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Entrainer screening for separation of isoparaffins and naphthenes by extractive distillation / Sifang Li in Industrial & engineering chemistry research, Vol. 48 N° 11 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5427–5430 Titre : Entrainer screening for separation of isoparaffins and naphthenes by extractive distillation Type de document : texte imprimé Auteurs : Sifang Li, Auteur ; Hai Liu, Auteur Année de publication : 2009 Article en page(s) : pp. 5427–5430 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Entrainer  screening  Isoparaffins  Naphthenes  Extractive  distillation Résumé : In the entrainer screening for separation of isoparaffins and naphthenes (C9−C14) by extractive distillation of D60 oil, various single entrainers and mixed entrainers were used and studied. Sulfolane was the most selective entrainer as a single entrainer was applied and the relative volatility of isoparaffins to naphthenes reached 1.648 as the sulfolane to oil ratio was 5:1. Both mixed entrainers of sulfolane + triethylene glycol and sulfolane + dimethyl phthalate show good synergistic effect, whereas a mixed entrainer of triethylene glycol and dimethyl phthalate shows little synergistic effect. The most selective mixed entrainer was a mixture of 50 vol % of sulfolane and 50 vol % of dimethyl phthalate, the relative volatility of isoparaffins to naphthenes reached 1.835. Results from the experiment in an extractive distillation column show that isoparaffins concentration of more than 95 wt % in the isoparaffins product and naphthenes concentration of more than 94 wt % in the naphthenes product are achieved. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900267m [article] Entrainer screening for separation of isoparaffins and naphthenes by extractive distillation [texte imprimé] / Sifang Li, Auteur ; Hai Liu, Auteur . - 2009 . - pp. 5427–5430. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 11 (Juin 2009) . - pp. 5427–5430 Mots-clés : Entrainer  screening  Isoparaffins  Naphthenes  Extractive  distillation Résumé : In the entrainer screening for separation of isoparaffins and naphthenes (C9−C14) by extractive distillation of D60 oil, various single entrainers and mixed entrainers were used and studied. Sulfolane was the most selective entrainer as a single entrainer was applied and the relative volatility of isoparaffins to naphthenes reached 1.648 as the sulfolane to oil ratio was 5:1. Both mixed entrainers of sulfolane + triethylene glycol and sulfolane + dimethyl phthalate show good synergistic effect, whereas a mixed entrainer of triethylene glycol and dimethyl phthalate shows little synergistic effect. The most selective mixed entrainer was a mixture of 50 vol % of sulfolane and 50 vol % of dimethyl phthalate, the relative volatility of isoparaffins to naphthenes reached 1.835. Results from the experiment in an extractive distillation column show that isoparaffins concentration of more than 95 wt % in the isoparaffins product and naphthenes concentration of more than 94 wt % in the naphthenes product are achieved. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900267m

Preparation of acid-resisting ultramarine blue by novel two-step silica coating process / Sifang Li in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7326-7331 Titre : Preparation of acid-resisting ultramarine blue by novel two-step silica coating process Type de document : texte imprimé Auteurs : Sifang Li, Auteur ; Miao Liu, Auteur ; Lan Sun, Auteur Année de publication : 2011 Article en page(s) : pp. 7326-7331 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Coating  process  Preparation Résumé : Acid-resisting ultramarine blue pigment was prepared by a novel two-step silica coating process which is dense liquid coating followed by a sol―gel process. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and BET surface area analysis were used to characterize the composition of elements, surface structure, and morphology on the coating films. Uniform, smooth, and dense silica films on the irregular particles of ultramarine pigment were obtained via novel two-step coatings. Acid resistance of the silica-coated ultramarine blue was evaluated by immersing the pigment in 10 wt % hydrochloric acid. The silica-coated ultramarine blue prepared by the novel two-step process shows the 10th grade of acid resistance, which exhibits much higher acid resistance than that by dense liquid, sol―gel, and conventional two-step coatings. Furthermore, leaching experiments indicated that no sulfur was leached out for the sample prepared by novel two-step coatings, while hydrogen sulfide concentrations from 0.018 to 0.34 mg/L were detected in the leaching solutions for the samples prepared by the conventional two-step coating, dense liquid coating, and sol-gel process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239047 [article] Preparation of acid-resisting ultramarine blue by novel two-step silica coating process [texte imprimé] / Sifang Li, Auteur ; Miao Liu, Auteur ; Lan Sun, Auteur . - 2011 . - pp. 7326-7331. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7326-7331 Mots-clés : Coating  process  Preparation Résumé : Acid-resisting ultramarine blue pigment was prepared by a novel two-step silica coating process which is dense liquid coating followed by a sol―gel process. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and BET surface area analysis were used to characterize the composition of elements, surface structure, and morphology on the coating films. Uniform, smooth, and dense silica films on the irregular particles of ultramarine pigment were obtained via novel two-step coatings. Acid resistance of the silica-coated ultramarine blue was evaluated by immersing the pigment in 10 wt % hydrochloric acid. The silica-coated ultramarine blue prepared by the novel two-step process shows the 10th grade of acid resistance, which exhibits much higher acid resistance than that by dense liquid, sol―gel, and conventional two-step coatings. Furthermore, leaching experiments indicated that no sulfur was leached out for the sample prepared by novel two-step coatings, while hydrogen sulfide concentrations from 0.018 to 0.34 mg/L were detected in the leaching solutions for the samples prepared by the conventional two-step coating, dense liquid coating, and sol-gel process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239047