F. B. Hill

Bio: F. B. Hill is an academic researcher from Brookhaven National Laboratory. The author has contributed to research in topics: Pressure swing adsorption & Mixing (physics). The author has an hindex of 12, co-authored 22 publications receiving 469 citations.

Development of a technique for measurement of biogenic sulfur emission fluxes

Abstract: Atmospheric sulfur compounds of biogenic origin are thought to constitute a significant fraction of the atmospheric sulfur burden. Determination of fluxes of these compounds into the atmosphere is desirable in order to permit accurate assessment of the relative roles of anthropogenic and biogenic sources in contributing to such phenomena as the atmospheric sulfate burden and acidity in precipitation among others. In the present paper a number of steps in the development of an emission flux measurement technique for biogenic sulfur compounds are described and initial results of use of the technique in a Long Island salt marsh are presented. Experimental fluxes are compared to estimates of biogenic fluxes derived from global sulfur budgets and from a simple mass transfer model. Comparison is also made with anthropogenic emissions expressed as fluxes. Further steps in the development of the technique are suggested.

A technique for measurement of biogenic sulfur emission fluxes

Abstract: Atmospheric sulfur compounds of biogenic origin are thought to constitute a significant fraction of the atmospheric sulfur burden. Determination of fluxes of these compounds into the atmosphere is desirable in order to permit accurate assessment of the relative roles of anthropogenic and biogenic sources in contributing to such phenomena as the atmospheric sulfate burden and acidity in precipitation. In the present paper an emission flux measurement technique for biogenic sulfur compounds is described, and initial resuits of the use of the technique in a Long Island salt marsh are presented. These first known measurements of biogenic fluxes are compared to estimates of biogenic fluxes derived from global sulfur budgets and from calculations based on a simple mass transfer model. Comparison is also made with anthropogenic emission rates expressed as fluxes. Further steps in the development of the technique are suggested.

Separation of helium‐methane mixtures by pressure swing adsorption

Abstract: The separation of mixtures of helium and methane using a single column of activated carbon in a pressure swing adsorption process was studied experimentally. Process performace was predicted with an average error of 10% or less by a local-equilibrium well-stirred cell model in which dead volumes at the feed and product ends of the column were accounted for. Systematic differences between experiment and model were ascribed to omission from the model of flow resistance and heat release.

Pressure swing adsorption

Abstract: A pressure swing adsorption cycle comprised of blowdown, purge, pressurization, feed, pressure equalization and rinse steps provided recovery from an atmospheric air feed, essentially dry and free of carbon dioxide, of a high yield of high purity nitrogen gas and a high yield of a product gas rich in oxygen as well as recovery of a residual feed byproduct gas for recycle with the air feed.

On the Mathematical Modeling of Polymerization Reactors

Abstract: As commercially produced polymers become more of a commodity product, rather than a specialty product, there is a growing need for a more detailed understanding of the phenomena taking place in the polymer reactor. One quantitative form of this process understanding is the mathematical model, which can represent the detailed behavior of a polymer reactor. The mathematical model is an invaluable tool for developing the optimal design and optimal control system for these reactors.

A review of mathematical modeling of fixed-bed columns for carbon dioxide adsorption

Abstract: a b s t r a c t Carbon dioxide emissions must be stabilized to mitigate the unfettered release of greenhouse gases into the atmosphere. The removal of carbon dioxide from flue gases, an important first step in addressing the problem of CO2 emissions, can be achieved through adsorption separation technologies. In most adsorption processes, the adsorbent is in contact with fluid in a fixed bed. Fixed-bed column mathematical models are required to predict the performance of the adsorptive separation of carbon dioxide for optimizing design and operating conditions. A comprehensive mathematical model consists of coupled partial differential equations distributed over time and space that describe material, energy, and the momentum balances together with transport rates and equilibrium equations. Due to the complexities associated with the solution of a coupled stiff partial differential equation system, the use of accurate and efficient simplified models is desirable to decrease the required computational time. The simplified model is primarily established based on the description of mass transfer within adsorption systems. This paper presents a review of efforts over the last three decades toward mathematical modeling of the fixed-bed adsorption of carbon dioxide. The nature of various gas–solid equilibrium relationships as well as different descriptions of the mass transfer mechanisms within the adsorbent particle are reviewed. In addition to mass transfer, other aspects of adsorption in a fixed bed, such as heat and momentum transfer, are also studied. Both single- and multi-component CO2 adsorption systems are discussed in the review. © 2013 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Advances in Pressure Swing Adsorption for Gas Separation

Abstract: Pressure swing adsorption (PSA) is a well-established gas separation technique in air separation, gas drying, and hydrogen purification separation. Recently, PSA technology has been applied in other areas like methane purification from natural and biogas and has a tremendous potential to expand its utilization. It is known that the adsorbent material employed in a PSA process is extremely important in defining its properties, but it has also been demonstrated that process engineering can improve the performance of PSA units significantly. This paper aims to provide an overview of the fundamentals of PSA process while focusing specifically on different innovative engineering approaches that contributed to continuous improvement of PSA performance.