Abstract
The oil fractions, extracted under different conditions from spent coffee grounds, were used to produce biodiesel fuels and investigate their FAME profiles. For producing of fuels, esterification and transesterification of oils with homogeneous catalysts were applied. Investigation of the esters composition (FAME) in biodiesel is carried out by modified gas chromatographic method EN 14103. The content of each individual ester was calculated using the method of internal standard. The results of total and individual FAME content in all studied objects are shown. The results show the feedstocks and extraction conditions (catalysts, temperatures) for obtaining the biodiesel with high yield and balanced composition.
Highlights
Biodiesel is defined as a fuel comprised of monoalkyl esters of long – chain fatty acids derived from vegetable oils, animal fats, waste cooking oil, algae and waste organic materials [1,2]
We have previously developed a method for oil extraction from spent coffee grounds [31] and applied this method in the study
Spent coffee grounds were used as raw material for biodiesel production
Summary
Biodiesel is defined as a fuel comprised of monoalkyl esters of long – chain fatty acids derived from vegetable oils, (sunflower, rapeseed, soy, palm), animal fats, waste cooking oil, algae and waste organic materials [1,2]. The benefits of biodiesel as fuel have been extensively studied and described in a large number of scientific papers. Biodiesel has a higher cetane number (about 60 to 65) than diesel oil (53) and contains 10 - 11% oxygen, which contributes to its better burning [7]. It has good lubricating properties, it reduces corrosion and wear and increases overall engine efficiency [8]. Biodiesel can be successfully used in blends with petroleum diesel up to 20% (B20) without engine modifications. One of the main advantages of the biodiesel is that it reduces dependence on imported oil as local inputs
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