Sweep gas flow effect on membrane reactor performance for hydrogen production from high-temperature water-gas shift reaction

Chein, Reiyu; Chen, Y.C.; Chung, J. N.

doi:10.1016/j.memsci.2014.09.046

Cited by 30 publications

(3 citation statements)

References 39 publications

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“…However, the sweep gas decreases the product purity unless it can be easily separated from the product, as it is directly mixed with the permeate stream. Sweep gas has been used for other separations such as N2/CO2 or H2/CO2 and showed an enhancement in membrane performance (Merkel et al 2010;Battersby et al 2009;Chein et al 2015;Oklany et al 1998). They employed N2, air and steam as a sweep gas.…”

Section: Polymeric Mbhexu Processmentioning

confidence: 99%

A novel cost-effective silica membrane-based process for helium extraction from natural gas

Hamedi

Karimi

Gundersen

2019

Computers & Chemical Engineering

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Natural gas reserves with 0.3-2 mol% helium are considered as the only viable source for this noble gas. Currently, cryogenic separation is used to extract helium, but it is energy-intensive. While membrane-based separation is a promising alternative, it is still not considered economical. Even for an inorganic/silica membrane with relatively high selectivity and permeance, a multi-stage membrane system with inter-stage compression is required, which necessitates high CAPEX and OPEX. This study proposes a novel process to enhance the selectivity and permeance of an inorganic/silica membrane system to eliminate the costly inter-stage compression. A 16-24% reduction in the CAPEX and 23-57% in the OPEX are achievable for a natural gas feed with 3-5 mol% helium. In contrast, for a 2 mol% helium feed, the OPEX increases by 34%. However, a 30% decrease in the capital cost outweighs the OPEX increase to make the new process more profitable.

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Section: Polymeric Mbhexu Processmentioning

confidence: 99%

A novel cost-effective silica membrane-based process for helium extraction from natural gas

Hamedi

Karimi

Gundersen

2019

Computers & Chemical Engineering

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“…In membrane separation, the permeation rate of a component was profoundly affected by the partialpressure on the permeate side, which could be reduced either by vacuum or by a sweep gas. [44,45].However,the production of a vacuum adds to the cost of energy, while the use of a sweep gasis a more economical alternative.As illustrated in Figure 12,with a higher sweep gas flow rate, SO 3 conversion is promoted as a result of decreases in the partial pressure of the componentson the permeate side, which increases the driving force for permeation. When the SO 3 decompositionwas carried out at = 100 kPa with a sweep gas flow rate of 7.5×10 −5 mol s −1 ( =5), the SO 3 conversionwasabout 0.81, which wasapproximately equal to that of aCMRoperatedwiththe permeatestream evacuating toabout 15kPa and no sweep gas.It was clear that the improvement in membrane reactor performance increased as the permeate pressure decreased and/or the sweep gas flow rate increased.…”

Section: Effect Of Operation Conditionsmentioning

confidence: 99%

Catalytic membrane reactors for SO3 decomposition in Iodine–Sulfur thermochemical cycle: A simulation study

Meng

Kanezashi

Tsuru

2015

International Journal of Hydrogen Energy

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The possibility of applying a catalytic membrane reactor (CMR) to SO 3 decomposition in a low-temperature range was theoreticallyevaluated with the purpose of producing CO 2-free hydrogen inan Iodine-Sulfur thermochemical cycle.Aone-dimensional, isothermal and plug-flowmodelwas developed for a cocurrentmembrane reactor with selective permeation from the reactant stream to the permeate stream. Simulation results have revealedthat CMRs can greatly reduce the reaction temperature for SO 3 decomposition from the conventional 1,200-1,400 K to about 900 K.We predicted that porous inorganic membranes with a high O 2 permeabilityand with selectivitiesof more than 50 for O 2 /SO 3 and less than 10 for O 2 /SO 2 had the potential to effectively improve SO 3 conversion.CMRs were simulated to carry out SO 3 decomposition at different catalyst weights, reaction temperatures, and SO 3 feed flow rates as well as pressures in feed and permeate streams.SO 3 conversion at 900 Kwas increased to 0.93beyond the equilibrium conversion of 0.28due to a shift in thermodynamicequilibrium.

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“…Membrane reactors (MRs) have received significant attention for their potential use in decentralized hydrogen production systems, allowed by the integrated production and separation of hydrogen [ 1 , 2 , 3 ]. The reactions most commonly carried out are those of steam reforming of different carbon-based feeds such as methane [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ], methanol [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ], ethanol [ 22 , 23 , 24 , 25 , 26 , 27 ], biogas [ 28 , 29 ], and glycerol [ 30 , 31 , 32 ]; water-gas shift [ 33 , 34 , 35 , 36 , 37 , 38 ]; ammonia decomposition [ 39 , 40 ]; and the dehydrogenation of alkanes [ 41 , 42 , 43 , 44 ]. In all cases the equilibrium of the reaction is shifted by removing hydrogen through a membrane.…”

Section: Introductionmentioning

confidence: 99%

Modeling Fixed Bed Membrane Reactors for Hydrogen Production through Steam Reforming Reactions: A Critical Analysis

2018

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Membrane reactors for hydrogen production have been extensively studied in the past years due to the interest in developing systems that are adequate for the decentralized production of high-purity hydrogen. Research in this field has been both experimental and theoretical. The aim of this work is two-fold. On the one hand, modeling work on membrane reactors that has been carried out in the past is presented and discussed, along with the constitutive equations used to describe the different phenomena characterizing the behavior of the system. On the other hand, an attempt is made to shed some light on the meaning and usefulness of models developed with different degrees of complexity. The motivation has been that, given the different ways and degrees in which transport models can be simplified, the process is not always straightforward and, in some cases, leads to conceptual inconsistencies that are not easily identifiable or identified.

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Sweep gas flow effect on membrane reactor performance for hydrogen production from high-temperature water-gas shift reaction

Cited by 30 publications

References 39 publications

A novel cost-effective silica membrane-based process for helium extraction from natural gas

A novel cost-effective silica membrane-based process for helium extraction from natural gas

Catalytic membrane reactors for SO3 decomposition in Iodine–Sulfur thermochemical cycle: A simulation study

Modeling Fixed Bed Membrane Reactors for Hydrogen Production through Steam Reforming Reactions: A Critical Analysis

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