Effect of regeneration thermal treatment of cellulosic and starchy materials on their capacity to separate water and ethanol
Φόρτωση...
Ημερομηνία
Συγγραφείς
Vareli, G.
Demertzis, P. G.
Akrida-Demertzi, K.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Journal of Cereal Science
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Inverse gas chromatography was used to study the adsorption of water and ethanol on to a starchy (wheat flour) and a cellulosic (wheat straw) substrate, in the temperature range 50 90 degrees C, before and after their regeneration by thermal treatments at 140 and 170 degrees C, for 12 and 21 h each. From the chromatographic retention data it was possible to calculate the separation factor (s) of the two solutes and to obtain values for Gibb's free energy (Delta Gs) and enthalpy (Delta Hs) of adsorption. The results showed that water was adsorbed more strongly than ethanol by both substrates, at all temperatures, before and after their regeneration. In addition, it was found that, for both untreated and thermally treated materials, the adsorption of both solutes was stronger at lower temperatures. Thermal treatment had no effect on the adsorption of ethanol on either substrate. In contrast, the adsorption of water was weaker for both substrates regenerated at 140 degrees C and even weaker for the substrates treated at 170 degrees C, irrespective of the duration of the regeneration process. Furthermore, at both regeneration temperatures, the decrease in water sorption was approximately the same for both materials, irrespective odf regeneration time. The separation factors followed, in general, the same trend observed for water sorption. They had lower values for materials regenerated at 170 degrees C for 24 h. Both materials were equally affected by the regeneration process. (C) 2000 Academic Press.
Περιγραφή
Λέξεις-κλειδιά
water-ethanol separation, regeneration, inverse gas chromatography, wheat-straw, adsorption, biomass, sorption, extraction, systems, vapors
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000086173800005
http://ac.els-cdn.com/S0733521099902552/1-s2.0-S0733521099902552-main.pdf?_tid=68f59b8e-37c9-11e3-ac3f-00000aacb362&acdnat=1382082574_21acd589e62a09c4cceae0b6028ccc6c
http://ac.els-cdn.com/S0733521099902552/1-s2.0-S0733521099902552-main.pdf?_tid=68f59b8e-37c9-11e3-ac3f-00000aacb362&acdnat=1382082574_21acd589e62a09c4cceae0b6028ccc6c
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας