HYDROGENATION AND METAL SOAP DECARBOXYLATION OF CYCLOPROPENOID FATTY ACIDS

• Main Author: Yulianda, Rita
• Format: Theses
• Language: Indonesia
• Subjects: Teknik kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/33487
• Institution: Institut Teknologi Bandung

Cyclopropenoid fatty acid is a derivative of fatty acid in nature that has a unique characteristic because it has a cyclopropene group in the middle of carbon chain. Cyclopropenoid acid is contained in the seed core of Kepoh, Sterculia foetida up to 70%. These cyclopropene groups can be rearranged and hydrogenated to obtain branched fatty acids which are very useful as renewable fuels. A bit of branched hydrocarbons in biofuel can reduce the fuel freezing properties, improve the quality of the fuel. The objective of this research are to obtain the metal soap decarboxylation process of cyclopropenoid fatty acid from Kepoh seed core for producing green diesel fuel and to obtain the catalytic displacement hydrogenation process of fatty acid methyl ester (FAME) from Kepoh seed core for producing biodiesel. Oil from Kepoh seed core is transesterified to form EMAL and which is further decarboxylated and hydrogenated separately. Decarboxylation is carried out from metal soaps of Kepoh methyl esters. Liquid product of decarboxylation from two types of soap-making processes were analyzed using GC-MS. Decarboxylation of best metal soaps is metal soap decarboxylation through metathesis, producing 65.42% hydrocarbons from liquid product. The hydrogenation of catalytic displacement is carried out and the liquid product of hydrogenation is characterized by determining the iodine number, Besson test, and freezing properties. Based on the analysis and characterization of the hydrogenation product, the presence of Cu is highly reactive to the cyclopropenoid group at room temperature and can open the cyclopropenoid ring. Hydrogenation using Ag-Ni catalyst with diformin as hydrogen donor and at temperature160°C can open the cyclopropenoid ring, but the product not a branched fatty acid. keywords: hydrogenation, decarboxylation, cyclopropenoid fatty acids, green diesel, biodiesel