High-score process for hydrogenation
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For the same diesel hydrogenation process, why do some processes involve only cold high-cut and cold low-cut fractions, while other processes include hot high-cut, hot low-cut, cold high-cut, and cold low-cut fractions?
Investments with high and low heat levels require large amounts of capital but have low operating costs! With no investment, the scale is small and operating costs are high! The starting points are different, that’s my personal opinion!
This is in relation to the scale of plant design, investment, and the economic efficiency of the two processes; hydrorefining is rarely used, while hydrocracking is more commonly employed. Moreover, the loss of hydrogen gas in high-temperature processes is higher compared to losses of naphtha and liquefied gas, as well as those in low-temperature processes. Currently, process optimization designs are being applied to high-temperature processes in order to reduce hydrogen gas losses and improve energy utilization
The option with varying temperatures has low energy consumption but high investment costs, while the option without such variations has higher energy consumption but a relatively simpler process and lower investment costs.
Does hydrorefining require a high-temperature and low-temperature process?
It is mainly based on energy utilization and investment considerations.