CONTRIBUTION TO DETERMINATION OF DENSITY AND ALCOHOLIC CONTENT IN MIXTURES ETHANOL-WATER IN BRAZIL

摘要

Ethanol is one of the most important Brazilian export goods and its international market is growing strong, mainly because of a number of measures taken by several countries in order to reduce environmental pollution, for example, adding amounts of ethanol into regular gasoline or even using pure ethanol-moved motors. Quality assurance of ethanol is becoming more and more important in order to make Brazil able to achieve larger shares of international market, every day more demanding and competitive. Chemical composition of ethanol-water blends can be determined from their density. In this paper is presented an analysis comparing the density of blends of ethanol with water at 20°C, obtained using Brazilian standard NBR 5992- 80, and by using the model described in the International Recommendation OIML R22. The analysis has identified systematic differences between the results, suggesting that the Brazilian standard should be revised.