The thermodynamic interactions between sulphur anions and iron, chromium, nickel as well as molybdenum in modern digesting

Outi Hyökyvirta, Timo-Pekka Veijonen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The review is focused on the modern kraft digesting, their polysulphide chemistry and the construction materials of digesters. The most common structural materials of digesters; like austenitic and duplex stainless steels, were studied in alkaline oxidative kraft liquor. The study of structural materials based on thermodynamic. The different chemical behaviours between sulphur anions and the alloying elements of stainless steels; like iron, chromium, nickel and molybdenum, were predicted by potential - pH diagrams. The study is based on the free polysulphide concentrations in digesting liquors while only the concentration of polysulphides or their decomposition products can be harmful for structural material of cooking department. The review can be used when laboratory experiments are planned. Also the review shows the limits of thermodynamic. The thermodynamic data available based on the ideal diluted solutions where the concentration of ions was below 0.01 M. For this reason experimental research is also needed.
Original languageEnglish
Title of host publication10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 2
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages555-576
ISBN (Electronic)951-38-5724-7
ISBN (Print)951-38-5721-2
Publication statusPublished - 2001
MoE publication typeA4 Article in a conference publication
Event10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI - Helsinki, Finland
Duration: 21 Aug 200124 Aug 2001

Publication series

SeriesVTT Symposium
Number215
ISSN0357-9387

Conference

Conference10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI
Abbreviated title10th ISCPPI
CountryFinland
CityHelsinki
Period21/08/0124/08/01

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