title: Regeneration of cello-oligomers via selective depolymerization of cellulose fibers derived from printed paper wastes.
abstract: Cellulose extracted from printed paper wastes were selectively depolymerized under controlled conditions into cello-oligomers of controllable chain lengths via dissolution in an ionic liquid, 1-allyl-3-methylimidazolium chloride (AMIMCl), and in the presence of an acid catalyst, Amberlyst 15DRY. The depolymerization process was optimized against reaction temperature, concentration of acid catalyst, and reaction time. Despite rapid initial depolymerization process, the rate of cellulose depolymerization slowed down gradually upon prolonged reaction time, with 75.0 wt% yield of regenerated cello-oligomers (mean Viscosimetric Degree of Polymerization value of 81) obtained after 40 min. The depolymerization of cellulose fibers at 80 °C appeared to proceed via a second-order kinetic reaction with respect to the catalyst concentration of 0.23 mmol H3O(+). As such, the cellulose depolymerization process could afford some degree of control on the degree of polymerization or chain lengths of cello-oligomers formed.
authors.affiliation: Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia.
authors.forename: Lee Ken
authors.initials: LK
authors.lastname: Voon
authors.affiliation: Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia. Electronic address: suhcem@gmail.com.
authors.forename: Suh Cem
authors.initials: SC
authors.lastname: Pang
authors.affiliation: Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia.
authors.forename: Suk Fun
authors.initials: SF
authors.lastname: Chin
mesh_terms: D000498:Allyl Compounds / Q000737:chemistry*; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D010209:Paper; D058105:Polymerization; D011327:Printing; D012037:Refuse Disposal / Q000379:methods; D012997:Solvents / Q000737:chemistry
chemical_list: C544334:1-allyl-3-methylimidazolium; D000498:Allyl Compounds; D007093:Imidazoles; D052578:Ionic Liquids; D012997:Solvents; D002482:Cellulose
keywords: Acid catalyst; Cello-oligomers; Depolymerization; Ionic liquid; Paper cellulose