Mid Infrared Spectroscopy for Chemical Reaction Monitoring

Mid Infrared (MIR) spectroscopy has benefits over near infrared (NIR) analysis in chemical reaction monitoring as it is capable of looking more effortlessly at functional groups for liquid processes and provides simultaneous monitoring of many chemical species.

In general, NIR permits the observation of general reaction monitoring and MIR permits the monitoring of particular compounds; the combination of both datasets could provide more information about chemical mechanisms.

The observation window is considered to be the eye to the process when using optical analysis methods for in-situ applications.

Reliable analysis at any time is provided only by a clean observation window during biological and chemical processes. Hence, the use of optical methods is only possible when the following procedures are performed in a reliable manner and at any time.

  • Cleaning of observation window
  • Cleanliness check of the observation window
  • Active control over the complete analyzer
  • Zero baseline at any time
  • Entire cleaning of all parts which have contact with product (seals, surfaces, etc.) following the guidelines of Hygiene, GMP etc.

It is now possible to incorporate an automated fiber optic analyzer system to the reaction by using approved flanges and fittings from KNICK. The fully or semi automated SensoGate-FOS and remotely operated Ceramat-FOS for use in high safety and sensitive processes are altered in such a way that allows the cleaning and optimal usage of fiber optic immersion probes. For complete automation, the connection of the retractable, cleanable fitting to process control systems can be effortlessly realized with the control unit UNICAL-FOS 9000.

Measurement Examples

Dairy production: wash cycle.

Dairy production: wash cycle.

Sunflower oil production monitoring.

Sunflower oil production monitoring.

Olive oil production monitoring.

Olive oil production monitoring.

Attenuated Total Reflection (ATR) Immersion Probe

A variety of fiber optic ATR Immersion Probes for process spectroscopy applications are available. Sealed diamond or ZnSe tips offer high contrast evanescent absorption spectra in the temperature range of 0-140 °C.

Attenuated Total Reflection (ATR) Disposable Loop

PIR fiber probes in the 3-18 µm range with detachable PIR fiber loops have been designed to provide an inexpensive alternative to diamond ATR-IR fiber probes.

Lighthouse Probe

It is possible to use the Lighthouse Probe® with a range of spectroscopic techniques, including NIR and UV/VIS, in order to overcome the traditional problem of product sticking to observation windows. It is compact and simple to install and it makes it possible to take a reliable in-process measurement of quality critical product characteristics.

Ceramat® WA 150

The automatic sensor lock-gate is used for extreme applications with ceramic sealing to the process. It remains reliably sealed off, even when the process medium is corrosive, toxic, hot and under pressure.

SensoGate® WA 130

The universal, pneumatically operated retractable fitting with a modular design has a central multiplug, which comprises of tubings for rinsing, cleaning and calibration media, including check valves and limit switches and allows a safe, fast and space-saving connection.

This information has been sourced, reviewed and adapted from materials provided by art photonics GmbH.

For more information on this source, please visit art photonics GmbH.

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