A study of pyrolysis oil from soluble coffee ground using low temperature conversion (LTC) process

Pyrolysis of Douglas fir and coffee ground and product biocrude-oil characteristics

“…There is a tendency of the water content increasing with increasing reaction11 temperature possibly due to secondary reactions and the trend continues in this experiment with the 12 exception of 823 K.Lowest water content of 21.4 wt% was at 823 K which is the optimum reaction 13 temperature of product yield and highest HHV. As perFigure 5, for reaction temperatures of 67314 and 723 K the water content is about 21.6 wt% and for 773 K the water content increases to 23.0 15 wt% while dropping to the lowest point of 21.4 wt% at 823 K and rising to 873 K to a maximum16 level of 28.0 wt%. The lowest water content at the condition of highest HHV is consistent results generally indicate the complexity of pyrolysis liquid product, which resulted 22 from depolymerization and fragmentation reactions of cellulose, hemicellulose and lignin 23 components.…”

“…biocrude-oil is generally in solid state at room temperatures. A study of pyrolysis oil from soluble 6 coffee ground using low temperature conversion (LTC) process achieved a yield of 50 wt% with a 7 calorific value of 34.3 MJ/kg however earmarked for improvement onviscosity once again [16]. 8 Thus to overcome the drawbacks of individual pyrolysis mentioned above and improve the quality 9 of biocrude-oil, it was envisaged to study the effect of the mixture of the two biomass materials and 10 its product biocrude-oil.…”

“…The absorption frequency spectra were recorded and14 plotted for varying product biocrude-oil reaction temperature. The standard IR-spectra of15 hydrocarbons were used to identify functional groups of bio-oils at different reaction temperatures16 as per other studies[19,20].17 The effect of pyrolysis heating rates was studied under inert Nitrogen atmosphere using LECO 18 TGA701 Thermogravimetric Analyzer.Conversion ( ) is defined in Eq. 0 , W f and W t are the sample masses at the beginning, end at the specific time trespectively.21 values were controlled at 5, 10, 15 and 20 K/min and temperature range was from room 22 temperature to 1103 K. For each heating rate 3 crucibles of 2~3 g of 1:1 wt.…”

“…One of the objectives of this paper is to investigate the reaction temperature 15 effect on favourablebiocrude-oil yield through fast pyrolysis of the mixture and the present results16 were compared with fast pyrolysis of individual coffee ground and Douglas fir in this BFB reactor 17 and the results are presented inFigure 4. The mixture presents higher biocrude-oil yield to that of 18 individual pyrolysis of coffee ground and reaches the optimum biocrude-oil yield of 54%.Although 19 studies on Douglas fir have shown higher mass yields of around 60% [10-12] the product HHV has 20 been about 17 MJ/kg, thus establishing the success of this study on a acceptable mass yield 21 alongside a high HHV.…”

Evaluation of the performance of bio-oil obtained through pyrolysis of coffee waste

“…In turn, bio-oil ̶̶̶̶̶ ̶̶̶̶̶ ̶̶̶̶̶ ̶̶̶̶̶ ̶̶̶̶̶ is also referred as pyrolysis oil, wood liquids, condensed smoke, wood distillate or pyrolignal tar, among others (Rocha, 2004) ̶̶̶̶̶ ̶̶̶̶̶ ̶̶̶̶̶ ̶̶̶̶̶ ̶̶̶̶̶ is one of the most desired products of the three obtained by pyrolysis because of its high calorific power and its possible uses in fine chemistry, such as to produce hydrocarbons, fatty acids, aromatics and carboxylic acids (Romeiro et al, 2012). In the present work, the chemical composition and physical-chemical characteristics of the bio-oil obtained from the soft pyrolysis of coffee waste were studied, to enable transforming this residue into an economically viable material.…”