Recovery of Polyols from Polyurethane Foam Wastes by Solvent Decomposition

2019 2nd International Conference of Green Buildings and Environmental Management

生态环境科学

Li, Qi^1^2^3 ; Xu, Weitao^4 ; Xi, Enhua^1^3 ; Pang, Yanfang^1^3 ; Liu, Xiaosheng^1^3 ; Mao, An^1^2^3

Key Laboratory of State Forestry Administration for Silviculture of the Lower Yellow River, Shandong Agricultural University, Taian, Shandong

271018, China^1

Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing

100083, China^2

College of Forestry, Shandong Agricultural University, Taian, Shandong

271018, China^3

Planning and Design Institute of Forest Products Industry, State Forestry and Grassland Administration, Beijing

100010, China^4

关键词: Automobile shredder residue;    Chemical decomposition;    Decomposition reaction;    Diethylene glycol;    Effects of temperature;    Polyurethane foam wastes;    Polyurethane foams;    Solvent decompositions;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/310/4/042014/pdf
DOI  :  10.1088/1755-1315/310/4/042014

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The objective of this study was to investigate the feasibility of recovering the polyols from the polyurethane (PU) foam wastes obtained from automobile shredder residue (ASR) by chemical decomposition using the diethylene glycol (DEG) as the decomposing solvent and sodium hydroxide (NaOH) as the catalyst, respectively. The effects of temperature (180 °C and 210 °C), time (0.5, 1, 1.5, 2, 2.5, and 3 hours), and DEG/FPU weight ratio (2:1, 3:1, and 4:1) on the decomposition reaction and the properties of the recovered polyols were investigated. Higher temperature and DEG/FPU weight ratio promoted the FPU decomposition reaction and resulted in lower viscosity, higher hydroxyl number, and higher amine number of the recovered polyols. The hydroxyl number and amine number increased as the reaction progressed, while the viscosity decreased. Once the reaction was completed, little change was observed for the hydroxyl number and viscosity of the recovered polyols. The recovered polyol obtained at 210 °C and DEG/FPU weight ratio of 3:1 showed about the same length of time for the reaction, as well as the physical properties to that obtained at 180 °C and DEG/FPU weight ratio of 4:1.