Fractionation Research Inc.

Stillwater, OK, United States

Fractionation Research Inc.

Stillwater, OK, United States
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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.


Cai T.J.,Fractionation Research Inc. | Resetarits M.R.,Fractionation Research Inc.
Chinese Journal of Chemical Engineering | Year: 2011

Pressure drops are of major importance for distillation/absorption columns. This paper mainly discusses how to correctly measure, interpret and use pressure drop data. The possible causes of incorrect pressure drop measurements are studied including the effects of pressure tap dimensions, locations, and vapor condensation etc. The effect of the static head of vapor on the pressure drop data and column pressures is evaluated. Variations of sectional pressure drops along the column are investigated based on the experimental data obtained from commercial size distillation columns at Fractionation Research, Inc. (FRI). For a packed column, it is found that the spacing between the liquid distributor and the top of the bed affects the overall pressure drop measurements, which is confirmed by a fundamental fluid dynamics analysis. © 2011 Chemical Industry and Engineering Society of China (CIESC) and Chemical Industry Press (CIP).


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.


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.


Cai T.,Fractionation Research Inc. | Resetarits M.,Fractionation Research Inc. | Ogundeji A.Y.,Fractionation Research Inc.
Liaison Functions 2014 - Core Programming Area at the 2014 AIChE Spring Meeting and 10th Global Congress on Process Safety | Year: 2014

Distillation columns are essential to the chemical processing industries. They need to be properly designed and operated. Column internals, such as trays and packings, are essential to column performance. If column internals malfunction, the entire plant may suffer. Among column internal, trayed columns are widely used in distillation and absorption applications. This presentation will discuss the ranges of the liquid and vapor loads that a trayed column can handle. It will review the systems where trayed columns are particularly applicable. A brief history of trays and trayed columns will be presented. New generations of high performance trays, including augmented crossflow, counter current flow and cocurrent flow trays, will be discussed. The performance differences between trays and packings will be summarized. Column designs that provide high energy efficiencies will be briefly discussed. Extensive video footage of tray operations will be shown, from commercial size columns with various distillation systems ranging from deep vacuum to high pressure. © American Institute of Chemical Engineers. All rights reserved.


Resetarits M.,Fractionation Research Inc. | Ogundeji A.Y.,Fractionation Research Inc. | Cai T.J.,Fractionation Research Inc.
Liaison Functions 2014 - Core Programming Area at the 2014 AIChE Spring Meeting and 10th Global Congress on Process Safety | Year: 2014

What is the best way to remove C6, C7 and C8 compounds from a feed stream containing C6, C7 and C8 compounds? How do you take a lubricating oil and remove certain compounds and improve its viscosity index (so that its viscosity does not change excessively with the oil's temperature)? What is propane deasphalting? The answers to all of these questions is "liquid extraction processes." What technology was supported and funded by the actor Kevin Costner to help clean up the large 2010 Gulf of Mexico oil spill? What are Karr reciprocating plate columns, Oldshue-Rushton contactors and Podbielniak centrifuges? What the heck is a Graesser Raining Bucket? The answer to all of these questions is "liquid extraction equipment." Imagine heavy and light fluids flowing vertically past each other with only a very small density difference. Imagine rotating equipment that works better without rotating. Liquid extraction is different - very different. There are very few experts. © American Institute of Chemical Engineers. All rights reserved.


Resetarits M.R.,Fractionation Research Inc. | Vennavelli A.N.,Fractionation Research Inc. | Ogundeji A.Y.,Fractionation Research Inc.
Liaison Functions 2014 - Core Programming Area at the 2014 AIChE Spring Meeting and 10th Global Congress on Process Safety | Year: 2014

In the chemicals processing industry, distillation is the most commonly employed separation technique. Different chemicals have different boiling points. After a simple mixture flash, the vapor product contains more light compounds than does the liquid product. A series of flash vessels can be employed to effect purifications of the light and heavy compounds. Similarly, a series of equilibrium stages arranged vertically in a distillation column can effect simple and difficult separations. Column operating pressure is an important variable as is column pressure drop. A reboiler is required at the bottom of a column to boil the heavy liquid. A condenser is required at the top of a column to condense the light vapor and create a reflux stream that flows down the column and cleans the upflowing vapor. When the reflux flow rate is divided by the top (liquid) product rate, the resultant number is called the reflux ratio. Generally, reflux requirements are a function of the relative volatilities of the light and heavy components. Pumps, pipes, valves, meters, thermocouples and other instrumentation are all essential parts of a distillation unit. Batch, azeotropic and extractive distillations are also employed industrially. © American Institute of Chemical Engineers. All rights reserved.


Chambers S.,Fractionation Research Inc. | Vennavelli A.N.,Fractionation Research Inc.
Liaison Functions 2014 - Core Programming Area at the 2014 AIChE Spring Meeting and 10th Global Congress on Process Safety | Year: 2014

Structured packings used in industrial practice can be broadly classified into three generations: wire gauze, standard, and high capacity corrugated sheet metal. Standard structured packings were a popular choice in the industry for many years. Newer high capacity structured packings, which comprise either "half-S" or "full-S" crimp angle shapes, can operate at much higher load points or maximum useful capacities (MUC's), and considerably lower pressure drops than standard structured packings. Structured packings are favored in high vapor rate, low liquid rate distillation services and in absorption. They are particularly advantageous in vacuum columns, where low pressure drops are sometimes critical. For example, in Ethylbenzene-Styrene monomer columns, low pressure drops yield low liquid temperatures and, consequently, reduced renegade polymerization. In this paper, structured packing physical characteristics, installation, and applications are discussed. In addition, basic performance characteristics, such as HETP, pressure drop, and capacity, and liquid distribution quality are reviewed. A 20-minute video was prepared by FRI to illustrate the basics of structured packings. © American Institute of Chemical Engineers. All rights reserved.

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