Gas-phase simulated moving bed: Propane/propylene separation on 13X zeolite

Martins, Vanessa Duarte; Ribeiro, Ana M.; Plaza, M.G.; Santos, João C.; Loureiro, José M.; Ferreira, Alexandre F. P.; Rodrigues, Alı́rio E.

doi:10.1016/j.chroma.2015.10.038

Cited by 48 publications

(57 citation statements)

References 49 publications

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“…23 A P&ID of the SMB unit is shown in the Supporting Information (see Figure S1). Nevertheless, a brief description of the unit is presented here.…”

Section: Methodsmentioning

confidence: 99%

“…The inclusion of the recycle stream is a major breakthrough in comparison to our previous study on the separation of propane/propylene by SMB, since only a three zones configuration without recycle was tested and successfully implemented. 23 Based on our previous work, the 4-2-2 and 4-2-1-1 configurations were selected. The recycle loop is forced by means of a vacuum pump with the purpose of re-pressurizing the exit of the last column of Zone IV before mixing it with the fresh desorbent stream.…”

Section: Smb Cycles To Produce Polymer-grade Ethylenementioning

confidence: 99%

“…The high energy requirements and the increasing demand have been the driving forces to develop new technologies and/or materials which must be cheaper, yet environmentally friendly. Among the competing alternatives towards this end, cyclic adsorption processes such as vacuum pressure swing adsorption (VPSA) [16][17][18][19][20] and simulated moving bed (SMB) [21][22][23] technologies appears to be the most promising and energy-efficient options.…”

Section: Introductionmentioning

confidence: 99%

“…44 More recently, our research group, built a gas-phase SMB bench unit and proposed a 4-2-2 configuration, i.e., an open loop circuit by suppression of section IV, to separate propylene from propane on 13X zeolite with 20% binder. 23 With this work, our group has shown experimentally, for the first time, that it is possible to produce polymer-grade olefin with a high recovery, by gas-phase SMB at a bench scale. 23 This latest advance in gas-phase SMB applied to olefin/paraffin separation, sets the basis for the work presented here: polymer-grade ethylene production from ethane/ethylene mixtures by four-zones gas-phase SMB with recycle.…”

mentioning

confidence: 96%

“…23 With this work, our group has shown experimentally, for the first time, that it is possible to produce polymer-grade olefin with a high recovery, by gas-phase SMB at a bench scale. 23 This latest advance in gas-phase SMB applied to olefin/paraffin separation, sets the basis for the work presented here: polymer-grade ethylene production from ethane/ethylene mixtures by four-zones gas-phase SMB with recycle. The enhanced binderless 13X zeolite beads/propane set is suggested as adsorbent/desorbent pair to carry out the separation of two target mixtures: 0.22/0.78 and 0.48/0.52 ethane/ethylene.…”

mentioning

confidence: 96%

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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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“…23 A P&ID of the SMB unit is shown in the Supporting Information (see Figure S1). Nevertheless, a brief description of the unit is presented here.…”

Section: Methodsmentioning

confidence: 99%

Section: Smb Cycles To Produce Polymer-grade Ethylenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 96%

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confidence: 96%

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

et al. 2016

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Tailor‐Made Microporous Metal–Organic Frameworks for the Full Separation of Propane from Propylene Through Selective Size Exclusion

et al. 2018

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in the production of polypropylene, the world's second-most widely produced synthetic plastic. The global demand for polypropylene has been rising continuously and its annual growth rate is expected to be 4-5% before 2020, resulting in increasing need for polymer-grade (>99.5%) propylene. [3] Nevertheless, the production of highly pure propylene represents a challenging and complicated process, which involves the separation of propylene from a propane/propylene mixture. Propane/ propylene mixtures are typically obtained by steam cracking of naphtha or during fluid catalytic cracking of gas oils in refineries, with a propylene purity of 50-60% for the former and 80-87% for the latter. Conventional separation of propane and propylene relies on cryogenic distillation, which is carried out at about 243 K and 0.3 MPa in a column containing over 100 trays. [4] Undoubtedly, this heat-driven process is highly energy-intensive.To lower the energy and operational cost and to suppress the carbon emissions associated with the propylene purification process through cryogenic distillation, several alternative technologies have been proposed and among them adsorptive separation, such as pressure/temperature swing adsorption, Adsorptive separation of olefin/paraffin mixtures by porous solids can greatly reduce the energy consumption associated with the currently employed cryogenic distillation technique. Here, the complete separation of propane and propylene by a designer microporous metal-organic framework material is reported. The compound, Y 6 (OH) 8 (abtc) 3 (H 2 O) 6 (DMA) 2 (Y-abtc, abtc = 3,3′,5,5′-azobenzene-tetracarboxylates; DMA = dimethylammonium), is rationally designed through topology-guided replacement of inorganic building units. Y-abtc is both thermally and hydrothermally robust, and possesses optimal pore window size for propane/propylene separation. It adsorbs propylene with fast kinetics under ambient temperature and pressure, but fully excludes propane, as a result of selective size exclusion. Multicomponent column breakthrough experiments confirm that polymer-grade propylene (99.5%) can be obtained by this process, demonstrating its true potential as an alternative sorbent for efficient separation of propane/propylene mixtures.

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Designer Metal–Organic Frameworks for Size‐Exclusion‐Based Hydrocarbon Separations: Progress and Challenges

2020

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received his B.S. degree from Wuhan University, China, in 2012, and Ph.D. degree from Rutgers University, United States, in 2018. He then joined the Hoffmann Institute of Advanced Materials (HIAM) at Shenzhen Polytechnic, where he is currently an associate professor. His research focuses on the design of novel crystalline porous materials and their applications in adsorption and separation. Yunling Liu received his Ph.D. from Jilin University in 2000, and then he joined the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry at Jilin University as an assistant professor. He was promoted to associate professor in 2004 and then to full professor in 2008. His research focuses on the design and synthesis of porous functional metal-organic frameworks in gas storage and separation applications.

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Gas-phase simulated moving bed: Propane/propylene separation on 13X zeolite

Cited by 48 publications

References 49 publications

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

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

Tailor‐Made Microporous Metal–Organic Frameworks for the Full Separation of Propane from Propylene Through Selective Size Exclusion

Designer Metal–Organic Frameworks for Size‐Exclusion‐Based Hydrocarbon Separations: Progress and Challenges

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