Method for the determination of the conjugated diolefins content of a sample using near infrared spectrum and method for controlling a unit

摘要

The method involves taking a series of samples (i) at an input/output of an industrial unit for hydrogenation at a frequency. A reference sample is selected from an intermediate sample in the series for which maleic anhydride value (MAV) is found chemically. PIR spectra of each sample (i) are obtained. The spectrum difference is formed between the spectrums of each sample (i) and reference sample. The delta mav of each sample (i) is derived from the difference using a correlation from a calibration base. The MAV of the sample (i) is obtained from the delta mav and reference sample`s MAV.