Oxyalkylation of Lignoboost (TM) Kraft Lignin with Propylene Carbonate: Design of Experiments towards Synthesis Optimization

resumo

Oxyalkylation with propylene carbonate (PC) is a safe process to convert lignin into a reactive liquid polyol to be used in polyurethane formulations. In this study, the effect of operating conditions of oxyalkylation (temperature, time and quantify of PC) on the quality of lignin-based polyol in terms hydroxyl number (I-OH) and viscosity was studied. Full factorial modeling and response surface methodology (RSM) were applied to study the effect and interaction of process variables on the I-OH and viscosity of lignin-based polyols. The results revealed that the I-OH is highly affected by the reaction time, while the viscosity is affected by the amount of PC. Validation experiments confirmed the model is reliable. Furthermore, RSM optimization allowed to reduce the amount of PC by about 50% and to increase the lignin content in the polyol from 12.5% to 25% (w/w) depending on the temperature and time of the process and also on the purpose of the polyol produced (i.e., application in rigid foams or adhesives).

palavras-chave

POLYURETHANE; OXYPROPYLATION; POLYOLS

categoria

Chemistry; Materials Science; Metallurgy & Metallurgical Engineering; Physics

autores

Vieira, FR; Barros-Timmons, A; Evtuguin, DV; Pinto, PCOR

nossos autores

Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".