Thermochemistry of methyl and ethyl esters from vegetable oils

Osmont, Antoine; Catoire, L.; Gökalp, İskender

doi:10.1002/kin.20264

Cited by 59 publications

(29 citation statements)

References 27 publications

(29 reference statements)

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“…Using data provided in [52], the following approximation for the vapour heat capacities of the components of biodiesel fuels in the range of temperatures 300 ≤ T ≤ 1200 K is derived:…”

Section: Vapour Heat Capacitymentioning

confidence: 99%

Modelling of biodiesel fuel droplet heating and evaporation

Sazhin

Qubeissi

Kolodnytska

et al. 2014

Fuel

112

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Biodiesel fuel droplet heating and evaporation is investigated using the previously developed models, taking into account temperature gradient, recirculation, and species diffusion within droplets. The analysis is focused on four types of biodiesel fuels: Palm Methyl Ester, Hemp Methyl Esters, Rapeseed oil Methyl Ester, and Soybean oil Methyl Ester. These fuels contain up to 15 various methyl esters and possibly small amounts of unspecified additives, which are treated as methyl esters with some average characteristics. Calculations are performed using two approaches: 1) taking into account the contribution of all components of biodiesel fuels (up to 16); and 2) assuming that these fuels can be treated as a one component fuel with averaged transport and thermodynamic coefficients. It is pointed out that for all types of biodiesel fuel the predictions of the multi-component and single component models are rather close (the droplet evaporation times predicted by these models differ by less than about 5.5%). This difference is much smaller than observed in the case of Diesel and gasoline fuel droplets, and is related to the 1 Corresponding author, e-mail: S.Sazhin@brighton.ac.uk Preprint submitted to FuelMarch 28, 2013 fact that in the case of Diesel and gasoline fuel droplets the contribution of components in a wide range of molar masses and enthalpies of evaporation needs to be taken into account, while in the case of biodiesel fuels the main contribution comes from the components in a narrow range of molar masses and enthalpies of evaporation. As in the case of Diesel and gasoline fuel droplets, the multi-component model predicts higher droplet surface temperature and longer evaporation times than the single component model.

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“…Using data provided in [52], the following approximation for the vapour heat capacities of the components of biodiesel fuels in the range of temperatures 300 ≤ T ≤ 1200 K is derived:…”

Section: Vapour Heat Capacitymentioning

confidence: 99%

Modelling of biodiesel fuel droplet heating and evaporation

Sazhin

Qubeissi

Kolodnytska

et al. 2014

Fuel

112

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“…In contrast, the specific heat, enthalpy and entropy polynomials of temperature of the four methyl esters, required as inputs to the program, were fitted from the data reported in Osmont et al, (2007), which were derived from quantum chemistry theory using the anharmonic oscillator approximation.…”

Section: Thermodynamic Equilibrium Calculationsmentioning

confidence: 99%

Steam reforming of crude glycerol with in situ CO2 sorption

Dou

Rickett

Dupont

et al. 2010

Bioresource Technology

120

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Steam reforming of the crude glycerol by-product of a biodiesel production plant has been evaluated experimentally at atmospheric pressure, with and without in-situ CO 2 sorption, in a continuous flow fixed-bed reactor between 400 and 700 °C. The process outputs were compared to those using pure glycerol. Thermodynamic equilibrium calculations were used to assess the effect on the steam reforming process of the main crude impurities (methanol and four fatty acid methyl esters). The crude glycerol and steam conversions and the H 2 purity reached 100%, 11% and 68% respectively at 600 °C. No CH 4 was found at and above 600 °C. Steam reforming of crude glycerol with in-situ CO 2 removal is shown to be an effective means of achieving hydrogen purity above 88% in pre-CO 2 breakthrough conditions.

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“…They were performed for atmospheric pressure at the mid-reactor temperature measured in the experiments. The polynomials of temperature of the specific heat, enthalpy and entropy of the fatty acids, required as programme inputs, were fitted from the data reported in Osmont et al (2007). The latter were derived from quantum chemistry theory using the anharmonic oscillator approximation.…”

Section: Thermodynamic Equilibrium Calculationsmentioning

confidence: 99%

Chemical looping reforming of waste cooking oil in packed bed reactor

Pimenidou

Rickett

Dupont

et al. 2010

Bioresource Technology

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Chemical looping steam reforming for hydrogen production from waste cooking oil was investigated using a packed bed reactor. The steam to carbon ratio of 4 and temperatures between 600 and 700 °C yielded the best results of the range of conditions tested. Six cycles at two weighted hourly space velocities (WHSV of 2.64 and 5.28 hr -1 ) yielded high (>0.74) and low (<0.2) oil conversion fractions respectively, representing low and high coking conditions. The WHSV of 2.64 hr -1 yielded product concentrations closest to equilibrium values calculated assuming a fresh rapeseed oil composition. Repeated cycling revealed some output oscillations in reactant conversion and in the extent of Ni-NiO conversion, but did not exhibit deterioration by the 6 th cycle. The selectivity of CO, CO 2 and CH 4 were remarkably constant over the performed cycles, resulting in a repeatable syngas composition with H 2 selectivity very close to the optimum.

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Thermochemistry of methyl and ethyl esters from vegetable oils

Cited by 59 publications

References 27 publications

Modelling of biodiesel fuel droplet heating and evaporation

Modelling of biodiesel fuel droplet heating and evaporation

Steam reforming of crude glycerol with in situ CO2 sorption

Chemical looping reforming of waste cooking oil in packed bed reactor

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