Dewaxing Solar Dengan Penambahan Mek Tinjauan Termodinamis

In the petroleum industries, wax precipitation is undesirable because it may cause plugging in the pipelines and process equipment. So, the amount of wax in petroleum products should be kept relatively small and it can be achieved by dewaxing. The system in dewaxing is assumed to be a ternary system with the pseudo components of alifatics (wax or paraffins and naphtenes), ketones (MEK), and aromatics. Numerous activity coefficient models were used to predict the solid-liquid equilibrium in dewaxing of diesel fuel with MEK. The models were Unifac, Regular solution, and Two Suffix Margules. In one operation, 15 mL of diesel fuel was mixed with 37.5 mL of MEK (pure or mixed with benzene) and chilled to the desired temperature in a silindrical tube with 2.9 cm of inside diameter, 3.25 cm of outside diameter and 12.25 cm of length. After equilibrium condition was attained, a liquid sample was taken and its composition was analyzed using ASTM D 1319-98. Experimental results showed that pseudo ternary approximation could well predict the equilibrium. It was further observed that Uriifac model with 7.6% of error was better than Regular solution model with 12.3% of error. Two Suffix Margules model gave very good result but it used one adjustable parameter, so it could be used only in this system. Keywords : dewaxing, diesel fuel, ternzodynami