Abstract
Non-distillation oil extraction is a process whereby the step required to distillate the solvent (alcohol) to recover residual oil and by-products is eliminated. This is achieved by cooling the extraction products such that oil and some by-products become immiscible and they separate from the alcohol. The effect of Spent Coffee Grounds (SCG)/solvent ratio on non-distillation oil recovery was investigated. It was observed that recovery increased with an increase in ratio for both solvents, ethanol and propanol. The effect of separation temperature was also investigated and it was observed that the highest recovery was achieved at 15 oC. Generally it was observed that propanol recovery for non-distillation extraction was higher than that of ethanol. The main fatty acids present in the SCG oil were found to be palmitic acid (C16:0), stearic acid (C 18:0) and linoleic acid (18:2). Unsaponification values obtained for non-distillation extracted oil were 6.8 and 8.3% for ethanol and propanol respectively. These values are comparable with those of refined oil.