Determination of acid value, hydroxyl value and water content in reactions between dicarboxylic acids and diols using near-infrared spectroscopy and non-linear partial least squares regression was written by Heikka, Riitta A.;Immonen, Kirsi T.;Minkkinen, Pentti O.;Paatero, Erkki Y. O.;Salmi, Tapio O.. And the article was included in Analytica Chimica Acta in 1997.HPLC of Formula: 115-84-4 The following contents are mentioned in the article:
A predictive calibration model based on non-linear partial least squares (PLS) regression was developed to describe the relationship between the near-IR (NIR) reflectance spectra and the acid value, hydroxyl value, and water content in polyesterification of dicarboxylic acids with diols. Two dicarboxylic acids and six diols were tested in different combinations with one dicarboxylic acid and one diol at a time. Reactions were carried out isothermally in a laboratory scale semi-batch reactor at 140-190°. NIR spectrometry offered a fast in-line method for monitoring and controlling the polyesterification reaction. A predictive model which related all the NIR spectra and the measured acid values was developed. Calibration of the NIR spectra and the hydroxyl value succeeded in experiments in which the hydroxyl value was determined The measured water content and the NIR spectra could not be calibrated with the same model for different dicarboxylic acid and diol combinations. Principal component anal. (PCA) was used to classify the NIR spectra. The spectra could be classified according to the dicarboxylic acid and diol used in the experiment This study involved multiple reactions and reactants, such as 2-Butyl-2-ethylpropane-1,3-diol (cas: 115-84-4HPLC of Formula: 115-84-4).
2-Butyl-2-ethylpropane-1,3-diol (cas: 115-84-4) belongs to alcohols. Similar to water, an alcohol can be pictured as having an sp3 hybridized tetrahedral oxygen atom with nonbonding pairs of electrons occupying two of the four sp3 hybrid orbitals. Converting an alcohol to an alkene requires removal of the hydroxyl group and a hydrogen atom on the neighbouring carbon atom. Dehydrations are most commonly carried out by warming the alcohol in the presence of a strong dehydrating acid, such as concentrated sulfuric acid.HPLC of Formula: 115-84-4
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts