جستجوی مقالات مرتبط با کلیدواژه « Heavy Naphtha » در نشریات گروه « فنی و مهندسی »

Thermal cracking of hydrocarbons is one of the most important industrial processes which results are Olefin products including Ethylene and Propylene as desirable products. The undesirable process is Coke formation which causes several problems in thermal cracking reactors such as: heat transfer reduction, increase the pressure drop in the reactor, fuel consumption increase, shortening the life of the reactor, and so on. Consequently, we can decrease such undesirable affects with choosing proper alloy on reactors construction and also using right feed or some inhibitors. In this article we investigated reduction of coke formation and Structural changes by using Light and heavy Naphtha as common feedstock entering the reactor and Heptane as a feedstock without sulfur, Nickel alloys like HP mod, HP mic, SS316 and SS304 and also using Scanning Electron Microscope (SEM/EDAX analysis) as an analysis way to view.

The purpose of the catalytic reforming process is the production of high octane number gasoline which is a strategic and economic in the trade market. In this research, the regeneration of commercial Pt-Re/Al2O3 catalyst used for catalytic reforming of heavy naphtha is studied in the laboratory scale. This catalyst is unloaded from a fixed-bed reactor located in an Iranian refinery, and is at the end of its cycle life (about 2 years). After loading the catalyst in the laboratory scale, for performing the regeneration process, the coke on the surface of the catalyst is burned with the dry air. Then, chlorination process is carried out for the re-dispersion of chlorine agent on the catalyst surface. Finally, the catalyst is reduced and sulfided using hydrogen and H2S streams, respectively. During the regeneration, the flow rate, temperature and pressure of process are meticulously controlled, and also the optimized values are chosen to have the best regeneration. The results show that the regenerated catalyst, according to the recommended method in this research, has the capability of producing gasoline with the octane number higher than 100 which is approximately similar to the gasoline produced by the fresh commercial catalyst.

The thermal cracking of hydrocarbons is one of the most important industrial processes producing olefin products including ethylene and propylene as desirable products. The undesirable process is coke formation, which causes several problems in thermal cracking reactors such as heat transfer reduction, increasing the pressure drop in the reactor, increasing fuel consumption, shortening the life of the reactor, and so on. Consequently, such undesirable affects can be decreased by choosing a proper alloy in reactor construction, using right feed, or some inhibitors. To prevent the formation of coke, some inhibitors were investigated. The variety of experiments showed that inhibitors like dimethyl disulfide and carbon disulfide could strongly decrease the coke formation. In this article, the reduction of coke formation and structural changes were investigated by using heavy naphtha as the normal feedstock entering the reactor, the above sulfide inhibitors, and stainless steel 304 as well as employing scanning electron microscope (SEM/EDAX) as an analysis technique.