Two-column relay simulated moving-bed process for gas-phase separations

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4 Citations (Scopus)

Abstract

A new two-column, relay, simulated moving-bed (2-column R-SMB) process has been designed and implemented experimentally for the first time for gas-phase separation. Contrary to classical SMB configurations, in a R-SMB process the stream exiting a column is never partially withdrawn from the system, i.e., it is not divided into an outlet stream and a stream that is redirected to another column; instead, the stream exiting a column is handled in a relay mode: at any instant of the cycle the stream is either fully collected as product/waste or completely diverted to another column. In the present work the R-SMB concept is applied to the simplest case of separation of an isothermal, binary trace gas mixture. The separation of carbon dioxide (CO2)/methane (CH4) mixtures using nitrogen (N2) as carrier gas is evaluated as a proof-of-concept. The process is designed and optimized by model-based computer simulation and the obtained results are validated experimentally at laboratory-scale using a newly designed two-column SMB unit. The optimized 2-column R-SMB process produces extract and raffinate products both with 99%-purity (in an eluent free basis). The 2-column R-SMB performance is compared with the classical four-zone SMB and VARICOL-type configurations, and it is shown that at low feed throughput the process performances are coincident.

Original languageEnglish
Pages (from-to)19-28
Number of pages10
JournalSeparation and Purification Technology
Volume182
DOIs
Publication statusPublished - 12 Jul 2017

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Phase separation
Gases
Methane
Carbon Dioxide
Gas mixtures
Carbon dioxide
Nitrogen
Throughput
Computer simulation

Keywords

  • Gas separation
  • Relay SMB
  • Simulated moving bed
  • Two-column chromatography

Cite this

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title = "Two-column relay simulated moving-bed process for gas-phase separations",
abstract = "A new two-column, relay, simulated moving-bed (2-column R-SMB) process has been designed and implemented experimentally for the first time for gas-phase separation. Contrary to classical SMB configurations, in a R-SMB process the stream exiting a column is never partially withdrawn from the system, i.e., it is not divided into an outlet stream and a stream that is redirected to another column; instead, the stream exiting a column is handled in a relay mode: at any instant of the cycle the stream is either fully collected as product/waste or completely diverted to another column. In the present work the R-SMB concept is applied to the simplest case of separation of an isothermal, binary trace gas mixture. The separation of carbon dioxide (CO2)/methane (CH4) mixtures using nitrogen (N2) as carrier gas is evaluated as a proof-of-concept. The process is designed and optimized by model-based computer simulation and the obtained results are validated experimentally at laboratory-scale using a newly designed two-column SMB unit. The optimized 2-column R-SMB process produces extract and raffinate products both with 99{\%}-purity (in an eluent free basis). The 2-column R-SMB performance is compared with the classical four-zone SMB and VARICOL-type configurations, and it is shown that at low feed throughput the process performances are coincident.",
keywords = "Gas separation, Relay SMB, Simulated moving bed, Two-column chromatography",
author = "Ribeiro, {Rui P. P. L.} and Esteves, {Isabel A. A. C.} and Mota, {Jos{\'e} P. B.}",
note = "Financial support from FCT/MCTES (Portugal) through projects EXCL/QEQ-PRS/0308/2012, PTDC/AAC-AMB/108849/2008, PTDC/CTM/104782/2008 is gratefully acknowledged. The authors also acknowledge FCT/MCTES for financial support through grant SFRH/BPD/103533/2014 (Rui P. P. L. Ribeiro) and FCT Investigator contract IF/01016/2014 (Isabel A. A. C. Esteves). This work was partially supported by the Associate Laboratory Research Unit for Green Chemistry - Technologies and Processes Clean - LAQV which is financed by national funds from FCT/MCTES (UID/QUI/50006/2013) and co-financed by the ERDF under the PT2020 Partnership Agreement (POCI-01-0145-FEDER - 007265).",
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T1 - Two-column relay simulated moving-bed process for gas-phase separations

AU - Ribeiro, Rui P. P. L.

AU - Esteves, Isabel A. A. C.

AU - Mota, José P. B.

N1 - Financial support from FCT/MCTES (Portugal) through projects EXCL/QEQ-PRS/0308/2012, PTDC/AAC-AMB/108849/2008, PTDC/CTM/104782/2008 is gratefully acknowledged. The authors also acknowledge FCT/MCTES for financial support through grant SFRH/BPD/103533/2014 (Rui P. P. L. Ribeiro) and FCT Investigator contract IF/01016/2014 (Isabel A. A. C. Esteves). This work was partially supported by the Associate Laboratory Research Unit for Green Chemistry - Technologies and Processes Clean - LAQV which is financed by national funds from FCT/MCTES (UID/QUI/50006/2013) and co-financed by the ERDF under the PT2020 Partnership Agreement (POCI-01-0145-FEDER - 007265).

PY - 2017/7/12

Y1 - 2017/7/12

N2 - A new two-column, relay, simulated moving-bed (2-column R-SMB) process has been designed and implemented experimentally for the first time for gas-phase separation. Contrary to classical SMB configurations, in a R-SMB process the stream exiting a column is never partially withdrawn from the system, i.e., it is not divided into an outlet stream and a stream that is redirected to another column; instead, the stream exiting a column is handled in a relay mode: at any instant of the cycle the stream is either fully collected as product/waste or completely diverted to another column. In the present work the R-SMB concept is applied to the simplest case of separation of an isothermal, binary trace gas mixture. The separation of carbon dioxide (CO2)/methane (CH4) mixtures using nitrogen (N2) as carrier gas is evaluated as a proof-of-concept. The process is designed and optimized by model-based computer simulation and the obtained results are validated experimentally at laboratory-scale using a newly designed two-column SMB unit. The optimized 2-column R-SMB process produces extract and raffinate products both with 99%-purity (in an eluent free basis). The 2-column R-SMB performance is compared with the classical four-zone SMB and VARICOL-type configurations, and it is shown that at low feed throughput the process performances are coincident.

AB - A new two-column, relay, simulated moving-bed (2-column R-SMB) process has been designed and implemented experimentally for the first time for gas-phase separation. Contrary to classical SMB configurations, in a R-SMB process the stream exiting a column is never partially withdrawn from the system, i.e., it is not divided into an outlet stream and a stream that is redirected to another column; instead, the stream exiting a column is handled in a relay mode: at any instant of the cycle the stream is either fully collected as product/waste or completely diverted to another column. In the present work the R-SMB concept is applied to the simplest case of separation of an isothermal, binary trace gas mixture. The separation of carbon dioxide (CO2)/methane (CH4) mixtures using nitrogen (N2) as carrier gas is evaluated as a proof-of-concept. The process is designed and optimized by model-based computer simulation and the obtained results are validated experimentally at laboratory-scale using a newly designed two-column SMB unit. The optimized 2-column R-SMB process produces extract and raffinate products both with 99%-purity (in an eluent free basis). The 2-column R-SMB performance is compared with the classical four-zone SMB and VARICOL-type configurations, and it is shown that at low feed throughput the process performances are coincident.

KW - Gas separation

KW - Relay SMB

KW - Simulated moving bed

KW - Two-column chromatography

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U2 - 10.1016/j.seppur.2017.03.037

DO - 10.1016/j.seppur.2017.03.037

M3 - Article

VL - 182

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EP - 28

JO - Separation and Purification Technology

JF - Separation and Purification Technology

SN - 1383-5866

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