Method for determining the content of isomeres during production of isocyanate

摘要

Determining the isomer composition of an isocyanate isomer mixture (A) involves recording the spectrum of the mixture and inputting it to a chemometric calibration model. Independent claims are also included for; (1) A method for controlling a unit that produces the mixture with a standardized isomer composition by applying the new method, detecting any difference between the actual and standard isomer compositions, and controlling one or more process parameters, according to the detected difference; and (2) A unit for producing the mixture with a standard isomer composition that includes a device for recording spectra and a chemometric model for determining the actual isomer composition, device for calculating any difference between actual and standard compositions, and system for regulating process parameters.