The goal of the study was to simulate a process called the Claus process for sulfur recovery in refineries. The researchers used Aspen HYSYS software to model the process and found that it effectively converted sour gas into a sulfur product while reducing sulfur dioxide emissions. They discovered that the composition and flow of the feed gas were key factors in determining the conversion of hydrogen sulfide. Increasing the nitrogen content in the feed gas only slightly increased the sulfur content in the final product.