Integrated Thermal Conversion of Petroleum Residues and Waste Engine Oils for Enhanced Coke Production
Abstract
Heavy oil residues are significant waste streams in the petroleum refining industry, although delayed coking stands out as a promising method for its processing, which allows the use of a wider range of other raw materials. This article discusses an approach to adding waste engine oils in delayed coking processes. The influence of petroleum residues (tar) and temperature on the quality and yield of target products, such as liquid hydrocarbons and solid residue - petroleum coke, is analyzed. The change patterns in the composition, properties and structure of products were determined by gas chromatography, Raman and infrared spectroscopy, scanning electron microscopy and Brunauer-Emmett-Teller method. The results have shown that the analyzed coke has decent ash, metallic, moist and volatile matter contents. Therefore, it can be used in the production of anodes. The structure of coke obtained from tar in the presence of engine oils corresponds to needle coke. The product yield exhibited a temperature-dependent behavior, with higher temperatures promoting increased formation of coke and gaseous products. In order to obtain efficient product yield and coke with decent structure and porosity, with residual engine oils, it is necessary to conduct coking at a temperature of 500 °C.