Mineral oils: processes and products – Chemical conversion of hydrocarbons – With subsequent treatment of products
Patent
1995-01-05
1997-07-15
Caldarola, Glenn A.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
With subsequent treatment of products
208102, 208103, 208104, 208105, 585802, C07C 700
Patent
active
056479727
ABSTRACT:
A method of processing a cracked gas feedstream containing hydrogen and C.sub.1 to C.sub.6 and heavier hydrocarbons is described using a relatively low pressure as compared to conventional cryogenic separation processes. At pressures below 27 bars, the feedstream is dried and cooled in a series of steps to initially separate out essentially all of the C.sub.6 and heavier hydrocarbons forming a vapor stream containing the hydrogen, the C.sub.1 to C.sub.3 hydrocarbons and at least some of the C.sub.4 and C.sub.5 hydrocarbons. The C.sub.4 and C.sub.5 components act as an absorption liquid to lower the light ends partial pressure permitting the condensation of C.sub.2 and C.sub.3 components at higher temperature levels and permitting the operation at lower pressures. The vapor stream is then further cooled and separated in another series of steps and processed in a demethanizer column in a manner to provide a high pressure hydrogen and methane overhead product and a high recovery of C.sub.2 and C.sub.3 components in the bottoms.
REFERENCES:
patent: 5453177 (1995-09-01), Goebel et al.
patent: 5502266 (1996-03-01), Hodson
Kantorowicz Steven I.
Stanley Stephen J.
Wadsworth David M.
Warner Rene C. L.
ABB Lummus Global Inc.
Caldarola Glenn A.
Griffin Walter D.
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