Ahmad Jamekhorshid

Gas refinery is an important process in energy production and economy. The importance of gas refinery and high amounts of inputs and pollutants in the processes emphasize the study of environmental impacts. One of the important consequences of oil and gas and petrochemical industries in developing societies is the occurrence of various types of environmental pollution. Therefore, having a community perspective on industrial complexes is essential in order to achieve the option that causes the least environmental damage. Life cycle assessment is a well-known method in the oil, gas and petrochemical industries for assessing the environmental impacts of a process, product or service and a tool for quantifying the environmental impacts of a product at all stages of its life cycle. The environmental impacts of the nature of the gas refinery process were examined and assessed in a life cycle assessment study. In this study, the functional unit of one ton of exported gas product and the system boundary from the time the gas is extracted to the time the products leave the refinery are considered as gate-gate. Also, in this study, the recipe method, which examines the largest number of impact classes, was used for life cycle assessment. In general, this method examines 21 intermediate impact classes and 3 final impact classes. In the present study, the highest environmental impacts of the entire refinery life cycle are on the global warming impact category (impact on human health) and then the shortage of fossil resources, which are greenhouse gas emissions to the atmosphere by chimneys and refinery flaring and sour gas feed consumption, respectively. Also, according to the weighting results at the final level, the final environmental index score for the entire second refinery was estimated to be 49.20pt. The highest environmental impacts of the entire refinery life cycle are on the human health damage category and then the ecosystem quality category, and in both categories,