Adsorption and Separation of C1−C8 Alcohols on SAPO-34

Autor: Julien Cousin Saint Remi, Joeri Denayer, Gino Baron, Paul A. Webley, Ranjeet Singh, Tom Remy
Přispěvatelé: Chemical Engineering and Industrial Chemistry, Chemical Engineering and Separation Science
Rok vydání: 2011
Předmět:
Zdroj: Vrije Universiteit Brussel
ISSN: 1932-7455
1932-7447
DOI: 10.1021/jp111615e
Popis: Adsorption and separation of 1-alcohols were studied on theSAPO-34 molecular sieve, which is the catalyst of choice for the methanol-toolefins(MTO) process. Vapor phase adsorption isotherms of methanol andethanol were measured at 343 K using the gravimetric technique. Liquid phaseisotherms of pure 1-alcohols and mixtures were obtained by batch adsorptionmeasurements at room temperature. These experiments highlighted the occurrenceof a window effect, giving rise to a strongly chain length-dependent adsorption anddiffusion. Lower alcohols such as methanol and ethanol were able to fill the entirepore volume. Alcohols larger than 1-butanol only adsorb in very small amounts after3 h, as their adsorption in the SAPO-34 pores is sterically hindered, which gives riseto diffusional limitations. Binary batch experiments showed preferential adsorptionof short chain alcohols (i.e., ethanol) from longer chain molecules. Breakthroughseparation experimentswith several alcohol mixtures were performed at 298473Kand varying flow rates from 0.1 to 4.0 mL/min. Separation of ethanol from hexanolcould be achieved at room temperature. SAPO-34 is also able to selectively remove ethanol from 1-propanol at room temperature. Anincrease in temperature to 348 K, however, improves the separation as a result of the improved ethanol diffusivity. The observed effect canbe used to separate short chain molecules from longer ones.
Databáze: OpenAIRE
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