Abstract: The fractionation process of hydrocracking unit mainly consists of stripper process and debutanizer process. Taking a 1.5 Mt/a hydrocracking unit as an example, this article analyzes the differences between stripper process and debutanizer process, and compares them in aspects of equipment investment, operating cost and product properties through process simulation. The conclusion is that the equipment investment and operating cost of debutanizer process are higher than those of stripper process, but the LPG product properties of debutanizer process are better than those of the stripper process. The contents of C1~C4, H2O and H2S in light naphtha products of debutanizer process are lower than those of stripper process, and the stability of heavy naphtha products of debutanizer process is better than that of stripper process. Refineries can select appropriate processes according to the actual conditions.

Key words: hydrocracking, stripper, debutanizer