Browsing by Author "Nair, Jayashri N."

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    Impact of Tamarindus Indica biodiesel blends on performance and exhaustemissions characteristics of light duty compression ignitionengine
    (Materials Today: Proceedings, 2021) Nair, Jayashri N.; Satyanarayana Murthy, Y. V. V.
    Tamarind (Tamarindus Indica) is an integral part of South Indian cuisine. Its pulp is used to add sourness to southIndian curries. However tamarind seeds which are having a considerable amount of lipid in it are thrown away. Ourmain objective is to produce Tamarind biodiesel (TB) from tamarind seed oil and investigate its effect onperformance and exhaust emissionsof CI engine. Oil was extracted from Tamarind seeds and was converted to biodiesel by transesterification process with NaOH as catalyst. Tests were performed using TB5, TB10, TB15 blendswith 1500 rpm rated speed and compression ratio of18. The performance test results revealed that BTE of B15 wasgreater in comparison to other blends as well as diesel . However BSFC for TB blends were greater compared to neat diesel . Considerable reductions in exhaust emissions were observed with TB blends. TB10 showed apical reductionof 27% in CO and 15% reduction in smoke. TB5 showed 25% HC reduction followed by TB10 with 19.25% reductions.TB15 showed 19.36% of highest NOx reduction followed by TB10 with 10.7% NOx reduction. TB10 proved to giveoptimum test results for performance and emissions. From the results it can be concluded that TB can be consideredas a viable option for biodiesels.
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    Transesterification of Algae Oil using K2CO3/ZnO Heterogeneous Base Catalyst
    (ASIAN JOURNAL OF CHEMISTRY, 2019) Nair, Jayashri N.; Satyanarayana Murthy, Y. V. V.; Chaitanya, N. S. C.; Ramsh, M.
    The objective of the present work was to develop a heterogeneous base catalyst K2CO3/ZnO for transesterification of algae oil. This catalyst was prepared by wet impregnation method calcinated at high temperature of 600 °C. The catalyst was characterized by X-ray diffraction technique. The crude algae oil was degummed and its free fatty acid was reduced to 2 % by methanol treatment. Methanol was used to convert triglycerides to biodiesel using K2CO3/ZnO. The doping of 30 % K2CO3 on ZnO calcined at 600 °C was studied on biodiesel yield. The reaction parameters such as temperature, stirring rate, amount of catalyst, methanol to oil molar ratio on the yield of fatty acid methyl ester were investigated. Highest yield was obtained for 7 % catalyst, 9:1 methanol to molar ratio at 80 °C for 30 % K2CO3/ZnO. This study proved that the catalyst loading less than 5 % was unsuccessful in biodiesel yield. The physio-chemical properties of the produced algae biodiesel was determined as per ASTM test procedures.