Abstract
1. Mono- and dimethylformamide possess high solvent power toward aromatic hydrocarbons. The aqueous N-methylformamides studied here provide higher extraction of aromatic hydrocarbons at room temperature, and are more selective, than di- or triethylene glycol under the usual conditions of use of these solvents. 2. The value of the selectivity of the N-methylformamides can be changed by addition of water. With increase in water content of the solvent, the selectivity of mono- and dimethylformamide is increased, but their solvent power is decreased. 3. In the case of identical saturation capacity of the extraction phase for aromatic hydrocarbons (identical solvent powers with respect to the desired component) mono- and dimethylformamide have practically equal selectivity. 4. The selectivity of the N -methylformamides studied in extraction of aromatic hydrocarbons from mixtures with paraffins is greater than in extraction from mixtures with naphthenic hydrocarbons. 5. The selectivity of monomethylformamide depends very little on the molecular weight of the aromatic hydrocarbons being extracted.
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