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Engine Testing and Analysis of Cetane Improvers in Biodiesel Stability

This report details the ongoing engine testing conducted by Kapila Wadumesthrige and collaborators, with a total run time of 292 hours. So far, 205 hours of testing has been completed at 30 kW, with about 35 hours remaining. The study investigates the effects of various cetane improvers, like 2-ethyl-hexyl nitrate and di-tert-butyl peroxide, on the oxidation stability of biodiesel. Findings suggest an interaction between antioxidants and cetane improvers that could affect the stability of biodiesel blends. Continuous analysis of lube oil and fuel injector durability is also being performed.

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Engine Testing and Analysis of Cetane Improvers in Biodiesel Stability

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  1. Research Updates Kapila Wadumesthrige 03/04/08

  2. Engine testing(Kapila, Sidong, Mark and Nick) • Total run time = 292 hrs • Total testing time ( 30 kW (60% of Full Load, ULSD) = 205 hrs • 35 hrs of testing remaining ( 4 days) • 500 gallon tank empty • Need about 50 gallons of ULSD • Clean fuel tank for S8 • Continuous Lube oil analysis • Metal analysis • Fuel Injector system durability testing

  3. Effect of Cetane improvers on oxidation stability of Biodiesel • Antioxidants and cetane improvers act against each other • Cetane improvers in B20 (ULSD) may help oxidize biodiesel and degradation of antioxidants • Received two cetane improvers • 2-ethyl-hexyl nitrate (EHN) • di-tert-butyl peroxide (DTBP)) • Stability of antioxidants in the presence of cetane improvers

  4. ICP testing • All metal standards and solvents received • Compressed air line installed (Mark & Danton) • Methods for Biodiesel and Lube oil analysis

  5. AOCS Abstract 1 Properties of Modified Fatty Acid Methyl Esters Kapila Wadumesthrige, Mark Winston-Galant, Sidong Zeng, Steven O. Salley, K. Y. Simon Ng 1. Modification of double bonds Hydrogenation (higher Ox stability, Low flow properties) -HC=CH- -CH2-CH2- 0.4 wt% Ni, 5.0 wt% H2 400 kPa pressure, 160 C temperature

  6. Hydroxylation -HC=CH- -CH(OH)-CH(OH)- Alkaline KMnO4,, 70-90 C • Epoxidation -HC=CH- -CH-(O) -CH-

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