Choice of extractive agents for separating benzene-perfluorobenzene biazeotropic mixture based on thermodynamic criterion

Sazonova, Aleksandra Yu.; Раева, В. М.; Chelyuskina, T. V.; Фролкова, А. К.

doi:10.1134/s0040579514020122

Cited by 14 publications

(3 citation statements)

References 10 publications

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“…The methodology proposed in this work has the advantage of neither using solvent extraction 9, which would lead to the production of a secondary phase, nor the addition of a separating agent capable of forming a new azeotrope with vaporization heat different from that of the ACN‐water mixture, as it occurs in extractive distillation 10.…”

Section: Resultsmentioning

confidence: 99%

“…The conventional distillation process is not viable for obtaining pure ACN due to the low driving force for this separation 9. Several unconventional methods for the recovery of ACN from a solution are reported in the literature, such as the combined method of extraction with solvent followed by batch distillation 9, 10, membrane separation 11, freezing phase separation 12, use of phase‐separating agents for liquid‐liquid separation 4, 13–17, etc., whose combination enhances the recovery yield.…”

Section: Introductionmentioning

confidence: 99%

“…The work of Sazonova and Raeva 10 demonstrated that ACN removal from the azeotrope with water by extractive distillation is the best available technique. In the present study, a binary solvent mixture, i.e., liquid chromatography residue, produced in the research laboratories of the Faculty of Pharmaceutical Sciences of the University of São Paulo (FCF/USP) was used as the matrix.…”

Section: Introductionmentioning

confidence: 99%

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Acetonitrile Recovery by Distillation Techniques Combined with Salting‐Out or Sugaring‐Out in Tandem

et al. 2021

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Acetonitrile recovery from a residual aqueous solution was performed by different techniques. Particularly, a residual acetonitrile‐water solution used in high‐performance liquid chromatography analyses at the School of Pharmaceutical Sciences of the University of São Paulo was investigated with the aim to identify the most feasible way to treat such a waste and recover acetonitrile within its dependencies. Three procedures were set up and tested, which consisted of different combinations of well‐known separation techniques, such as fractional distillation, cooling, salting‐out, and sugaring‐out. Cooling followed by distillation and subsequent addition of calcium chloride allowed to recover the highest amount of acetonitrile with a purity greater than 95 %.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Acetonitrile Recovery by Distillation Techniques Combined with Salting‐Out or Sugaring‐Out in Tandem

et al. 2021

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Separation of ternary mixtures by extractive distillation with 1,2-ethandiol and glycerol

Раева

Sazonova

2015

Chemical Engineering Research and Design

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Review of extractive distillation. Process design, operation, optimization and control

Gerbaud

Rodríguez-Donis

Hégely

et al. 2019

Chemical Engineering Research and Design

196

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Operation and control Extractive distillation processes enable the separation of non-ideal mixtures, including minimum or maximum boiling azeotropes and low relative volatility mixtures. Unlike azeotropic distillation, the entrainer fed at another location than the main mixture induces an extractive section within the column. A general feasibility criterion shows that intermediate and light entrainers and heterogeneous entrainers are suitable along common heavy entrainers. Entrainer selection rules rely upon selectivity ratios and residue curve map (rcm) topology including univolatility curves. For each type of entrainer, we define extractive separation classes that summarize feasibility regions, achievable products and entrainer-feed flow rate ratio limits. Case studies are listed as Supplementary materials. Depending on the separation class, a direct or an indirect split column configuration will allow to obtain a distillate product or a bottom product, which is usually a saddle point of rcm. Batch and continuous process operations differ mainly by the feasible ranges for the entrainer-feed flow rate ratio and reflux ratio. The batch process is feasible under total reflux and can orient the still path by changing the reflux policy. Optimisation of the extractive process must systematically consider the extractive column along with the entrainer regeneration column that requires energy and may limit the product purity in the extractive column through recycle. For the sake of reducing the energy cost and the total cost, pressure change can be beneficial as it affects volatility, or new process structures can be devised, namely heat integrated extractive distillation, extractive divided wall column or processes with preconcentrator.

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Choice of extractive agents for separating benzene-perfluorobenzene biazeotropic mixture based on thermodynamic criterion

Cited by 14 publications

References 10 publications

Acetonitrile Recovery by Distillation Techniques Combined with Salting‐Out or Sugaring‐Out in Tandem

Acetonitrile Recovery by Distillation Techniques Combined with Salting‐Out or Sugaring‐Out in Tandem

Separation of ternary mixtures by extractive distillation with 1,2-ethandiol and glycerol

Review of extractive distillation. Process design, operation, optimization and control

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