Desulfurization of Gasoline Using Deep Eutectic Solvents Based on Tetrabutylammonium Bromide
Vijayalakshmi Gosu, Rohitash Kumar, Anantharaj Ramalingam, U. K. Arun Kumar, Amit Kumar Kashyap, Verraboina Subbaramaiah
Abstract
The present study investigated the viability of deep eutectic solvents (DESs) to extract dibenzothiophene (DBT) from model gasoline (iso-octane). Tetrabutylammonium bromide (TBAB)-based DES showed significant DBT extraction capability from the model fuel oil. Furthermore, the sigma profile confirmed that all TBAB-based DES had a significant capacity for DBT extraction from the model oil. The affinity order for the TBAB-based DES is as follows: TBAB/TEG (tri-ethylene glycol) > TBAB/PA (propionic acid) > TBAB/EG (ethylene glycol). To achieve maximum DBT extraction, the influencing parameters were adjusted, and 89% DBT extraction was achieved using the optimum conditions of oil to DES volume ratio of 1:1, with a DBT concentration of 500 ppm, residence time of 30 min, an extraction temperature of 303 K, and extraction stirring speed of 200 rpm.