Speaker
Description
Online analysis has been widely developed to monitor the chemistry or the physics on batch or
continuous processes. One of the major issues concerns the sampling part to integrate the analyt-
ical solution into the process. Optical spectroscopy is one of the most used technologies as it can
be implemented directly inline and does not necessary required a sampling loop to adapt the pro-
cess to the analyzer. The main advantage is the possibility to use probes or flow cells that can be
immerged directly into the process. A wide range of probes exists to be able to fit with the process
conditions like the temperature, pressure, or rotation speed. The possibility of using optical fibers
allows to deport the analyzer from the processes to protect the sensitive part of it.
In the case of reactive extrusion processes, online analysis is not commonly used as the constraints
have some difference from the classical batch or continuous processes. Harsh conditions like high
temperature and pressure, melt product with high viscosity make sampling part challenging. Op-
tical spectroscopy can monitor most of the reaction done inside an extruder and the objective here
is to present how optical spectroscopy probes can be implemented directly inline. Reactive extru-
sion like grafting onto a polymer, depolymerization or even homogeneous mixing of polymers are
presented to demonstrate its interest.
Online analysis into extruder can be used to do optimization of the process conditions to find the
best quality product. An approach using near infrared spectroscopy, chemometrics tools like the
PCA (Principal Component Analysis) and a design of experiments based on Bayesian optimization
is also presented here. This approach allows to put in place self-optimization of the processes.
| Type of presentation | Contributed Talk |
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