C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
260/677
C10G 9/16 (2006.01) C10G 9/00 (2006.01) C10G 9/20 (2006.01) F28C 3/06 (2006.01)
Patent
CA 1145776
A B S T R A C T QUENCH PROCESS A process of efficiently recovering heat from hydrocarbon pyrolysis effluent (3), whilst lessening coking problems, by cool- ing the effluent (3) in two quenchers, in the first (4) indirectly to at least 540°C with production of high pressure steam (6) and in the second (8) to at least 370°C, the second quencher (8) comprising a direct quench section (9) giving an effluent quench liquid mixture of at least 400°C, followed by an indirect quench section (11) producing high pressure steam (13); then, the effluent quench liquid mixture is fractionally distilled (17) and a bleed stream (22) from the distillation (17) is cooled and returned to the distillation. Coking materials may be removed from the bottoms (21) of the fractionating column by adding aromatic hydrocarbons (27) and separating off the precipitate then formed; the bottoms thus treated can be used as quench liquid (19). Figs. 1 + 2
365593
Shell Canada Limited
Smart & Biggar
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