Conversão da lignina Kraft por dois métodos de liquefação.

Abstract

In the 70s, with the crisis in oil supply, causing price instability in products derived from this and with global efforts for environmental control and economically sustainable in-dustrial, it is necessary to search for new raw materials for the production of energy, chemicals, materials and consumer goods. The production of polyols from industrial waste lignin is highly possible, mainly because they come from waste. Thus, apart from these waste stop being to be an inconvenience to industry, begin to generate higher value-added products, bringing a benefit to society. In this sense, this study aimed to evaluate the liquefaction conditions of kraft lignin by two methods and veriry their possible applications as replacements for petrochemical polyols. The polyols were characterized in terms of yield, acid value, hydroxyl index and viscosity, for the conver-sion of variables (time, mass and catalyst). It can be seen from this study that the kraft lignin precipitated by acidification may be converted into a liquefied product (polyol) by both methods of liquefying. And both the liquefaction under reflux and microwave, liquefied products have properties hydroxyl number and viscosity similar to the com-mercial polyols. Before the results obtained, it can be concluded that the polyols in kraft lignin (renewable) are potential candidates to replace petrochemical polyols in the formulation of polyurethane products. Thereby addingmore value kraft lignin (industrial waste) and generating more environmentally suitable products.