Upcycling Polyurethane Plastics via Thermochemical Conversion Pathways: A Comparison of Hydrothermal Liquefaction and Pyrolysis Processes

被引:0
|
作者
Hartmann, Dale [1 ]
Rahman, Tawsif [1 ]
Carias, Lucila [2 ,3 ]
Auad, Maria L. [2 ,3 ]
Adhikari, Sushil [1 ,4 ]
机构
[1] Auburn Univ, Biosyst Engn Dept, Auburn, AL 36849 USA
[2] Auburn Univ, Dept Chem Engn, Ross Hall, Auburn, AL 36849 USA
[3] Auburn Univ, Ctr Polymers & Adv Composites, Gavin Engn Res Lab, Auburn, AL 36849 USA
[4] Auburn Univ, Ctr Bioenergy & Bioprod, Auburn, AL 36849 USA
来源
ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2024年 / 12卷 / 42期
基金
美国国家科学基金会;
关键词
thermoplastic polyurethane; hydrothermal liquefaction; pyrolysis; plastics; valorization; circular economies; reaction mechanism; THERMOPLASTIC POLYURETHANE; THERMAL-DEGRADATION; CYCLOPENTANONE; ANILINE; BIOMASS; WATER; MDI;
D O I
10.1021/acssuschemeng.4c05202
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Polyurethane is a plastic used in everyday applications in the form of foams, adhesives, coatings, or sealants and is predominantly landfilled. This study examined the liquid products formed through the thermochemical depolymerization of linear thermoplastic polyurethane pellets via both pyrolysis and hydrothermal liquefaction processes. The reaction temperatures investigated ranged from 250 to 550 degrees C and were based on thermogravimetric analysis of the feedstock. The pyrolysis of polyurethane at 550 degrees C produced the highest liquid yields (63.08 +/- 2.46 wt %) and also had the greatest energy recovery of 59.25%. Conversely, the highest oil yields for the hydrothermal liquefaction process occurred at 400 degrees C with 40.09 +/- 4.06 wt %. The hydrothermal liquefaction oil produced at 400 degrees C had the highest carbon content (70.37 +/- 4.00 wt %) and the lowest oxygen content (16.45%). The most valuable chemicals detected were aniline and p-aminotoluene, found predominantly in hydrothermal liquefaction oils. The highest aniline concentration (94.25 +/- 11.39 mg of aniline/g of sample) was measured for the 400 degrees C hydrothermal liquefaction oils. Hydrothermal liquefaction of thermoplastic polyurethane at 400 degrees C produced oil with the highest yield, carbon content, and aniline and p-aminotoluene concentrations. The extraction of aniline and p-aminotoluene for producing diisocyantes in conjunction with using biopolyols to produce a sustainable polyurethane polymer should be investigated to improve the circularity of the plastic industry.
引用
收藏
页码:15515 / 15527
页数:13
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