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Methanol conversion to dimethyl ether over H-SAPO-34 catalyst / Grigore Pop in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7065–7071 Titre : Methanol conversion to dimethyl ether over H-SAPO-34 catalyst Type de document : texte imprimé Auteurs : Grigore Pop, Auteur ; Grigore Bozga, Auteur ; Rodica Lipsa, Auteur Année de publication : 2009 Article en page(s) : pp. 7065–7071 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Methanol  conversion  Dimethyl  ether  H-SAPO-34  molecular  sieve  Catalyst Résumé : The process of methanol conversion to dimethyl ether over an H-SAPO-34 molecular sieve was studied, using the catalyst as synthesized or formulated in an alumina matrix. The experiments were performed on the temperature interval 100−250 °C, liquid space velocities of 1−5 h−1, and pressures between 1 and 10 bar. The results evidenced a high catalytic activity of the H-SAPO-34 molecular sieve, providing in these conditions a practically total methanol transformation to dimethyl ether. Also, a special run, performed at 180 °C, with an output composition close to chemical equilibrium, showed no significant change of catalyst activity during an on-stream time of 50 h, this proving a good stability and resistance to deactivation. A published rate expression for the methanol dehydration reaction was selected and adapted to describe the experimentally observed process kinetics. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900532y [article] Methanol conversion to dimethyl ether over H-SAPO-34 catalyst [texte imprimé] / Grigore Pop, Auteur ; Grigore Bozga, Auteur ; Rodica Lipsa, Auteur . - 2009 . - pp. 7065–7071. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7065–7071 Mots-clés : Methanol  conversion  Dimethyl  ether  H-SAPO-34  molecular  sieve  Catalyst Résumé : The process of methanol conversion to dimethyl ether over an H-SAPO-34 molecular sieve was studied, using the catalyst as synthesized or formulated in an alumina matrix. The experiments were performed on the temperature interval 100−250 °C, liquid space velocities of 1−5 h−1, and pressures between 1 and 10 bar. The results evidenced a high catalytic activity of the H-SAPO-34 molecular sieve, providing in these conditions a practically total methanol transformation to dimethyl ether. Also, a special run, performed at 180 °C, with an output composition close to chemical equilibrium, showed no significant change of catalyst activity during an on-stream time of 50 h, this proving a good stability and resistance to deactivation. A published rate expression for the methanol dehydration reaction was selected and adapted to describe the experimentally observed process kinetics. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900532y

Performance assessment by simulation of a gas-recycle oxosynthesis plant with propylene Recovery / Emil-Florin Tuţa in Industrial & engineering chemistry research, Vol. 50 N° 8 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4545–4552 Titre : Performance assessment by simulation of a gas-recycle oxosynthesis plant with propylene Recovery Type de document : texte imprimé Auteurs : Emil-Florin Tuţa, Auteur ; Grigore Bozga, Auteur Année de publication : 2011 Article en page(s) : pp. 4545–4552 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gas  Propylène Résumé : A simulation study of a C4 oxosynthesis plant (gas recycle technology) was performed by using the software package Hysys. The process thermodynamics was described by UNIQUAC property model. An important drawback of this technology is a significant loss of propylene by the purge gas stream. Computer simulations were carried out to evaluate the technical performance and the investment cost of a proposed revamping scheme, allowing an advanced propylene recovery from purge gases. The cost evaluations performed with Aspen Economic Evaluation are indicating that the revamping investment cost is equivalent to the propylene savings during a three years plant running period. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101731f [article] Performance assessment by simulation of a gas-recycle oxosynthesis plant with propylene Recovery [texte imprimé] / Emil-Florin Tuţa, Auteur ; Grigore Bozga, Auteur . - 2011 . - pp. 4545–4552. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4545–4552 Mots-clés : Gas  Propylène Résumé : A simulation study of a C4 oxosynthesis plant (gas recycle technology) was performed by using the software package Hysys. The process thermodynamics was described by UNIQUAC property model. An important drawback of this technology is a significant loss of propylene by the purge gas stream. Computer simulations were carried out to evaluate the technical performance and the investment cost of a proposed revamping scheme, allowing an advanced propylene recovery from purge gases. The cost evaluations performed with Aspen Economic Evaluation are indicating that the revamping investment cost is equivalent to the propylene savings during a three years plant running period. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101731f