ABSTRACT
Six organic solvents (methanol, ethanol, acetone, ethyl acetate, n-hexane and petroleum ether) were evaluated for their adiabatic compression heating (ACH) characteristics. A specially designed data acquisition system was used to gather ACH data under different high pressure treatment conditions: pressure, 0.1–400 MPa and initial temperature, 5°C and 25°C. Petroleum ether had the highest temperature increase (44°C) followed by n-hexane, ethyl acetate, acetone, methanol and ethanol (33°C) under the experiment conditions. The ACH values for the solvents exhibited a decreasing trend with an increase in pressure and only slightly affected by the initial temperature. An empirical equation was obtained for predicting the ACH of the solvents as a function of pressure at 5°C and 25°C which gave a good fit ( > 0.99) with experimental data. Thermal effect due to ACH of solvents during the high pressure processing is crucial but neglected most often when studying high pressure extraction.
Disclosure statement
No potential conflict of interest was reported by the authors.