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Pressure‐temperature critical loci for multicomponent hydrocarbon mixtures
Author(s) -
Grieves Robert B.
Publication year - 1963
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450410409
Subject(s) - propane , butane , pentane , thermodynamics , ternary operation , mole fraction , constant (computer programming) , alkane , chemistry , component (thermodynamics) , methane , ternary numeral system , binary number , hydrocarbon , organic chemistry , physics , mathematics , phase (matter) , catalysis , computer science , programming language , arithmetic
Based upon data reported in the literature, pressure‐temperature critical loci are presented for the methane‐ethane‐n‐butane and ethane‐n‐butane n‐pentane systems. Loci are drawn having fixed values of a composition parameter including the two heavy components of the system. The curves closely resemble the bounding binary loci. Based upon accurate methods of calculating critical temperatures (0.5%) and critical pressures (1.5%), critical loci are presented for the ethane‐propane‐n‐butane‐n‐pentane system. Two families of curves are generated, each family corresponding to a fixed value of the composition parameter including the heaviest components. Each curve corresponds to a constant ratio of propane, n‐butane, and n‐pentane (and to fixed values of two composition parameters). Relations are noted between binary and multicomponent mixtures containing a constant mole fraction of light component, and the concept of a pseudo‐heavy component is discussed. For a fixed value of the heavy component composition parameter, triangular composition diagrams with curves of constant critical temperature and constant critical pressure are presented for the ethane‐propane‐n‐butane‐n‐pentane system. Linear critical temperature parameters connecting the bounding binary and ternary systems adequately describe the critical temperature behavior of the quartenary system. The critical pressure behavior resembles that of a ternary system.