Fe. Huggins et al., INVESTIGATION OF ZINC ADDITIVES IN COLIQUEFACTION OF WASTE LUBRICATING OIL AND A BITUMINOUS COAL, Journal of environmental science and health. Part A: Environmental science and engineering, 31(7), 1996, pp. 1755-1766
The behavior and fate of a zinc additive to lubricating oil in the co-
liquefaction of waste lubricating oil and a bituminous coal have been
investigated by means of X-ray absorption fine structure (XAFS) spectr
oscopy. Although the zinc additive appears to remain largely unaltered
during use as zinc dialkyldithiophosphate (ZDDP), it is readily conve
rted to solid zinc sulfide and effectively separated from the desired
liquid hydrocarbon products during the coliquefaction process. It is a
nticipated that similar behavior will be shown by most other environme
ntally important elements.