SEPARATION SEQUENCE FOR HYDROCARBONS FROM A GENTLE THERMAL CLEAVAGE

摘要

The invention describes a method for separating hydrocarbons in an installation for generating hydrocarbons from a hydrocarbon-containing charge by cleavage. The product gas of the cleavage, which contains gaseous hydrocarbons, is compressed, dried, and supplied as charge material into a separation stage (a front end C3/C4 separation). The front end C3/C4 separation comprises a C4 absorber and a depropanizer. A hydrocarbon fraction consisting of hydrocarbons having a maximum of 3 carbon atoms is obtained as a gaseous overhead product of the C4 absorber. A liquid hydrocarbon fraction consisting of hydrocarbons having at least 4 carbon atoms is obtained as a bottom product of the depropanizer. The front end C3/C4 separation comprises an additional process technological C2/C4 separation stage is arranged between the C4 absorber and the depropanizer.

主权项

1. A method for separating hydrocarbons in a facility for generating hydrocarbons from a hydrocarbonaceous feed by cleavage
wherein the product gas of the cleavage which is formed as raw gas (1) and contains gaseous hydrocarbons is compressed (2a) and dried (5a, 5b), and is conducted as feedstock into a separation stage (hereinafter: front end C3/C4 separation) in which the raw gas (1) is separated into a hydrocarbon fraction of hydrocarbons having a maximum of 3 carbon atoms (15) and a hydrocarbon fraction of hydrocarbons having at least 4 carbon atoms (17), wherein the front end C3/C4 separation comprises in terms of the process a C4 absorber (6) and a depropanizer (8), wherein a hydrocarbon fraction 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 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 a further C2/C4 separation stage (7) in terms of the process, wherein the C2/C4 separation stage (7) is arranged between C4 absorber (6) and depropanizer (8).