Deep eutectic solvent

Choline chloride

Engineering

Petrochemical

Solubility

UNIQUAC

Non-random two-liquid model

Denitrification

Solvent extraction

Solvent

Inorganic chemistry

Chemical engineering

Nitrogen

Chloride

Extraction (chemistry)

Organic chemistry

Alloy

Activity coefficient

Environmental chemistry

Eutectic system

Aqueous solution

Chemistry

Hydrocarbon

Halide

Process Safety and Environmental Protection

The use of deep eutectic solvents (DES) as “green” solvents could solve at least some of the environmental problems associated with the chemical and petrochemical industry. This paper investigates the applicability of DES made of choline chloride and propylene glycol in a molar ratio of 1:3 for the removal of sulfur and nitrogen compounds from hydrocarbon mixtures. Extraction experiments were performed in quasi-three-component systems, quasi-seven-component model systems and real fuel systems. All the experiments confirmed better solubility of pyridine (compared to thiophene) and nitrogen compounds (compared to sulfur ones) in the investigated DES, indicating its potential use as a denitrification agent. The basic application physico-chemical properties of the investigated DES were determined. Its applicability in multistage extraction processes was confirmed, its extraction capacity was determined and the ability of its regeneration by evaporation was demonstrated. Liquid–liquid equilibria in investigated quasi-three-component systems were described successfully by UNIQUAC activity coefficient model.

Deep eutectic solvent based on choline chloride and propylene glycol as a potential medium for extraction denitrification of hydrocarbon fuels