| Titre : | Oxygenated biofuels from butanol for diesel blends: synthesis of the acetal 1,1-dibutoxyethane catalyzed by amberlyst-15 Ion-exchange resin (2010) |
| Auteurs : | Nuno S. Graça, Auteur ; Luis S. Pais, Auteur ; Viviana M. T. M. Silva, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 49 N° 15, Août 2010) |
| Article en page(s) : | pp 6763–6771 |
| Note générale : | Chimie industrielle |
| Langues : | Anglais |
| Tags : | Biofuels butanol Dibutoxyethane. |
| Résumé : | The synthesis of 1,1-dibutoxyethane or acetaldehyde dibutylacetal was studied in a batch reactor by reacting butanol and acetaldehyde in a liquid phase, using Amberlyst-15 as the catalyst. The reaction equilibrium constant was experimentally determined in the temperature range 20−40 °C at 6 atm, where Ka = 0.00959 exp[1755.3/T (K)]. The standard properties of the reaction at 298.15 K were estimated: ΔH° = −14.59 kJ mol−1, ΔG° = −3.07 kJ mol−1, and ΔS° = −38.64 J mol−1 K−1. Kinetic experiments were performed in the temperature range 10−50 °C at 6 atm. A two-parameter kinetic law based on a Langmuir−Hinshelwood rate expression, using activity coefficients from the UNIFAC method, was used. The kinetic parameters are kc = 2.39 × 109 exp[−6200.9/T (K)] (mol gcat−1 min−1) and ks,D = 2.25 × 10−4 exp[3303.1/T (K)]. The activation energy of the reaction is 51.55 kJ mol−1. This work is an important step for further implementation of an integrated reaction−separation process, such as a simulated moving-bed reactor. |
| DEWEY : | 660 |
| ISSN : | 0888-5885 |
| En ligne : | http://pubs.acs.org/doi/abs/10.1021/ie901635j |
