Process for producing ethylene from a hydrocarbon feedstock

Details Process for producing ethylene from a hydrocarbon feedstock Process for producing ethylene from a hydrocarbon feedstock

1998-04-16

2000-03-14

Caldarola, Glenn

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

By c content reduction, e.g., cracking, etc.

585648, 585951, 208106, C07C 402, C10G 900

Patent

active

060375159

ABSTRACT:
The invention relates to a process for producing ethylene from a hydrocarbon feedstock, whereby the hydrocarbon feedstock is subjected to cracking. The crude gas thus produced undergoes quenching with water washing, crude gas compression, and crude gas drying and precooling. The gas is then sent to a separation section, wherein a C2/C3 separation of the precooled crude gas into a C2- stream and a C3+ stream is conducted. The C2- stream is sent through C2 hydrogenation, and the C3+ stream is separated into a C3 stream and a C4+ stream by means of a C3/C4 separation. According to the invention, when the process is started up, at times foreign ethylene and/or foreign C3 is fed to crude gas compression. In addition, a stream from C2 hydrogenation and a C3 stream from the C3/C4 separation are merged and recycled as a first recycle stream before crude gas compression.

REFERENCES:
patent: 2573341 (1951-10-01), Kniel
patent: 2580002 (1951-12-01), Carrier
patent: 4143521 (1979-03-01), Pano et al.

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