scholarly journals On the Numerical Simulation of Packed Bed Membrane Reactors for Methanol Synthesis from CO2 and H2: Suitable Alternatives to Packed Bed Reactor Technology

2019 ◽  
Vol 7 ◽  
Author(s):  
William Andrés Mejía Galarza ◽  
Javier Herguido Huerta ◽  
Miguel Alejandro Menéndez Sastre
Keyword(s):  
Numerical Simulation ◽  
Potential Energy ◽  
Methanol Synthesis ◽  
Membrane Reactor ◽  
Packed Bed ◽  
Energy Carrier ◽  
Membrane Reactors ◽  
Packed Bed Reactor ◽  
Reactor Technology

Methanol is considered to be a potential energy carrier. Currently, its synthesis from CO2 is performed in conventional reactors, although its yield can be improved if a packed bed membrane reactor (PBMR) is used instead. The objective of this work is to select potential PBMRs as an alternative to the conventional ones.

scholarly journals Polymer–Ceramic Composite Membranes for Water Removal in Membrane Reactors

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 472
Author(s):  
Ester Juarez ◽  
Javier Lasobras ◽  
Jaime Soler ◽  
Javier Herguido ◽  
Miguel Menéndez
Keyword(s):  
Methanol Synthesis ◽  
Membrane Reactor ◽  
Ceramic Composite ◽  
Composite Membranes ◽  
Packed Bed ◽  
Co2 Hydrogenation ◽  
Membrane Reactors ◽  
Packed Bed Reactor ◽  
Water Removal ◽  
Harsh Conditions

Methanol can be obtained through CO2 hydrogenation in a membrane reactor with higher yield or lower pressure than in a conventional packed bed reactor. In this study, we explore a new kind of membrane with the potential suitability for such membrane reactors. Silicone–ceramic composite membranes are synthetized and characterized for their capability to selectively remove water from a mixture containing hydrogen, CO2, and water at temperatures typical for methanol synthesis. We show that this membrane can achieve selective permeation of water under such harsh conditions, and thus is an alternative candidate for use in membrane reactors for processes where water is one of the products and the yield is limited by thermodynamic equilibrium.

scholarly journals Experimental Investigation of the Oxidative Coupling of Methane in a Porous Membrane Reactor: Relevance of Back-Permeation

Membranes ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 152 ◽  
Author(s):  
Aitor Cruellas ◽  
Wout Ververs ◽  
Martin van Sint Annaland ◽  
Fausto Gallucci
Keyword(s):  
Oxidative Coupling ◽  
Membrane Reactor ◽  
Effective Diffusion ◽  
Packed Bed ◽  
Porous Membrane ◽  
Oxidative Coupling Of Methane ◽  
Membrane Reactors ◽  
Packed Bed Reactor ◽  
Membrane Properties ◽  
Beneficial Effects

Novel reactor configurations for the oxidative coupling of methane (OCM), and in particular membrane reactors, contribute toward reaching the yield required to make the process competitive at the industrial scale. Therefore, in this work, the conventional OCM packed bed reactor using a Mn-Na2WO4/SiO2 catalyst was experimentally compared with a membrane reactor, in which a symmetric MgO porous membrane was integrated. The beneficial effects of distributive feeding of oxygen along the membrane, which is the main advantage of the porous membrane reactor, were demonstrated, although no significant differences in terms of performance were observed because of the adverse effects of back-permeation prevailing in the experiments. A sensitivity analysis carried out on the effective diffusion coefficient also indicated the necessity of properly tuning the membrane properties to achieve the expected promising results, highlighting how this tuning could be addressed.

scholarly journals Membrane Reactor for Methanol Synthesis Using Si-Rich LTA Zeolite Membrane

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 505
Author(s):  
Masahiro Seshimo ◽  
Bo Liu ◽  
Hey Ryeon Lee ◽  
Katsunori Yogo ◽  
Yuichiro Yamaguchi ◽  
...  
Keyword(s):  
Methanol Synthesis ◽  
Membrane Reactor ◽  
Synthesis Method ◽  
Packed Bed ◽  
Zeolite Membrane ◽  
Packed Bed Reactor ◽  
Co2 Conversion ◽  
Experimental Conditions ◽  
Reaction Field ◽  
Lta Zeolite

We successfully demonstrated the effect of a membrane reactor for methanol synthesis to improve one-pass CO2 conversion. An Si-rich LTA membrane for dehydration from a methanol synthesis reaction field was synthesized by the seed-assisted hydrothermal synthesis method. The H2O permselective performance of the membrane showed 1.5 × 10−6 mol m−2 s−1 Pa−1 as H2O permeance and around 2,000 as selectivity of H2O/MeOH at 473 K. From the results of membrane reactor tests, the CO2 conversion of the membrane reactor was higher than that of the conventional packed-bed reactor under the all of experimental conditions. Especially, at 4 MPa of reaction pressure, the conversion using the membrane reactor was around 60%. In the case of using a packed-bed reactor, the conversion was 20% under the same conditions. In addition, the calculated and experimental conversion were in good agreement in both the case of the membrane reactor and packed-bed reactor.

scholarly journals Membrane-Assisted Methanol Synthesis Processes and the Required Permselectivity

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 596
Author(s):  
Homa Hamedi ◽  
Torsten Brinkmann ◽  
Sergey Shishatskiy
Keyword(s):  
Methanol Synthesis ◽  
Membrane Reactor ◽  
Power Saving ◽  
Membrane Reactors ◽  
Synthesis Process ◽  
Power Requirement ◽  
Minimum Requirement ◽  
Advantages And Disadvantages ◽  
Process Flowsheet ◽  
Selective Membrane

Water-selective membrane reactors are proposed in the literature to improve methanol yield for a standalone reactor. However, the methanol productivity is not a precise metric to show the system improvement since, with this approach, we do not consider the amount of energy loss through the undesirable co-permeation of H2, which could otherwise remain on the reaction side at high pressure. In other words, the effectiveness of this new technology should be evaluated at a process flowsheet level to assess its advantages and disadvantages on the overall system performance and, more importantly, to identify the minimum required properties of the membrane. Therefore, an equation-based model for a membrane reactor, developed in Aspen Custom Modeler, was incorporated within the process flowsheet of the methanol plant to develop an integrated process framework to conduct the investigation. We determined the upper limit of the power-saving at 32% by exploring the favorable conditions wherein a conceptual water selective membrane reactor proves more effective. Using these suboptimal conditions, we realized that the minimum required H2O/H2 selectivity is 190 and 970 based on the exergy analysis and overall power requirement, respectively. According to our results, the permselectivity of membranes synthesized for this application in the literature, showing improvements in the one-pass conversion, is well below the minimum requirement when the overall methanol synthesis process flowsheet comes into consideration.

A Novel Reactor Configuration for Industrial Methanol Production From the Synthesis Gas

2018 ◽  
Vol 141 (4) ◽  
Author(s):  
Payam Parvasi ◽  
Seyyed Mohammad Jokar
Keyword(s):  
Methanol Synthesis ◽  
Radial Flow ◽  
Cooling Water ◽  
Packed Bed ◽  
Optimization Methods ◽  
Packed Bed Reactor ◽  
Flow Reactors ◽  
Methanol Production ◽  
Reactor Models ◽  
The Cost

In this work, the methanol synthesis on a commercial industrial catalyst in a novel cylindrical radial flow packed-bed reactor is investigated. The adiabatic and nonadiabatic cylindrical radial flow reactors were proposed and modeled in this research. The proposed configuration has been compared with conventional reactor for methanol production. It leads to higher methanol production and lower pressure drop, with the same catalyst consumption. Furthermore, the results show that the nonadiabatic radial flow packed-bed reactor has a higher methanol content compared with the adiabatic one. The improvement in methanol production was studied by optimizing the essential parameters such as inlet temperatures of the feed and cooling water as well as the number of cooling tubes. The nonlinearity and complexity of the reactor models make the traditional optimization methods ineffective and improbable. Therefore, the process was optimized by genetic algorithm (GA) method, which is one of the most powerful methods. The optimum values for the number of cooling tubes, feed and cooling water temperatures were 308, 507.6 K, and 522.43 K, respectively. The optimization results showed that a new reactor design could be proposed to reduce the cost of methanol synthesis.

Recent advances in membrane reactors for hydrogen production by steam reforming of ethanol as a renewable resource

2019 ◽  
Vol 35 (3) ◽  
pp. 377-392 ◽  
Author(s):  
Majid Taghizadeh ◽  
Fatemeh Aghili
Keyword(s):  
Noble Metal ◽  
Steam Reforming ◽  
Membrane Reactor ◽  
Renewable Resource ◽  
Packed Bed ◽  
Membrane Reactors ◽  
Hydrogen Yield ◽  
Recent Advances ◽  
Steam Reforming Of Ethanol ◽  
The Impact

AbstractDuring the last decade, hydrogen has attracted lots of interest due to its potential as an energy carrier. Ethanol is one of the renewable resources that can be considered as a sustainable candidate for hydrogen generation. In this regard, producing hydrogen from ethanol steam reforming (ESR) would be an environmentally friendly process. Commonly, ESR is performed in packed bed reactors; however, this process needs several stages for hydrogen separation with desired purity. Recently, the concept of a membrane reactor, an attractive device integrating catalytic reactions and separation processes in a single unit, has allowed obtaining a smaller reactor volume, higher conversion degrees, and higher hydrogen yield in comparison to conventional reactors. This paper deals with recent advances in ESR in terms of catalyst utilization and the fundamental of membranes. The main part of this paper discusses the performance of different membrane reactor configurations, mainly packed bed membrane reactors, fluidized bed membrane reactors, and micro-membrane reactors. In addition, a short overview is given about the impact of ESR via different catalysts such as noble metal, non-noble metal, and bi-metallic catalysts.

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