what is the mechanism of removal, which taking off lignin and hemicollulose from the lignocellulose through the method of acetic acid pretreatment ? thanks!
Please follow the attached thesis, I think it will answer your questions.
For separation of lignin and hemicellulose from cellulose, the biomass first needs to be extracted with a mixture of ethanol-toluene (2:1) to remove all hydrophobic and hydrophilic non-structural components. The material can be extracted by alkaline treatment followed by hydrogen peroxide treatment and ultrafiltration. The hemicellulose and lignin fraction can be recovered by precipitation or spray drying.
when acetic acid role as acid, acid hydrolysis of xylan is faster than other polysacchrides. Also part of lignin are degrade by acetic acid.