
An image depicting the CO₂-responsive cleaning of oil-based drilling mud and the recovery of total petroleum hydrocarbons (TPH) and microemulsion using an amine-free hydrophobic deep eutectic solvent (HDES) microemulsion formed with ethanol and water under NaOH induction. The image illustrates the responsive process and the demulsification of the microemulsion to release TPH, highlighting a green and sustainable approach.

A professional scientific graphical abstract suitable for an...