Molecular sieve sorbents for kinetic separation of propane/propylene

Padin, Joel; Rege, Salil U.; Yang, Ralph T.; Cheng, Linda S.

doi:10.1016/s0009-2509(00)00099-3

Cited by 111 publications

(88 citation statements)

References 19 publications

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“…Most recently, several inorganic materials have proved to be useful for kinetic separations [34,36,[168][169][170][171][172][173]. A special kind of titanosilicates, ETS-4, cation exchanged with alkaliearth metals can be used for kinetic separations [35,41,174,175].…”

Section: The Role Of the Adsorbent In Psamentioning

confidence: 99%

“…Information about the adsorption equilibrium of the different species is vital to design and model adsorption processes [19][20][21][22][23][24][25][26][27]. The time required to achieve the equilibrium state may be also important, particularly when the size of the pores of the adsorbent are close to the size of the molecules to be separated [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

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Advances in Pressure Swing Adsorption for Gas Separation

Grande

2012

ISRN Chemical Engineering

186

108

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Pressure swing adsorption (PSA) is a well-established gas separation technique in air separation, gas drying, and hydrogen purification separation. Recently, PSA technology has been applied in other areas like methane purification from natural and biogas and has a tremendous potential to expand its utilization. It is known that the adsorbent material employed in a PSA process is extremely important in defining its properties, but it has also been demonstrated that process engineering can improve the performance of PSA units significantly. This paper aims to provide an overview of the fundamentals of PSA process while focusing specifically on different innovative engineering approaches that contributed to continuous improvement of PSA performance.

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Section: The Role Of the Adsorbent In Psamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advances in Pressure Swing Adsorption for Gas Separation

Grande

2012

ISRN Chemical Engineering

186

108

View full text Add to dashboard Cite

show abstract

“…[33][34][35][36] The main drawback of this technology is the low olefin recovery, when high purities are required. Increasing purity to polymer-grade levels (>99.9%), results in a further decrease of recovery.…”

Section: Introductionmentioning

confidence: 99%

Development of gas‐phase SMB technology for light olefin/paraffin separations

et al. 2016

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The separation of ethylene from ethane is particularly complex due to their similar physical properties. Cryogenic distillation is the most common technology employed for this separation and is one of the most expensive operations in industry, being the driving force for the ongoing research to find a more cost-effective alternative. In the present work, a gas-phase simulated moving bed (SMB) bench unit was employed to produce polymer-grade ethylene from ethane/ethylene mixtures, using binderless 13X zeolite beads as adsorbent, and propane as desorbent. The achieved performance parameters demonstrated the high efficiency of the current technology, since ethylene was obtained with a purity of 99.8%, a recovery of 99.8%, and a productivity of 59.7 kg C2H4 Áh 21 Ám 23 adsorbent . Considering the encouraging results obtained it is fair to say that the gas-phase SMB is a competitive and strong candidate as alternative to the conventional process, especially when combined with enhanced performance adsorbents, such as binderless zeolites.

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“…Of the various alternative technologies, adsorption appears to be quite promising. However, the key to development of an economically viable adsorption separation process lies in development of an adsorbent that offers an ideal adsorption capacity and selectivity for olefin/paraffin at a given temperature and pressure range [7][8][9][10][11][12].The adsorption capacities and selectivity for hydrocarbonscan then be exploited, for instance, to design temperature/pressure swing adsorption (TSA/PSA) processes for the petrochemical industry.…”

Section: Introductionmentioning

confidence: 99%

A density functional theory study on the interaction of paraffins, olefins, and acetylenes with Na-ETS-10

2015

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High demand for economically viable separation processes like adsorptive separation for mixtures of hydrocarbons drives the need for understanding the interaction of hydrocarbons with titanosilicate adsorbents, to replace the energy intensive cryogenic hydrocarbon separation.Density functional theory (DFT) was used to optimize the geometries and calculate the enthalpies for the interactions between paraffins (C 2 H 6 , C 3 H 8 ), olefins (C 2 H 4 , C 3 H 6 ) and acetylenes (C 2 H 2 , C 3 H 4 ) with a cluster model of the Engelhard titanosilicatehaving sodium extra framework cations (Na-ETS-10). The DFT calculations were performed with theM06-L exchange correlation functional and were corrected for the basis set superposition error with the counterpoise method. The calculated enthalpies for the interaction of hydrocarbons with Na-ETS-10 decrease with the decrease in the number of carbon atoms, in the order acetylenes >olefins >paraffins,and compare well with experimental data available in the literature. The enthalpies calculated at the M06-L/6-31++G** level of theory for the two extreme cases, i.e., strongest and weakest interactions, are -62.8 kJ·mol -1 (C 3 H 4 ) and -26.9 kJ·mol -1 (C 2 H 6 ).Additionally, the calculated vibrational frequencies are in good agreement with the characteristic vibrational modes of ETS-10 and of the interactions of hydrocarbons with Na + in the 12-membered channel in ETS-10.

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Molecular sieve sorbents for kinetic separation of propane/propylene

Cited by 111 publications

References 19 publications

Advances in Pressure Swing Adsorption for Gas Separation

Advances in Pressure Swing Adsorption for Gas Separation

Development of gas‐phase SMB technology for light olefin/paraffin separations

A density functional theory study on the interaction of paraffins, olefins, and acetylenes with Na-ETS-10

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