Assessment of the Effect of Dimethyl Disulfide Concentration Dosing on Coke Formation and Furnace Run Length Predictions: Experimental and Modeling Study
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Abstract
The olefins are produced by steam cracking furnaces in the petrochemical industry. The olefins production is strongly affected by the furnace run length. The coke deposition inside the cracking coil determines the furnace run length. Dimethyl disulfide (DMDS) is mainly utilized in steam crackers as coke and CO inhibitors. A cracking setup is utilized for studying the influence of various concentrations of DMDS on cracking performance. The simulation model utilized to evaluate furnace run length showed excellent performance in the prediction of the furnace run length (average absolute error = 0.83%). The ethane conversion, ethylene selectivity, carbon monoxide (CO) formation, coking rate, coke morphology, and metal migration to coke are vital parameters in olefin performance and furnace run length. Accordingly, different concentrations of DMDS including the industrial dosage are selected, evaluated, and optimized by the experimental method. The results show that the minimum coke formation is achieved when the DMDS concentration is 20 ppmw, in which the coking rate for steam cracking is 52% less than that of industrial dosage (111 ppmw). Moreover, a 50% decrease in CO formation is observed when DMDS concentration changed from 111 to 20 ppmw. Based on the simulation model, the optimum DMDS dosage results in an increase in the run length from 60.21 to 95.12 days.
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