Global Patent Index - EP 1088130 A2

EP 1088130 A2 2001-04-04 - PEROXIDE, OXYGEN, AND PEROXIDE/OXYGEN BRIGHTENING OF CHEMICAL AND MIXED WASTE PULPS

Title (en)

PEROXIDE, OXYGEN, AND PEROXIDE/OXYGEN BRIGHTENING OF CHEMICAL AND MIXED WASTE PULPS

Title (de)

PEROXIDE, SAUERSTOFF, UND PEROXIDE/SAUERSTOFF BLEICHEN VON ZELLSTOFFEN UND ALTPAPIERFASERSTOFFEN

Title (fr)

ECLAIRCISSEMENT DE PATES CHIMIQUES ET DE PATES DE VIEUX PAPIERS MELANGES, AU MOYEN DE PEROXYDE, D'OXYGENE OU DE PEROXYDE/OXYGENE

Publication

EP 1088130 A2 (EN)

Application

EP 98922379 A

Priority

US 9810070 W

Abstract (en)

[origin: WO9960201A2] A composition and method for use in the peroxide, oxygen, or peroxide/oxygen stage of brightening pulps with less than 18 % lignin utilize a megnesium compound in a sodium silicate solution to form a higher percentage of high molecular weight silicates. Such high molecular weight silicates preferentially adsorb transition metal impurities which, if left in solution, would tend to decompose hydrogen peroxide and organic peroxides. Hydrogen peroxide is added to peroxide and peroxide/oxygen stages, while it is generated, along with organic peroxides, during an oxygen stage. Decomposition decreases the amount of peroxide that actually reacts with lignin and generates free radicals that attack the desired product, carbohydrate fibers. The high molecular weight silicates can be formed by using any magnesium compound which dissociates to form Mg(OH)<+> cations, which in turn cause a silicate polymerization reaction. The formation of Mg(OH)<+> cations from magnesium compounds occurs most realidy over a pH range of at least about 8 and preferably between about 8 and about 12. The magnesium compound is added in an amount to achieve an Mg:SiO2 mass ratio of between about 1:46 to about 1:2, and preferably between about 1:15 to about 1:3.

IPC 1-7 (main, further and additional classification)

D21C 9/10; D21C 9/147; D21C 9/16

IPC 8 full level (invention and additional information)

D21C 9/10 (2006.01); D21C 9/147 (2006.01); D21C 9/16 (2006.01)

CPC (invention and additional information)

D21C 9/147 (2013.01); D21C 9/1036 (2013.01); D21C 9/163 (2013.01)

Citation (search report)

See references of WO 9960201A3

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9960201 A2 19991125; WO 9960201 A3 20000803; AT 263268 T 20040415; AU 7493898 A 19991206; CA 2332304 A1 19991125; CA 2332304 C 20050111; DE 69822893 D1 20040506; EP 1088130 A2 20010404; EP 1088130 B1 20040331; MX PA00011196 A 20030422

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