Experimental isobaric vapor–liquid equilibrium for ternary system of sec -butyl alcohol + sec -butyl acetate + N , N -dimethyl formamide at 101.3 kPa

Experimental isobaric vapor liquid equilibrium for the ternary system of sec-butyl alcohol+sec-butyl acetate+dimethyl sulfoxide at 101.3kPa

“…The details of the vapor-liquid equilibrium still were described by Yuan et al [5] and Li et al [6]. The experimental procedure was described in our previous work [1,2,7]. In this process, both the vapor and the liquid phases were continuously circulating to provide intimate contact of the two phases.…”

“…Extractive distillation is a practical way of separating the difficult separated mixture, in which extractive agent is added to alter the vapor liquid equilibrium (VLE) of the binary system sec-butyl alcohol and sec-butyl acetate and make the separation feasible. N,N-dimethyl formamide and N,N-dimethyl acetamide were proved to be promising solvent in separation of sec-butyl alcohol and sec-butyl acetate mixture by extractive distillation in our previous work [1,2]. Dimethyl sulfoxide (DMSO) is also indicated as a potential extractive agent for the separation of the discussed binary mixture [1,3].…”

“…N,N-dimethyl formamide and N,N-dimethyl acetamide were proved to be promising solvent in separation of sec-butyl alcohol and sec-butyl acetate mixture by extractive distillation in our previous work [1,2]. Dimethyl sulfoxide (DMSO) is also indicated as a potential extractive agent for the separation of the discussed binary mixture [1,3]. So far, only the isobaric VLE data of sec-butyl alcohol (1) + sec-butyl acetate (2) can be found in the open literature [4].…”

Experimental isobaric (vapor + liquid) equilibrium data for the binary system N , N -dimethyl formamide + dimethyl sulfoxide and the quaternary system sec -butyl alcohol + sec -butyl acetate + N , N -dimethyl formamide + dimethyl sulfoxide at 101.3 kPa

“…Recently, a novel method of producing sec-butyl alcohol by transesterifying sec-butyl acetate with alcohols was exploited by some researchers, which is superior to traditional method by the hydration of butylenes. In this new process, sec-butyl alcohol and sec-butyl acetate form a "pseudo-azeotrope", in which the vapor and liquid composition is so close that it should be ignored nearly [5]. Extractive distillation as a special distillation is suitable to separate this type of systems.…”

“…In our previous work, DMF (3) and DMSO (4) were certified to be effective extractive solvents for separation of sec-butyl alcohol (1) and sec-butyl acetate (2) and DMSO performed better than DMF [5,6]. But the boiling point of DMSO is so high that it is likely to decompose when recovering extractive agent by distillation at 1 atm and even can cause explosion.…”