Optische Extinktionsmessverfahren zur Inline‐Kontrolle disperser Stoffsysteme

Steinke, L.; Wessely, Benno; Ripperger, Siegfried

doi:10.1002/cite.200800129

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…Therefore, the utilization of further extinction ratios of more wavelengths can eliminate this ambiguity, as explained in [16]. In the validity range of the Beer-Lambert law, an explicit mean particle size and mean particle concentration can be determined [28,29]. 8) and (11).…”

Section: Spectral Extinction Methodsmentioning

confidence: 99%

“…Equation (6) links

to the calculated extinction coefficient

and the particle cross-section area

. Substituting Equation (6) into Equation (5) reveals the relationship of the measured extinction ratio of light beams

with wavelengths i and j and the ratio of their extinction coefficients

, as shown in the following equation [ 28 , 29 , 30 ]:

…”

Section: Modelsmentioning

confidence: 99%

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Monitoring of Particulate Fouling Potential of Feed Water with Spectroscopic Measurements

Weirich

Antonyuk

2023

Membranes

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The modified fouling index (MFI) is a crucial characteristic for assessing the fouling potential of reverse osmosis (RO) feed water. Although the MFI is widely used, the estimation time required for filtration and data evaluation is still relatively long. In this study, the relationship between the MFI and instantaneous spectroscopic extinction measurements was investigated. Since both measurements show a linear correlation with particle concentration, it was assumed that a change in the MFI can be detected by monitoring the optical density of the feed water. To prove this assumption, a test bench for a simultaneous measurement of the MFI and optical extinction was designed. Silica monospheres with sizes of 120 nm and 400 nm and mixtures of both fractions were added to purified tap water as model foulants. MFI filtration tests were performed with a standard 0.45 µm PES membrane, and a 0.1 µm PP membrane. Extinction measurements were carried out with a newly designed flow cell inside a UV–VIS spectrometer to get online information on the particle properties of the feed water, such as the particle concentration and mean particle size. The measurement results show that the extinction ratio of different light wavelengths, which should remain constant for a particulate system, independent of the number of particles, only persisted at higher particle concentrations. Nevertheless, a good correlation between extinction and MFI for different particle concentrations with restrictions towards the ratio of particle and pore size of the test membrane was found. These findings can be used for new sensory process monitoring systems, if the deficiencies can be overcome.

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Section: Spectral Extinction Methodsmentioning

confidence: 99%

“…Equation (6) links

to the calculated extinction coefficient

and the particle cross-section area

. Substituting Equation (6) into Equation (5) reveals the relationship of the measured extinction ratio of light beams

with wavelengths i and j and the ratio of their extinction coefficients

, as shown in the following equation [ 28 , 29 , 30 ]:

…”

Section: Modelsmentioning

confidence: 99%

Monitoring of Particulate Fouling Potential of Feed Water with Spectroscopic Measurements

Weirich

Antonyuk

2023

Membranes

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“…In particular for studying aggregation processes, spectral turbidity measurements are employed. Gruy (2001) studied the formation of small aggregates in turbulent flow with this measurement technique, while Steinke et al (2009) used it to monitor the dispersed phase in crossflow-filtration loop. Even though these papers explicitly focussed on non-stabilised systems, they inherently confirm the usefulness of the method to characterise the suspension stability.…”

Section: Stability From Monitoring Scattering and Extinction Of Radiamentioning

confidence: 99%

Dispersion of Colloidal Suspensions and Their Stability

Babick

2016

Suspensions of Colloidal Particles and Aggregates

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“…Depending on the particle size and the difference between the refractive index of the particle and that of the surrounding medium, the diffraction or scattering pattern is significantly different and characterizable. In the past, light, neutron and X-ray scattering methods have been extensively cited in other works where the structure and dynamics of particles and macromolecules in multicomponent systems are investigated [ 13 , 25 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study for a Chemical Process Particle Size Characterization System for Explosive Environments Using Low Laser Power

et al. 2020

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The industrial particle sensor market lacks simple, easy to use, low cost yet robust, safe and fast response solutions. Towards development of such a sensor, for in-line use in micro channels under continuous flow conditions, this work introduces static light scattering (SLS) determination of particle diameter using a laser with an emission power of less than 5 µW together with sensitive detectors with detection times of 1 ms. The measurements for the feasibility studies are made in an angular range between 20° and 160° in 2° increments. We focus on the range between 300 and 1000 nm, for applications in the production of paints, colors, pigments and crystallites. Due to the fast response time, reaction characteristics in microchannel designs for precipitation and crystallization processes can be studied. A novel method for particle diameter characterization is developed using the positions of maxima and minima and slope distribution. The novel algorithm to classify particle diameter is especially developed to be independent of dispersed phase concentration or concentration fluctuations like product flares or signal instability. Measurement signals are post processed and particle diameters are validated against Mie light scattering simulations. The design of a low cost instrument for industrial use is proposed.

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Optische Extinktionsmessverfahren zur Inline‐Kontrolle disperser Stoffsysteme

Cited by 11 publications

References 24 publications

Monitoring of Particulate Fouling Potential of Feed Water with Spectroscopic Measurements

Monitoring of Particulate Fouling Potential of Feed Water with Spectroscopic Measurements

Dispersion of Colloidal Suspensions and Their Stability

Feasibility Study for a Chemical Process Particle Size Characterization System for Explosive Environments Using Low Laser Power

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