STUDY OF SURFACTANTS EFFECT ON PULP PROPERTIES

The effects of various surfactants have been considered on soda pulping of three lignocellulosic materials. So, wheat straw, populous and forest hardwood mixture has been cooked with and without surfactant based as soda method. In order to evaluate the surfactants effects, pulp properties including the screen yield and kappa value have been measured. The results showed that in case of wheat straw and populus pulping, it has not seen any remarkable effect on kappa number, but the pulp yield improved and the screen rejects has been approximately vanished. In case of forest hardwood mixture, a different trend has been observed; so that in successive replicates of control pulping, a variety of amounts has been observed for the pulp yield and kappa value. As a matter of fact, it is not logical to expect a constant amount for yield, kappa number. In fact, different ratio of species with different amounts of lignin and holocellulose would cause not to obtain an approximate constant amount of the yield and kappa number in successive replicates. However, the positive effects of surfactant application including yield improvement and kappa reduction have been observed in this case, too.

Keywords:

Wheat straw , populus , hardwood mixture , kappa number , Yield , Surfactant