Biodiesel Quality, Standards and Properties

A Comparative Study on the Cleaner Production Options for Fishery Wastes around Lake Tana

“…Biodiesel with high IV tends to polymerize and form deposits on injector nozzles, piston rings and piston ring grooves. The tendency of polymerization increases with the degree of unsaturation of the fatty acids [11,12]. This suggests that the quality of biodiesel produced in this work was in good agreement with the other literature results.…”

“…As it can be seen in Table 2, CN was found in the range of 33 -80. Researchers reported that the appropriate CN is in the range of 15-100 [11]. So it is important to conclude that the CN investigated in this study was in a good agreement with literature results.…”

“…The IV is a measurement of total unsaturation of fatty acids measured in g iodine/100 g of biodiesel sample, when formally adding iodine to the double bonds [10,11]. As it can be seen in Table 2 the iodine value of the produced biodiesel was in the range of 26.4-220gram of I 2 /100ml of oil.…”

“…Different researchers reported that the iodine value highly depends on the nature and ester composition of the feed stocks used in biodiesel production. Therefore the IV is limited in various regions of the world depending on the specific conditions: 120 in Europe and Japan, 130 in Europe for biodiesel as heating oil, 140 in South Africa, in Brazil it is not limited and in the U.S., Australia and India it is not included in the quality standard (it would exclude feed stocks like sunflower and soybean oil) [11]. Biodiesel with high IV tends to polymerize and form deposits on injector nozzles, piston rings and piston ring grooves.…”

Microalgal Species Selection for Biodiesel Production Based on Fuel Properties Derived from Fatty Acid Profiles

“…Oxidative stability is a very important biodiesel criterion, as it results in the formation of gums, sedimentation and engine deposits and increases the viscosity of the fuel through the formation of allylic hydroperoxides and several secondary oxidation products such as aldehydes, alcohols and carboxylic acids [18]. Oxidative stability is influenced by the age of the biodiesel, the condition of storage and the degree of unsaturation of biodiesel FAMEs and can be improved by the addition of antioxidants [19]. Oxidative degradation is, however, additionally influenced by the FAME components with the presence of allylic and particularly bis-allylic double bond positions leading to greater oxidative instability [18].…”