The present work is aimed at analysing the compositions of the water, ethanol, and gasoline which has Research Octane Number/RON was 88 forming a stable emulsion (one phase) employing a ternary graph. When the mixture process, the blended fuels consisted of water-ethanol-gasoline were successfully prepared in which they were formed in one phase. Ethanol was derived from Arenga pinnata liquor which is locally called cap tikus using a home-made reflux distillation filled by packing materials. Ethanol obtained were differing their concentration that depended on the column temperature set. It was found that the purities were ranged from 80 to 96% and the higher column temperature was chosen the lower concentration was obtained. Each aqueous ethanol was blended with gasoline to obtain a homogenous solution. For ethanol 80%, compositions of water, pure ethanol, and gasoline were observed at 18, 74, and 8 (%v/v), and 22, 70, and 7 (%w/w). While ethanol 96%, the compositions ratios were 1:22:77 (%v/v) and 1:23:76 (%w/w). The ranges of pure ethanol, gasoline, and water in which they formed one phase solution were recorded at 23-70%, 7-76%, and 1-22%. The work found that substance was in one phase if the wet ethanol keeps being added. When the ethanol composition has decreased the substance was separated into wet ethanol and gasoline. The minimum ethanol dissolved completely into gasoline was of 80%.

Telah dilakukan pembuatan dan pemurnian etanol dari nira aren dengan menggunakan teknik destilasi refluks. Etanol didapatkan dari air nira pohon aren yang telah terfermentasi secara alamiah dan didestilasi menggunakan teknik refluks untuk memperoleh kemurnian 70-96% (v/v). Konsentrasi etanol dalam kaldu yang digunakan dalam pemanasan adalah 30% dengan volume total 7 L dalam ketel (boiler). Sebelum separasi dimulai dilakukan pengeringan (drying) pada kolom dan kondensor dengan tujuan untuk memisahkan sisa air yang terdapat didalamnya. Hasil menunjukan bahwa etanol kemurnian 70%, 85%, 90%, 95% dan 96% diperoleh pada proses pemanasan dengan suhu kolom atas 82, 81, 79.3, 78.3, dan 78.5 ºC.Ethanol was been prepared and purified by using a reflux distillation method. Ethanol was obtained from a sap water tapped of the palm tree (arenga pinnata) and then was distilled by a reflux separation technique. The ethanol concentration obtained a range of 70-90% (v/v), the concentration of yeasted liquor filled inside boiler was of 30% with a volume 7 L. Prior to a separation conducted the reflux colomn was dried by flowing a warm air aiming remove a remnant water from the packing materials. The result showed that the ethanol with the concentration of 70%, 85%, 90%, 95% and 96% were obtained by setting the column temperature at 82, 81, 79.3, 78.3, 78.5ºC.