Chemical Reaction Monitoring Using Infrared Spectroscopy

When compared to near infrared (NIR) analysis, Mid Infrared (MIR) spectroscopy provides more benefits in chemical reaction monitoring as it can look more easily at functional groups for liquid processes and offers simultaneous monitoring of many chemical species.

Generally, MIR allows the observation of particular compounds monitoring whereas NIR allows the observation of general reaction monitoring; more information about chemical mechanisms can be obtained from the combination of both datasets.

Chemical Reaction Monitoring

Image credit: Art Photonics GmbH

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

During chemical and biological processes, only a clean observation window can provide reliable analysis at any time. Therefore, optical methods can be used only when the following procedures are carried out at any time and in a reliable manner.

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

Fiber optic probe prcess

Image credit: Art Photonics GmbH

Presently, an automated fiber optic analyzer system can be incorporated into the reaction by employing approved fittings and flanges from KNICK. The semi or fully automated SensoGate-FOS and remotely operated Ceramat-FOS for use in sensitive and high safety processes are modified in such a way that they enable optimal usage and cleaning of fiber optic immersion probes. For complete automation, the connection of the cleanable, retractable fitting to process control systems can be easily realized with the control unit UNICAL-FOS 9000.

Measurement Examples

Dairy production: wash cycle

Dairy production: wash cycle. Image credit: Art Photonics GmbH

Sunflower oil production monitoring

Sunflower oil production monitoring. Image credit: Art Photonics GmbH

Olive oil production monitoring

Olive oil production monitoring.Image credit: Art Photonics GmbH

Attenuated Total Reflection (ATR) Immersion Probe 

Attenuated Total Reflection (ATR) Immersion Probe

Image credit: Art Photonics GmbH

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

Attenuated Total Reflection (ATR) Disposable Loop

Attenuated Total Reflection (ATR) Disposable Loop

Image credit: Art Photonics GmbH

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

Lighthouse Probe

Lighthouse Probe

Image credit: Art Photonics GmbH

The Lighthouse Probe® can be employed with a wide variety of spectroscopic techniques, including UV/VIS and NIR, in order to overcome the conventional problem of product sticking to observation windows. In addition to being compact and simple to install, the probe enables a reliable in-process measurement of quality critical product characteristics.

Ceramat® WA 150

Ceramat® WA 150

Image credit: Art Photonics GmbH

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

SensoGate® WA 130

SensoGate® WA 130

Image credit: Art Photonics GmbH

The universal, pneumatically operated retractable fitting with a modular design features a central multiplug, which consists of tubings for cleaning, rinsing and calibration media, including limit switches and check valves, and enables a fast, safe 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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