title: Ethanol fermentation from molasses at high temperature by thermotolerant yeast Kluyveromyces sp. IIPE453 and energy assessment for recovery.
abstract: High temperature ethanol fermentation from sugarcane molasses B using thermophilic Crabtree-positive yeast Kluyveromyces sp. IIPE453 was carried out in batch bioreactor system. Strain was found to have a maximum specific ethanol productivity of 0.688 g/g/h with 92 % theoretical ethanol yield. Aeration and initial sugar concentration were tuning parameters to regulate metabolic pathways of the strain for either cell mass or higher ethanol production during growth with an optimum sugar to cell ratio 33:1 requisite for fermentation. An assessment of ethanol recovery from fermentation broth via simulation study illustrated that distillation-based conventional recovery was significantly better in terms of energy efficiency and overall mass recovery in comparison to coupled solvent extraction-azeotropic distillation technique for the same.
authors.affiliation: Biotechnology Conversion Area, Biofuels Division, CSIR-Indian Institute of Petroleum, Mohkampur, Dehradun, 248 005, Uttarakhand, India.
authors.forename: Diptarka
authors.initials: D
authors.lastname: Dasgupta
authors.forename: Prasenjit
authors.initials: P
authors.lastname: Ghosh
authors.forename: Debashish
authors.initials: D
authors.lastname: Ghosh
authors.forename: Sunil Kumar
authors.initials: SK
authors.lastname: Suman
authors.forename: Rashmi
authors.initials: R
authors.lastname: Khan
authors.forename: Deepti
authors.initials: D
authors.lastname: Agrawal
authors.forename: Dilip K
authors.initials: DK
authors.lastname: Adhikari
mesh_terms: D000222:Adaptation, Physiological; D018533:Biomass; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D006358:Hot Temperature; D007716:Kluyveromyces / Q000254:growth & development / Q000378:metabolism* / Q000502:physiology; D008965:Molasses; D012997:Solvents
chemical_list: D012997:Solvents; D000431:Ethanol