TY - GEN
T1 - The thermodynamic interactions between sulphur anions and iron, chromium, nickel as well as molybdenum in modern digesting
AU - Hyökyvirta, Outi
AU - Veijonen, Timo-Pekka
N1 - Project code: V8SU00883
PY - 2001
Y1 - 2001
N2 - 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.
AB - 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.
M3 - Conference article in proceedings
SN - 951-38-5721-2
T3 - VTT Symposium
SP - 555
EP - 576
BT - 10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 2
PB - VTT Technical Research Centre of Finland
CY - Espoo
T2 - 10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI
Y2 - 21 August 2001 through 24 August 2001
ER -