Extractive Dividing Wall Column for Separating Azeotropic Systems: A Review

Czarnecki, Natalie J.; Owens, Scott; Eldridge, R. Bruce

doi:10.1021/acs.iecr.3c00302

Cited by 16 publications

(4 citation statements)

References 71 publications

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“…Epichlorohydrin is industrially produced from the reaction of hydrogen peroxide to propylene oxide (HPPO), as this process is not only short but also has the advantage of high atom utilization. , However, a large amount of wastewater containing propylene glycol monomethyl ether (PM) is discharged in the production, and this component should be recovered due to its wide application in coating, printing, dyeing, etc. − The recovery of PM could not only promote the economic benefits but also align with the principles of green chemistry. However, the traditional distillation technique fails to achieve this target due to the presence of the azeotropic mixture (PM/H 2 O); hence, special distillations should be attempted, including pressure swing distillation, − extractive distillation, − and azeotropic distillation. − However, these methods often suffer from significant disadvantages such as high facility investment, heavy energy load, and environmental pollution problems. For instance, the entrainer or extractant could not be fully recovered in the recycling operations, and a makeup flow was often used.…”

Section: Introductionmentioning

confidence: 99%

A Novel Internal Coupling Process of a T-type Zeolite Membrane in a Distillation Column to Separate the PM/H₂O Mixture

Fu,

Zheng,

Huang

et al. 2024

Ind. Eng. Chem. Res.

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The recovery and purification of propylene glycol monomethyl ether (PM) could significantly enhance the economic benefits of the hydrogen peroxide to propylene oxide (HPPO) reaction to produce epichlorohydrin. However, the conventional distillation technique fails to achieve this aim due to the presence of an azeotropic mixture. To address this issue, we proposed a novel coupling process to recycle the PM component, where the membrane unit was internally embedded in the column vessel to remove water before the distillate. This concept was further verified by a designed packed column operated in batch mode. By introducing a hollow fiber T-type zeolite membrane, the PM purity in the distillate was promoted by 1.0 wt % compared with the result in the blank test, suggesting that the membrane unit improved the separation effect. To further explore the synergistic effect of the membrane unit in the internal coupling process, the process simulation was established to optimize the operation parameters of internal coupling, including membrane area, coupling position, z, and feeding stage. The results indicated that the internal coupling could efficiently achieve the defined separation target, by significantly changing the vapor–liquid equilibrium profiles. By comparing with the results in external coupling, it was found that the internal coupling method yielded a higher energy efficiency, resulting in a reduction of nearly 26% in heating energy consumption and almost 60% in condensing energy load; however, this approach required a relatively larger membrane area. The above results indicated that the internal coupling was equivalent to the external couplings, and both techniques could be used to break the azeotropic limit for separation of the PM/H2O mixture.

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Section: Introductionmentioning

confidence: 99%

A Novel Internal Coupling Process of a T-type Zeolite Membrane in a Distillation Column to Separate the PM/H₂O Mixture

Fu,

Zheng,

Huang

et al. 2024

Ind. Eng. Chem. Res.

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“…Tsai et al 14 introduced a new method for the initial design of bioethanol dehydration combining process fluctuation, which differs from previous studies that ignored fluctuations, and determined the feasible operating range of the process by considering fluctuations, increasing the flexibility of operation, providing valuable insights into the industrial application of ED for bioethanol dehydration. Czarnecki et al 15 reviewed key aspects such as the design scheme of extraction and dividing wall column obtained by combining ED with denuder wall column, the selection process of entrainment, the simulation design method, and the control scheme. Cui et al 16 achieved high-purity ethyl acetate and isopropanol recovery by triple ED treatment of pharmaceutical wastewater containing ethyl acetate/isopropanol/water.…”

Section: Introductionmentioning

confidence: 99%

Mechanistic Analysis and Process Simulation of Ethyl Acetate-Ethanol Separation by Complex Solvent Extractive Distillation

Liu,

Yin,

Dai

et al. 2024

ACS Omega

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Developing high-performance solvents for extraction and optimizing process technologies is crucial for efficient extractive distillation (ED) separation of azeotrope mixtures. In this paper, computer-aided screening was used to study the ED of azeotrope mixtures in ethyl acetate and ethanol systems using organic solvent dimethyl sulfoxide (DMSO) and ionic liquid (IL) ([EMIM][Ac]). The structural relationship between the ILs and the azeotrope mixture was analyzed by σ-profile, molecular surface electrostatic potential, interaction energy, and separation gradient. Subsequently, process simulation was carried out using Aspen Plus software and global optimization was performed with genetic algorithm, which found that both traditional organic solvents and ILs have good separation effects. But considering the high volatility of organic solvents and low saturation vapor pressure of ILs, it is considered to combine them to further explore the cost and carbon emission advantages in extractive distillation separation. Compared with pure organic solvent and pure ILs separation processes, the TAC of the process using an IL-based mixed solvent process decreased by 5.11 and 21.98%, respectively. The carbon emissions of the mixed extractant process were slightly higher than those of the pure organic solvent process, but the addition of ILs made very little volatilization of organic solvents, saving a charge for extractant use. By improving the process, waste heat is effectively recovered, which can save most of the utility engineering costs, and compared with the previous process, the total alkali consumption and carbon dioxide emissions are reduced by 9.43 and 27.17%, respectively. This exploration provides a theoretical reference for the development application and industrial research of ED processes using IL-based mixed solvents.

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“…The separation of azeotropes is ubiquitous in raw-product refineries and solvent recovery in the chemical industry ( 1 – 4 ). The dewatering of organics (alcohol, acetonitrile, ethyl acetate, pyridine, etc.)…”

Section: Introductionmentioning

confidence: 99%

Adaptive healing of stress-induced dynamic cracks in a metal-organic framework membrane using nanoparticles

Wang,

Ban,

et al. 2024

Sci. Adv.

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Dewatering of aqueous azeotropes is crucial and pervasive in raw chemical refineries and solvent recovery in the chemical industry but is recognized as one of the most energy-intensive processes. Pervaporation using crystalline molecular sieve membranes provides an energy-efficient solution, but stress loads stemming from thermal and mechanical risks of pervaporation are most likely to cause membrane cracks, which greatly reduces reliability of membranes in real-world applications. Here, we propose adaptive healing of stress-induced dynamic cracks (AHSDC) in the membrane in a risk-responding manner before separation by using in situ–formed nanoparticles in the same chemical environment. These nanoparticles naturally filled in fissure gaps once cracks formed in the membrane, forming adaptive healing zones. Without loss of dewatering capacity, the separation durability of the membrane after AHSDC was improved by at least two orders of magnitude. The membrane also exhibited tolerance to industrial-grade azeotropes that epitomize industrial multisource nature and complexity.

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Extractive Dividing Wall Column for Separating Azeotropic Systems: A Review

Cited by 16 publications

References 71 publications

A Novel Internal Coupling Process of a T-type Zeolite Membrane in a Distillation Column to Separate the PM/H₂O Mixture

A Novel Internal Coupling Process of a T-type Zeolite Membrane in a Distillation Column to Separate the PM/H₂O Mixture

Mechanistic Analysis and Process Simulation of Ethyl Acetate-Ethanol Separation by Complex Solvent Extractive Distillation

Adaptive healing of stress-induced dynamic cracks in a metal-organic framework membrane using nanoparticles

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Extractive Dividing Wall Column for Separating Azeotropic Systems: A Review

Cited by 16 publications

References 71 publications

A Novel Internal Coupling Process of a T-type Zeolite Membrane in a Distillation Column to Separate the PM/H2O Mixture

A Novel Internal Coupling Process of a T-type Zeolite Membrane in a Distillation Column to Separate the PM/H2O Mixture

Mechanistic Analysis and Process Simulation of Ethyl Acetate-Ethanol Separation by Complex Solvent Extractive Distillation

Adaptive healing of stress-induced dynamic cracks in a metal-organic framework membrane using nanoparticles

Contact Info

Product

Resources

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A Novel Internal Coupling Process of a T-type Zeolite Membrane in a Distillation Column to Separate the PM/H₂O Mixture

A Novel Internal Coupling Process of a T-type Zeolite Membrane in a Distillation Column to Separate the PM/H₂O Mixture