Phase Equilibrium of Systems Cyclohexene + Water + Cyclohexanone + N-Methyl-2-pyrrolidone (+Acetonitrile)

Abstract

The paper presents the results of the study of phase equilibrium in the system formed in the reaction of cyclohexene oxidation (cyclohexene + water + cyclohexanone + solvent). Pure N-methyl-2-pyrrolidone or binary mixture acetonitrile + Nmethyl-2-pyrrolidone was considered as a solvent. The method of studying was mathematical modeling on the base of the nonrandom two-liquid model. Thermodynamic-topological analysis was used to analyze the structure of the vapor−liquid equilibrium diagram. The mixture separation flowsheets were proposed and parameters of column work were determined using simulation in Aspen Plus V.10.0. The possibility of isolation of the target component (cyclohexanone) without the use of special separation methods was proved. The results obtained showed the prospects of replacement of pure acetonitrile or previously proposed dimethylsulfoxide and dimethylacetamide by solvents considered.

Separation and Purification of Methyl Isobutyl Ketone from Acetone + Isopropanol + Water + Methyl Isobutyl Ketone + Methyl Isobutyl Carbinol + Diisobutyl Ketone Mixture

“…This method is well-known and widely used to study the phase behavior of quaternary mixtures. 24 − 29 …”

“…The study of the VLE diagram was based on thermodynamic-topological analysis. This method is well-known and widely used to study the phase behavior of quaternary mixtures. − …”

“…Table lists the types of all the singular points and their Poincaré indexes. Checking the diagram by the azeotropy rule − showed that the latter is constructed correctly (the sum of Poincaré indexes is equal to 2): where N is the number of singular points of the node type, S is the number of singular points of the saddle type, +/– is the sign of the Poincaré index, and i is the boundary singular point. The stable and unstable nodes have a Poincaré index of ⟨⟨+1⟩⟩ in five-component systems; for this reason, the sign + or – near a point of type N is not specified.…”

“…The paper presents the results of the study of phase equilibrium of the six-component mixture A + IP + W + MIBK + MIBC + DIBK (one-step synthesis from isopropyl alcohol) using thermodynamic-topological analysis. − Two separation flowsheets of different structure were proposed, the distillation column operating parameters were determined. The method of studying is mathematical modeling using Aspen Plus V.10.0.…”

Liquid–Liquid Equilibrium and Solubility for Ternary Systems Cyclohexene (Cyclohexanone) + Water + 1-Methylpyrrolidin-2-one (N,N-Dimethylacetamide) at 295.15 K and 99.32 kPa

“…In recent studies, based on the study of the physicochemical properties of a series of solvents, it was shown that 1-methylpyrrolidin-2one and N,N-dimethylacetamide are promising solvents. 6 When studying the reaction and separation constituents, the question of the quantitative composition of the mixture (the amount of reagent, solvent, water) is discussed. This question is of fundamental importance since the reaction mixture contains a catalytic system, which, after separation from the target product, must be returned to the stage of chemical transformation.…”