Solvent delignification of kenaf and sugar sorghum stems.

The chemical composition of stalks of kenaf and sugar sorghum was studied. Established that the kenaf and sugar sorghumstalks contain more cellulose, pentosans, minerals and less lignin than wood. The influence of main technological parameters on the quality indexes of organosolvent pulp obtained from kenaf and sugar sorghum stems was investigated. The possibility of bleaching organosolvent pulp obtained from stems of kenaf using hydrogen peroxide without chlorinecompounds to 80% whiteness was experimentally proved. The parameters of selectivity of lignin's dissolution byalkali-sulphite-alcohol delignification of kenaf and sugar sorghum stems were calculated. It was found that withincreasing temperature and duration of cooking, such selectivity indexes as degree of removal of carbohydrates and degree of delignification are increasing and selectivity index is decreasing. Efficiency of various representatives' delignification plant materials by means of diagrams depending on the content of pulp out there residual lignin was compared. Recommended use organosolvent pulp from kenaf and sorghum sugar stems for different types of cardboard and paper products. [ABSTRACT FROM AUTHOR]