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Measurements of physical and thermodynamic properties of products obtained through direct coal liquefaction
Author(s) -
Lauret A.,
Richon D.,
Re H.
Publication year - 1994
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4440180226
Subject(s) - hydrogen , boiling point , chemistry , thermodynamics , boiling , pyrolytic carbon , coal liquefaction , coal , flame ionization detector , liquefaction , cracking , analytical chemistry (journal) , pyrolysis , gas chromatography , chromatography , organic chemistry , physics
An apparatus has been especially designed to measure vapour‐liquid equilibria of high‐boiling‐point hydrogen compound mixtures up to 25 MPa and 673 K; the proposed study deals with equilibrium properties of hydrogen mixed with an oil produced by hydroliquefication of coal. The equilibrium cell, derived from a static technique with phase sampling, is well suited to reach thermodynamic equilibria, even with mixtures containing compounds of very different boiling temperatures but not affected by thermal cracking. Cell materials are hydrogen embrittlement resistant. Two sampling systems are used to sample both the liquid and vapour phases. Samples taken from the inside of the cell are sent directly into a carrier gas leading taking it to a chromatographic analysis assembly. Analysis of both hydrogen and oil components from each sample is a complex task requiring a very rigorous experimental procedure and the use of two types of chromatographic detectors, one thermal conductivity detector for hydrogen, and two flame ionization detectors for oil components. Two isotherms at 523 and 548 K have been studied for pressures, between 5 and 15 MPa and between 5 and 20 MPa, respectively, showing the influence of temperature and pressure on hydrogen‐oil equilibria.