Penentuan Kesetimbangan Leaching Antosianin dari Kelopak Bunga Rosella Menggunakan Continuous Screw Extractor
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Abstract
Rosella merupakan salah satu sumber zat antosianin. Antosianin diambil dari kelopak bunga rosella menggunakan metode leaching. Penelitian ini dilakukan untuk menentukan tahap kesetimbangan leaching antosianin dari kelopak bunga Rosella menggunakan continous screw extractor. Tahapan leaching dimulai dengan penyaringan dan pengecilan ukuran kelopak bunga rosella. Selanjutnya, dilakukan variasi rasio pelarut dan padatan (L/S) pada tahap maserasi. Konsentrasi hasil ekstrak (overflow) dan cairan hasil perasan (underflow) digunakan untuk membuat diagram kesetimbangan yang kemudian digunakan untuk perancangan dan penentuan jumlah tahap kesetimbangan. Rasio pelarut dan padatan yang digunakan pada screw extractor yaitu 1,5:1, waktu kontak efektif 411 detik, laju alir pelarut air 1,633 g/detik, dan laju alir padatan 1,089 g/detik. Dengan menggunakan diagram kesetimbangan, didapatkan NTU (Number of Transfer Unit) sebesar 4 tahap, panjang kolom (Z) sebesar 0,42 m, dan nilai HTU (Height of Transfer Unit) sebesar 0,12 m.
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