Co-pyrolysis of paper mill sludge and spend coffee ground using CO2 as reaction medium

Production and Characterization of the Bio-Oil Obtained by the Fast Pyrolysis of Spent Coffee Grounds of the Soluble Coffee Industry

“…For this reason, in recent years several studies indicate SCG as a promising biomass for industrial or energy purposes, due to its lignocellulosic composition, pleasant smell and the high heating value in relation to other biomasses. [6][7][8][9][10][11] According to Roy and Dias, 12 pyrolysis is the most applied thermo-chemical process in the conversion of a biomass, where the degradation of the biomass occurs in an atmosphere free of oxygen, under high temperatures, producing biochar (charcoal), bio-oil (pyrolytic liquid) and gases. [13][14][15] The yield of each of these products is directly related to the type of pyrolysis chosen, with fast pyrolysis being recommended for a higher liquid yield.…”

Thermo-Catalytic Reforming of spent coffee grounds

“…The spent coffee grounds are the residual waste that remain after using the coffee beans through dehydration, milling and brewing. Around 50% of SCG worldwide are produced industrially, and the remaining 50% are generated domestically (Blinová et al 2017;Cho et al 2017;Karmee 2018;Kelkar et al 2015;Kim et al 2017;Li et al 2014;Scully et al 2016; United States Department of Agriculture 2018).…”

“…Spent coffee grounds are valuable as biomass feedstock for bio-fuels and bio-refinery production (Li et al 2014), due to the high organic compounds in it, such as fatty acids, lipid, cellulose, hemicellulose, lignin, carbohydrate, and nitrogen containing compounds (Cho et al 2017;Karmee 2018). Consequently, there is a great interest in the conversion of spent coffee grounds through thermochemical processes into a syngas, bio-oil, biodiesel, or bioethanol, and char (Bok et al 2012;Galanakis 2017;Karmee 2018;Tsai et al 2012).…”

“…The pyrolysis as a thermochemical conversion technique is a promising technology and has a great potential as an alternative treatment process for biodegradable wastes. Pyrolysis provides a better conversion rate of feedstock into bio-oil, gas and solid fuel, with a high feed to bio-fuels efficiency, that could be developed worldwide as a bio-fuel and bio-chemical resource (Cho et al 2017;Daschner et al 2016;Hornung et al 2011;Li et al 2014;Tsai et al 2012).…”

“…While, the catalyst causes significantly increasing in the hydrogen concentration and a reduction in the C x H y . From the mass balance point of view, the catalyst encourages the conversion and cracking of bio-oil into non-condensable gases, which leads to a reduction in bio-oil yield and increasing in non-condensable gases yield (Cho et al 2017;Kan et al 2014).…”