EP 0681625 A4 19970312 - IMPROVED PROCESS AND COMPOSITION FOR DELIGNIFYING A LIGNOCELLULOSIC MATERIAL.
Title (en)
IMPROVED PROCESS AND COMPOSITION FOR DELIGNIFYING A LIGNOCELLULOSIC MATERIAL.
Title (de)
VERBESSERTES VERFAHREN UND ZUSAMMENSETZUNG ZUR DELIGNIFIZIERUNG EINES LIGNOZELLULOSISCHEN MATERIALS.
Title (fr)
PROCEDE AMELIORE ET COMPOSITION DE DELIGNIFICATION D'UN MATERIAU LIGNOCELLULOSIQUE.
Publication
Application
Priority
- US 9401085 W 19940131
- US 1205793 A 19930201
Abstract (en)
[origin: WO9418386A1] A process for delignifying a lignocellulosic material comprising exposing the material at pH 6.0 to 9.5 to a mixture of monopersulfuric acid and a ketone of formula (I), wherein R<1> and R<2> are independently selected from the group consisting of alkyl and aryl, or R<1> and R<2> together form a carbocycle. Also disclosed is a kraft pulp delignification mixture comprising in combination: (a) water; (b) from about 0.05 to about 0.3 moles per liter of a ketone as above; (c) from about 0.0008 to about 0.50 moles per liter of monopersulfuric acid; and (d) sufficient buffer to maintain the pH between about pH 6 and about pH 9.5.
IPC 1-7
IPC 8 full level
C01B 15/08 (2006.01); D21C 9/10 (2006.01); D21C 9/16 (2006.01); D21H 11/00 (2006.01)
CPC (source: EP)
C01B 15/08 (2013.01); D21C 9/1036 (2013.01); D21C 9/16 (2013.01); D21C 9/166 (2013.01)
Citation (search report)
- [PX] EP 0529326 A1 19930303 - AUSIMONT SPA [IT]
- See references of WO 9418386A1
Designated contracting state (EPC)
BE DE ES FR GB IT PT SE
DOCDB simple family (publication)
WO 9418386 A1 19940818; AU 6130794 A 19940829; BR 9405754 A 19951128; CA 2154778 A1 19940818; EP 0681625 A1 19951115; EP 0681625 A4 19970312; FI 953651 A0 19950731; FI 953651 A 19950731; JP H08508791 A 19960917; NO 952913 D0 19950721; NO 952913 L 19950721; NZ 262009 A 19960625
DOCDB simple family (application)
US 9401085 W 19940131; AU 6130794 A 19940131; BR 9405754 A 19940131; CA 2154778 A 19940131; EP 94907926 A 19940131; FI 953651 A 19950731; JP 51812994 A 19940131; NO 952913 A 19950721; NZ 26200994 A 19940131