Modeling of calcium oxalate and amorphous silica composite fouling

Yu, Hong; Sheikholeslami, R.; Doherty, William O.S.

doi:10.1002/aic.10397

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…Previous studies showed that deposits may consist of loosely bound zones in contact with the fluid and a harder and well attached layer next to the deposition surface (Melo & Pinheiro, 1986;Turner & Klimas, 2001;Yu, Sheikholeslami, & Doherty, 2005). The two cleaning stages were performed in order to try to remove both types of layers, the first stage for the loosest layer and the second stage for the dense and adhesive one.…”

Section: Cleaning Behaviour On the Different Surfacesmentioning

confidence: 99%

Deposition from a milk mineral solution on novel heat transfer surfaces under turbulent flow conditions

Rosmaninho

Rizzo

Müller‐Steinhagen

et al. 2008

Journal of Food Engineering

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Section: Cleaning Behaviour On the Different Surfacesmentioning

confidence: 99%

Deposition from a milk mineral solution on novel heat transfer surfaces under turbulent flow conditions

Rosmaninho

Rizzo

Müller‐Steinhagen

et al. 2008

Journal of Food Engineering

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“…A significant problem in the sugar industry is the formation of scale on the heating surfaces of tubes in evaporator units. In Australian sugar mills the most important intractable scales forming in the late stages of the evaporation process are calcium oxalate monohydrate (COM) and dihydrate (COD) and silica 1. COM and COD together make up about 50 wt % and silica accounts for about 30 wt % of all scale formed in the fourth and fifth effects 2.…”

Section: Introductionmentioning

confidence: 99%

Effect of poly(acrylic acid) end‐group functionality on inhibition of calcium oxalate crystal growth

Wallace

Al-Hamzah

East

et al. 2009

J of Applied Polymer Sci

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A number of series of poly(acrylic acids) (PAA) of differing end-groups and molecular weights prepared using atom transfer radical polymerization were used as inhibitors for the crystallization of calcium oxalate at 23 and 80 C. As measured by turbidimetry and conductivity and as expected from previous reports, all PAA series were most effective for inhibition of crystallization at molecular weights of 1500-4000. However, the extent of inhibition was in general strongly dependent on the hydrophobicity and molecular weight of the endgroup. These results may be explicable in terms of adsorption/desorption of PAA to growth sites on crystallites. The overall effectiveness of the series didn't follow a simple trend with end-group hydrophobicity, suggesting self-assembly behavior or a balance between adsorption and desorption rates to crystallite surfaces may be critical in the mechanism of inhibition of calcium oxalate crystallization.

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“…The control of calcium oxalate crystallization is a significant challenge in a number of different environments, including bleached wood pulp production1 and in vivo within the urinary tract 2–4. Our interest in calcium oxalate arises from the importance of calcium oxalate in cane sugar milling, where calcium oxalate monohydrate and dihydrate are major components of recalcitrant scaling in sugar mill evaporators 5–10. The sources of calcium oxalate in sugar mills are calcium hydroxide (added to the juice in the clarification stage), and oxalic acid, which is both originally present in the sugar cane and formed in situ by oxidation of sucrose 11…”

Section: Introductionmentioning

confidence: 99%

Effect of poly(acrylic acid) molecular mass and end‐group functionality on calcium oxalate crystal morphology and growth

East¹,

Wallace²,

Al-Hamzah³

et al. 2009

J of Applied Polymer Sci

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A number of series of poly(acrylic acids) (PAA) of differing end-groups and molecular mass were used to study the inhibition of calcium oxalate crystallization. The effects of the end-group on crystal speciation and morphology were significant and dramatic, with hexyl-isobutyrate end groups giving preferential formation of calcium oxalate dihydrate (COD) rather than the more stable calcium oxalate monohydrate (COM), while both more hydrophobic end-groups and less-hydrophobic end groups led predominantly to formation of the least thermodynamically stable form of calcium oxalate, calcium oxalate trihydrate. Conversely, molecular mass had little impact on calcium oxalate speciation or crystal morphology. It is probable that the observed effects are related to the rate of desorption of the PAA moiety from the crystal (lite) surfaces and that the results point to a major role for end-group as well as molecular mass in controlling desorption rate.

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Modeling of calcium oxalate and amorphous silica composite fouling

Cited by 7 publications

References 10 publications

Deposition from a milk mineral solution on novel heat transfer surfaces under turbulent flow conditions

Deposition from a milk mineral solution on novel heat transfer surfaces under turbulent flow conditions

Effect of poly(acrylic acid) end‐group functionality on inhibition of calcium oxalate crystal growth

Effect of poly(acrylic acid) molecular mass and end‐group functionality on calcium oxalate crystal morphology and growth

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