Open AccessAcid-Base Behavior in Hydrothermal Processing of Wastes - Final Report
Author(s) -
Keith P. Johnston,
Peter J. Rossky
Publication year - 2000
Language(s) - English
Resource type - Reports
DOI - 10.2172/775047
Subject(s) - hydrothermal circulation , supercritical fluid , base metal , salt (chemistry) , titration , supercritical water oxidation , base (topology) , corrosion , precipitation , chemistry , decomposition , chemical engineering , metal , environmental chemistry , inorganic chemistry , environmental science , materials science , organic chemistry , metallurgy , engineering , meteorology , mathematical analysis , physics , mathematics , welding
A major obstacle to development of hydrothermal oxidation technology has been a lack of scientific knowledge of chemistry in hydrothermal solution above 350 C, particularly acid-base behavior, and transport phenomena, which is needed to understand corrosion, metal-ion complexation, and salt precipitation and recovery. Our objective has been to provide this knowledge with in situ UV-visible spectroscopic measurements and fully molecular computer simulation. Our recent development of relatively stable organic UV-visible pH indicators for supercritical water oxidation offers the opportunity to characterize buffers and to monitor acid-base titrations. These results have important implications for understanding reaction pathways and yields for decomposition of wastes in supercritical water