BIOHYDROCARBON SYNTHESIS VIA PYROLYSIS OF DIVALEN METAL BASED SOAP

• Main Author: Puspawiningtiyas, Endar
• Format: Dissertations
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/74412
• Institution: Institut Teknologi Bandung

The CO2 removal technology in fatty acids through pyrolysis shows that the pyrolysis of monounsaturated fatty acids (oleic acid) produces more green gasoline products compared to saturated fatty acids. Trial synthesis of green gasoline-type biohydrocarbons from pleic basic soap ????Ca(OH)2.(1-????)Mg(OH)2.Zn(OOCR)2 ; 0 < ???? < 1 has been carried out. Approximately ±75%-mol, the highest green gasoline (C7–C11) yields can be achieved at a metal ratio of 0.15 (???? = 0.15). Based on the oleic basic soap formulation 0,15Ca(OH)2.0,85Mg(OH)2. Zn(OOCR)2, the development of a process to obtain the most effective temperature for pyrolysis of oleic basic soap carried out (the second step). The highest yield of liquid hydrocarbons was around 57.3%-wt by pyrolysis of oleic basic soap at 450 °C with the composition of alkanes (11.3%), alkenes (10.7%) and iso-alkanes (78%), as well as the recovery of green gasoline (C6–C11) 63%. The gasoline fraction from crude pyrolysis soap has an octane number 79.8. The next effort is to increase the octane number by inserting Cr metal in Ca-Mg-Zn oleic basic soap. Insertion of Cr metal in oleic basic soap oleat ((RCOO)2 Zn4Mg(2-????)Ca????Cr2 (OH)8CO3) to increase the aromatic content and octane number has been carried out (the thirth step). Pyrolysis of oleic Ca-Mg-Zn basic soap with Cr metal insertion is proven to increase the aromatic in liquid hydrocarbon product. The highest octane number (90.3) is achieved at ???? = 0.75 with an increase of about 10.5 poins from oleic basic soap without Cr. The pyrolysis product of Cr oleic basic soap in each ???? has a different dominant hydrocarbon distribution, due to the non homogeneous mixed hydroxide. Experiments have been conducted to prove whether soap made from homogeneous double hydroxide will produce a uniform type and composition of hydrocarbons and whether, at 250°C, the basic oleic soap has decomposed. If so, the decomposition stage would be studied. Heating the three basic soaps (C17H33COO)3Zn2Cr(OH)3X, X = Cl, ½SO4, OOCH at 250°C resulted in an average 8-heptadecene dominant product of around 74.06%. Observations showed that oleic base soap made from homogeneous double hydroxides produced a uniform type and composition of hydrocarbons. Heating oleic basic soap at 250°C proved to have decomposed. The decomposition stage began with the formation of hydrocarbons (8-heptadecene) and then cracked due to the influence of temperature.