Regarding the adaptability of different feedstocks for hydrocracking, can straight-run diesel, catalyzed diesel, and straight-run wax oil be used as mixed feed?
Thread Content
This post was last edited by 328104062 on 2018-12-29 09:25. As the title suggests, hydrocracking is applied to straight-run diesel, catalytic diesel, and straight-run wax oil, with the desired product being heavy naphtha. 1. What are the differences in terms of catalyst selection, yield, and operating parameters among the plants used for processing these three types of feedstocks? What are the differences in product distribution? 2. Is it possible to build a single unit to process a mixed feed of these three raw materials? What should be considered when choosing a catalyst?
A large-scale hydrocracking unit can solve this problem. The reaction process generally involves hydrogenation, cracking, and then hydrogenation again; different feedstocks exhibit varying degrees of cracking at the same temperature, and this can be adjusted by changing the temperature.
1. Ensure the stability of crude oil properties, so as to prevent large fluctuations in the properties of straight-run diesel, straight-run wax oil, and catalytic feedstocks； 2. The properties of the catalytic raw materials remain stable, and the stability of the catalyst can be controlled by adjusting the reaction conditions ； 3. The above two points ensure the stability of the properties of the three types of mixed raw materials. By selecting the optimal catalyst composition and reaction conditions for the target product based on the different proportions of these three raw materials, it is possible to achieve the goal of processing multiple types of raw materials using a single processing unit.
Primarily, it is the catalyst grading and the properties of the raw materials that determine the process flow.
We are currently using a mixed feed of catalytic diesel, straight-run diesel, vacuum wax oil, and coker wax oil. Diesel components account for one-third, while paraffin wax accounts for 8 percent. The operation involves paying attention to the properties and proportions of different raw materials, and adjusting the reaction temperature accordingly. If you want to know the specifics, it would take too many keystrokes to type them out. . A single unit is also feasible; we will build one diesel hydrocracking unit in phase two
For our 1.5 million-unit hydrocracking unit, the main feedstocks are Changchai diesel, accelerated diesel, straight-run wax oil, and mixed feedstocks. Using Changchai diesel yields a higher diesel yield, while accelerated diesel requires more hydrogen and results in a more intense reaction; straight-run wax oil leads to a higher yield of light products, and the naphtha yield increases as well. The catalysts used are the FBN series hydrogenation protectants developed by the Fushun Petrochemical Research Institute, along with the FF-66 hydrogenation refining catalyst and the FC-32A hydrocracking catalyst.
It is necessary to control the proportions of various materials carefully; if it’s difficult to control the raw materials, it will be hard for the design institute to come up with a suitable plan