Reaction monitoring in polymer production

Illustratin Reaction monitoring

High-tech polymers are the product of multilayered, intricate polymerization reactions. Monitoring the reaction process and reliably determining the endpoint is of critical importance in view of product quality and plant efficiency. Learn more about our solutions for reaction monitoring on this page:


Real-time reaction monitoring with spectroscopy

With NIRSystems from Metrohm, you can benefit from a technology that provides tailored solutions to make your industrial processes safer, more eco-friendly, and more effective.

Spectroscopic methods are predestined for polymerization process monitoring. Available as benchtop and inline systems, Metrohm NIRSystems analyzers help you to keep track of what's going on in your reactors. These techniques yield results in seconds, do away with reagents, and are nondestructive.

For direct inline measurement, Metrohm offers the NIRS Analyzer PRO. With this system, you no longer have to worry about sampling or sample preparation.

Download our overview of spectroscopic applications below to get an idea of the impressive versatility of spectroscopy. If you would like know more, then read our whitepapers on near-infrared spectroscopy in polymer production processes and on fiber-optic probes.


Checking the finish on nylon fibers with NIRS

Representation of a polyamide 6,6 molecule

To ensure fiber cohesion and prevent fiber fraying, nylon fibers are given an oil finish. The oil finish applied must be quantitatively monitored in real time for the finished product to meet quality requirements and production efficiency to be increased.

You can achieve this using NIR spectroscopy. This method does not require any sample preparation and delivers results in virtually no time.

Read how you can check the nylon finish with Metrohm NIRSystems analyzers.


Related products and information

Near-infrared spectroscopy analyzer for granules, powders, liquids, slurries

NIRS Analyzer PRO

In-process NIR analyzer for a variety of samples: granules, powders, liquids, slurries, or opalescent substances. 

Go to the NIRS Analyzer PRO
Near-infrared spectroscopy analyzer for solids and liquid samples

NIRS Lab Analyzers

Benchtop NIR spectroscopy system for liquid and solid samples. 

Go to the NIRS XDS RapidContent Analyzer
Learn how to troubleshoot issues in titration

Webinar: Titration and NIRS

Watch this webinar and learn how you can reduce overprocessing and improve production consistency by combining NIR spectroscopy with titration.

Go to the webinar

Reaction monitoring with online process analyzers

Reaction monitoring requires analytical techniques that deliver quick and accurate results. The best way to fulfill this requirement is to analyze where the reaction takes place. The Metrohm Process Analytics brand offers a wide range of analytical solutions for a vast array of applications. You can thus benefit from automated measurements with lab-grade quality.

Sulfuric acid and zinc sulfate in viscose/rayon production

Spools of rayon/viscose thread

In the wet-spinning process turning wood pulp into viscose (rayon) polymer fibers, the raw material is submerged in a bath containing sulfuric acid (to acidify the cellulose xanthate), sodium sulfate (for rapid coagulation), and zinc sulfate (to cross-link the viscose molecules). The acid and zinc concentration has to be known at all times to ensure an optimum process.

With an ADI 2045TI Process Analyzer from Metrohm Process Analytics, you can monitor these parameters simultaneously and online. And if you want to monitor just one of these parameters, the 2026 Titrolyzer is perfectly suited for this task.


Determining sulfuric acid traces in acetone and phenol

Pool billiard balls made of phenolic resin

Phenol is an important feedstock in the manufacture of some very common polymers, such as polyamides (nylons), polycarbonates, and phenol-formaldehyde resins.

The most commonly applied method for phenol production is the cumene process. In this process, cumene is produced from benzene and propylene and then converted to cumene hydroperoxide. Lastly, the cumene hydroperoxide has to be decomposed to phenol and acetone. To catalyze this reaction, small amounts of sulfuric acid are added. However, the presence of sulfuric acid can promote corrosion and lead to the formation of undesired byproducts during downstream distillation and purification. This makes accurate online analysis of the sulfuric acid content in the products necessary.

You can perform this online determination with an ADI 2045TI or 2026 Titrolyzer installed in an Ex proof shelter or an ADI 2045TI Ex proof analyzer (certified for Zone-1 and Zone-2 areas).



2026 Titrolyzer single-method process analyzer for titrimetric applications

2026 Titrolyzer

Online single-parameter analyzer for potentiometric titration: automated, accurate, and easy to use.

Go to the 2026 Titrolyzer
Online process analyzer for titration, Karl Fischer titration, colorimetry, and more

ADI 2045TI Process Analyzer

Robust, high-precision online analyzer capable of analyzing two sample streams simultaneously.

Go to the ADI 2045TI
Explosion-proof online process analyzer for titration, Karl Fischer titration, colorimetry, and more

ADI 2045TI Ex proof

Online process analyzer version for hazardous environments. The instrument fulfills EU Directive 94/9/EC (ATEX95) requirements and is certified for Zone-1 and Zone-2 areas.

Go to the ADI 2045TI Ex proof

Read more Process Analytics applications