Ultrasound-assisted pretreatment under mild operating conditions has been investigated for intensification of delignification to facilitate the obtaining of ethyl levulinate from biomass. The effect of pH (2 - 12), temperature (30°C - 70°C) and pretreatment time (0 - 120 minutes) has been studied for different biomass samples. The most favorable conditions were basic pH, temperature of 70°C and pretreatment time of 2 h, obtaining values of delignification near 80 percent. The ethyl levulinate is obtained in microwave directly via from samples before and after delignification and analyzed for GC-MS. The results evidenced better yields for the delignified samples.
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机译:RBmK核反应堆:提高仪表和控制的建议,以提高安全性和可用性。 IEC技术报告类型3.工作材料。 (Reacteurs nucleaires RBmK。propositions d'ameliorations du controle-commande pour accroitre la surete et la disponibilite .Rappation technique CEI de type 3. material de travail)