In-situ transesterification process for biodiesel production using spent coffee grounds from the instant coffee industry

Tuntiwiwattanapun, Nattapong; Monono, Ewumbua; Wiesenborn, Dennis P.; Tongcumpou, Chantra

doi:10.1016/j.indcrop.2017.03.019

Cited by 64 publications

(42 citation statements)

References 27 publications

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“…The oil extracted from SCG biomass was 12% of its dry matter, which is in the range of oil content in SCG. 17,18 The water content in SCG was 61%, which is similar to other researchers ndings. 21,29 The saponiable compounds of SCG composed of free fatty acid (0.7%), monoglycerides (0.14%), diglycerides (6.68%) and triglycerides (92.48%), while no unsaponiable compound was detected.…”

Section: Resultssupporting

confidence: 89%

“…16 Waste biomass, for example spent coffee grounds (SCG), has been identied as containing lipids in the range of 10-28%. 17,18 Utilization of SCG remains limited, such as for embankment ll material, 19 composting, and mushroom cultivation media. 20 Nescafe, the largest instant coffee producer, has used SCG as a fuel for their boilers in some factories.…”

Section: Introductionmentioning

confidence: 99%

“…21,22 The amount of SCG has increased every year as coffee is the favourite beverage in the world with 9.5 million ton consumed in 2016, 23 of which half was instant coffee. 17 Each gram of coffee could produce 0.65-0.91 gram of SCG depending on the brewing method and coffee species. 24,25 Hence, a proper waste management system is required to avoid environmental impact.…”

Section: Introductionmentioning

confidence: 99%

“…In situ transesterication of SCG is the most economical method to valorize waste SCG biomass through direct extraction and conversion of valuable oil to biodiesel. Tuntiwiwattanapun et al 17 demonstrated the direct biodiesel production from dry SCG using NaOH as catalyst, which generated 77% biodiesel yield in 3 h reaction time at 50 C. Scale up of the process was conducted to produce biodiesel which meets the ASTM standard. 17 In order to make the process more efficient, isopropanol as a cosolvent was used and could improve biodiesel yield to 89% in 2 h reaction time.…”

Section: Introductionmentioning

confidence: 99%

“…Tuntiwiwattanapun et al 17 demonstrated the direct biodiesel production from dry SCG using NaOH as catalyst, which generated 77% biodiesel yield in 3 h reaction time at 50 C. Scale up of the process was conducted to produce biodiesel which meets the ASTM standard. 17 In order to make the process more efficient, isopropanol as a cosolvent was used and could improve biodiesel yield to 89% in 2 h reaction time. 26 However, those studies used dry SCG biomass which requires a drying stage.…”

Section: Introductionmentioning

confidence: 99%

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Direct biodiesel production from wet spent coffee grounds

et al. 2019

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Utilization of waste spent coffee grounds (SCG) remains limited and requires pre-treatment before being discarded to avoid pollution to the environment. Lipids contained in SCG could be converted to biodiesel through an in situ transesterification method. Current in situ transesterification of wet SCG biomass, conducted at high reaction temperature to reduce the water effect and reduce reaction time, is energy intensive. A new approach, which combines simultaneous extraction-transesterification in a single step using soxhlet apparatus, was developed to produce biodiesel directly from wet SCG biomass. A homogeneous base catalyst at a concentration of 0.75 M showed better catalytic activity than acid, with hexane as a co-solvent on fatty acid (FA) extraction efficiency and FA to fatty acid methyl ester (FAME) conversion efficiency. Studying the factorial effect of ratio of methanol to hexane and reaction time led to the highest FA to FAME conversion efficiency of 97% at a ratio of 1 : 2 and 30 min reaction time. In addition, the catalyst could be used five times without losing its activity. In term of energy consumption, the reactive extraction soxhlet (RES) method could save 38-99% of energy compared to existing methods.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Direct biodiesel production from wet spent coffee grounds

et al. 2019

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Gewinnung von Fettsäuremethylestern aus industriellem Kaffeesatz mittels eines In‐situ‐Prozesses

Grän‐Heedfeld,

Kraft,

Fastabend

et al. 2024

Chemie Ingenieur Technik

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ZusammenfassungIn Kaffeesatz enthaltenes Kaffeeöl weist einen nennenswerten Anteil an ungesättigten Fettsäuren auf. In einem vom Bundesministerium für Bildung und Forschung (BMBF) geförderten Projekt wurde Kaffeesatz aus der industriellen Herstellung von Instant‐Kaffee für die Nutzung in der stoffverarbeitenden Industrie untersucht, wobei die Isolierung, Funktionalisierung und Nutzung der ungesättigten Fettsäuren einen Schwerpunkt darstellte. Durch einen In‐situ‐Prozess der Ver‐ und Umesterung wurden die im Kaffeesatz enthaltenen Fettsäuren in Form von Fettsäuremethylestern zugänglich gemacht.

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