Design Method for Distillation Columns Filled with Metallic, Ceramic, or Plastic Structured Packings

Gualito, J.J.; Cerino, F.J.; Cárdenas, J. Carlos; Rocha, J. A.

doi:10.1021/ie960625z

Cited by 82 publications

(75 citation statements)

References 7 publications

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“…Second, as the bottom and top compositions depend on the packed depth, we should expect to see that hHETPi is packed depth dependent. Indeed, this is oftentimes observed, [20][21][22] and the effect is sometimes even included in packed-column mass-transfer correlations. 4,23,24 Figure 3 shows how C y and C x vary with the mole fraction of the light component for a fictitious binary mixture with a ¼ 1.2 and the bottom composition fixed at x b ¼ 0.05.…”

Section: The Average Hetpmentioning

confidence: 99%

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New mass‐transfer correlations for packed towers

2011

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in Wiley Online Library (wileyonlinelibrary.com).Rate-based calculations for trayed and packed columns offer process engineers a more rigorous and reliable basis for assessing column performance than the traditional equilibrium-stage approach, especially for multicomponent separations. Although the mathematics, thermodynamics, and transport-related physics upon which nonequilibrium separations theory is founded are generally true, it is also true that rate-based simulations today suffer from a serious weakness-they are ultimately tied to underlying equipment performance correlations with questionable predictive capability. In the case of packed columns operated countercurrently, correlations are required for the masstransfer coefficients, k x and k y , for the specific area participating in mass transfer, a m , for the two-phase pressure drop, (Dp/Z) 2/ , and for the flood capacity of the column. In particular, it is generally well known that packing mass-transfer correlations available in the public domain are unreliable when they are applied to chemical systems and column operating conditions outside of those used to develop the correlations in the first place. For that reason, we undertake the development of dependable, dimensionally consistent, correlating expressions for the mass-transfer-related quantities k x , k y , and a m for metal Pall rings, metal IMTP, sheet metal structured packings of the MELLAPAK type, and metal gauze structured packings in the X configuration, using a new data fitting procedure. We demonstrate the superior performance of these correlations for a wide range of chemical systems and column operating conditions, including distillations as well as acid gas capture with amines. Further, we show that these new correlations lead to predictions for the relative interfacial area participating in mass transfer that can be greatly in excess of the geometrical surface area of the packing itself.

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Section: The Average Hetpmentioning

confidence: 99%

“…[9][10][11][12][20][21][22] The data for the various packing families were individually analyzed using the methodology outlined above. Several ad hoc limiting conditions were placed upon the power-law exponents in the fits.…”

Section: Data Sources and Data Correlationmentioning

confidence: 99%

New mass‐transfer correlations for packed towers

2011

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“…The gas-and liquid-phase mass transfer coefficients, k G and k L , can be calculated by using the proposed model of Rocha and co-workers [13,14]:…”

Section: Interphase Mass Transfer Equationsmentioning

confidence: 99%

CFD Simulation of Mass Transfer Efficiency and Pressure Drop in a Structured Packed Distillation Column

et al. 2007

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The pressure drop and mass transfer efficiency for two-phase flow in a structured packed column were simulated using a commercial CFD package, CFX version 10. The distillation of the methanol/isopropanol system was carried out in a 0.073 m diameter column, with an element composed of a ceramic structured packing and 0.053 m in height. The Height Equivalent to Theoretical Plate (HETP) value varied from 0.106-0.146 m. Pressure drop experiments were measured with an air/water system. The pressure drops at the flooding and loading points were ca. 173 and 580 Pa/m of packing, respectively. HETPs and pressure drops calculated from the Computational Fluid Dynamics (CFD) model were compared to their experimental counterparts. The average relative error between CFD predictions and the experimental data for the prediction of dry pressure drop, irrigated pressure drop and mass transfer efficiency are 20.3 %, 23 % and 9.15 %, respectively. In all cases, the CFD predictions show a good agreement with the experimental data, indicating that CFD is a reliable, cost saving and suitable technique for the design and optimization of separation processes.

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“…3 is a parity plot where experimental and calculated HETP are compared, including data of organic and aqueous mixtures.Themajorityof datahasa deviationsmallerthan25% The chosen value for 9 would not be suitable for nonmetallic surfaces. It is known that the packing material influences efficiency: HETP with a metal packing can be half that of a polypropylene packing [1]. Hence, 9 > 5.40 for plastic packing.…”

Section: Developing a New Methods For Sheet Structured Packingsmentioning

confidence: 99%

“…Therefore, their application involves calculations of the effective interfacial area and resistances in both phases. This implies dealing with several equations and a lot of properties [1].…”

Section: Introductionmentioning

confidence: 99%

A Shortcut Method for the Estimation of Structured Packings HEPT in Distillation

Carillo

Martin

Roselló³

2000

Chem. Eng. Technol.

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A shortcut method to calculate HETP for metal structured packings is proposed. The method is a simplification and extension of Lockett's equation for sheet packings, based on the Bravo, Rocha and Fair model. It is applicable at vacuum or pressure distillation of organic or aqueous mixtures in columns of sheet and gauze packings. The necessary variables are specific surface of packing, density of vapor and liquid and flow (when gauze packings are being considered). No estimation of hydrodynamic conditions is necessary.

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Design Method for Distillation Columns Filled with Metallic, Ceramic, or Plastic Structured Packings

Cited by 82 publications

References 7 publications

New mass‐transfer correlations for packed towers

New mass‐transfer correlations for packed towers

CFD Simulation of Mass Transfer Efficiency and Pressure Drop in a Structured Packed Distillation Column

A Shortcut Method for the Estimation of Structured Packings HEPT in Distillation

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