Potenzial von Membranen zur verbesserten Reaktionsführung von Selektivoxidationen: Katalysator‐, Reaktor‐ und Prozessebene

Hamel, Christof; Seidel‐Morgenstern, Andreas

doi:10.1002/cite.202100130

Cited by 5 publications

(2 citation statements)

References 87 publications

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“…The inlet concentration of MeOH is set to

x_{MeOH}^{in} = 0.03

with respect to experimental constrains. The tube‐to‐shell side ratio is set to 1/8, as used in previous studies 29, 31–33. The results are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Selective Oxidation of Methanol to Green Oxygenates – Feasibility Study of Fixed‐Bed and Membrane Reactors

Walter

2023

Chemie Ingenieur Technik

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A feasibility study of a conventional fixed‐bed reactor and a packed‐bed membrane reactor (PBMR) in distributor configuration is carried out for the selective oxidation of methanol to the oxygenates dimethoxymethane and methyl formate on a VOx/TiO2 catalyst. Kinetic experiments provided the reaction network and a reliable kinetic model of six main reactions involved. The PBMR offers significant advantages and potential for the formation of both target products due to an effective kinetic coupling of the oxidative dehydrogenation of methanol and the consecutive reaction steps to dimethoxymethane and methyl formate in a broad range of operation conditions.

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“…The inlet concentration of MeOH is set to

x_{MeOH}^{in} = 0.03

with respect to experimental constrains. The tube‐to‐shell side ratio is set to 1/8, as used in previous studies 29, 31–33. The results are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Selective Oxidation of Methanol to Green Oxygenates – Feasibility Study of Fixed‐Bed and Membrane Reactors

Walter

2023

Chemie Ingenieur Technik

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“…As a solution, structured catalysts were chosen for the integration of the solid catalyst in our concept , (Figures A and ). To ensure the safety of the process when contacting the reactants, membrane reactors in a distributor configuration are considered, which allow the selective supply of gaseous substances . Tubular membrane distributors can be used in simple setups, e.g., via adapted tube-in-tube reactors with O 2 -permeable tubes made from fluorinated polymer. , To fulfill the process requirements of synthesis reactions, the membrane consisting of a hydrophobic PDMS layer on a tubular ceramic support was integrated into an additively manufacturable design oriented to conventional catalytic membrane reactors .…”

Section: Microreactor Development: Concept and Requirementsmentioning

confidence: 99%

In Situ Performance Monitoring of Electrochemical Oxygen and Hydrogen Peroxide Sensors in an Additively Manufactured Modular Microreactor

Doering,

Trinkies,

Kieninger

et al. 2024

ACS Omega

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Miniaturized and microstructured reactors in process engineering are essential for a more decentralized, flexible, sustainable, and resilient chemical production. Modern, additive manufacturing methods for metals enable complex reactor-geometries, increased functionality, and faster design iterations, a clear advantage over classical subtractive machining and polymer-based approaches. Integrated microsensors allow online, in situ process monitoring to optimize processes like the direct synthesis of hydrogen peroxide. We developed a modular tube-in-tube membrane reactor fabricated from stainless steel via 3D printing by laser powder bed fusion of metals (PBF-LB/M). The reactor concept enables the spatially separated dosage and resaturation of two gaseous reactants across a membrane into a liquid process medium. Uniquely, we integrated platinum-based electrochemical sensors for the online detection of analytes to reveal the dynamics inside the reactor. An advanced chronoamperometric protocol combined the simultaneous concentration measurement of hydrogen peroxide and oxygen with monitoring of the sensor performance and self-calibration in long-term use. We demonstrated the highly linear and sensitive monitoring of hydrogen peroxide and dissolved oxygen entering the liquid phase through the membrane. Our measurements delivered important real-time insights into the dynamics of the concentrations in the reactor, highlighting the power of electrochemical sensors applied in process engineering. We demonstrated the stable continuous measurement over 1 week and estimated the sensor lifetime for months in the acidic process medium. Our approach combines electrochemical sensors for process monitoring with advanced, additively manufactured stainless steel membrane microreactors, supporting the power of sensor-equipped microreactors as contributors to the paradigm change in process engineering and toward a greener chemistry.

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Chemical Membrane Reactors

Caro

2024

Chemie Ingenieur Technik

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Chemical membrane reactors combine a chemical reaction with an in‐situ removal/import of products/educts through a permselective membrane. The corresponding reactors are named extractor‐type or distributor‐type membrane reactors. Three recent examples for boosting a chemical reaction in an extractor‐type membrane reactor with water‐selective zeolite membranes and three examples for distributor‐type membrane reactors with oxygen‐selective ceramic membranes will be discussed.

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Potenzial von Membranen zur verbesserten Reaktionsführung von Selektivoxidationen: Katalysator‐, Reaktor‐ und Prozessebene

Cited by 5 publications

References 87 publications

Selective Oxidation of Methanol to Green Oxygenates – Feasibility Study of Fixed‐Bed and Membrane Reactors

Selective Oxidation of Methanol to Green Oxygenates – Feasibility Study of Fixed‐Bed and Membrane Reactors

In Situ Performance Monitoring of Electrochemical Oxygen and Hydrogen Peroxide Sensors in an Additively Manufactured Modular Microreactor

Chemical Membrane Reactors

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