Hydrocracking design pressure issues
Thread Content
Why are the operating pressures of various hydrocracking units designed differently?
The required reaction pressure is different depending on the raw materials and products of the device. The effective pressure of the reaction is the hydrogen partial pressure. The required reaction pressure can be calculated based on the hydrogen partial pressure and the purity of the mixed hydrogen. High pressure is beneficial to the hydrogenation reaction, but increases energy consumption. Therefore, it is necessary to select an appropriate reaction pressure while meeting the reaction product requirements.
Mainly related to the raw materials processed； and related to the required product quality requirements.
The system pressure is designed according to the properties of the raw materials, and the design of the reaction system pressure is determined by the patentee and the research institute.
The most important thing is determined by the properties of the raw materials and product requirements, and the selected catalyst also has an impact. On this basis, the principle of minimum energy consumption should be followed.
Indeed, as everyone above said, the processing raw materials and target products are different, resulting in different operating conditions of the device. Of course, the activity and selectivity of the catalyst used also have an impact. For example, diesel hydrogenation also requires a diesel product with a sulfur content of less than 350PPM. For straight-run diesel, the operating pressure is generally less than 6.0MPa. ； For secondary processed diesel such as catalytic diesel, it is generally between 6.0MPa and 8.0MPa.