Decolorizing brown fibers in recycled pulp

Details Decolorizing brown fibers in recycled pulp Decolorizing brown fibers in recycled pulp

1995-09-13

1998-03-31

Czaja, Donald E.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 7, 162 4, 162 55, 162 23, D21C 502

Patent

active

057334129

ABSTRACT:
The invention relates to a method for decolorizing paper pulp containing colored fibers. The paper is first pulped and subjected to fine screening. The screened pulp is then dispersed at a temperature in excess of 100.degree. C. and a pressure exceeding one atmosphere absolute pressure. Prior to the dispersing step a first agent (a reducing agent or oxidizing agent) is introduced to the pulp. A second agent is introduced to said pulp after introduction of the first agent. The second agent is an oxidizing agent when the first agent is a reducing agent, and a reducing agent when the first agent is an oxidizing agent. Finally, the dispersed pulp is recovered after the colored fibers are decolorized.

REFERENCES:
patent: 4431482 (1984-02-01), Heinbockel et al.
patent: 4435249 (1984-03-01), Marham et al.
patent: 4612088 (1986-09-01), Nardi
patent: 5073301 (1991-12-01), Suess et al.
patent: 5129987 (1992-07-01), Joachimides et al.
patent: 5176793 (1993-01-01), Kurtz
patent: 5211809 (1993-05-01), Naddeo et al.
patent: 5234544 (1993-08-01), Naddeo
patent: 5249716 (1993-10-01), Hache et al.
patent: 5266158 (1993-11-01), Hill et al.
patent: 5298118 (1994-03-01), Devic
patent: 5324390 (1994-06-01), Naddeo et al.
patent: 5332471 (1994-07-01), Naddeo et al.
patent: 5338402 (1994-08-01), Devic et al.
patent: 5378321 (1995-01-01), Delcourt
patent: 5451296 (1995-09-01), Pikulin et al.
patent: 5464501 (1995-11-01), Kogan et al.
Naddeo et al., "Oxidative methods offer alternative to chlorine bleaching wastepaper", Pulp and Paper, v66, n11, p. 71(7), Nov. 1992.
Michael I. Berger et al. of Degussa Corporation, "Advanced Bleaching Technology for Secondary Fibers", pp. 4-7-0 to 4-7-11 with Tables I & II and Figures 1-20, 1990.
Wolfgang H. Matzke et al. of Research and Development Center, "Various Approaches for Understanding and Improving Secondary Fiber Brightness", pp. 698-706, 1990.
Tappi Press, Tappi Proceedings, "1990 Pulping Conference Book 2", cover page and pages 507-515, 1990.

Affiliated with

Also associated with

Rating

Decolorizing brown fibers in recycled 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 Decolorizing brown fibers in recycled pulp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decolorizing brown fibers in recycled pulp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-47969