In‐Line Monitoring of Vinyl Chloride Suspension Polymerization with Near‐Infrared Spectroscopy, 1 – Analysis of Morphological Properties

Abstract

It is demonstrated that during suspension polymerizations it is possible to monitor morphological characteristics of PVC resins such as bulk density, cold plasticizer absorption and average particle diameter in‐line and in real time using NIR spectroscopy. NIR spectra are obtained at different experimental conditions, showing that the spectra are sensitive to changes in the PVC properties. Standard mathematical procedures (partial least squares regression) are used to build empirical models and correlate the morphological properties with the obtained NIR spectra, allowing for monitoring of the PVC morphology in‐line and in real time.

Effect of Agitation on Density of Poly(vinyl acetate) Particles Produced in Suspension Polymerization Reactions

“…The increase of the agitation speed leads to increase of rates of particle breakup and to shifting of the final particle size distribution toward smaller particle diameters . For this reason, the agitation speed is used for control of final average particle sizes in most industrial processes . Besides, the agitation speed is also important for minimization of fouling on reactor internals and proper control of heat transfer between the reacting system and the cooling fluid.…”

Evaluation of conversion during the synthesis of aluminum (III) methacrylate-based copolymers using Raman spectroscopy and multivariate curve resolution

“…To achieve these goals it is necessary to implement some of the PAT tools, such as: the use of modern analyzers that allows rapid and in real-time measurements and multivariate analysis [18][19][20][21][22][23].…”

Modeling of Particle Size Distributions in Industrial Poly(vinyl chloride) Suspension Polymerization Reactors

“…Furthermore, the particle porosity plays an important role in the final application of the resin, since it controls the rates of plasticizer adsorption and the interaction of the resin with the plasticizers, affecting the performances of processing stages and the final properties of PVC pieces [21]. This explains the interest in the development of techniques to monitor the properties of the particles inside the reactor [22][23][24][25][26].…”