SEPARATION OF VITAMIN E FROM PALM FATTY ACID DISTILLATES (PFAD) BY ADSORPTION PROCESS USING SILICA

• Main Author: Veningtia Sari, Anggita
• Format: Theses
• Language: Indonesia
• Subjects: Teknik kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/53280
• Institution: Institut Teknologi Bandung

Vitamin E is one of the compounds in palm fatty acid distillate (PFAD) which was carried away due to thermal treatment in the deodorization unit in the refining process of crude palm oil (CPO). The process of isolating vitamin E can be done by combining several common processes such as neutralization, extraction, and purification. Adsorption process has been widely used to purify vitamin E. The purpose of this study was to determine the effect of batch adsorption process using silica as adsorbent on the purity of vitamin E concentrate. The operating conditions that were varied included the effect of the adsorption temperature and silica mass ratio. Equilibrium isotherm of the adsorption process was carried out by comparing the Langmuir and Freundlich models. To determine the results of the purification process, the analysis was carried out on the vitamin E content and antioxidant activity in the final product of vitamin E purification. There are five stages of the processes in this study, namely neutralization, extraction, adsorption, desorption and evaporation. This study will be focused on the purification of vitamin E using batch adsorption process and the variables to be varied are adsorption temperature (25 ; 35 ; 45°C) and silica mass ratio (0,5 ; 1 ; 2 grams) in 50 ml (initial vitamin E concentration of 0,203 mg/ml) using incubator shaker. An agitation rate of 180 rpm for one hour is used for all samples to achieve the equilibrium for adsorption. Results showed that the adsorption process was exothermic, temperature of 25°C produces the optimum conditions in the system. The adsorption process using silica mass of 0,5g/50 ml with two stages of adsorption on the same extract resulted in a vitamin E uptake percentage of >98%. Vitamin E adsorption followed the Langmuir adsorption isotherm model with a maximum capacity (qmax) of 28,39 mg/g silica and a Langmuir constant (KL) of 0,0343 L/mg. Isopropanol is used as solvent in the desorption process and produces a vitamin E recovery percentage of 96,94%. The concentration of concentrate was obtained with vitamin E purity of 12282 ppm (5,6%-w) and the amount increased 9 times compared to without going through the adsorption process. The concentrate has strong antioxidant activity as evidenced by the IC50 value of 23,33 ppm.