Oxygenated Biofuels from Butanol for Diesel Blends: Synthesis of the Acetal 1,1-Dibutoxyethane Catalyzed by Amberlyst-15 Ion-Exchange Resin

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Graca, NS (Author) Other; Pais, LS (Author) Other; Silva, VMTM (Author) Other; Alírio Rodrigues (Author) FEUP

Journal

Title: Industrial & Engineering Chemistry Research

Vol. 49 No. 20

Pages: 6763-6771

ISSN: 0888-5885

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 22 Citations

ISI Web of Science

Scopus - 21 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Other information

Authenticus ID: P-003-420

DOI: 10.1021/ie901635j

Abstract (EN): 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 degrees C at 6 atm, where K(a) = 0.00959 exp[1755.3/T (K)]. The standard properties of the reaction at 298.15 K were estimated: Delta H degrees = -14.59 kJ mol(-1), Delta G degrees = -3.07 kJ mol(-1), and Delta S degrees = -38.64 J mol(-1) K(-1). Kinetic experiments were performed in the temperature range 10-50 degrees 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 k(c) = 2.39 x 10(9) exp[-6200.9/T (K)] (mol g(cat)(-1) min(-1)) and k(s,D) = 2.25 x 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9