Method and apparatus for recovering ethylene from fluidized catalytic cracking (FCC) off-gas
First Claim
1. A method for recovering ethylene from off-gas of a process for fluidized catalytic cracking (FCC) of a heavy oil fraction, the method comprising the processes of:
- concentrating C2+ components of the FCC off-gas using a pressure swing adsorption process to obtain a C2+ rich mixed gas; and
introducing the C2+ rich mixed gas into a displacement desorption process to recover high-concentration ethylene from the mixed gas.
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Abstract
A method and apparatus for concentrating and recovering ethylene from the off-gas from an apparatus which produces gasoline, propylene and the like by fluidized catalytic cracking (FCC) of heavy oils such as atmospheric residue, generated in a crude oil refining process, is provided. The method and apparatus can reduce the amount of ethylene rinse in the subsequent ethylene displacement desorption process by increasing the ethylene purity of a raw material gas and reducing the concentration of weakly adsorbing components in the raw material gas and can reduce the loss of a desorbent during a distillation process for separating the desorbent from the weakly adsorbing components. Thus, ethylene can be recovered from the off-gas from fluidized catalytic cracking of heavy oils at high concentration and low cost.
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Citations
25 Claims
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1. A method for recovering ethylene from off-gas of a process for fluidized catalytic cracking (FCC) of a heavy oil fraction, the method comprising the processes of:
concentrating C2+ components of the FCC off-gas using a pressure swing adsorption process to obtain a C2+ rich mixed gas; and
introducing the C2+ rich mixed gas into a displacement desorption process to recover high-concentration ethylene from the mixed gas.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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