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 · 3B 2O 3 ·7H 2O) or from zinc oxide...
Published in: | Industrial & Engineering Chemistry Research |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Chemical Society
2009
|
Subjects: | |
Online Access: | http://hdl.handle.net/11147/2531 https://doi.org/10.1021/ie9003046 |
id |
ftiztech:oai:gcris.iyte.edu.tr:11147/2531 |
---|---|
record_format |
openpolar |
spelling |
ftiztech:oai:gcris.iyte.edu.tr:11147/2531 2024-06-23T07:52:03+00:00 Supercritical carbon dioxide drying of methanol-Zinc borate mixtures Balköse, Devrim Ülkü, Semra Gönen, Mehmet Gupta, Ram B. 10.1021/ie9003046 2009-07 http://hdl.handle.net/11147/2531 https://doi.org/10.1021/ie9003046 en eng American Chemical Society Industrial and Engineering Chemistry Research Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı 10.1021/ie9003046 0888-5885 http://dx.doi.org/10.1021/ie9003046 http://hdl.handle.net/11147/2531 48 14 WOS:000268138300044 2-s2.0-67849133304 doi:10.1021/ie9003046 Q2 Q1 open Carbonate formations Zinc Borate minerals Chemical alteration Water of crystallization Article 2009 ftiztech https://doi.org/10.1021/ie9003046 2024-06-11T14:40:55Z 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 · 3B 2O 3 ·7H 2O) or from zinc oxide and boric acid (2ZnO · 3B 2O 3 ·3H 2O) 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 · 3B 2O 3 ·3H 2O had three bound OH groups, 2ZnO · 3B 2O 3 ·7H 2O 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 Izmir Institute of Technology: DSpace@IZTECH Industrial & Engineering Chemistry Research 48 14 6869 6876 |
institution |
Open Polar |
collection |
Izmir Institute of Technology: DSpace@IZTECH |
op_collection_id |
ftiztech |
language |
English |
topic |
Carbonate formations Zinc Borate minerals Chemical alteration Water of crystallization |
spellingShingle |
Carbonate formations Zinc Borate minerals Chemical alteration Water of crystallization Balköse, Devrim Ülkü, Semra Gönen, Mehmet Gupta, Ram B. Supercritical carbon dioxide drying of methanol-Zinc borate mixtures |
topic_facet |
Carbonate formations Zinc Borate minerals Chemical alteration Water of crystallization |
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 · 3B 2O 3 ·7H 2O) or from zinc oxide and boric acid (2ZnO · 3B 2O 3 ·3H 2O) 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 · 3B 2O 3 ·3H 2O had three bound OH groups, 2ZnO · 3B 2O 3 ·7H 2O 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 |
Balköse, Devrim Ülkü, Semra Gönen, Mehmet Gupta, Ram B. |
author_facet |
Balköse, Devrim Ülkü, Semra Gönen, Mehmet Gupta, Ram B. |
author_sort |
Balköse, 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 |
publisher |
American Chemical Society |
publishDate |
2009 |
url |
http://hdl.handle.net/11147/2531 https://doi.org/10.1021/ie9003046 |
op_coverage |
10.1021/ie9003046 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
Industrial and Engineering Chemistry Research Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı 10.1021/ie9003046 0888-5885 http://dx.doi.org/10.1021/ie9003046 http://hdl.handle.net/11147/2531 48 14 WOS:000268138300044 2-s2.0-67849133304 doi:10.1021/ie9003046 Q2 Q1 |
op_rights |
open |
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 |
_version_ |
1802643245352615936 |