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Basic information about a final thesisAdditional informationAdditional information about the final thesis follows. Click on the language link to display the information in the desired language.
|Language of final thesis:||Slovak|
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|Title of the thesis:||Developement of laboratory reactor and its use for the study of coke formation during pyrolysis of hydrocarbon feedstocks|
|Summary:||The aim of the dissertation thesis was an evaluation of the coking tendency for selected industrial steam cracking feedstock as the yields of the desired low molecular weight alkenes formed during their pyrolysis. The focus of the work was on the development and testing of a new laboratory reactor enabling the study of the coke formation rate, and the coke morphology. The suitable reaction conditions and the process of obtaining reproducible results of coke formation have been found. The developed device allows the measurement of coke deposition using liquid and gaseous hydrocarbon feedstock on coupons made of different materials placed in a steel reactor in the presence of an inert diluent. Formation of an inert layer of SiO2 on the inner wall of the reactor that suppresses the catalytic effect of the reactor on the course of secondary reactions leading to coke formation was studied. Chemical vapour deposition and sol-gel coating method has been verified. The first process resulted in an incompact layer of porous powder on the reactor wall, unlike the cracked film formed by the sol-gel method. Due to continual falling of created SiO2 layer, pre-coking of the reactor walls forming thin protective carbon layer before each set of experiments, was finally chosen. The precision of coke formation measurements was verified by naphtha pyrolysis. The rate of coke formation and coke morphology were studied on two different industrially used alloys in the form of plates placed in the new coking reactor. Two feedstock with different hydrocarbon group composition and sulfur content were used as the raw material. The dependences for the amount of formed coke on the time of the experiment were determined. These show different rates of coke formation depending on the quality of the feedstock used. The coke morphology was studied by scanning electron microscopy after 120 minutes of coking on clean plates where the catalytic mechanism of coke formation prevailed, and after 840 minutes when coke formation was carried out by the free radical mechanism and the condensation mechanism. In the dissertation, changes in Cr, Ni, Fe and Mn content in the surface layers of the tested plates were observed in dependence on the time of their use.|
|Key words:||coke formation, coke morphology, pyrolysis, laboratory pyrolysis reactor, SiO2 coating|
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