Treatment of oil‐based drill cuttings by hydrophobic deep eutectic solvents

Abstract

During the exploitation of shale gas, there are many oil‐based drill cuttings (OBDC) produced, which are hazardous waste. In this paper, the characteristics of OBDC were analyzed and 25 hydrophobic deep eutectic solvents (DESs) were prepared as extractants for treating OBDC. The results showed that the DES formed by lauric acid and thymol had the highest extraction efficiency. The significant parameters of the extraction process were studied by using total petroleum hydrocarbon (TPH) as an index and the rational extraction conditions were recommended as follows: 0.8:1 mole ratio of lauric acid to thymol, 10:1 mass ratio of DES to OBDC, and 1 h extraction time at 60°C. The TPH of OBDC can be decreased from 14.75 to 0.87 wt.% at this recommended condition. The high extraction efficiency was also confirmed by energy dispersive spectrum results of treated OBDC. In addition, the lauric acid/thymol DES can be recycled and the TPH was still smaller than 1% after three cycles. This research suggests that hydrophobic DES extraction is an effective technology for TPH removal from OBDC.

Deep Eutectic Solvents: Comprehensive Review and Future Directions on Synthesis and Oilfield Applications

“…Their research suggests that the combination of lauric acid and thymol (0.8:1), resulted in a highly effective DES. Furthermore, the total PH of OBDC could be reduced from 14.75 to 0.87 wt % . Similarly, Zhang et al 2022 used hydrophilic DESs for cleaning process of OBDC.…”

“…Furthermore, the total PH of OBDC could be reduced from 14.75 to 0.87 wt %. 142 Similarly, Zhang et al 2022 used hydrophilic DESs for cleaning process of OBDC. The optimal DES consisted of a combination of ChCl, methanol, and water, with a molar ratio of 1:2.5:3.…”