Ybc. Man et Pz. Swe, THERMAL-ANALYSIS OF FAILED-BATCH PALM OIL BY DIFFERENTIAL SCANNING CALORIMETRY, Journal of the American Oil Chemists' Society, 72(12), 1995, pp. 1529-1532
Thermal behavior of palm oil samples drawn from the batch crystallizer
s that failed during crystallization and of a control oil that was dra
wn from a batch that produced good crystallization were analyzed by di
fferential scanning calorimetry under constant heating and cooling con
ditions. Four polymorphs-beta'(2), alpha, beta'(1), and beta(1)-were o
bserved, and their temperatures were tabulated. A rapid and sudden sur
ge of heat demand was observed for samples from failed crystallizers.
Less supercooling values were obtained from the control oil compared t
o the higher values for samples from failed crystallizers. In crystall
ization thermograms, a sharp high-temperature exotherm (high-T peak) a
nd a broad low-temperature exotherm (low-T peak) were observed. Low-T
peaks were found almost invariably stationary at -5.1 to -5.6 degrees
C, and high-T peaks varied depending on the saturation level of the oi
l. A new peak, sandwiched between the high-T and low-T peaks, was obse
rved for the control oil.