slurry with an acid at a pH below 3 whereby the heavy metal cations are removed from the lignocel- lulosic pulp slurry in order to avoid detrimental effects during succeeding bleaching stages; (c) passing a stream of ozone through the pulp slurry while maintaining the slurry pH below about 5; (d) extracting the pulp slurry with alkali while maintain- ing the pH of the slurry from about 7 to about 10; and (e) passing a stream of ozone through the pulp slurry while maintaining the slurry pH below about 5.

398483

Affiliated with

Also associated with

Rating

Alkaline extraction initiated ozone bleaching of kraft 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 Alkaline extraction initiated ozone bleaching of kraft pulp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alkaline extraction initiated ozone bleaching of kraft pulp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1175372