Entrainer selection for separating tetrahydrofuran/water azeotropic mixture by extractive distillation

Separation of methyl acetate+methanol azeotropic mixture using ionic liquids as entrainers

“…Comparison of VLE data for the binary system of methyl acetate (1) + methanol (2). ▽ ■, this work; , from Ref [5]; ○, from Ref [6]; solid line, correlated using the NRTL model.…”

“…Extractive distillation is the most common technique for the separation of azeotropic or close-boiling mixtures. It is evident that the selection of a suitable entrainer is crucial in extractive distillation [2]. Traditional entrainers such as organic solvents [3] or inorganic salts [4][5][6][7] have been employed in separating the mixture of methyl acetate and methanol, but they often make the process complicated, long and huge emerge consumption.…”

Production of tetrahydrofuran by dehydration of 1,4-butanediol using Amberlyst-15: Batch kinetics and batch reactive distillation

“…The catalyst has an upper temperature limit of 120 C (393 K) and also the boiling points of the components vary over a wide range (66 C (339 K) for THF, 100 C (373 K) for water and 230 C (503 K) for BD) but there is present an aqueous homogeneous azeotrope (64 C (337 K) with 93.3 mass% THF) [23] which can be used for this purpose thus keeping the catalyst always active.…”

“…Two Chinese journal articles refer this process using RD [18,19]. Since THF forms azeotrope with water, the dehydration of THF-water mixture is worked out by several researchers [20][21][22][23]. But none of these articles provide useful information for utilizing RD for manufacture of THF except Liu and Xiao [18] and Liu et al [19] of which not much information is available in the open literature.…”

Separation of acetone and methanol azeotropic system using ionic liquid as entrainer

“…Thus, the selection of optimal entrainer is a significant step. Organic solvents [1], solid salts [2] and hyper-branched polymers [3] as traditional entrainers have been investigated before. However, the traditional entrainer comprises some disadvantages such as solvent loss, highly corrosive, difficulty in recycling, which has been a handicap for further application of extractive distillation.…”