Preparation Of Microcrystalline Cellulose From The Residue Of Xylitol Extraction And Research On Adsorption Performance Of Cellulose Quaternary Ammonium

In industry, corn cobs are wildly used as materials to extract xylitol,producing large amounts of waste residues which have not yet been utilizedefficiently. In my research, xylitol extraction waste, as raw material, is treatedwith alkali to remove lignin and recover cellulose nanoparticles andmicrocrystals, with cellulose complexing agent as the product, which is madefrom cellulose microcrystals and can be used into the separation process ofacidic polysaccharides； meanwhile, Alkali and lignin can be recovered fromthe black liquor produced by alkaline treatment. My research has theory valueand practical significance and will provide an effective approach for thecomprehensive utilization of extraction waste of xylitol.Firstly, we take xylitol extraction waste as raw material, and combine aprocess flow of removing lignin by alkaline treatment, bleaching withperoxide in alkaline circumstance, vacuum drying, crushing and filtering inorder to acquire cellulose microcrystals. Then, cellulose microcrystals are usedinto the preparation of nanoparticles. The mass amount of black liquor produced in the process of alkalinetreatment for removing lignin contains high concentration of alkali andorganic matter and is dark in color. If it’s discarded into the environment, notonly will it cause heavy pollution but also a waste of alkali and lignin. In thisarticle, the method of lignin extracting is Alkali out, and the alkali liquor hasbeen reused.We take use of3-Chloro-2-hydroxypropyltrimethyl ammoniumchloride(CHPTAC) as etherification modifier to treat cellulose microcrystalsin order to form cellulose complexing agent(cellulose quaternary ammonium)which contains quaternary ammonium group, thus carries positive charge inwater solution, and is capable of forming complex with acidmucopolysaccharide carrying negative charge such as hyaluronic acid in lowsalt concentration water solution, and the complex breaks down in high saltconcentration water solution. Due to such property, it’s possible to separateand purify acidic polysaccharides.