A method for removal of an organic amine from a hydrocarbon stream includes mixing the hydrocarbon stream including the amine with an aqueous inorganic acid in a volumetric ratio of hydrocarbon stream: aqueous inorganic acid of greater than 1.5:1 to 5:1, phase separating a hydrocarbon phase and an aqueous phase, removing the hydrocarbon phase, mixing the aqueous phase with an aqueous alkaline solution, phase separating the aqueous phase and an organic phase, and removing the organic phase. The aqueous inorganic acid has a concentration of greater than or equal to 30 weight percent. The disclosed method results in improved phase separation time during an amine removal process.

Processes for removing sulfur and nitrogen contaminants from hydrocarbon streams are described. The processes include contacting the hydrocarbon stream comprising the contaminant with lean halometallate ionic liquid an organohalide resulting in a mixture comprising the hydrocarbon and rich halometallate ionic liquid comprising the contaminant. The mixture is separated to produce a hydrocarbon effluent and a rich halometallate ionic liquid effluent comprising the rich halometallate ionic liquid comprising the contaminant.

Processes for removing sulfur and nitrogen contaminants from hydrocarbon streams are described. The processes include contacting the hydrocarbon stream comprising the contaminant with lean halometallate ionic liquid an organohalide resulting in a mixture comprising the hydrocarbon and rich halometallate ionic liquid comprising the contaminant. The mixture is separated to produce a hydrocarbon effluent and a rich halometallate ionic liquid effluent comprising the rich halometallate ionic liquid comprising the contaminant.