Title:
METHOD FOR RECYCLING SULPHUR IN A PULP PRODUCTION PROCESS
Document Type and Number:
WIPO Patent Application WO2004088032
Kind Code:
A3
Abstract:
The invention relates to a method for recycling sulpur in a process for producing paper or paperboard. In the method of the invention, (a) the bisulphite formed from the sulphur recovered in the process cycle is converted to bisulphate by means of an oxidant, the bisulphate being further used as a recycled acid in different process steps, and/or (b) the bisulphite formed from sulphur recovered from the process cycle is converted into sulphur dioxide by means of an acidic substance, the sulphur dioxide being further used in different process steps.
Inventors:
PAREN AARTO (FI)
NYMAN JUHANI (FI)
VIITASAARI JUKKA (FI)
NYMAN JUHANI (FI)
VIITASAARI JUKKA (FI)
Application Number:
PCT/FI2004/000208
Publication Date:
November 25, 2004
Filing Date:
April 02, 2004
Export Citation:
Assignee:
KEMIRA OYJ (FI)
PAREN AARTO (FI)
NYMAN JUHANI (FI)
VIITASAARI JUKKA (FI)
PAREN AARTO (FI)
NYMAN JUHANI (FI)
VIITASAARI JUKKA (FI)
International Classes:
C11B13/02; D21C11/00; D21C11/06; (IPC1-7): D21C11/00; C11B13/02
Domestic Patent References:
| WO1994011571A1 | 1994-05-26 | |||
| WO1988007023A1 | 1988-09-22 | |||
| WO1979000899A1 | 1979-11-15 |
Foreign References:
| DE2516342A1 | 1976-10-28 | |||
| US3654071A | 1972-04-04 | |||
| US3733395A | 1973-05-15 |
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