The effective use of prehydrolysis liquor (PHL), from the kraft-based dissolving pulp production process, may fit into the concept
of integrated forest biorefinery (IFBR). The dissolved organics in the PHL include hemicelluloses, lignin, acetic acid, furfural and
extractives. Adsorption of hemicelluloses and lignin onto the neutral sulphite semichemical (NSSC) pulp fibres may be a potential
method of utilizing the dissolved organics in the PHL. The principal goal of this work was to study the adsorption of lignocelluloses of
PHL onto the NSSC pulp fibres. In addition to the typical process variables, the effect of using polymers, such as coagulant and flocculant,
on increasing the adsorption, was investigated.
The effects of time and temperature were examined. It was shown that adsorption reached its maximum almost in 1 h. Also, it was demonstrated
that a higher temperature improved the adsorption. Furthermore, the use of cationic polymers, such as polydiallyl dimethyl
ammonium chloride (PDADMAC), a coagulant (Nalkat 2020) and flocculant (Ultimer 1470), could enhance the adsorption of lignocelluloses
from PHL onto NSSC pulp fibres. The maximum lignin and hemicelluloses adsorption was 160 mg/g and 320 mg/g onto pulp (58%
and 22% removal from PHL), respectively.
It is concluded that lignocelluloses of the PHL can be adsorbed onto NSSC pulp fibres so as to work as papermaking additives; and typical
polymers, such as coagulant and flocculant, can be used to enhance the lignocelluloses adsorption.