Global Patent Index - EP 1010805 A1

EP 1010805 A1 2000-06-21 - Calcium removal in pulping

Title (en)

Calcium removal in pulping

Title (de)

Entfernung von Calcium während der Zellstoffherstellung

Title (fr)

Enlèvement de calcium dans un procédé de production de pâte cellulosique

Publication

EP 1010805 A1 (EN)

Application

EP 98850200 A

Priority

EP 98850200 A

Abstract (en)

A process for removal of calcium from wood chips prior to chemical pulping in a kraft pulping process in order to prevent scaling in an evaporation process in the recovery area characterised in that the wood chips are treated with an aqueous solution of uncausticised spent cooking liquor from an evaporation process having at least 30% total solids whereafter the liquid is recycled to an evaporation process at a location where the uncausticised spent cooking liquor has at least 40% total solids.

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

D21C 1/06; D21C 11/10

IPC 8 full level (invention and additional information)

D21C 1/06 (2006.01); D21C 11/10 (2006.01)

CPC (invention and additional information)

D21C 11/106 (2013.01); D21C 1/06 (2013.01)

Citation (search report)

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

EP 1010805 A1 20000621

INPADOC legal status


2001-10-25 [REG DE 8566] DESIGNATED COUNTRY DE NOT LONGER VALID

2001-09-19 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20001222

2001-02-28 [AKX] PAYMENT OF DESIGNATION FEES

2000-06-21 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2000-06-21 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI