Title:
RECYCLING OF SULPHUR IN A PULP PRODUCTION PROCESS
Document Type and Number:
WIPO Patent Application WO2004088033
Kind Code:
A3
Abstract:
The invention relates to a method for recycling sulphur in a preparation process for a chemical pulp, such as a sulphate process. The method is characterised in that the sulphur recovered from the process cycle is converted into bisulphate by means of an oxidant, which bisulphate is then reaused as a recycled acid in various process steps, e.g. for splitting tall oil soap or for preparing magnesium sulphate for bleaching of sulphate pulp.
Inventors:
PAREN AARTO (FI)
NYMAN JUHANI (FI)
NYMAN JUHANI (FI)
Application Number:
PCT/FI2004/000209
Publication Date:
January 06, 2005
Filing Date:
April 02, 2004
Export Citation:
Assignee:
KEMIRA OYJ (FI)
PAREN AARTO (FI)
NYMAN JUHANI (FI)
PAREN AARTO (FI)
NYMAN JUHANI (FI)
International Classes:
C11B13/02; D21C11/00; D21C11/06; (IPC1-7): D21C11/00; C11B13/02
Domestic Patent References:
| WO1988007023A1 | 1988-09-22 | |||
| WO1994011571A1 | 1994-05-26 |
Foreign References:
| US3654071A | 1972-04-04 | |||
| US5628874A | 1997-05-13 | |||
| DE2516342A1 | 1976-10-28 |
Other References:
DATABASE PAPERCHEM [online] THE INSTITUTE OF PAPER SCIENCE AND TECHNOLOGY, ATLANTA, GA, US; BACKMAN, R. ET AL: "Corrosion Due to Acidic Sulfates in Sulfate and Sodium Sulfite Recovery Boilers 1983-06-02", XP002292036, retrieved from DIALOG Database accession no. AB5403539
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