PROCESS AND PLANT FOR PRODUCING PROPYLENE BY COMBINATION OF PROPANE DEHYDRATION AND STEAM CRACKING WITH RECYCLING OF PROPANE INTO THE STEAM CRACKING PROCESS

The invention relates to a process (10) for the production of propylene which comprises carrying out a process (1) for propane dehydrogenation to obtain a first component mixture (A), carrying out a further propylene production method (2) to obtain a second component mixture (B), and forming a separation product (P2) containing predominantly propane using one or more propane separation steps (S1), wherein at least part of the first component mixture (A) is supplied to the propane separation step or steps (S1). It is envisaged that the separation product (P2), which mainly contains propane, will at least partly be returned to the further propylene production method (2). A corresponding plant and a process for converting a steam cracking plant are also the subject of the invention.