Supercritical Carbon Dioxide Drying of Methanol-Zinc Borate Mixtures
Supercritical carbon dioxide (CO(2)) drying of zinc borate species was investigated to evaluate possible chemical alterations in the product during the drying. Methanol-wetted zinc borates produced either from borax decahydrate and zinc nitrate hexahydrate (2ZnO center dot 3B(2)O(3)center dot 7H(2)O...
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ftsdunivir:oai:acikerisim.sdu.edu.tr:123456789/60260 2023-05-15T15:52:34+02:00 Supercritical Carbon Dioxide Drying of Methanol-Zinc Borate Mixtures Balkose, Devrim Gupta, Ram B. Gonen, Mehmet Ulku, Semra 2009-07-14T21:00:00Z http://acikerisim.sdu.edu.tr/xmlui/handle/123456789/60260 https://doi.org/10.1021/ie9003046 https://avesis.sdu.edu.tr/publication/details/537d1094-3c98-4667-8329-b895d3ac047c/oai eng eng 537d1094-3c98-4667-8329-b895d3ac047c doi:10.1021/ie9003046 https://avesis.sdu.edu.tr/publication/details/537d1094-3c98-4667-8329-b895d3ac047c/oai http://acikerisim.sdu.edu.tr/xmlui/handle/123456789/60260 info:eu-repo/semantics/closedAccess info:eu-repo/semantics/article 2009 ftsdunivir https://doi.org/10.1021/ie9003046 2022-02-21T18:29:34Z Supercritical carbon dioxide (CO(2)) drying of zinc borate species was investigated to evaluate possible chemical alterations in the product during the drying. Methanol-wetted zinc borates produced either from borax decahydrate and zinc nitrate hexahydrate (2ZnO center dot 3B(2)O(3)center dot 7H(2)O) or from zinc oxide and boric acid (2ZnO center dot 3B(2)O(3)center dot 3H(2)O) were dried by both conventional and supercritical carbon dioxide drying methods. Zinc borate samples dried by both techniques were characterized using analytical titration, X-ray powder diffraction (XRD), thermo gravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, elemental analysis,, and scanning electron microscopy (SEM). It was found that while zinc borate obtained from zinc oxide and boric acid did not have any chemical interaction with CO(2), carbonates were formed on the surface of zinc borate obtained from borax decahydrate and zinc nitrate hexahydrate. The main factor for the carbonate formation during supercritical CO(2) drying is anticipated as the structural differences of zinc borate species. CO(2) is a nonpolar solvent, and it does not usually react with polar substances unless water is present in the medium. While 2ZnO center dot 3B(2)O(3)center dot 3H(2)O had three bound OH groups, 2ZnO center dot 3B(2)O(3)center dot 7H(2)O had five bound OH groups and one mole of water of crystallization. It is proposed that the water of crystallization reacts with CO(2) forming carbonic acid. Then, carbonic acid, which is stronger than boric acid, Substitutes borate ions from their zinc salts. Article in Journal/Newspaper Carbonic acid Suleyman Demirel University: DSpace Repository Industrial & Engineering Chemistry Research 48 14 6869 6876 |
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Suleyman Demirel University: DSpace Repository |
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English |
description |
Supercritical carbon dioxide (CO(2)) drying of zinc borate species was investigated to evaluate possible chemical alterations in the product during the drying. Methanol-wetted zinc borates produced either from borax decahydrate and zinc nitrate hexahydrate (2ZnO center dot 3B(2)O(3)center dot 7H(2)O) or from zinc oxide and boric acid (2ZnO center dot 3B(2)O(3)center dot 3H(2)O) were dried by both conventional and supercritical carbon dioxide drying methods. Zinc borate samples dried by both techniques were characterized using analytical titration, X-ray powder diffraction (XRD), thermo gravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, elemental analysis,, and scanning electron microscopy (SEM). It was found that while zinc borate obtained from zinc oxide and boric acid did not have any chemical interaction with CO(2), carbonates were formed on the surface of zinc borate obtained from borax decahydrate and zinc nitrate hexahydrate. The main factor for the carbonate formation during supercritical CO(2) drying is anticipated as the structural differences of zinc borate species. CO(2) is a nonpolar solvent, and it does not usually react with polar substances unless water is present in the medium. While 2ZnO center dot 3B(2)O(3)center dot 3H(2)O had three bound OH groups, 2ZnO center dot 3B(2)O(3)center dot 7H(2)O had five bound OH groups and one mole of water of crystallization. It is proposed that the water of crystallization reacts with CO(2) forming carbonic acid. Then, carbonic acid, which is stronger than boric acid, Substitutes borate ions from their zinc salts. |
format |
Article in Journal/Newspaper |
author |
Balkose, Devrim Gupta, Ram B. Gonen, Mehmet Ulku, Semra |
spellingShingle |
Balkose, Devrim Gupta, Ram B. Gonen, Mehmet Ulku, Semra Supercritical Carbon Dioxide Drying of Methanol-Zinc Borate Mixtures |
author_facet |
Balkose, Devrim Gupta, Ram B. Gonen, Mehmet Ulku, Semra |
author_sort |
Balkose, Devrim |
title |
Supercritical Carbon Dioxide Drying of Methanol-Zinc Borate Mixtures |
title_short |
Supercritical Carbon Dioxide Drying of Methanol-Zinc Borate Mixtures |
title_full |
Supercritical Carbon Dioxide Drying of Methanol-Zinc Borate Mixtures |
title_fullStr |
Supercritical Carbon Dioxide Drying of Methanol-Zinc Borate Mixtures |
title_full_unstemmed |
Supercritical Carbon Dioxide Drying of Methanol-Zinc Borate Mixtures |
title_sort |
supercritical carbon dioxide drying of methanol-zinc borate mixtures |
publishDate |
2009 |
url |
http://acikerisim.sdu.edu.tr/xmlui/handle/123456789/60260 https://doi.org/10.1021/ie9003046 https://avesis.sdu.edu.tr/publication/details/537d1094-3c98-4667-8329-b895d3ac047c/oai |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
537d1094-3c98-4667-8329-b895d3ac047c doi:10.1021/ie9003046 https://avesis.sdu.edu.tr/publication/details/537d1094-3c98-4667-8329-b895d3ac047c/oai http://acikerisim.sdu.edu.tr/xmlui/handle/123456789/60260 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1021/ie9003046 |
container_title |
Industrial & Engineering Chemistry Research |
container_volume |
48 |
container_issue |
14 |
container_start_page |
6869 |
op_container_end_page |
6876 |
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1766387708911943680 |