Paucidisperse lignosulphonates, previously described as a distinct group of compounds called" hemilignins" were conclusively shown to be a complex mixture of monomeric (C9) sulphonic acids. Since these compounds are rapidly solubilized only during the early stages of delignification from softwoods (≤ 30% lignin removal), it can be concluded that they are selectively removed from the secondary wall and not from the middle lamella. This result ...
