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Artikel penelitian

Vol 8 No 1 (2014): Volume 8, Number 1, 2014

Review model dan parameter interaksi pada korelasi kesetimbangan uap-cair dan cair-cair sistem etanol (1) + air (2) + ionic liquids (3) dalam pemurnian bioetanol

DOI
https://doi.org/10.22146/jrekpros.5017
Telah diserahkan
November 15, 2023
Diterbitkan
Juni 30, 2014

Abstrak

Bioetanol merupakan sumber energi terbarukan yang menjanjikan sebagai pengganti sumber energi tidak terbarukan seperti minyak bumi. Pada kondisi tekanan atmosferik, etanol memiliki azeotrop dengan air sehingga pemisahan dengan menggunakan distilasi biasa tidak dapat dilakukan. Beberapa proses pemurnian etanol adalah melalui distilasi ekstraktif dan ekstraksi cair-cair dengan menggunakan entrainer berupa senyawa baru yang ramah lingkungan dan dapat digunakan kembali (reuse) yaitu ionic liquids. Penelitian intensif sistem etanol (1) + air (2) + ionic liquids (3) telah dilakukan oleh beberapa peneliti mengenai kesetimbangan uap-cair (VLE), kesetimbangan cair-cair (LLE) yang menghasilkan data kesetimbangan. Penelitian tersebut juga menghasilkan parameter-parameter interaksi yang diperoleh berdasarkan hasil korelasi data kesetimbangan tersebut dengan model Nonrandom two-liquid (NRTL), Electrolyte-nonrandom two-liquid (e-NRTL), Universal quasi-chemical (UNIQUAC), dan persamaan Antoine serta hasil prediksi dengan menggunakan model UNIQUAC Functional-group activity coefficients (UNIFAQ). Model-model dan parameter-parameter interaksi biner termodinamika tersebut dapat digunakan untuk keperluan desain, optimasi, serta kontrol kolom distilasi ekstraktif dan ekstraksi cair-cair dalam proses pemurnian bioetanol. Artikel ini menyajikan review tentang model-model dan parameter-parameter interaksi biner untuk 43 sistem etanol (1) + air (2) + ionic liquids (3) sehingga dapat diketahui model dan parameter termodinamika yang sesuai untuk digunakan. NRTL merupakan model yang paling banyak digunakan untuk mengkorelasi data kesetimbangan pada 40 sistem dan dapat mengkorelasi kesetimbangan uap-cair dan cair-cair dengan baik sesuai dengan karakteristik NRTL yang sesuai untuk sistem polar tekanan rendah. Hal tersebut ditunjukkan dengan nilai root mean square deviation (RMSD) untuk ∆y dan ∆T dan average relative deviation (ARD) yang kecil serta dapat mem-fitting grafik data kesetimbangan tersebut dengan baik.

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