C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 11/02 (2006.01) C07C 7/12 (2006.01) C07C 15/00 (2006.01)
Patent
CA 2244489
Polynuclear aromatic compounds (PNA's) produced as a by-product in a hydrocarbon dehydrogenation zone are removed and recovered by admixing the effluent from the dehydrogenation zone with a recycle stream containing mononuclear aromatic compounds (MNA's) and the resulting admixture is contacted with an adsorbent to reduce the concentration of MNA's and PNA's and to produce a stream comprising dehydrogenated hydrocarbons and dehydrogenatable hydrocarbons. The spent adsorbent recovered from the adsorption step containing MNA's and PNA's is regenerated by contacting with a hot hydrogen-rich gas to recover at least a portion of the MNA's and PNA's and to thereby regenerate the spent adsorbent. The hydrocarbon-containing effluent from the regeneration step is then separated into a MNA's -containing stream and a PNA's-containing stream and at least a portion of the MNA's-containing stream is recycled to the mixing step.
Macrae & Co.
Uop Llc
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