AbstrakTelah dilakukan penelitian yang bertujuan untuk memisahkan gliserol dari pengotornya untuk mendapatkan kadar yang lebih tinggi. Pemisahan gliserol dilakukan dengan penambahan asam phospat diikuti penambahan karb贸n aktif untuk menarik sisa kotoran dan warna. Terakhir digunakan rotary evaporator untuk menarik air. Gliserol yang digunakan dalam penelitian ini berasal dari hasil samping pembuatan biodiesel. Minyak goreng bekas dan katalis KOH digunakan sebagai bahan baku untuk pembuatan biodiesel. Hasilnya menunjukkan kadar tertinggi gliserol sebesar 76,43 % dihasilkan pada kondisi : pH 6; karb贸n aktif 5 % dan waktu adsorbsi 24 jam. AbstractA research has been done in order to separate glyserine from its impurity to gain glycerine with higher concentration. The separation was first done by using phosporic acid. Alter separation the free acid and other impurities, activated carbon was added to remove the glycerine colour. Finally, rotary evaporator was used to extract water from glycerine. Glycerine that was used in the experiment was taken from the by product of biodiesel preparation. Waste cooking oil and kalium hydroxyde catalyst were used as raw material of the biodiesel production. The result show that the highest concentration of glycerine is 76,43 % obtained at neutral condition at pH 6; 5 % activated carbon and adsorption time 24 hour.
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