Hydrothermal disproportionation of formaldehyde at subcritical conditions
In the present study, the disproportionation reaction of formaldehyde to methanol and formic acid was investigated in sub-critical water at 170-300 degrees C and 23 MPa. The cross-disproportionation of formaldehyde with formic acids to methanol and carbonic acid was also observed especially in the p...
Published in: | The Journal of Supercritical Fluids |
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ftsdunivir:oai:acikerisim.sdu.edu.tr:123456789/94655 2023-05-15T15:52:48+02:00 Hydrothermal disproportionation of formaldehyde at subcritical conditions Akgul, Gokcen Kruse, Andrea 2013-01-01T01:00:00Z http://acikerisim.sdu.edu.tr/xmlui/handle/123456789/94655 https://doi.org/10.1016/j.supflu.2012.11.007 https://avesis.sdu.edu.tr/publication/details/c085f147-d653-4dea-85f7-0c8d37604441/oai eng eng c085f147-d653-4dea-85f7-0c8d37604441 doi:10.1016/j.supflu.2012.11.007 https://avesis.sdu.edu.tr/publication/details/c085f147-d653-4dea-85f7-0c8d37604441/oai http://acikerisim.sdu.edu.tr/xmlui/handle/123456789/94655 info:eu-repo/semantics/closedAccess info:eu-repo/semantics/article 2013 ftsdunivir https://doi.org/10.1016/j.supflu.2012.11.007 2022-02-21T18:24:38Z In the present study, the disproportionation reaction of formaldehyde to methanol and formic acid was investigated in sub-critical water at 170-300 degrees C and 23 MPa. The cross-disproportionation of formaldehyde with formic acids to methanol and carbonic acid was also observed especially in the presence of an excess of formic acid. It was experimentally shown that methanol is a relative stabile molecule up to 270 degrees C and its presence in the reaction medium does not influence the cross-disproportionation and formic acid decomposition. In the experimental part, the rate of the HCHO consumption was found to be 27.9 (L/mol)(0.5) s(-1) exp(-58.5 kJ mol(-1)/RT) [HCHO](1.5). In fact the reaction of formaldehyde is very complex system of consecutive and parallel reactions. Some of these reactions are of major and some of minor importance in the range of reaction conditions. Concentrating of the major reaction steps, the reaction was described by a simple model consisting of only two reaction steps. The Arrhenius factors and the activation energy of these two main reaction steps are determined by fitting. Such a simple model describes the reaction of formaldehyde reasonable well in the temperature range up to 270 degrees C. At 300 degrees C, for a good description additional reactions steps in the model would be necessary. (C) 2012 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Carbonic acid Suleyman Demirel University: DSpace Repository The Journal of Supercritical Fluids 73 43 50 |
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Suleyman Demirel University: DSpace Repository |
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ftsdunivir |
language |
English |
description |
In the present study, the disproportionation reaction of formaldehyde to methanol and formic acid was investigated in sub-critical water at 170-300 degrees C and 23 MPa. The cross-disproportionation of formaldehyde with formic acids to methanol and carbonic acid was also observed especially in the presence of an excess of formic acid. It was experimentally shown that methanol is a relative stabile molecule up to 270 degrees C and its presence in the reaction medium does not influence the cross-disproportionation and formic acid decomposition. In the experimental part, the rate of the HCHO consumption was found to be 27.9 (L/mol)(0.5) s(-1) exp(-58.5 kJ mol(-1)/RT) [HCHO](1.5). In fact the reaction of formaldehyde is very complex system of consecutive and parallel reactions. Some of these reactions are of major and some of minor importance in the range of reaction conditions. Concentrating of the major reaction steps, the reaction was described by a simple model consisting of only two reaction steps. The Arrhenius factors and the activation energy of these two main reaction steps are determined by fitting. Such a simple model describes the reaction of formaldehyde reasonable well in the temperature range up to 270 degrees C. At 300 degrees C, for a good description additional reactions steps in the model would be necessary. (C) 2012 Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Akgul, Gokcen Kruse, Andrea |
spellingShingle |
Akgul, Gokcen Kruse, Andrea Hydrothermal disproportionation of formaldehyde at subcritical conditions |
author_facet |
Akgul, Gokcen Kruse, Andrea |
author_sort |
Akgul, Gokcen |
title |
Hydrothermal disproportionation of formaldehyde at subcritical conditions |
title_short |
Hydrothermal disproportionation of formaldehyde at subcritical conditions |
title_full |
Hydrothermal disproportionation of formaldehyde at subcritical conditions |
title_fullStr |
Hydrothermal disproportionation of formaldehyde at subcritical conditions |
title_full_unstemmed |
Hydrothermal disproportionation of formaldehyde at subcritical conditions |
title_sort |
hydrothermal disproportionation of formaldehyde at subcritical conditions |
publishDate |
2013 |
url |
http://acikerisim.sdu.edu.tr/xmlui/handle/123456789/94655 https://doi.org/10.1016/j.supflu.2012.11.007 https://avesis.sdu.edu.tr/publication/details/c085f147-d653-4dea-85f7-0c8d37604441/oai |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
c085f147-d653-4dea-85f7-0c8d37604441 doi:10.1016/j.supflu.2012.11.007 https://avesis.sdu.edu.tr/publication/details/c085f147-d653-4dea-85f7-0c8d37604441/oai http://acikerisim.sdu.edu.tr/xmlui/handle/123456789/94655 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.supflu.2012.11.007 |
container_title |
The Journal of Supercritical Fluids |
container_volume |
73 |
container_start_page |
43 |
op_container_end_page |
50 |
_version_ |
1766387898769211392 |