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51315-5540-Effect of Total Acidity and Water Content on Ethanol Corrosiveness (E100)

Product Number: 51315-5540-SG
ISBN: 5540 2015 CP
Author: Anna Moreira
Publication Date: 2015
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The objective of this work was to study the effect of the total acidity and of the water content on the corrosiveness of fuel ethanol. With this purpose a specific laboratory immersion test methodology was developed. To reach the goals different ethanol samples were used to prepare the test medium. At the first part of the study ethanol samples with different total acidity values were produced by adding acetic acid in different quantities or by injecting an inert gas (pure nitrogen or nitrogen/carbon dioxide mixtures with three different CO2 contents (1 % 5 % and 15%)). The second part of the study was conducted using the ethanol samples in received condition (anhydrous ethanol) and after water addition (hydrated ethanol). The ethanol hydration was made by adding 5 % (m/m) of ultrapure water. The Brazilian specification ANP[1] n. 36 (water content varying between (6.2 e 7.4) % (m/m) for Brazilian fuel ethanol E100) was used for the establishment of the mentioned water content considering the fact that anhydrous ethanol already has a small amount of water. Based on the results obtained it was concluded that the acidifying method and the initial corrosiveness of the ethanol are factors that present greater influence than the acidity value by itself. Additionally it was verified that the water content increases the ethanol's corrosiveness.[1] ANP – National Agency of Petroleum Natural Gas and Biofuels (Agência Nacional do Petróleo Gás Natural e Biocombustíveis)

The objective of this work was to study the effect of the total acidity and of the water content on the corrosiveness of fuel ethanol. With this purpose a specific laboratory immersion test methodology was developed. To reach the goals different ethanol samples were used to prepare the test medium. At the first part of the study ethanol samples with different total acidity values were produced by adding acetic acid in different quantities or by injecting an inert gas (pure nitrogen or nitrogen/carbon dioxide mixtures with three different CO2 contents (1 % 5 % and 15%)). The second part of the study was conducted using the ethanol samples in received condition (anhydrous ethanol) and after water addition (hydrated ethanol). The ethanol hydration was made by adding 5 % (m/m) of ultrapure water. The Brazilian specification ANP[1] n. 36 (water content varying between (6.2 e 7.4) % (m/m) for Brazilian fuel ethanol E100) was used for the establishment of the mentioned water content considering the fact that anhydrous ethanol already has a small amount of water. Based on the results obtained it was concluded that the acidifying method and the initial corrosiveness of the ethanol are factors that present greater influence than the acidity value by itself. Additionally it was verified that the water content increases the ethanol's corrosiveness.[1] ANP – National Agency of Petroleum Natural Gas and Biofuels (Agência Nacional do Petróleo Gás Natural e Biocombustíveis)

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