Filterkuchenwäsche zur Aufreinigung löslicher kristalliner Feststoffpartikel

Ruslim, Franky; Fleischer, Jenny; Nirschl, Hermann; Peuker, Urs A.

doi:10.1002/cite.200600011

Cited by 14 publications

(8 citation statements)

References 2 publications

(2 reference statements)

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“…In most cases, only a partial rewetting is possible so that the wash liquor is not able to infiltrate through all of the pores. Therefore, similar to the results obtained in this work, the final results when washing pre-dewatered hydrophobic particles were also very poor as reported by Fuchs [15] and Ruslim [16].…”

Section: Influence Of Predryingsupporting

confidence: 89%

Calcium‐Ion Removal from Peat by a Mechanical Filter Cake Washing Process

Ruslim¹,

Nirschl²,

Mezhibor³

et al. 2007

Chem Eng & Technol

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This contribution aims to bridge two different fields of science, viz., geoecology and mechanical process engineering. The study reports on the application of mechanical washing processes especially filter cake washing, on calcium-ion removal from peat, which is a natural material that is used in different fields of application such as agriculture, medicine, cosmetics, etc. The interesting properties of peat such as its porous structure and the sorption behavior influence the distribution of liquid inside the bulk and the liquid flow behavior through the porous structure. Experimental results are obtained from filtration tests using differential gas pressure in a filter nutsche. The washing efficiency is determined for different pressures and specific amounts of applied wash liquor. It is found that the water repellent phenomena that occurs when peat has been dried, affects the washing efficiency in a very negative way. The results obtained are compared to the conventional filter cake washing process.

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Section: Influence Of Predryingsupporting

confidence: 89%

Calcium‐Ion Removal from Peat by a Mechanical Filter Cake Washing Process

Ruslim¹,

Nirschl²,

Mezhibor³

et al. 2007

Chem Eng & Technol

Self Cite

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“…This liquid flow texture at low flow velocities is known as trickle flow in trickle-bed reactors (Gianetto and Specchia, 1992). These findings in washing processes were supported by measurements using magnetic resonance imaging (Ruslim et al, 2005(Ruslim et al, , 2006a and fluorescent materials such as fluorescein (Ruslim et al, 2006b). The inhomogeneous liquid distribution and problems of solids wetting were also found as typical symptoms in catalyst wetting in the trickle flow regime (Ravindra et al, 1997).…”

Section: Resultssupporting

confidence: 61%

Optimization of the wash liquor flow rate to improve washing of pre-deliquored filter cakes

Ruslim¹,

Nirschl²,

Stahl³

et al. 2007

Chemical Engineering Science

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Filter cake washing is a common way of improving the quality in purity of particulate products in solid-liquid separation processes. In industrial applications, this process step is usually treated as a black box where optimization is performed through trial and error. Decisive progress has been made in academia by the development of physical models to describe the washing phenomena inside a porous structure such as filter cakes. Although some models have led to a better understanding of the process, experimental efforts are still inevitable for determining optimization strategies. This contribution is an empirical approach to investigate the influence of important process parameters of washing pre-deliquored cakes with the focus on the wash liquor and filtrate flow rate. In washing a pre-deliquored cake, low moisture content at the time of wash liquor addition can be very disadvantageous for the wash efficiency due to inhomogeneous flow. This can be the result of a poor re-wetting process while washing at low wash liquor flow rates. An increase of the flow rate was observed to be very advantageous to set higher moisture content of the filter cake and therefore enforce a homogeneous distribution of the wash liquor. A homogeneous distribution of the wash liquor inside the cake is generally required for good washing. ᭧

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“…), in einer Vielzahl von Anwendungsfeldern und Industriebranchen [1]. Gefordert ist das Entfernen einer gelösten Verunreinigung zur Qualitätserhöhung des Feststoffs oder das Gewinnen eines gelösten Wertprodukts aus der Porenflüssigkeit [2]. Für diesen Aufreinigungsschritt bietet sich die Durchströmungswäsche (auch: Verdrängungswäsche oder Filterkuchenwäsche) des Filterkuchens an.…”

Section: Motivation Und Zielunclassified

Durchströmungswäsche gesättigter und untersättigter Filterkuchen

Brückner

Sprott

Peuker

et al. 2021

Chemie Ingenieur Technik

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In großtechnischen Prozessen bietet sich die Durchströmungswäsche zur Aufreinigung eines Filterkuchens an. Eine Vorentfeuchtung vor dem Waschschritt verhindert das unerwünschte Vermischen von Suspensions-und Waschflüssigkeit auf der Kuchenoberfläche. Der Einfluss dieser Vorentfeuchtung auf die Durchströmungswäsche wird mit einer Labornutsche untersucht. Der Vergleich von Entfeuchtungskinetik vor der Wäsche und Wiederbefeuchtungskinetik zu Beginn der Wäsche zeigt, dass die Wiederbefeuchtung innerhalb einer deutlich kürzeren Zeitskala abläuft. Die ursprüngliche Sättigung von S = 1 wird nicht mehr erreicht, sondern eine Gleichgewichtssättigung S < 1. Die Vorentfeuchtung bewirkt in keinem der drei Waschbereiche eine Verschlechterung, z. T. sogar leichte Besserstellungen, erhöht jedoch den Zeitbedarf.

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Filterkuchenwäsche zur Aufreinigung löslicher kristalliner Feststoffpartikel

Cited by 14 publications

References 2 publications

Calcium‐Ion Removal from Peat by a Mechanical Filter Cake Washing Process

Calcium‐Ion Removal from Peat by a Mechanical Filter Cake Washing Process

Optimization of the wash liquor flow rate to improve washing of pre-deliquored filter cakes

Durchströmungswäsche gesättigter und untersättigter Filterkuchen

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