(Liquid+liquid) equilibria of {heptane+xylene+N-formylmorpholine} ternary system

Chen, DongChu; Ye, Hongqi; Wu, Hao

doi:10.1016/j.jct.2007.05.001

Cited by 16 publications

(9 citation statements)

References 13 publications

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“…The main solvents reported in the literature for aliphatic–aromatic liquid–liquid extraction, which have also been used in industrial separations, are sulfolane − and glycols, ,,− but many compounds have been tested for application in aliphatic–aromatic separations, including dimethyl sulfoxide, , ethylene and propylene carbonate, ,,− N -methylpyrrolidone, − N -formylmorpholine, ,,− and dimethylformamide, among others. The ternary aliphatic + aromatic + solvent systems, with compositional analysis, distribution factors, and selectivities, are detailed in each study, which is useful for performance comparisons among different compound combinations.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Ionic Liquids to Conventional Organic Solvents for Extraction of Aromatics from Aliphatics

2016

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Commonly used solvents for separation of aromatics from aliphatics using liquid−liquid extraction are reviewed in terms of their physical properties and separation performance. The experimental liquid− liquid measurements for conventional solvents are contrasted with the phase behavior when using an ionic liquid as the extracting component. For comparison purposes, ternary systems of heptane + toluene + extraction solvent are used as representative mixtures, where sulfolane is the main organic extraction solvent discussed. Since ionic liquid properties are drastically changed by changing the anion, comparisons are performed for 1ethyl-3-methylimidazolium based ionic liquids using different anions. Ionic liquids containing cyano-substituted and bis(trifluoromethylsulfonyl)imide anions provide good selectivities and distribution ratios. On the basis of the phase behavior and capacities, as well as their relatively low viscosities, they appear to be competitive alternatives to organic solvents.

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Section: Introductionmentioning

confidence: 99%

Comparison of Ionic Liquids to Conventional Organic Solvents for Extraction of Aromatics from Aliphatics

2016

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“…The NRTL equation was used to model the liquid phases together with the Redlich–Kwong equation of state for the vapor phase. The NRTL model is able to successfully represent deviations at low pressure (LP) with numerous studies − demonstrating the effectiveness of its representation of ternary phase equilibrium measurements consisting of aliphatic–aromatic solvent mixtures. The binary interaction parameters are automatically extracted from APV100 VLE-LIT and APV100 LLE-ASPEN databanks.…”

Section: Process Economicsmentioning

confidence: 99%

“…Since the early 1960s, the sulfolane process became more commonly used due to the observation that the solvent (sulfolane − , ) demonstrated improved solvent characteristics. Other organic chemicals were then studied in the following decades as potential solvents such as 1-methylpyrrolidin-2-one − (NMP), morpholine-4-carbaldehyde − (NFM), N , N -dimethylmethanamide (DMF), dimethyl sulfoxide (DMSO), and propylene carbonate …”

Section: Introductionmentioning

confidence: 99%

Identification and Screening of Potential Organic Solvents for the Liquid–Liquid Extraction of Aromatics

Brijmohan

Moodley

Narasigadu

2021

Org. Process Res. Dev.

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There is increasing focus on the replacement of commonly used solvents in the liquid−liquid extraction of aromatics with solvents that result in improved process economics as well as reduced risk in terms of health, safety, and environment. In this work, a selection of organic chemicals are proposed for further study as replacement solvents that meet the technological requirements for the process of aromatics extraction from alkanes and have not been conventionally considered previously for this application. There were 52,654 organic chemicals screened with the use of a search algorithm based on the process requirements in terms of physical properties, capacity, selectivity, and performance index. Nine organic chemicals were identified (not being previously considered) that met all the criteria imposed by the search algorithm. A risk assessment further screened the identified chemicals, filtering out the potential solvents with adverse impacts on health, safety, and environment. Process designs were developed with the use of ASPEN plus in order to ascertain the effects of solvent choice on process economics via the use of total annual costs. The screening process in this work produced significant insights due to its holistic approach. The incorporation of factors such as solvent price, solvent loss, utilities, capital costs, health, and environmental impact showed that several of the solvents identified may be sustainable and cost-effective alternatives to conventionally used solvents. This highlights the need for a robust and broad perspective in considering the impact of solvent choice.

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“…The search for solvents is ongoing and considerable research efforts have been made to identify and study alternatives to conventional solvents. Liquid–liquid equilibrium (LLE) data have been published for combinations of alkanes, aromatics, and solvents such as sulfolane, − tetraethylene glycol, 1-methylpyrrolidin-2-one (NMP), − morpholine-4-carbaldehyde (NFM), − N , N -dimethylmethanamide (DMF), and dimethyl sulfoxide (DMSO) . The motivations behind searching for alternative solvents include reduced risks to health, safety, and the environment, as well as improving capital and operating costs.…”

Section: Introductionmentioning

confidence: 99%

Ternary Liquid–Liquid Equilibrium Data for the n-Heptane + Toluene + (Butane-1,4-diol or Glycerol) Systems at 298.2, 313.2, and 333.2 K and 0.1 MPa

2022

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Liquid−liquid equilibrium (LLE) phase compositions (tie-line data) were experimentally measured and thermodynamically modeled for the systems nheptane + toluene + (butane-1,4-diol or glycerol) at 298.2, 313.2, and 333.2 K and 0.1 MPa. The direct analytical method was used to obtain the LLE data using a doublewalled glass cell. The phase equilibrium samples were quantitatively analyzed using gas chromatography. The ternary systems were successfully correlated using the NRTL and UNIQUAC thermodynamic models. The effectiveness of using butane-1,4-diol or glycerol as an alternative solvent to extract toluene from alkanes was evaluated by determining selectivity and solvent capacity. All systems studied were found to demonstrate type II ternary LLE behavior. The selectivity for the solvents studied was found to be comparable or superior to conventional solvents, but solvent capacities were poor, suggesting that the use of a cosolvent might be required to reduce solvent-to-feed ratios.

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(Liquid+liquid) equilibria of {heptane+xylene+N-formylmorpholine} ternary system

Cited by 16 publications

References 13 publications

Comparison of Ionic Liquids to Conventional Organic Solvents for Extraction of Aromatics from Aliphatics

Comparison of Ionic Liquids to Conventional Organic Solvents for Extraction of Aromatics from Aliphatics

Identification and Screening of Potential Organic Solvents for the Liquid–Liquid Extraction of Aromatics

Ternary Liquid–Liquid Equilibrium Data for the n-Heptane + Toluene + (Butane-1,4-diol or Glycerol) Systems at 298.2, 313.2, and 333.2 K and 0.1 MPa

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