Paraffinic concentrates were isolated from a couple of Venezuelan asphalts, one paraffinic in nature and the other naphteno-aromatic Multigram scale isolation required two steps. The first one was the separation of neutral hydrocarbons by means of soxhlet extractors filled with clay and extracted with hot cyclohexane. The second step comprised the cryogenic wax crystallization and filtration from neutral hydrocarbons diluted in methyl ethyl ketone, brought to -10°C. Typical operations comprised 800g of asphalt and recovery of 20g of waxes.
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Carbognani et al. (1998) studied this question.
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