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Stillwater, OK, United States

Bouck D.,Fractionation Research Inc.
Chemical Engineering Progress | Year: 2014

Doug Bouck from Separation Solutions, Ltd., provides guidance on how to avoid problems faced in undertaking projects aimed at improving distillation column. He discusses a number of significant issues that are faced in undertaking such projects. These issues include incorrect estimation of project economics, failure to account for long-term capacity needs, changes in engineering personnel, use of incorrect data in the process simulation model, and incorrect interpretation of the simulation model output. It is important to establish the correct basis for product values, including whether the product's value goes through cycles when making efforts to justify improving the recovery of a product. It is also important to determine whether the incremental effects of a distillation column improvement will have any significant effect on the product's value and the project's economics.

Tamhankar Y.S.,Oklahoma State University | Whiteley J.R.,Oklahoma State University | Resetarits M.R.,Fractionation Research Inc. | Aichele C.P.,Oklahoma State University
Atomization and Sprays | Year: 2014

Spray absorption efficiency is a function of the surface area of drops, interaction between the drops, oscillations, coalescence, and breakup. Knowledge of drop size distributions is critical for estimating the total surface area of drops and hence the rate of absorption. This paper illustrates a unique facility designed to measure drop size and velocity distributions using a phase Doppler interferometer (PDI) through dense wall flow. A novel eyepiece insert facilitated PDI measurements through liquid films running down the inner wall of the glass chamber. Measurement data with water as the test fluid with and without countercurrent gas flow is presented. © 2014 by Begell House, Inc.

Vennavelli A.N.,Fractionation Research Inc. | Whiteley J.R.,Oklahoma State University | Resetarits M.R.,Fractionation Research Inc.
Industrial and Engineering Chemistry Research | Year: 2012

The two phases on distillation trays can function in several different regimes depending on the physical properties of the system and the liquid-to-vapor ratio. Predicting the fraction of the vapor transported as jets, or fraction jetting, on a tray operating in the mixed-froth regime can bridge froth and spray regime models, explain the gradual changes in tray efficiency during the froth-spray transition, and eliminate the need to predict the froth-spray transition point when separate froth and spray regime models are used. Fraction jetting models will also facilitate multiregime models, such as the Syeda et al. (Chem. Eng. Res. Dev.2007, 85, 269-277) sieve tray efficiency model, that are valid for both froth and spray regimes. Current fraction jetting models are empirical and developed from limited data. In this paper, the concept of fraction jetting on a sieve tray is discussed and a new semiempirical model is presented. The fraction jetting model was developed using the existing data of Raper et al. (Chem. Eng. Sci.1982, 37, 501-506) and no new data were generated. Furthermore, the applicability of the fraction jetting model to tray efficiency models that incorporate jetting is demonstrated using the Syeda et al. sieve tray efficiency model. © 2012 American Chemical Society.

Vennavelli A.N.,Fractionation Research Inc. | Whiteley J.R.,Oklahoma State University | Resetarits M.R.,Fractionation Research Inc.
Chemical Engineering Research and Design | Year: 2014

Existing literature models for predicting the mass transfer efficiencies of binary hydrocarbon, distillation columns employing moving valve trays are evaluated. Only four models for predicting valve tray efficiencies exist in the open literature. All of these models use data from valve trays. The last theoretical model was published in 1972, 42 years ago. By comparison, sieve tray efficiency models are numerous and recent. Sieve tray models were developed from large databases. There are no valve tray equivalents to the fundamental mechanistic models available for sieve trays. Despite the differences between valve and sieve trays, many of the phenomena on sieve and valve trays are similar. Consequently, sieve tray models can be employed to provide estimates for valve trays. In this work, using public FRI data on round moving valves, the performance of the Chen and Chuang sieve tray mechanistic model is compared to the performance of four valve tray models. It appears that, in the absence of fundamental (and qualified) valve tray models, the sieve tray models present a potential alternative for valve tray efficiency predictions. © 2014 The Institution of Chemical Engineers.

Vennavelli A.N.,Fractionation Research Inc. | Resetarits M.R.,Fractionation Research Inc.
Proceedings of the American Control Conference | Year: 2013

Online real-time Steady and Transient State identification is demonstrated for a multi-variable commercial scale process by monitoring seven key variables. The results are consistent with visual interpretation and are used to guide operators in managing sampling and transitions within a sequence of trial conditions. © 2013 AACC American Automatic Control Council.

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