PROCESS FOR SIMULTANEOUS EXTRACTION OF LIGNIN AND SILICA, LIGNIN AND SILICA MIXTURE, USE OF A LIGNIN AND SILICA MIXTURE AND ELASTOMER

摘要

the invention relates to a process for the simultaneous extraction of lignin and silica from lignocellulosic plant material characterized by the fact that it comprises the steps of: a) fractioning the lignocellulosic plant material in the presence of an acidic solution, in order to obtaining a solid fraction comprising cellulose, residual lignin and silica; b) simultaneously extract lignin and silica from the solid fraction obtained in step a) with a basic solution, at a pH between 10 and 13 and at a temperature between 70 ° C and 90 ° C, in order to obtain a liquid phase comprising lignin and silica and a solid phase; c) separate the liquid phase from the solid phase obtained in step b), d) coprecipitate a mixture of lignin and silica formed in the liquid phase, at a pH between 5 and 6.