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NIR spectroscopy for monitoring of industrial manufacturing processes
7 February 2017 • Author: Metrohm Appllikon
When it comes to monitoring industrial manufacturing processes, near-infrared spectroscopy (NIRS) offers a rapid and reliable supplement to conventional titration methods. With NIRS, important process parameters can be determined directly and continuously, enabling comprehensive in-process control.
The determination of chemical indices is crucial in many chemical production processes, e.g., in the manufacture of polyols, resins, fats, oils, polymers, etc. Chemical indices such as
- Hydroxyl number
- Acid number
- Amine value
- Iodine value
- Peroxide value
are used for incoming goods inspections and final product testing. Random sample checks are made, primarily during production, and traditional wet chemistry analysis methods are used. Sample preparation is usually tedious, and the analyses require the use of expensive and sometimes hazardous reagents.
NIRS detects functional groups in the molecules, e.g., the OH bonds for determining the hydroxyl number. Absorption characteristics vary depending on the particular chemical index. NIRS provides this information immediately, enabling the monitoring of the production process in real time. NIRS provides reliable results even under extreme production process conditions, with no need for sample preparation or the use of reagents.
The analysis system is linked to the process via fiber optic cable and an in situ probe. Light in the near-infrared region (800-2,200 nm) interacts with the product, and this is measured; different probes can be selected depending on the process requirements. Up to nine sample streams can be monitored by a single system.
NIRS is a multi-component method, which means that several parameters can be monitored simultaneously in a single measurement. In addition to determining the oxygen number, for example, the water content and hydroxyl number can also be quantified.
Because NIRS is a secondary analytical method, customer-specific calibrations for the parameters to be analyzed are required. Metrohm provides both, NIRS as well as the wet chemistry instrumentation and methods to perform such calibrations. Moreover, Metrohm offers a host of applications enabling the determination of single or multiple chemical indices in very different products, e.g.:
- Determination of the OH number and molar mass in polyols
- Acid, OH, and iodine numbers in oils and fats
- Epoxy number in epoxy resins
- Amine number in dipping varnishes
The benefits of in-process NIRS for the chemical industry:
- Seamless and continuous monitoring of production processes in real time
- Timely process control and optimization through rapid analysis results
- High reproducibility of the analysis results
- Multiple indices and other parameters can be obtained from a single measurement
- Low running costs, since reagents for wet-chemistry analysis methods are no longer needed
ABB Analytical Measurement ACD/Labs ADInstruments Ltd Advanced Analytical Technologies GmbH Analytik Jena AG Astell Scientific Ltd B&W Tek Bachem AG Bibby Scientific Limited Bio-Rad Laboratories BioNavis Ltd Biopharma Group Black Swan Analysis Limited Charles Ischi AG | Kraemer Elektronik Cherwell Laboratories CI Precision Cobalt Light Systems Coulter Partners CPC Biotech srl Dassault Systèmes BIOVIA DiscoverX Edinburgh Instruments Enterprise System Partners (ESP) EUROGENTEC F.P.S. Food and Pharma Systems Srl IDBS JEOL Europe L.B. Bohle Maschinen + Verfahren GmbH Lab M Ltd. LabWare Linkam Scientific Instruments Limited Metrohm Molins Technologies Multicore Dynamics Ltd Nanosurf New England Biolabs, Inc. Panasonic Biomedical Sales Europe B.V. PerkinElmer Inc ReAgent Russell Finex Limited Source BioScience Takara Clontech Tornado Spectral Systems Tuttnauer Watson-Marlow Fluid Technology Group Wickham Laboratories Limited Xylem Analytics YMC Europe GmbH Yusen Logistics