PENGARUH KONSENTRASI ASAM SITRAT TERHADAP PENURUNAN BILANGAN ASAM DAN KEPEKATAN WARNA MINYAK JELANTAH MELALUI PROSES ADSORPSI
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Abstract
Penelitian ini bertujuan untuk mempelajari pengaruh konsentrasi (persen berat atau %w/w) asam sitrat yang dimanfaatkan sebagai adsorben terhadap penurunan bilangan asam dan kepekatan warna pada minyak goreng bekas. Pada penelitian ini dilakukan metode adsorbsi dengan tahapan tahapan proses yaitu proses despicing, netralisasi dan bleaching, dengan variasi konsentrasi asam sitrat 1%, 1.5%, 2%, 2.5%, 3% (w/w) serta temperatur pemanasan 70oC dan kecepatan pengadukan 500rpm selama 60 menit. Dari hasil penelitian didapatkan penambahan asam sitrat yang paling baik adalah 2% (w/w). Persamaan polinomial hubungan antara konsentrasi asam sitrat (x) dan bilangan asam (y) adalah y = 0.1834x2 – 0.768x + 1.3591 dengan nilai R2 = 0.9367. Pada kondisi terbaik besarnya bilangan asam adalah 0.5319 dan nilai kepekatan warna adalah 37/20. Kata kunci: asam sitrat,minyak goreng bekas,adsorbsi.
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