Abstract
Abstract In order to separate and characterize the microcrystalline waxes from Suez and Alexandria crude petrolatums, multistage fractional crystallization technique has been used to fractionate Suez crude petrolatum by using n-hexane as a single solvent at different fractionating temperatures ranging from 20 to −20°C and at two different dilution and washing solvent ratios. Suez and Alexandria crude petrolatums were subjected also to multistage fractional crystallizations with solvent mixture at ambient temperature of 20°C and at fixed dilution and washing solvent ratios of 4:1 and 2:1 by weight, respectively. The solvent mixture composed of n-hexane as the main solvent and different percentages of absolute ethyl alcohol (ranging from 10 to 50 wt.%) as antisolvent. The solvent to feed ratios of dilution and washing were studied in the range of 2:1 to 8:1 and 2:1 to 6:1 by weight, respectively. Finally, one stage fractional crystallization has been done at the most suitable conditions to separate the microcrystalline waxes from Suez and Alexandria crude petrolatums followed by finishing via percolation in molten state through an activated bauxite column. The resulting finished microcrystalline waxes are evaluated according to the standard specifications of microcrystalline waxes, molecular type composition, degree of crystallinity, and scanning electron microscope (SEM).
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