Reducing coke formation at visbreaking units with the introduction of a passivator

Based on the analysis of the use of the developed additives to reduce the deposition of coke on a metal plate in the process of tar visbreaking, the effectiveness of sulfur-containing and phosphorus-containing reagents was determined. Under laboratory conditions, the influence of sulfur-containing, phosphorus-containing compounds, reagents containing nitrogen and oxygen-containing compounds in their composition on the process of coke deposition on a metal plate during visbreaking was studied. The process of tar coke deposition in the process of visbreaking in the presence of developed passivators, in the amount of 5, 10, 15 ppm, was studied during preliminary treatment of the reactor and metal plate for 24 hours. The study of the process was carried out on a laboratory batch coking unit with appropriate temperature conditions. It is shown that the use of the developed reagents (P-1, P-2, P-3, P-4) in the process of tar visbreaking, it helps to reduce the adhesive ability of the metal to coke deposition, depending on the concentration, during the pre-treatment time of 24 hours.