Title: On-line monitoring of methanol and methyl formate in the exhaust gas of an industrial formaldehyde production plant by a mid-IR gas sensor based on tunable Fabry-Pérot filter technology
Language: English
Authors: Genner, Andreas 
Gasser, Christoph 
Moser, Harald 
Ofner, Johannes 
Schreiber, Josef 
Lendl, Bernhard  
Category: Original Research Article
Issue Date: 2017
Journal: Analytical and Bioanalytical Chemistry 
ISSN: 1618-2642
On-line monitoring of key chemicals in an industrial production plant ensures economic operation, guarantees the desired product quality, and provides additional in-depth information on the involved chemical processes. For that purpose, rapid, rugged, and flexible measurement systems at reasonable cost are required. Here, we present the application of a flexible mid-IR filtometer for industrial gas sensing. The developed prototype consists of a modulated thermal infrared source, a temperature-controlled gas cell for absorption measurement and an integrated device consisting of a Fabry-Pérot interferometer and a pyroelectric mid-IR detector. The prototype was calibrated in the research laboratory at TU Wien for measuring methanol and methyl formate in the concentration ranges from 660 to 4390 and 747 to 4610 ppmV. Subsequently, the prototype was transferred and installed at the project partner Metadynea Austria GmbH and linked to their Process Control System via a dedicated micro-controller and used for on-line monitoring of the process off-gas. Up to five process streams were sequentially monitored in a fully automated manner. The obtained readings for methanol and methyl formate concentrations provided useful information on the efficiency and correct functioning of the process plant. Of special interest for industry is the now added capability to monitor the start-up phase and process irregularities with high time resolution (5 s).
Keywords: Formaldehyde production; Fabry-Pérot detector; Mid-infrared; Process analytical chemistry; Methyl formate Methanol
DOI: 10.1007/s00216-016-0040-9
Library ID: AC15187465
URN: urn:nbn:at:at-ubtuw:3-3937
Organisation: E164 - Institut für Chemische Technologien und Analytik 
Publication Type: Article
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