EFFECT OF HYDROCARBON CLASSES ON FREEZING POINT AND SMOKE POINT OF SOAPDEFFECT OF HYDROCARBON CLASSES ON FREEZING POINT AND SMOKE POINT OF SOAPDERIVED BIOKEROSENE (SBK) SURROGATE MIXTURES ERIVED BIOKEROSENE (SBK) SURROGATE MIXTURES

• Main Author: Aghnia - NIM 13114007 , Nursifa
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29819
• Institution: Institut Teknologi Bandung

<p align="justify">The technology development for air transportation is growing fastly and its potential to ease human activities makes a high demand on aviation. Aviation also depends on aviation fuels that are commonly fossil based and has been an issue to fossil fuel scarcity and environment. <br /> <br /> <br /> One of the solution that gains much attention for jet fuel issues is biofuel. In common biojet fuel production, the processes include isomerization and cracking that are complicated and costly. Therefore, Soap-derived Biokerosene (SBK) has been developed. This biojet fuel has simpler production process than common aviation biofuel processes. To avoid the isomerization process, SBK is intended to be blended with cycloparaffins and aromatics since they have lower freezing points. <br /> <br /> <br /> Adding aromatics for freezing point decrement becomes a concern because it also changes the smoke point. This is related to molecular structure of hydrocarbon. Therefore, the effect of hydrocarbon classes to freezing point and smoke point of hydrocarbon mixtures are concerned. <br /> <br /> <br /> The compositions measured consisted of dodecane as SBK surrogate blended with bicyclohexyl, cyclohexylbenzene, and hexylbenzene. Freezing points and smoke points were obtained using standard test method from ASTM D5972 and ASTM D1322-97, respectively. The Threshold Sooting Index (TSI) for measuring the tendency to form soot was also obtained using a formula. The results obtained shows the highest effect in changing freezing point was given by aromatic class with n-paraffin alkyl group, followed by cycloparaffin, and the least effect was given by aromatic with cycloparaffin alkyl group. Aromatic classes give more decrement to smoke point than cycloparaffin class. Aromatic with cycloparaffin alkyl group gives more effect to smoke point than aromatic with n-paraffin alkyl group. It also shows that n-paraffin alkyl group made a higher effect of hydrocarbon classes on freezing point. In conclusion, cycloparaffin class with nparaffin alkyl group is the best compound to be added to n-paraffin or biojet fuel considering its effect to both freezing point and smoke point. <p align="justify"> <br />