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The near Infrared Analysis of Polyols: Process Monitoring in a Hostile Environment

Polyols are long-chain polymers which can be produced through reactions involving organic oxides, acids, and multi-functional alcohols. Varied uses for the polymeric material include polyurethanes, surfactants, paint additives, adhesives and foams. The particular use of the polymer is dependent on the molecular weight of the polyol product. Polyol products are typically produced in a batch reactor process under severe conditions (>260°C, nitrogen sparging and turbulent mixing). In addition, suspended particles are typically found in the reactor. The conditions often mean that the analysis of the poly01 reaction must be performed in the laboratory using titration methods. Near infrared (NIR) laboratory methods have been developed as an alternative to titration methods, and yield results which are equivalent to those obtained by primary analyses (see NIRSystems Application Note #14). The flexibility of NIR spectroscopy has also made it possible to develop NIR methods for the process environment. Through the use of a fibre-optic sampling interface, NIR spectroscopy provides real time (within one minute) process monitoring of the hydroxyl number and acid value endpoints in a polyol batch reactor process.