In this work process simulations are performed for UNIDAK process for the production of naphthalene. As a part of that to do simulations for the process, UNIDAK process is designed in ASPEN PLUS v9.0 simulation user interface. To assess the environmental impacts of the developed process, potential environmental impacts of constituent chemicals are calculated using Waste reduction algorithm (WAR). Engineering economic evaluation is performed using ASPEN ECONOMIC ANALYZER v9.0 which inherently contains the cost of the consumed energy as an operating cost. For the designed process energy analysis is done using ASPEN ENERGY ANALYZER v9.0. From the retrofit analysis studies 63.27% of the energy savings reported. HEN (Heat Exchanger Network) is developed for the base case process and retrofit studies are performed to improve the process efficiency. One heat exchanger is added to the base case HEN which enhanced the process efficiency by 16% with a payback period of 0.3 years. Energy efficient process reduced total potential environmental index (PEI) to 99.9% compa red to the Base case process.