title: Acetone-soluble cellulose acetate extracted from waste blended fabrics via ionic liquid catalyzed acetylation.
abstract: Isolation of cellulose from waste polyester/cotton blended fabrics (WBFs) is a bottleneck for recycling and exploiting waste textiles. The objective of this study was to provide a new environmental-friendly and efficient approach for extracting cellulose derivatives and polyester from WBFs. A Bronsted acidic ionic liquid (IL) N-methyl-imidazolium bisulfate, [Hmim]HSO4, was used as a novel catalyst for acetylation of cellulose rather than a solvent with the aim to overcome low isolation efficiency associated with the very high viscosity and relatively high costs of ILs. The extraction yield of acetone-soluble cellulose acetate (CA) was 49.3%, which corresponded to a conversion of 84.5% of the cellulose in the original WBFs; meanwhile, 96.2% of the original poly(ethylene terephthalate) (PET) was recovered. The extracted CA was characterized by (1)H NMR, FTIR, XRD and TGA analysis, and the results indicated that high purity acetone-soluble CA and carbohydrate-free PET could be isolated in this manner from WBFs.
authors.affiliation: State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.
authors.forename: Xunwen
authors.initials: X
authors.lastname: Sun
authors.forename: Canhui
authors.initials: C
authors.lastname: Lu
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Dong
authors.initials: D
authors.lastname: Tian
authors.forename: Xinxing
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000096:Acetone / Q000737:chemistry*; D000107:Acetylation; D002384:Catalysis; D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry; D032561:Cotton Fiber; D055772:Green Chemistry Technology; D007093:Imidazoles / Q000737:chemistry; D007220:Industrial Waste; D052578:Ionic Liquids / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry; D012995:Solubility; D013696:Temperature; D013784:Textiles; D018505:Waste Management
chemical_list: D007093:Imidazoles; D007220:Industrial Waste; D052578:Ionic Liquids; D011091:Polyesters; D000096:Acetone; C005062:acetylcellulose; C029899:imidazole; D002482:Cellulose
keywords: Acetone-soluble cellulose acetate; Acetylation; Catalyzing; Ionic liquid; Separation; Waste polyester/cotton blended fabrics