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Additional pilot plant measurements with incorporation of reflux for the fractionation of wax derivatives with supercritical propane / Cara E. Schwarz in Industrial & engineering chemistry research, Vol. 51 N° 51 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 4462–4467 Titre : Additional pilot plant measurements with incorporation of reflux for the fractionation of wax derivatives with supercritical propane Type de document : texte imprimé Auteurs : Cara E. Schwarz, Auteur ; Izak Nieuwoudt, Auteur ; Johannes. H. Knoetze, Auteur Année de publication : 2012 Article en page(s) : pp. 4462–4467 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Wax  Derivatives Résumé : Previous studies have shown that supercritical propane can be used to fractionate waxlike alcohol ethoxylates according to the number of ethylene oxide units and that the column temperature, pressure, and solvent to feed ratio influence the selectivity and overheads to feed ratio. Additional pilot plant experiments were conducted to obtain the effect of various process variables. The effect of reflux and the degree thereof as well as the combined influence of the column temperature, the column pressure, the solvent to feed ratio, and the use of reflux were investigated to qualitatively determine how the optimum operating conditions should be selected. To obtain a higher selectivity, lower temperatures and pressures should be used. Furthermore, the solvent to feed ratio as well as the use of reflux can be varied to optimize the separation according to the desired ethylene oxide fractionation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900397t [article] Additional pilot plant measurements with incorporation of reflux for the fractionation of wax derivatives with supercritical propane [texte imprimé] / Cara E. Schwarz, Auteur ; Izak Nieuwoudt, Auteur ; Johannes. H. Knoetze, Auteur . - 2012 . - pp. 4462–4467. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 4462–4467 Mots-clés : Wax  Derivatives Résumé : Previous studies have shown that supercritical propane can be used to fractionate waxlike alcohol ethoxylates according to the number of ethylene oxide units and that the column temperature, pressure, and solvent to feed ratio influence the selectivity and overheads to feed ratio. Additional pilot plant experiments were conducted to obtain the effect of various process variables. The effect of reflux and the degree thereof as well as the combined influence of the column temperature, the column pressure, the solvent to feed ratio, and the use of reflux were investigated to qualitatively determine how the optimum operating conditions should be selected. To obtain a higher selectivity, lower temperatures and pressures should be used. Furthermore, the solvent to feed ratio as well as the use of reflux can be varied to optimize the separation according to the desired ethylene oxide fractionation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900397t

New association scheme for 1-alcohols in alcohol/water mixtures with sPC-SAFT: / Adriaan J. De Villiers in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8711–8725 Titre : New association scheme for 1-alcohols in alcohol/water mixtures with sPC-SAFT: : the 2C association scheme Type de document : texte imprimé Auteurs : Adriaan J. De Villiers, Auteur ; Cara E. Schwarz, Auteur ; Andries J. Burger, Auteur Année de publication : 2011 Article en page(s) : pp. 8711–8725 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Alcohol  Water Résumé : A new association scheme for sPC-SAFT, denoted as 2C, is presented for more-accurate predictions of 1-alcohol/water phase equilibria than with the 2B or 3B association schemes. This 2C association scheme consists of one bipolar association site and one negative electron donor site and is a combination of the 1A and 2B/3B association schemes. The performance of the 2C scheme is evaluated and compared to the 2B and 3B schemes by modeling the vapor–liquid equilibria and liquid–liquid equilibria of alcohol/water, alcohol/alcohol and alcohol/alkane mixtures. Liquid–liquid equilibria of multicomponent systems are also considered. Compared to sPC-SAFT with the 2B or 3B schemes, sPC-SAFT-2C provides improved phase equilibria predictions for the investigated alcohol/water vapor–liquid systems, as well as for liquid–liquid equilibria of water/alcohol/alkane and water/alcohol/alcohol ternary systems. However, a slight deterioration in the prediction of binary alcohol/alkane phase equilibria is observed with the 2C scheme, compared to the 2B scheme. Furthermore, related VLE predictions with sPC-SAFT-2C compare well to predictions with the Cubic-Plus-Association (CPA) equation of state. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200521k [article] New association scheme for 1-alcohols in alcohol/water mixtures with sPC-SAFT: : the 2C association scheme [texte imprimé] / Adriaan J. De Villiers, Auteur ; Cara E. Schwarz, Auteur ; Andries J. Burger, Auteur . - 2011 . - pp. 8711–8725. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8711–8725 Mots-clés : Alcohol  Water Résumé : A new association scheme for sPC-SAFT, denoted as 2C, is presented for more-accurate predictions of 1-alcohol/water phase equilibria than with the 2B or 3B association schemes. This 2C association scheme consists of one bipolar association site and one negative electron donor site and is a combination of the 1A and 2B/3B association schemes. The performance of the 2C scheme is evaluated and compared to the 2B and 3B schemes by modeling the vapor–liquid equilibria and liquid–liquid equilibria of alcohol/water, alcohol/alcohol and alcohol/alkane mixtures. Liquid–liquid equilibria of multicomponent systems are also considered. Compared to sPC-SAFT with the 2B or 3B schemes, sPC-SAFT-2C provides improved phase equilibria predictions for the investigated alcohol/water vapor–liquid systems, as well as for liquid–liquid equilibria of water/alcohol/alkane and water/alcohol/alcohol ternary systems. However, a slight deterioration in the prediction of binary alcohol/alkane phase equilibria is observed with the 2C scheme, compared to the 2B scheme. Furthermore, related VLE predictions with sPC-SAFT-2C compare well to predictions with the Cubic-Plus-Association (CPA) equation of state. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200521k