Co-pyrolysis of coffee-grounds and waste polystyrene foam: Synergistic effect and product characteristics analysis. (15th May 2021)

• Record Type: Journal Article
• Authors: Van Nguyen, Quynh; Choi, Yeon-Seok; Choi, Sang-Kyu; Jeong, Yeon-Woo; Han, So-Young
• Is Part Of: Fuel. Volume 292(2021)
• Publication Date: 2021-05-15
• Subjects: Co-pyrolysis -- Coffee-grounds -- Waste polystyrene foam -- Bio-oil -- Bubbling fluidized bed reactor; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2021.120375
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: Coffee-grounds (CFs) were simultaneously pyrolyzed with waste polystyrene foam (PS) in Bubbling Fluidized Bed Reactor. The CFs/PS blending ratio of 1:3 has revealed the strongest synergistic effect interaction. GCMS analysis has shown that CFs/PS co-pyrolysis enhanced the production of aromatic compounds. Thermogravimetric analysis has also shown the co-pyrolysis interaction. Abstract: Coffee-grounds (CFs) are simultaneously pyrolyzed with waste polystyrene foam (PS) in a bubbling fluidized bed reactor according to the following conditions: a temperature of 500 °C selected from the thermogravimetric analyses of CFs and PS, the nitrogen flow rate of about 20–25 L/min., and the feeding rate of 200 g/h. Multiple CFs/PS mixing ratios were treated as follows: 75:25, 50:50, 25:75. The properties, the chemical compositions of the co-pyrolysis oils and the yields of the products were compared with those of the pyrolysis-oils of the individual feedstocks to demonstrate the synergy between the CFs and the PS. The synergy with the co-pyrolysis produced a higher liquid yield than the calculated amount. The higher heating value of co-pyrolysis oils increased to 39.66 MJ/kg, which was equivalent to that of conventional fuels. Blending at least 25% of PS to CFs could greatly reduce the viscosity of CFs pyrolysis oil (from 724.65cP to 29.3cP at 24 °C). Chemical distributions have shown that the synergy effect between CFs and PS has drastically enhanced the production of hydrocarbons, especially in aromatic compounds.