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Etherification of glycerol with isobutylene to produce oxygenate additive using sulfonated peanut shell catalyst / Weiqin Zhao in Industrial & engineering chemistry research, Vol. 49 N° 24 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12399-12404 Titre : Etherification of glycerol with isobutylene to produce oxygenate additive using sulfonated peanut shell catalyst Type de document : texte imprimé Auteurs : Weiqin Zhao, Auteur ; Bolun Yang, Auteur ; Chunhai Yi, Auteur Année de publication : 2011 Article en page(s) : pp. 12399-12404 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalyst  Additive  Etherification Résumé : A carbon-based solid acid catalyst was prepared by sulfonation of partially carbonized peanut shell, and characterized by SEM, EDS, BET analysis, FTIR spectroscopy, NH3 TPD, and TGA. The analytic results indicate that sulfonated peanut shell catalyst has an amorphous porous structure with a high acid capacity and good thermal stability and exhibits better catalytic activity for the glycerol etherification reaction than cation-exchange resin. With a molar ratio of isobutylene to glycerol of 4: a catalyst-to-glycerol mass ratio of 6 wt %, a reaction temperature of 343 K, and a reaction time of 2 h, glycerol was completely transformed into a mixture of glycerol ethers including mono-tert-butylglycerols (MTBGs), di-tert-butylglycerols (DTBGs), and tri-tert-butylglycerol (TTBG), and the selectivity toward the sum of the desired DTBGs and TTBG of 92.1% was obtained. Moreover, excellent reusability of the catalyst was also confirmed by repeated experiments. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23691993 [article] Etherification of glycerol with isobutylene to produce oxygenate additive using sulfonated peanut shell catalyst [texte imprimé] / Weiqin Zhao, Auteur ; Bolun Yang, Auteur ; Chunhai Yi, Auteur . - 2011 . - pp. 12399-12404. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12399-12404 Mots-clés : Catalyst  Additive  Etherification Résumé : A carbon-based solid acid catalyst was prepared by sulfonation of partially carbonized peanut shell, and characterized by SEM, EDS, BET analysis, FTIR spectroscopy, NH3 TPD, and TGA. The analytic results indicate that sulfonated peanut shell catalyst has an amorphous porous structure with a high acid capacity and good thermal stability and exhibits better catalytic activity for the glycerol etherification reaction than cation-exchange resin. With a molar ratio of isobutylene to glycerol of 4: a catalyst-to-glycerol mass ratio of 6 wt %, a reaction temperature of 343 K, and a reaction time of 2 h, glycerol was completely transformed into a mixture of glycerol ethers including mono-tert-butylglycerols (MTBGs), di-tert-butylglycerols (DTBGs), and tri-tert-butylglycerol (TTBG), and the selectivity toward the sum of the desired DTBGs and TTBG of 92.1% was obtained. Moreover, excellent reusability of the catalyst was also confirmed by repeated experiments. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23691993

Kinetics study of 3-methylthiophene alkylation with isobutylene catalyzed by NKC-9 ion exchange resin / Yu Liu in Industrial & engineering chemistry research, Vol. 50 N° 16 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9609-9616 Titre : Kinetics study of 3-methylthiophene alkylation with isobutylene catalyzed by NKC-9 ion exchange resin Type de document : texte imprimé Auteurs : Yu Liu, Auteur ; Bolun Yang, Auteur ; Chunhai Yi, Auteur Année de publication : 2011 Article en page(s) : pp. 9609-9616 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ion  exchange  resin  Catalytic  reaction  Alkylation  Kinetics Résumé : A series of experiments were carried out in a stirred batch reactor at the temperature range of 333-363 K and the pressure of 1.5—2.5 MPa by using NKC-9 ion-exchange resin to investigate the alkylation kinetics of 3-methylthiophene (3MT) with isobutylene (IB). The effect of various operation parameters such as stirring speed, catalyst particle size, temperature, pressure, and sulfur content on the conversion and selectivity of alkylation reaction were studied. Experimental results indicated that the alkylation of 3MT with IB was followed by a parallel reaction of IB oligomerization; higher temperature could improve the alkylation activity while lower temperature was profitable to the reaction selectivity over the NKC-9 catalyst; however, the operating pressure has little effect on the alkylation and oligomerization; much sulfur content could inhibit IB dimerization. The Eley-Rideal (ER) law can be used to explain the reaction mechanism, and the kinetics models that considered the alkylation and oligomerization at the same time were established. Kinetics parameters were solved, and the calculation results agreed well with the experimental results. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425204 [article] Kinetics study of 3-methylthiophene alkylation with isobutylene catalyzed by NKC-9 ion exchange resin [texte imprimé] / Yu Liu, Auteur ; Bolun Yang, Auteur ; Chunhai Yi, Auteur . - 2011 . - pp. 9609-9616. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 16 (Août 2011) . - pp. 9609-9616 Mots-clés : Ion  exchange  resin  Catalytic  reaction  Alkylation  Kinetics Résumé : A series of experiments were carried out in a stirred batch reactor at the temperature range of 333-363 K and the pressure of 1.5—2.5 MPa by using NKC-9 ion-exchange resin to investigate the alkylation kinetics of 3-methylthiophene (3MT) with isobutylene (IB). The effect of various operation parameters such as stirring speed, catalyst particle size, temperature, pressure, and sulfur content on the conversion and selectivity of alkylation reaction were studied. Experimental results indicated that the alkylation of 3MT with IB was followed by a parallel reaction of IB oligomerization; higher temperature could improve the alkylation activity while lower temperature was profitable to the reaction selectivity over the NKC-9 catalyst; however, the operating pressure has little effect on the alkylation and oligomerization; much sulfur content could inhibit IB dimerization. The Eley-Rideal (ER) law can be used to explain the reaction mechanism, and the kinetics models that considered the alkylation and oligomerization at the same time were established. Kinetics parameters were solved, and the calculation results agreed well with the experimental results. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24425204