Hydrogenation of 2,2-Dimethylol-1-butanal and 2,2-Dimethylol-1-propanal to Trimethylolpropane and Trimethylolethane over a Supported Nickel Catalyst
| Autor: | Lars Peter Lindfors, Tiina-Kaisa Rantakylä, Jyrki Kuusisto, Tapio Salmi, Tapio Ollonqvist, Päivi Mäki-Arvela, Juhani Väyrynen |
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| Rok vydání: | 2002 |
| Předmět: |
General Chemical Engineering
Formaldehyde chemistry.chemical_element General Chemistry Heterogeneous catalysis Industrial and Manufacturing Engineering Catalysis Thermogravimetry Trimethylolethane chemistry.chemical_compound Nickel chemistry Organic chemistry Methanol Trimethylolpropane Nuclear chemistry |
| Zdroj: | Industrial & Engineering Chemistry Research. 41:524-530 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie001000a |
| Popis: | The hydrogenation kinetics of 2,2-dimethylol-1-butanal (TMP-aldol) and 2,2-dimethylol-1-propanal (TME-aldol) over a supported nickel catalyst were determined with experiments carried out in a batchwise operating autoclave at 50−90 °C and 40−80 bar hydrogen. Water was used as the solvent. TMP- and TME-aldol were hydrogenated with 100% selectivity to the corresponding triols. The effects of the catalyst activation procedure and the formaldehyde concentration on the hydrogenation kinetics were studied with thermogravimetry, X-ray photoelectron spectroscopy, and hydrogenation experiments. Catalyst reduction at a high temperature (400 °C) under hydrogen flow was favorable because of a more effective reduction of nickel oxides. Formaldehyde had a considerable retarding effect on the aldol hydrogenation: the hydrogenation rate was low until all of the formaldehyde was hydrogenated to methanol. The hydrogenation rate of TME-aldol was found to be significantly lower than that of TMP-aldol at low temperatures and ... |
| Databáze: | OpenAIRE |
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