In‐Line Monitoring of Size Distributions in Liquid‐Liquid Dispersions and Suspension Polymerizations by Focused Beam Reflectance Measurements

Poblete, Israel Bernardo S.; Castor, Carlos A.; Nele, Márcio; Pinto, José Carlos

doi:10.1002/masy.201400017

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…F ocused beam reflectance measurement (FBRM) is a measurement technique that allows for in-situ dynamic measurements of particle or drop sizes in a process. The FBRM probe is used extensively in crystallization processes and a number of processes with a solid dispersed phase, [1][2][3][4][5][6][7] as well as in the study of liquid/liquid dispersions [7][8][9][10][11][12] and more recently it has been applied to crude oil systems. [13][14][15][16][17][18] The FBRM probe directs a laser beam through a sapphire window into the fluid and collects backscattered light.…”

Section: Introductionmentioning

confidence: 99%

Effective sapphire repellency treatment to reduce fouling of a focused beam reflectance measurement (FBRM) probe in bituminous systems

et al. 2019

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The use of a focused beam reflectance measurement (FBRM) probe to track the chord length distribution dynamics in a bituminous system can be very challenging. Material coats the sapphire window of the probe and the quality of the data is compromised. The fouling index is a parameter used to assess the quality of the FBRM data. It is provided by the software and is the percentage similarity between two consecutive scans of the instrument, indicating how much of the reading has not changed due to material that is stuck to the optical window. When the FBRM was used in bitumen froth, the fouling index was higher than 90 %. In this work the significant reduction in fouling achieved with a sapphire repellency treatment is presented. The reduction in fouling was sufficient to detect broad trends in the FBRM data that will be used in future studies but was not sufficient to ensure quantitative measurement of the chord length distribution.

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Section: Introductionmentioning

confidence: 99%

Effective sapphire repellency treatment to reduce fouling of a focused beam reflectance measurement (FBRM) probe in bituminous systems

et al. 2019

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“…However, the applications of FBRM and ORM techniques in the suspension polymerization are rare. Recently, Poblete et al . employed FBRM for inline monitoring of liquid–liquid (styrene–water) dispersions and styrene suspension polymerizations and found that FBRM is capable of monitoring the initial particle breakage stage and the attainment of the final breakage/coalescence equilibrium in dispersion experiments, and coalescence stage in suspension polymerizations.…”

Section: Introductionmentioning

confidence: 99%

Online monitoring of drop/particle size and size distribution in liquid–liquid dispersions and suspension polymerizations by optical reflectance measurements

Xie

Pan

Bao

2016

J of Applied Polymer Sci

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Evolutions of drop/particle size and size distribution in liquid-liquid dispersions and suspension polymerizations of methyl methacrylate (MMA) were monitored by using an online optical reflectance measurement (ORM), and effects of operating parameters such as the agitation rate, concentration of poly(vinyl alcohol) (PVA) dispersant, and initial concentration of poly(methyl methacrylate) (PMMA) in MMA monomer on the Sauter mean diameter (d 32 ) and size distribution of drop/particle were investigated. According to the variations of d 32 of drops/particles with time, four characteristic particle formation stages can be identified for suspension polymerization process. The factors that lead to increase the rate of drop break up, such as increasing of concentration of PVA and decreasing of viscosity of dispersed phase, would postpone the particle growth stage. The d 32 and size distribution breadth of drops/particles were significant increased when the liquid-liquid dispersions or suspension polymerizations were conducted at low PVA concentrations or MMA/PMMA solutions with high PMMA contents were used as the dispersed phase, in consistent with the scanning electron micrograph observation on final PMMA particles. It is clear that ORM can be effectively applied in online monitoring of size and size distribution of drops/particles in the liquid-liquid dispersions and suspension polymerizations.

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Particle size distributions of P(VAc-co-MMA) beads produced through nonconventional suspension copolymerizations II. Use of focused beam reflectance measurements for in-line monitoring of chord size distributions

Azevedo

Pinto

2020

Powder Technology

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In‐Line Monitoring of Size Distributions in Liquid‐Liquid Dispersions and Suspension Polymerizations by Focused Beam Reflectance Measurements

Cited by 3 publications

References 20 publications

Effective sapphire repellency treatment to reduce fouling of a focused beam reflectance measurement (FBRM) probe in bituminous systems

Effective sapphire repellency treatment to reduce fouling of a focused beam reflectance measurement (FBRM) probe in bituminous systems

Online monitoring of drop/particle size and size distribution in liquid–liquid dispersions and suspension polymerizations by optical reflectance measurements

Particle size distributions of P(VAc-co-MMA) beads produced through nonconventional suspension copolymerizations II. Use of focused beam reflectance measurements for in-line monitoring of chord size distributions

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