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Methane enclathration with sodium dodecyl sulfate: effect of cyclopentane and two salts on formation kinetics / Junshe S. Zhang in Industrial & engineering chemistry research, Vol. 49 N° 17 (Septembre 1, 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8267–8270 Titre : Methane enclathration with sodium dodecyl sulfate: effect of cyclopentane and two salts on formation kinetics Type de document : texte imprimé Auteurs : Junshe S. Zhang, Auteur ; Jo A. Salera, Auteur ; Jae W. Lee, Auteur Année de publication : 2010 Article en page(s) : pp 8267–8270 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Methane  Sodium  Dodecyl  Kinetics. Résumé : This work presents the effect of NaCl and NaClO4 on the kinetics of methane enclathration with cyclopentane (CP) and sodium dodecyl sulfate (SDS) in a nonstirred batch reactor. Methane and 1 cm3 of CP were charged sequentially to 150 cm3 of solutions in a high-pressure vessel and the reaction system was cooled down to 274.6 K with an initial pressure of 7.1 MPa. Hydrates are visually observed within 1 h after the onset of cooling at a SDS concentration range of 0−200 ppm. At the end of a growth period of 2.5 h, the pressure reduces to 6.4 MPa for SDS concentrations below 20 ppm, whereas it decreases to 3.2 MPa for SDS concentrations above 50 ppm without any salts, which is very close to the hydrate equilibrium pressure. With 20 ppm SDS and 1 cm3 of CP, the average enclathration rate maximizes at 1.0 mM NaCl or 5.0 mM NaClO4 as the salt concentration increases from 0 to 100 mM. However, with 100 ppm SDS, it decreases monotonically with the increased salt concentration. These results not only provide an implication of reducing the SDS dosage (down to 50 ppm or less) in regard to fast enclathration but also further our understanding of the promoting role of surfactants. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100759p [article] Methane enclathration with sodium dodecyl sulfate: effect of cyclopentane and two salts on formation kinetics [texte imprimé] / Junshe S. Zhang, Auteur ; Jo A. Salera, Auteur ; Jae W. Lee, Auteur . - 2010 . - pp 8267–8270. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 17 (Septembre 1, 2010) . - pp 8267–8270 Mots-clés : Methane  Sodium  Dodecyl  Kinetics. Résumé : This work presents the effect of NaCl and NaClO4 on the kinetics of methane enclathration with cyclopentane (CP) and sodium dodecyl sulfate (SDS) in a nonstirred batch reactor. Methane and 1 cm3 of CP were charged sequentially to 150 cm3 of solutions in a high-pressure vessel and the reaction system was cooled down to 274.6 K with an initial pressure of 7.1 MPa. Hydrates are visually observed within 1 h after the onset of cooling at a SDS concentration range of 0−200 ppm. At the end of a growth period of 2.5 h, the pressure reduces to 6.4 MPa for SDS concentrations below 20 ppm, whereas it decreases to 3.2 MPa for SDS concentrations above 50 ppm without any salts, which is very close to the hydrate equilibrium pressure. With 20 ppm SDS and 1 cm3 of CP, the average enclathration rate maximizes at 1.0 mM NaCl or 5.0 mM NaClO4 as the salt concentration increases from 0 to 100 mM. However, with 100 ppm SDS, it decreases monotonically with the increased salt concentration. These results not only provide an implication of reducing the SDS dosage (down to 50 ppm or less) in regard to fast enclathration but also further our understanding of the promoting role of surfactants. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100759p