Heat capacity of coal liquids

Mraw, Stephen C.; Heidman, J.L.; Hwang, Shuen Cheng; Tsonopoulos, Constantine

doi:10.1021/i200026a029

Cited by 13 publications

(5 citation statements)

References 6 publications

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“…Data Source. The fitting capability of the 25 selected functions was done using two distillation data sources: those previously reported in the literature − and data obtained in laboratories at the Mexican Institute of Petroleum and the University of Alberta. The selected samples include whole crude oils; vacuum gasoils; atmospheric and vacuum residua; atmospheric gasoils; light cycle oils (LCO); hydrotreated LCO; feeds of the fluid catalytic cracking (FCC) process; feeds; and products of mild thermal processing, vacuum residue hydrotreating, hydrotreating of bitumen-derived gasoils process, and hydrotreating of middle distillates.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Probability Distribution Functions for Fitting Distillation Curves of Petroleum

2007

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The fitting capability of 25 probability distribution functions for distillation data of petroleum fractions was analyzed in this work. Rankings of all the functions based on two different approaches were established after a statistical analysis of the fit of the functions with a data set of 137 distillation curves. In general, distribution functions with four parameters showed better fitting capability than those with three parameters. Two-parameter functions were not effective in fitting distillation data. The Weibull extreme, Kumaraswamy, and Weibull functions were found to be the best distribution functions for fitting distillation data considering their ranking and the required CPU time. These distribution functions exhibited the lowest Akaike information criterion and Bayesian information criterion average values, standard deviations lower than 1%, correlation coefficients higher than 0.999, and residuals randomly distributed without any tendency. The fitting capability of the best functions was validated with an independent set of distillation data, and the ranking was the same.

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Section: Methodsmentioning

confidence: 99%

Comparison of Probability Distribution Functions for Fitting Distillation Curves of Petroleum

2007

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“…Different techniques for determining enthalpy increments include direct measurement, integration of heat capacity as a function of temperature at constant pressure, and calculation from accurate density measurements as a function of temperature and pressure with ideal-gas enthalpies. Techniques have been developed for measurement of heat capacities using differential scanning calorimeters, but routine measurements with a precision better than 3% are rare (9) . For thermodynamic model development, excess enthalpies or enthalpies of mixing of binary and ternary systems are generally required.…”

Section: Ethylbenzene-quinoline Datamentioning

confidence: 99%

High Temperature High Pressure Thermodynamic Measurements for Coal Model Compounds

Chen

Kabadi²

2000

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“…Differential scanning calorimetry (DSC) has suggested that water is held in a tightly bound "unfreezable" form as well as in a bulk "freezable" form [6,7]. Another study, based on proton NMR examination of the water associated with a brown coal, reached similar conclusions [8].…”

Section: Introductionmentioning

confidence: 97%

A new model of coal-water interaction and relevance for dewatering

Suuberg¹

1991

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This project is concerned with a basic scientific question concerning the properties of coM-to what extent is the ability of coal to hold moisture a manifestation of the web-known ability of coal to swell, when exposed to good solvents? The question implies that the longheld belief that coal holds a significant portion of its moisture by classical capillary condensation processes, is possibly in error. This seems to be a very real possibility for low rank coals-i.e. lignites. To explore this hypothesis further requires an examination of the basic phenomena governing the swelling of coals in good solvents. This is the focus of the first part of this project. The possibility that coal holds a significant portion of its moisture by solvent swelling mechanisms leads to an interesting technical issue, lt is well known that simple drying of low rank coals at minemouth is ineffective because the process is reversible, to a significant degree. The economic advantages of pre-shipment drying have however dictated a search for "permanent" drying procedures. These have been developed by largely empirical means, and involve mild pyrolytic treatments of the coals in oil, steam or liquid water itself. The idea has always been to pyrolytically remove oxygen groups, which are assumed to be those that hold water most strongly by hydrogen bonding. The treatments have been designed to minimize tar formation and decrepitation of the particles, both highly undesirable. In relation to the present new hypothesis concerning water retention, it is likely that a sound approach to permanent drying would involve highly crosslinking the coal at mild drying conditions. The crosslinked coal could not swell sufficiently to hold much water, lt is identifying processes to achieve this goal, that constitute the objective of the second phase of this work.

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Heat capacity of coal liquids

Cited by 13 publications

References 6 publications

Comparison of Probability Distribution Functions for Fitting Distillation Curves of Petroleum

Comparison of Probability Distribution Functions for Fitting Distillation Curves of Petroleum

High Temperature High Pressure Thermodynamic Measurements for Coal Model Compounds

A new model of coal-water interaction and relevance for dewatering

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