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Eingeladener Vortrag
- nein (142)
Immer im Bild mittels Prozess-Spektroskopie - Spektroskopische Methoden für die Prozessanalytik
(2012)
Establishing ZIF‐8 as a reference material for hydrogen cryoadsorption: An interlaboratory study
(2024)
AbstractHydrogen storage by cryoadsorption on porous materials has the advantages of low material cost, safety, fast kinetics, and high cyclic stability. The further development of this technology requires reliable data on the H2 uptake of the adsorbents, however, even for activated carbons the values between different laboratories show sometimes large discrepancies. So far no reference material for hydrogen cryoadsorption is available. The metal‐organic framework ZIF‐8 is an ideal material possessing high thermal, chemical, and mechanical stability that reduces degradation during handling and activation. Here, we distributed ZIF‐8 pellets synthesized by extrusion to 9 laboratories equipped with 15 different experimental setups including gravimetric and volumetric analyzers. The gravimetric H2 uptake of the pellets was measured at 77 K and up to 100 bar showing a high reproducibility between the different laboratories, with a small relative standard deviation of 3–4 % between pressures of 10–100 bar. The effect of operating variables like the amount of sample or analysis temperature was evaluated, remarking the calibration of devices and other correction procedures as the most significant deviation sources. Overall, the reproducible hydrogen cryoadsorption measurements indicate the robustness of the ZIF‐8 pellets, which we want to propose as a reference material.
qNMR - The handbook
(2023)
Quantitative NMR (qNMR) has been around for a long time, but also has great potential to solve future problems in any quantitative analysis. As a primary method, it differs fundamentally from chromatographic methods: it is better described as a quantum mechanical balance. Succesful implementation of qNMR requires certain attention to detail. "qNMR - the handbook" is intended to be a guide for analysts to help understand the fundamental principles of NMR and the significant points relating to its implementation for quantitation. Regulatory considerations of qNMR adoption are explained. NMR fundamentals are explained to provide understanding. Together with many useful examples, the book is a compelling addition to the laboratory's reference library, providing all the tools that any practitioner should know to successfully implement qNMR.
The authors are qNMR pioneers and come from a variety of backgrounds including business, government and academia.
Quantitative online NMR spectroscopy of technical mixtures: on the fly quantification of fluids
(2014)
In this paper quantitative NMR spectroscopy is demonstrated as a tool for process analytical technology (PAT) in order to obtain real time information from dynamic processes. Different methods for quantification are presented and as a result the limit of detection for NMR measurement could be determined to 3.3 mg kg-1 (ethanol in water). As model processes esterification reactions and dissolution of pharmaceutical formulations are presented and important process parameters are extracted. Furthermore it is demonstrated that not only 1H-NMR spectroscopy can be used for process monitoring but also 13C-NMR for technical mixtures.
Derzeit finden gravierende Veränderungen im Umfeld der Informations- und Kommunikationstechnik statt, die eine große Chance für die optimierte Prozessführung und Wertschöpfung mit darauf abgestimmten vernetzt kommunizierenden Sensoren bieten. Diese Art „smarte“ Sensoren stellen Dienste innerhalb eines Netzwerks bereit und nutzen Informationen daraus. Dieses ist die Voraussetzung für die Realisierung von Cyber Physical Systems (CPS) innerhalb zukünftiger Automatisierungskonzepte für die Prozessindustrie, wie sie auch durch das Zukunftsprojekt „Industrie 4.0“ adressiert werden. Smarte Prozess-Sensoren ermöglichen neue Geschäftsmodelle für Anwender, Gerätehersteller, Dienstleister.
In this contribution a Raman spectrometer based control structure for the heating of a desorption column is proposed. For this purpose calibration experiments for the absorption of carbon dioxide using monoethanolamine solutions are carried out and calibration models are developed to measure both carbon dioxide liquid loads and monoethanolamine mass fractions. The calibration experiments are supported by online NMR spectroscopy to accurately measure the appearance of all species in the electrolyte system. Both models are tested during the plant operation of a mini-plant for the oxidative coupling of methane and the proof of concept for the control structure is given. The Raman spectroscopy implemented in the ATEX conform mini-plant shows a reliable and robust performance being even indifferent to impurities hindering the GC analysis.
As presented at the NAMUR general meeting 2015, the technology roadmap "Process Sensors 4.0" identifies the necessary requirements as well as the communication abilities of such process sensors. We report on the progress of discussions in trialogue between users, software and device manufacturers as well as the research.
An important key is the definition of an appropriate and uniform topology for such smart sensors, which will be driven forward in a new NAMUR AK 3.7 "smart sensors" in mutual exchange with device and software manufacturers and research institutions.
Die auf der NAMUR HS 2015 vorgestellte Technologie-Roadmap „Prozess-Sensoren 4.0“ zeigt die nötigen Anforderungen an Prozess-Sensoren sowie an deren Kommunikations-fähigkeiten auf.
Eine Topologie für smarte Sensoren, das Zusammenwirken mit daten- und modellbasierte Steuerungen bis hin zur Softsensorik sowie weitere Anforderungen an Sensoren sind heute noch nicht angemessen beschrieben. Wir müssen jetzt schnell die Weichen für eine smarte und sichere Kommunikationsarchitektur stellen, um zu einer störungsfreien Kommunikation aller Sensoren auf Basis eines einheitlichen Protokolls zu kommen, welches alle Sensoren ausgeben und verstehen.