Comparison of modified alpha functions of the PR-EoS for volume and enthalpy prediction of natural gases

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dc.creatorAndré de Freitas Gonçalves
dc.creatorEsly Ferreira da Costa Junior
dc.creatorAndréa Oliveira Souza da Costa
dc.date.accessioned2023-07-31T16:39:20Z
dc.date.accessioned2025-09-08T23:01:54Z
dc.date.available2023-07-31T16:39:20Z
dc.date.issued2020
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1590/0001-3765202020190603
dc.identifier.issn1678-2690
dc.identifier.urihttps://hdl.handle.net/1843/57232
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofAnais da Academia Brasileira de Ciências
dc.rightsAcesso Aberto
dc.subjectEntalpia
dc.subjectGás natural
dc.subjectAnálise volumétrica
dc.subject.otherAlpha function
dc.subject.otherEnthalpy
dc.subject.otherEquation of state
dc.subject.otherNatural gas
dc.subject.otherPeng-Robinson
dc.subject.otherVolume
dc.titleComparison of modified alpha functions of the PR-EoS for volume and enthalpy prediction of natural gases
dc.typeArtigo de periódico
local.citation.epage16
local.citation.issue3
local.citation.spagee20190603
local.citation.volume92
local.description.resumoProper simulation of processes of the natural gas industry such as dehydration, liquefaction and regasification require accurate prediction of thermodynamic properties of the working fluids. For such processes, cubic equations of state are the calculation methods most frequently employed. Among them, the Peng-Robinson equation is usually the one recommended for gas, refinery and petrochemical applications in many simulators. Numerous works have been proposed in order to improve the temperature dependence relation of the attraction parameter of the equation – the so called alpha function. In this work, five currently available alpha functions are evaluated for the prediction of molar volumes and enthalpies of natural gas samples. Additionally, parameters of one of the models are readjusted to volumetric data of methane, in order to represent its supercritical behavior more accurately. Experimental data of 44 mixtures are compared with calculated results. Van der Waals mixing rules are used, with binary interaction parameters set as zero. In the case of the original alpha function, it is also tested how the inclusion of non-zero binary parameters affects the predictions. The extended Saffari-Zahedi model presents the smallest average deviation for the molar volumes (1.35%). For the enthalpy calculation, the inclusion of the binary parameters results in deviation values of 2.62% for gas-gas transitions and 4.44% for gas-liquid transitions.
local.identifier.orcidhttps://orcid.org/0000-0002-2302-4801
local.identifier.orcidhttps://orcid.org/0000-0002-6763-9752
local.identifier.orcidhttps://orcid.org/0000-0002-9245-4223
local.publisher.countryBrasil
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA QUÍMICA
local.publisher.departmentENGENHARIA - ESCOLA DE ENGENHARIA
local.publisher.initialsUFMG
local.url.externahttps://www.scielo.br/j/aabc/a/ktJ3DLP77hJhtxDt4jMqGPp/?lang=en

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