Tag Archives: MTBE

550-557 V. Hönig,, Z. Linhart, J. Táborský and J. Mařík
Determination of the phase separation temperature and the water solubility in the mixtures of gasoline with biobutanol and bioethanol
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Determination of the phase separation temperature and the water solubility in the mixtures of gasoline with biobutanol and bioethanol

V. Hönig¹,*, Z. Linhart², J. Táborský¹ and J. Mařík³

¹Czech University of Life Sciences Prague, Faculty of Agrobiology, Food and Natural Resources, Department of Chemistry, Kamycka 129, CZ16521, Prague 6, Czech Republic; *Correspondence: honig@af.czu.cz
²Czech University of Life Sciences Prague, Faculty of Economics and Management, Department of Management, Kamycka 129, CZ16521, Prague 6, Czech Republic
³Czech University of Life Sciences Prague, Faculty of Engineering, Department for Quality and Dependability of Machines, Kamycka 129, CZ16521, Prague 6, Czech Republic

Abstract:

Original hydrocarbon composition, volatility, compatibility with materials, calorific value and stability of the mixture in the presence of water are monitored usually. This paper deals with the stability of gasoline-biobutanol and gasoline-bioethanol mixtures in the presence of water. Biobutanol is better biofuel than bioethanol using the same raw materials. Different contents of alcohol and oxygenated cosolvents are evaluated. Experimental analysis are focused on the water solubility and phase stability. Solubility in water of butanol and ethanol mixtures is very similar. Butanol-gasoline mixture provides better phase stability upon contact with water or atmospheric moisture oppose to ethanol mixtures. Butanol also does not enter to the aqueous layer and fuel properties remain in phase separation preserved. Further, it was found that crystals occur at low temperatures after exclusion of water was seen. Moreover, the temperature of phase separation can affect the content of alcohol, water, hydrocarbon composition and cosolvents added. The only difference found between more beneficial butanol and less beneficial ethanol was ABE (Aceton–Butanol–Ethanol) fermentation with Clostridium Acetobutylicum allowing to ferment also saccharidic cellulose to biobutanol according to standard of second generation biofuels.

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558-567 V. Hönig,, M. Orsák, M. Pexa and Z. Linhart
The distillation characteristics of automotive gasoline containing biobutanol, bioethanol and the influence of the oxygenates
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The distillation characteristics of automotive gasoline containing biobutanol, bioethanol and the influence of the oxygenates

V. Hönig¹,*, M. Orsák¹, M. Pexa² and Z. Linhart³

¹Czech University of Life Sciences Prague, Faculty of Agrobiology, Food and Natural Resources, Department of Chemistry, Kamycka 129, CZ16521, Prague 6, Czech Republic; *Correspondence: honig@af.czu.cz
²Czech University of Life Sciences Prague, Faculty of Engineering, Department for Quality and Dependability of Machines, Kamycka 129, CZ16521, Prague 6, Czech Republic
³Czech University of Life Sciences Prague, Faculty of Economics and Management, Department of Management, Kamycka 129, CZ16521, Prague 6, Czech Republic

Abstract:

Bioethanol and fatty acid methyl esters are a regular part of the production of gasoline and diesel fuels, although in limited quantities. Introduction of bioethanol as part of automobile gasoline was associated with high production costs, technical and logistical problems. This article analyses changes of distillation curve of biobutanol and isobutanol as an alternative to bioethanol. Added alcohol to gasoline causes reduction of boiling point due to the formation of azeotrope. This phenomena of distillation curve are called Plato effect. Therefore, ethers (MTBE and ETBE) are added to fuel to affect the most central part of distillation curve. Especially, to decrease the distillation temperature oppose to gasoline without oxygenates of wide range of distilled volume. This article replaces simple universal models predicting properties of alcohol-gasoline mixtures. It was found that mixture of ETBE with bioethanol in gasoline the distillation curve summarise its effects. Butanol and MTBE influence distillation curve of gasoline only in values of its boiling points. Therefore, butanol is mixable with all listed fuel components without any additional addaptations.

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568-576 V. Hönig, M. Orsák and J. Táborský
The analysis of the influence of biobutanol and bioethanol mixture with ethers on the vapour pressure of gasoline
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The analysis of the influence of biobutanol and bioethanol mixture with ethers on the vapour pressure of gasoline

V. Hönig*, M. Orsák and J. Táborský

Czech University of Life Sciences Prague, Faculty of Agrobiology, Food and Natural Resources, Department of Chemistry, Kamycka 129, CZ16521 Prague 6, Czech Republic; *Correspondence: honig@af.czu.cz

Abstract:

In addition to widely known species automotive fuels that are currently on the market, there are many other chemicals which are used or can be used as fuels or fuel components for current automotive internal combustion engines. Implementation of such ingredients car brings a number of technical problems. The vapour pressure is the pressure in the system in which they are at a certain temperature gaseous and liquid phases in equilibrium. The addition of alcohols such as gasoline constituents significantly affects the volatility of the resulting mixture. The article is focused on assessing the addition of biobutanol as n–butanol or isobutanol vapour pressure compared to the already commonly used in bioethanol. Also included is the possibility to use ethers for influencing the vapour pressure of the resulting mixture. Part of the experiment is to assess the influence of the quantity and type of oxygenates and composition of gasoline. Based on the measured data it is clear that addition of alcohol to gasoline create complications. Effect biobutanol as possible alternatives is different than bioethanol. It is therefore necessary to take into account the influence of alcohol, even at low concentrations corresponding to the limit according to standard EN 228. Biobutanol compared bioethanol can be used as 100% fuel. For the low vapour pressure of the fuel experiment also aims to increase its value using pentane.

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