In recent years, with the increasing consumption of fossil fuels and global warming due to high emissions of greenhouse gases, attention to biofuels has increased. On the other hand, with the growth of population and improvement of the living standards, the consumption of textile fibers has increased sharply and now, exceeds 100 millions tons per year. Most textile fibers are made of polyester, which is produced from fossil sources. In most countries the main strategies for waste textile management are landfill and incineration that caused many environmental problems while main part of these wastes can be turned into biological products such as bioethanol. By applying this method, the production of new fabrics from raw materials can be reduced, and the consumption of water, energy and chemical material in the fabric production process is reduced. Technical, and Economical Analysis of eight process scenarios in the form of biorefinery for bioethanol production and chemical recycling polyester, along with production byproducts from waste textile were investigated. Simulation of the processes was carried out by Aspen plus software. Using the simulation results, economical assessment done by Aspen process economic analyzer. Afterwards, total capital investment, manufacturing costs, and manufacturing price of bioethanol were estimated for each case and sensitivity analysis were conducted. Based on the results obtained, In scenarios 1 to 7, the price of produced ethanol is lower than that of ethanol in Iran. Thus, producing ethanol was affordable, regarding to the price of ethanol in Iran. The studies showed that initial investment required for each scenario was 36.70, 40.84, 36.82, 37.68, 37.50, 37.60, 38.48, and 42.89 M$, respectively. Among the simulated scenarios, scenario 1 was identified as the most economically viable scenario. The payout period in this scenario was 3.47 years and the profitability index was 2.24. Keywords: Waste textile, Technical and Economical Analysis, Bioethanol, Recycling polyester
