Separation of oils from solids

Cleaning and liquid contact with solids – Processes – Using sequentially applied treating agents

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134 28, 134 40, 134 10, 252 8551, 175 66, 175 46, 175206, 507138, 507139, B08B 308

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051566869

ABSTRACT:
Drill cuttings are cleaned of oil-based drilling mud and oil using a cleaning agent, such as a C6-C10 carboxylic acid, that is preferentially oil soluble at one pH and preferentially water soluble at another pH. The oily cuttings are treated with the carboxylic acid and then washed with an aqueous, alkaline washing solution, which converts the carboxylic acid to its water soluble salt and, with vigorous agitation, lifts most of the oil from the cuttings. In other embodiments, the process is used for cleaning oil-contaminated soil, sand, and gravel, and for separating the oils from the solids in oily sludges.

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"Efficiency of a Single-Stage Cuttings Washer with a Mineral Oil Invert Emulsion and its Environmental Significance" by Maurice Jones et al., Society of Petroleum Engineers of AIME, SPE 12121, copyright 1983.

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