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dc.contributor.authorArami-Niya, Arash
dc.contributor.authorRufford, T.E.
dc.contributor.authorDresp, G.
dc.contributor.authorAl Ghafri, S.
dc.contributor.authorJiao, F.
dc.contributor.authorMay, E.F.
dc.date.accessioned2020-04-01T14:49:08Z
dc.date.available2020-04-01T14:49:08Z
dc.date.issued2019
dc.identifier.citationArami-Niya, A. and Rufford, T.E. and Dresp, G. and Al Ghafri, S. and Jiao, F. and May, E.F. 2019. Measurements of helium adsorption on natural clinoptilolite at temperatures from (123.15 to 423.15) K and pressures up to 35 MPa. Separation and Purification Technology. 223: pp. 1-9.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/78453
dc.identifier.doi10.1016/j.seppur.2019.04.049
dc.description.abstract

Helium (He) is an increasingly valuable gas that is relatively difficult to recover: most of the global helium supply is produced through the application of deep cryogenic separation processes to the overheads from a nitrogen rejection unit in an LNG plant. Pressure swing adsorption (PSA) offers an alternative low-cost process for recovering He from natural gas, particularly if a helium selective adsorbent with sufficient capacity could be identified. However, the accurate measurement of the helium equilibrium capacity on narrow pore adsorbents is particularly challenging. Here, the uptake of helium on a natural clinoptilolite-rich Escott zeolite was measured with a volumetric adsorption apparatus at temperatures from 123.15 to 423.15 K and pressures up to 5 MPa, and with a gravimetric adsorption apparatus at temperatures in the range 243.15–423.15 K and pressures up to 35 MPa. We used these two experimental data sets to determine the specific inaccessible solid volume (vs) and true void volume of the Escott zeolite by eliminating the common assumption of zero helium uptake. Instead, the data analysis workflow established by Sircar (2001) and by Gumma and Talu (2003) was applied to the adsorption isotherms measured using the gravimetric apparatus. This led to a specific inaccessible solid volume for the Escott zeolite of 0.462 cm3·g−1, with a maximum helium adsorption capacity of 0.9 mmol·g−1 measured at 253.15 K and 35 MPa. The isosteric heat of adsorption for helium on the Escott zeolite was estimated to be 3.05 kJ·mol−1. The uptake of N2 on the Escott zeolite was also measured; these data were used together with the helium measurements to estimate conditions at which an equilibrium selectivity of 3 for He over N2 might be achieved in an equimolar He + N2 mixture.

dc.languageEnglish
dc.publisherELSEVIER SCIENCE BV
dc.subjectScience & Technology
dc.subjectTechnology
dc.subjectEngineering, Chemical
dc.subjectEngineering
dc.subjectGIBBS DIVIDING SURFACE
dc.subjectNANOPORES
dc.subjectZEOLITES
dc.subjectKINETICS
dc.subjectREGION
dc.subjectN-2
dc.subjectCH4
dc.subjectCO2
dc.titleMeasurements of helium adsorption on natural clinoptilolite at temperatures from (123.15 to 423.15) K and pressures up to 35 MPa
dc.typeJournal Article
dcterms.source.volume223
dcterms.source.startPage1
dcterms.source.endPage9
dcterms.source.issn1383-5866
dcterms.source.titleSeparation and Purification Technology
dc.date.updated2020-04-01T14:49:08Z
curtin.departmentWASM: Minerals, Energy and Chemical Engineering
curtin.accessStatusFulltext not available
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidArami-Niya, Arash [0000-0001-6450-0774]
dcterms.source.eissn1873-3794
curtin.contributor.scopusauthoridArami-Niya, Arash [36468096400]
dc.date.embargoEnd2021-04-17


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