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Experimental data for liquid−liquid equilibrium of the lube-oil cut + furfural system is determined. The effect of the solvent-to-feed ratio and the operating temperature on the distribution of aromatic, naphthenic, paraffinic, and furfural in extract and raffinate phases is investigated. We determined the aromatic, naphthenic, and paraffinic content of raffinate and extract phases by using the ASTM standard methods.

The use of 2,2,4-tri methyl pentane as a cosolvent for extraction of aromatic hydrocarbons from lube cut is studied. Optimized values of extraction temperature and amount of 2,2,4-tri methyl pentane are determined. The liquid−liquid equilibrium between {lube oil + furfural + cosolvent} is examined with the NRTL equation. The binary interaction parameters for the NRTL model are obtained by minimization of an objective function. General binary interaction parameters are computed and reported for estimating the liquid−liquid equilibrium products between 323.15 and 343.15 K. Also, a generalized model is presented for calculation of the refractive index and specific gravity of lube-oil fractions. The calculated results are in good agreement with the results of the experiments.

BACKGROUND: A mathematical modeling approach was used to obtain a simulation model to predict the performance of an industrial rotating disc contactor (RDC) in the extraction of lubricating base oils by furfural. The field data of a lube-oil producing plant was used to validate the model. This model can be used for the parametric study of the RDC column and to investigate the effect of operational data such as solvent and feed temperatures, solvent to feed ratio, and agitation rate on the yield of extraction and on the energy saving value of the extraction. RESULTS:The mathematical modeling of RDC shows good agreement with the plant data with an accuracy of 95% and the model was used to investigate the effect of adding a co-solvent. CONCLUSION: Results show that by using furfural with added 2,2,4 trimethylpentane it is possible to perform the extraction process at a lower process temperature, 363.15 K, compared with 393.15 K using furfural as solvent, and also at a lower 1.3 solvent/feed ratio, compared with 1.5 when furfural alone was used for as the solvent. This process modification leads to saving of 38% of the consumed energy per cubic meter of product in the extraction process. The effect of the rotor speed on aromatic contentUsually industrial RDC towers use a rotor speed between 0 and 12 rpm and using these values, the aromatic content of raffinate wileyonlinelibrary.com/jctb

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