Sequential liquefaction of Nicotiana tabacum stems biomass by crude polyhydric alcohols for the production of polyols and rigid polyurethane foams

摘要

In this work, Nicotiana tabacum stalks and castor oil-based polyol was synthesized via two step process. Preliminarily, stalks were liquefied using acid catalyst to procure glycol-glycoside and the optimized conditions for liquefaction of N. tabacum stem's biomass was 150 degrees C temperature for 180 min time using PTSA as catalyst. Progressively, the glycol-glycoside obtained from the former step was further reacted with castor oil in the presence of lithium hydroxide to get dark brown-colored polyol with hydroxyl value was running in between 200 and 400 IOH. Glycol-glycoside and polyols were characterized by chemical and instrumental methods. Further by employing open-cup method involving the mixing of polyol and isocyanate adducts, the desired poly urethane rigid foam was obtained. The product was tested for their physical, mechanical, thermal, and morphological characteristics, while the thermal conductivity was in the range of 0.013 to 0.017 Kcal/mh degrees C. The performed study may yield high quality rigid or semi-rigid polyurethane foams that are commonly used as insulation materials. (C) 2016 Wiley Periodicals, Inc.