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Calcium phosphate decontamination of stainless steel surfaces
Author(s) -
Grant Christine S.,
Webb Gregory E.,
Jeon Young W.
Publication year - 1996
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690420324
Subject(s) - brushite , human decontamination , dissolution , calcium , phosphate , solvent , chemistry , materials science , porosity , volumetric flow rate , nuclear chemistry , chemical engineering , mineralogy , metallurgy , composite material , waste management , engineering , physics , organic chemistry , quantum mechanics
A primary constituent in high‐temperature (120–140°C) milk fouling residues is calcium phosphate in the form of calcium phosphate dihydrate (brushite, CaHPO 4 · 2H 2 O) and hydroxyapatite [Ca 5 (PO 4 ) 3 OH]. The removal of these mineral‐rich deposits from stainless steel occurs by dissolution and mechanical cleaning. This research uses a novel solid scintillation technique to noninvasively and continuously investigate the removal of P 32 ‐labeled mixtures of calcium phosphate from inner surface of stainless steel tubes. The proposed mass‐transfer model suggests that the film is initialy removed by dissolution, when compared to the experimental results. An alternative first‐order model presented includes the effects of the solvent flow rate and solvent pH on decontamination rates. This model agrees with the experimental cleaning data over the range of pH and flow rates studied.