Process and facility for producing propylene by combining propane hydrogenation and a steam cracking method with pre-separation steps in the two methods for partially removing hydrogen and methane

摘要

The invention relates to a process (10) for producing propylene, comprising: carrying out a method (1) for propane dehydrogenation in order to obtain a first component mixture (A); carrying out a steam cracking method (2) in order to obtain a second component mixture (B); forming a first separation product (P1) at least predominantly containing propylene, by means of at least one first separation step (S1); forming a second separation product (P2) at least predominantly containing propane, by means of the at least one first separation step (S1); forming a third separation product (P3) at least predominantly containing ethylene, by means of at least one second separation step (S2); and forming a fourth separation product (P4) at least predominantly containing ethane, by means of the at least one second separation step (S1). According to the invention, at least part of the first component mixture (A) is subjected to at least one first pre-separation step (V1) in order to obtain a third component mixture (C), which includes a pressure increase and at least partial removal of hydrogen; at least part of the second component mixture (B) is subjected to at least one second pre-separation step (V2) in order to obtain a fourth component mixture (D), which includes a pressure increase, at least partial removal of hydrogen, and at least partial removal of methane; and at least part of the third component mixture (C), along with at least part of the fourth component mixture (D), is subjected to the at least one first separation step (S1). The invention further relates to a facility and a method for retrofitting a steam cracking facility.