Abstract: Oxygen-delignified wheat straw soda pulp were pretreated by ethylenediamine(EDA) and then dissolved in 8%LiCl/DMSO solution system. The effects of ethylenediamine on the pulp properties and its dissolution-regeneration performance in LiCl/DMSO were studied. The results showed that the crystal structure of EDA pretreated pulp was altered but still had a high crystallinity. The EDA-pretreated wheat straw pulps could be completely dissolved in 8%LiCl/DMSO. With the increase of the lignin content, more time was required to form the homogeneous solution. The dissolved samples could be regenerated by being poured into water. The yields of the regenerated fractions were ranged from 59.19% to 61.88%. The lignin, polysaccharide, ash, and silicon were preserved well after the dissolution-regeneration.

Key words: ethylenediamine(EDA), LiCl/DMSO, lignocellulosic solvent