| 摘要 |
The invention describes a method for separating hydrocarbons in an installation for generating hydrocarbons from a hydrocarbon-containing charge by cleavage, wherein the product gas of the cleavage, which is produced as the raw gas (1) and which contains gaseous hydrocarbons is compressed (2a) and dried (5a,5b), and supplied as charge material into a separation stage (hereafter referred to as front end C3/C4 separation), in which the raw gas (1) is separated into a hydrocarbon fraction consisting of hydrocarbons having a maximum of 3 carbon atoms (15) and a hydrocarbon fraction consisting of hydrocarbons having at least 4 carbon atoms (17), wherein the front end C3/C4 separation comprises, in terms of process technology, a C4 absorber (6) and a depropanizer (8), wherein a hydrocarbon fraction consisting of hydrocarbons having a maximum of 3 carbon atoms is obtained as a gaseous overhead product (15) of the C4 absorber (6), and wherein a liquid hydrocarbon fraction consisting of hydrocarbons having at least 4 carbon atoms is obtained as a bottom product (17) of the depropanizer (8), characterized in that the front end C3/C4 separation comprises an additional process technological C2/C4 separation stage (7), wherein the C2/C4 separation step (7) is arranged between the C4 absorber (6) and the depropanizer (8). |
