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Dive into the research topics where Sunil K. Kesavan is active.

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Featured researches published by Sunil K. Kesavan.


Petroleum Science and Technology | 1989

SELECTIVE REMOVAL OF ORGANIC SULFUR FROM COAL BY PERCHLOROETHYLENE EXTRACTION

Sunggyu Lee; Sunil K. Kesavan; Byung Gwon Lee; Amit Ghosh; Conrad J. Kulik

ABSTRACT Desulfurization of coal involves the removal of both the inorganic and organic forms of sulfur. Several physical methods are available for the removal of inorganic sulfur which is normally represented by pyritic and sulfatic sulfur. Removal of organic sulfur requires the use of chemical cleaning methods. This paper presents the results of an organic sulfur removal technique which employs an organic solvent. This desulfurization technique is selective enough to reject organic sulfur without significantly reducing the calorific value of the treated coal. The sulfur containing organic species in the liquid product from the desulfurization procedure have been completely characterized using GC/MS techniques. These results provide further insights into the nature of the sulfur forms in the parent coal as well as the metamorphism of sulfur species in the coal, and the selective nature of the desulfurization process.


Fuel | 1989

Selective precombustion desulphurization of Ohio coals using supercritical fluids

Sunggyu Lee; Sunil K. Kesavan; Amit Ghosh; Kathy L. Fullerton

Abstract Desulphurization of coal involves the removal of both the inorganic and organic forms of sulphur. Several physical and a few chemical methods are available for the removal of inorganic sulphur. Removal of organic sulphur requires the use of chemical cleaning methods. This paper presents the results of a sulphur removal technique that employs supercritical fluids. The results obtained from the use of methanol-water mixtures as solvents are examined. The solvent composition in this desulphurization technique can be tailored to selectively reject sulphur without significantly reducing the calorific value of the treated coal. The sulphur-containing organic species in the liquid product from the desulphurization experiments have been characterized using wet chemical methods and g.c.-m.s. analysis.


Petroleum Science and Technology | 1988

Supercritical extraction of stuart oil shale

Sunil K. Kesavan; Amit Ghosh; Mark E. Polasky; Vetkav R. Parameswaran; Sunggyu Lee

This paper describes the recovery of oil from Stuart oil shale using a supercritical extraction technique employing carbon dioxide as solvent. This supercritical technique provides yields superior to comparable retorting techniques. The importance of extraction temperature, pressure, and time has been investigated. In addition, the chemical composition of the oil extracted from the shale is presented. Simulated distillation has been employed to assess the effect of extraction conditions on the quality of the shale oil extracted.


Archive: Engineering in Medicine 1971-1988 (vols 1-17) | 1985

Evaluation of Oral Water Irrigation Devices

Narender P. Reddy; Sunil K. Kesavan; Bruce R. Costarella

Water irrigation devices (WIDs) are widely used in homes and dental offices across the country for oral hygiene. There have been several reported cases of tissue damage with the use of these device...


Petroleum Science and Technology | 1992

Supercritical extraction of organosulfur from coal using acetone-water mixtures

Fouad O. Azzam; Kathy L. Fullerton; Sunil K. Kesavan; Sunggyu Lee

Abstract Binary mixtures of acetone and water at their supercritical conditions have been investigated for their ability to remove organic sulfur from high sulfur Midwestern coals. The reduction of organic sulfur from Ohio 5/6 and Indiana 5 coals has been as high as 61% (based on a BTU basis) The experiments have been carried out following a statistical experimental design and the optimal process conditions and discerning characteristics of the process have been identified. The solvent composition and the extraction conditions can be tailored in such a way as to selectively remove sulfur and further increase the calorific value of the treated coal.


Polymer Testing | 1986

An experimental technique to study the shock absorption characteristics of polymeric materials

S. Yazdani-Ardakani; Sunil K. Kesavan; M.L. Chu

Abstract An experimental technique designed to assess the shock absorption characteristics of polymeric insert materials used in shoes has been developed: a mechanical shaker subjects a vertically mounted human lower extremity specimen to impulsive forces, through an insert of the polymeric material to be tested. Accelerometers are used to monitor the attenuation of the impulse wave input. Results obtained for a viscoelastic polymer insert have been presented to illustrate the application of the testing procedure.


Petroleum Science and Technology | 1986

Stabilization of coal particle suspensions using coal liquid derived suspending media

Sunil K. Kesavan; D. L. Schruben

ABSTRACT A liquid we derived from coal, and a liquid produced from Exxon donor solvent (EDS) vacuum gas oil served to stabilize coal particle suspensions. In one case the liquids were used like commercial stabilization additives for coal-petroleum oil mixtures (COMs) with poorer but comparable results. In the other case the idea of using the coal liquid itself as the suspending medium (in place of petroleum oil) was considered, with encouraging results. Arguments suggest interparticle repulsion enhances the stability of coal particles in coal liquid derived suspending media.


Journal of Materials Science | 1987

Dynamic response testing of columnar composite structures subjected to impulsive loading

Saeed Yazdani-Ardakani; Sunil K. Kesavan; M.L. Chu

An experimental technique designed to study the dynamic response of columnar composite structures to impulsive loading has been developed. The technique uses a vibration shaker to subject a vertically mounted specimen to impulsive forces. Miniature accelerometers are used to monitor the dynamic response of the specimen. Results obtained from impulse tests with bone specimens have been presented to illustrate the testing technique.


Petroleum Science and Technology | 1986

FORMULATION OF STABLE COAL-METHANOL SUSPENSIONS USING COAL LIQUIDS

Sunil K. Kesavan

ABSTRACT Data from subsidence tests with coal–methanol and coal–coal 1iquid–methanol slurries are presented to suggest that coal liquids may serve to enhance the storage stability of coal–methanol slurry fuels. A two parameter system–the relative sediment height and the terminal sediment volume was used to characterize the compactness of coal sediments. The stability of coal–coal 1iquid–methanol slurries was found to depend upon the coal liquid content of the slurries. Addition of coal liquid to coal–methanol slurries caused coal particles to flocculate. These flocs form a loose, easily redispersed sediment bed which is very desirable from a practical point of view.


IEEE Transactions on Biomedical Engineering | 1986

Experimental Measurement of Impact Pressures Delivered by Oral Water Irrigation Devices

Sunil K. Kesavan; Narender P. Reddy; Saeed Yazdani-Ardakani

Water irrigation devices (WIDs) are widely used in homes and dental clinics across the country for oral hygiene. There have been several reported cases of tissue damage with the use of these devices. In the present investigation, two commercially available oral water irrigation devices were evaluated using engineering techniques. The impact thrusts delivered by these devices were measured at different control settings. Both of the tested commercial oral water irrigation devices were found to exert abnormally high thrust which could cause serious damage to the sulcular epithelium and the underlying tissues. These pressures are far in excess of the pressure intensity necessary to perform the cleaning action. Moreover, the existing designs using reciprocating pumps are unsafe and are potentially dangerous, particularly with small diameter tips.

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