11/8/2022 0 Comments Disadvantages of hydrocrackingFurthermore, the simultaneous effect of catalyst and feed flow rate scale-up ratio on yield of products in the spherical reactor was investigated. It is shown that by using more catalyst in the SR, the yield of more economical products could be well increased, but doing the same is impossible for TR because of the high pressure drop, which damages the catalyst and their structure in the reactor. The calculations showed that the pressure drop in the spherical reactor is negligible in comparison to that of the conventional tubular reactor. The aim of this work is to consider a radial-flow spherical packed bed reactor as an alternative for the tubular packed bed reactor in the HC process and compare the packed beds through important parameters such as pressure drop, yield of products, and temperature profile. These drawbacks can be solved by using a novel radial-flow, spherical packed bed reactor (SR). Some disadvantages of these reactors are pressure drop across the tube, high manufacturing costs, and low production capacity. In a commercial hydrocracking unit, tubular fixed bed reactors (TR) are commonly used. Each method has its own advantages/disadvantages, and refiners must select. Hydrocracking (HC) is becoming a more important process in refineries owing to increasing demand for gasoline and jet fuel in comparison with diesel and home heating oils. Hydroprocessing (hydrotreating and hydrocracking) units are high-pressure. This entry was posted in Week 07 by Jay Chin Yen. Therefore, it is not exclusively used, and refineries typically operate with both processes in order to produce the most desirable yield of products. The evolution of the catalytic cracking (from Houdry to Thermafor to the modern fluid catalytic cracking) has continuously improved upon the thermal efficiencies of the process.Īlthough the hydrocracking process has several advantages over fluid catalytic cracking, hydrocracking is, in comparison, a more costly process. The heat for catalytic cracking is supplied by the regeneration of catalysts. fixed bed, ebullated bed, or expanded bed), catalysts, and hydrogen/carbon ratios, hydrocracking can be highly flexible, with the ability to process both relatively light feedstock as well as heavy vacuum residue into light and middle distillates.Īnother difference between hydrocracking and catalytic cracking includes the change in enthalpy while catalytic cracking is an endothermic process, hydrocracking is an exothermic process. Furthermore, by modifying reactor configurations (e.g. DISADVANTAGES OF HYDROCRACKING CRACKEDBut due to the fact that aromatic rings cannot be cracked until they are fully saturated with hydrogen, the hydrocracking process allows for the processing of more aromatic feedstock, including the byproducts of catalytic cracking (e.g. The primary objective of both cracking processes is to produce lighter saturated hydrocarbons with reduced molecular weights and boiling points from heavy oils. The advantages of hydrocracking include its ability to handle a wide range of feedstock, as well as the selectivity of its distillates. Several factors distinguish these two cracking processes however, typically both processes are used in order to provide the most optimal yield of products in an economically efficient manner. Therefore, some complications from coking are avoided during the hydrocracking process. Additionally, while catalytic cracking is a carbon rejection process, hydrocracking is in a hydrogen addition process. The process is typically accompanied by hydrotreating in order to remove heteroatom species (e.g. Pt and Pd) used in hydrocracking are very susceptible to poisoning and great care must be taken to remove sulfur from the feedstock. The catalysts (highly active noble metals used for hydrogenation e.g. Therefore, hydrocracking utilizes a bifunctional catalyst. Hydrocracking is essentially the combination of two processes: hydrogenation and cracking.
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