Patent · US Expired

Process for bleaching and delignification of lignocellulosic

US5091054A · kind A · utility

19Cited by

0References

27Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Juergen Meier · Triberg, DE
Gerhard Arnold · Hanau, DE

Key dates

Filing date	Aug 18, 1989
Grant date	Feb 25, 1992
Priority date	—
Expiry date	Aug 18, 2009

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21C9/163
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Delignification and bleaching of lignocellulosic material is enhanced after the pulp has been treated with peroxomonosulfuric acid. The starting pH of the reaction with peroxomonosulfuric acid is between 7 and 11, and the reaction is continued until a final pH of 3 to 5 obtained. Subsequently the pulp is delignified and bleached with peroxide and/or oxygen.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.