An Efficient Method of Birch Ethanol Lignin Sulfation with a Sulfaic Acid-Urea Mixture.

For the first time, the process of birch ethanol lignin sulfation with a sulfamic acid-urea mixture in a 1,4-dioxane medium was optimized experimentally and numerically. The high yield of the sulfated ethanol lignin (more than 96%) and containing 7.1 and 7.

Sulfation of arabinogalactan with sulfamic acid under homogeneous conditions in dimethylsulfoxide medium.

Unlabelled: Sulfation of larch wood arabinogalactan (AG) with sulfamic acid in dimethylsulfoxide (DMSO) medium in the presence of urea was studied for the first time. The use of DMSO as a solvent instead of more toxic 1,4-dioxane allows to sulfate AG under homogeneous conditions. The sulfated AG with a high sulfur content (12.