Extractive desulfurization of pyrolysis tire oil with deep eutectic solvent using hydrodynamic cavitation.

The extractive desulfurization (EXDS) of pyrolytic oil (PO) from organosulfur compound with deep eutectic solvent (DES), tetrabutylammonium bromide-formic acid, using hydrodynamic cavitation (HDC) was investigated. Applying the method of independent variation value one per variable, the effect of the processing parameters of EXDS using HDC: the inlet pressure of the reaction mixture (P), the mass ratio of DES to pyrolysis oil (DES/PO), the temperature of the reaction mixture (T) and the number of passes of the reaction mixture through the cavitation reactor (n), on the degree of desulfurization of pyrolytic oil (DDS) was determined. In order to determine the effect of processing parameters on the DDS, the processing parameters were varied following manners: (a) the value of P was varied in the range of 1-50 atm at DES/PO = 5, T = 298 K and n = 10, (b) the value of DES/PO was varied in the range of 1-10 at P = 30 atm, T = 298 K and n = 10, (c) the value of temperatures was varied within the range 298-338 K at P = 30 atm, DES/PO = 5, and n = 10, and (d) the value of (n) was varied within the range 1-20 at P = 30 atm, DES/PO = 5, and T = 298 K. Based on the obtained results, it was found that the increase in the values of P, DES/PO, T, and n leads to the increase in the value of DDS of pyrolytic oil. The optimal processing parameters EXDS of pyrolytic oil are determined. The model mechanism of the extractive desulfurization of pyrolytic oil with deep eutectic solvent and the influence of cavitation effects on the degree of pyrolytic oil desulfurization are discussed.