Nurmawati, Ardika (2019) PENGUKURAN KESETIMBANGAN UAP-CAIR ISOTERMAL SISTEM BINER ALKOHOL + ISOOKTANA/N-HEPTANA DAN SISTEM TERNER ISOOKTANA/N-HEPTANA + ALKOHOL + DIETIL KARBONAT PADA TEMPERATUR 303,15-323,15 K. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penambahan zat aditif pada gasoline dapat mempengaruhi tekanan uap dari campuran gasoline. Untuk mengetahui efek tersebut perlu pengetahuan tentang kesetimbangan uap-cair untuk campuran komponen gasoline dan zat aditif. Pada penelitian ini kesetimbangan uap-cair sistem biner isobutanol + isooktana/n-heptana dan sistem terner isooktana/n-heptana + isobutanol + DEC diukur pada suhu 303,15-323,15 K menggunakan ebulliometer quasistatik yang telah dimodifikasi. Peralatan yang digunakan divalidasi dengan cara membandingkan tekanan uap murni isobutanol, isooktana, n-heptana, dan DEC secara eksperimen dengan data literatur. Hasil average absolute deviation (AAD) yang diperoleh kurang dari 1,1%. Tekanan uap sistem biner dan terner dikorelasikan dengan model Wilson, NRTL, dan UNIQUAC dan diprediksi menggunakan model UNIFAC. Pada sistem isobutanol + isooktana AAD yang diperoleh adalah 1,6%, 1,5%, 1,7%, dan 2,5%, sedangkan untuk sistem isobutanol + n-heptana AAD yang diperoleh adalah 1,8%, 1,7%, 2,0%, dan 2,1% untuk masing-masing model yang digunakan. Dari hasil penelitian diperoleh bahwa dua sistem biner yang diteliti menyimpang dari keadaan ideal dan ditemukan titik azeotrope. Untuk sistem terner isooktana + isobutanol + DEC diperoleh AAD sebesar 1,4%, 1,9%, 1,7%, dan 4,6%, sedangkan pada sistem n-heptana + isobutanol diperoleh AAD sebesar 1,5%, 3,9%, 2,3%, dan 2,8% untuk masing-masing model. Penambahan DEC pada campuran gasoline-isobutanol mengakibatkan penurunan tekanan uap mencapai 13% dan penurunan laju evaporasi mencapai 18%.
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Addition of additives to gasoline can affect the vapor pressure of the gasoline mixture. To determine this effect, knowledge of the vapor–liquid equilibrium of mixtures of gasoline and additive components is required. In this study, the vapor–liquid equilibria of the binary systems isobutanol + isooctane/n-heptane and the ternary systems isooctane/n-heptane + isobutanol + DEC were measured at temperatures ranging from 303.15 to 323.15 K using a modified quasistatic ebulliometer. The equipment used in this experiment was validated by comparing the experimentally measured vapor pressures of pure isobutanol, isooctane, n-heptane, and DEC with literature data. The average absolute deviations (AADs) obtained were less than 1.1%. The vapor pressures of the binary and ternary systems were correlated using the Wilson, NRTL, and UNIQUAC models and predicted using the UNIFAC model. For the isobutanol + isooctane system, the AADs obtained were 1.6%, 1.5%, 1.7%, and 2.5%, while for the isobutanol + n-heptane system, the AADs were 1.8%, 1.7%, 2.0%, and 2.1% for each model used, respectively. The results showed that the two binary systems studied deviated from ideal behavior and exhibited azeotropic points. For the ternary isooctane + isobutanol + DEC system, the AADs obtained were 1.4%, 1.9%, 1.7%, and 4.6%, while for the n-heptane + isobutanol + DEC system, the AADs were 1.5%, 3.9%, 2.3%, and 2.8% for each model, respectively. The addition of DEC to the gasoline–isobutanol mixture resulted in a reduction of up to 13% in vapor pressure and an 18% decrease in the evaporation rate.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Kesetimbangan Uap-Cair, Dietil karbonat, Isobutanol, Wilson, NRTL, UNIQUAC, UNIFAC |
| Subjects: | T Technology > TP Chemical technology > TP343 Liquid and gaseous fuel |
| Divisions: | Faculty of Industrial Technology > Chemical Engineering > 24101-(S2) Master Thesis |
| Depositing User: | Nurmawati Ardika |
| Date Deposited: | 22 Jul 2026 01:48 |
| Last Modified: | 22 Jul 2026 01:48 |
| URI: | http://repository.its.ac.id/id/eprint/69210 |
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