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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Moghaddam, Lalehvash
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2022A hemicellulose-first approach: one-step conversion of sugarcane bagasse to xylooligosaccharides over activated carbon modified with tandem plasma and acid treatmentscitations
- 2018The effect of cleaning agents on the structural features of heat exchanger deposits from sugar factoriescitations
- 2017Compositional and structural changes of sugarcane evaporator deposits after concentrated sodium hydroxide treatmentcitations
- 2014Preparation and characterization of composites from starch with sugarcane bagasse nanofibrescitations
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article
Compositional and structural changes of sugarcane evaporator deposits after concentrated sodium hydroxide treatment
Abstract
Fouling of industrial heat exchangers and evaporators is not only associated with energy management but also reductions in heat transfer coefficients causing loss in productivity.This paper describes the effect of NaOH solution on the removal of sugarcane factory heat exchanger deposits. Apatite, calcium oxalate, calcite, quartz, tricalcium aconitate and non-diffracting materials including amorphous silica are present in the deposits.Fourier Transform Infra-red (FTIR) spectroscopy revealed that monomeric silica species were preferential removed over oligomeric and polymeric species, while 29Si nuclear magnetic resonance (NMR) analysis not only confirmed this, but identified the types of silica units Q0 [Si(OH)4], Q1 [(OH)3*Si(OSi)], Q2 [(OH2*Si(OSi)2], Q3 [(OH)*Si(OSi)3] and Q4 [*Si(OSi)4] present, rearranged, and removed.After chemical cleaning, the scale components became truncated with indentation and contain spherical and hairy-like micro-sized particles.Also, the morphology of tetragonal CaCO4.2H2O was found to be distorted and the proportion of crystalline phases decreased through fragmentation of the scale matrix.