Method And Apparatus For Recovering Ethylene From Fluidized Catalytic Cracking (Fcc) Off-Gas

PATENT

Method And Apparatus For Recovering Ethylene From Fluidized Catalytic Cracking (Fcc) Off-Gas

Pub. No.:  WO/2012/026789  International Application No.:  PCT/KR2011/006338

Publication Date:  01.03.2012

Applicants:  KOREA INSTITUTE OF ENERGY RESEARCH; 71-2, Jang-dong, Yuseong-gu Daejeon 305-343 (KR)

SK INNOVATION CO., LTD. [KR/KR]; 99, Seorin-dong, Jongno-gu Seoul 110-728 (KR)

Inventors: 

PARK, Jong Ho; (KR).

KIM, Jong Nam; (KR).

BEUM, Hee Tae; (KR).

LEE, Seong Jun; (KR).

LEE, Jang Jae; (KR).

KIM, Dong Wook; (KR).

KO, Chang Hyun; (KR).

HAN, Sang Sup; (KR).

CHO, Soon Haeng; (KR)

Abstract: 

Disclosed herein are 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. 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, according to the present invention, ethylene can be recovered from the off-gas from fluidized catalytic cracking of heavy oils at high concentration and low cost.

Technical Field

[1] The present invention relates to a method and apparatus for ethylene in concentration 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.

Background Art

[2] In a process of refining crude oil in an atmospheric distillation unit, low-grade heavy oils such as Bunker-C oil are produced in large amounts. When such heavy oils are introduced and treated in a fluidized catalytic cracking (FCC) unit, high-value-added light oil products such as gasoline and propylene are produced together with heavy oil and off-gas. The off-gas generated in the FCC unit is composed of hydrogen, methane, nitrogen, carbon monoxide, carbon dioxide, ethane, ethylene, propane, propylene, C4+, water and trace amounts of impurities (acidic gas, COS, H2S, arsenic, ammonia, nitrile, mercury, etc.). Although the FCC off-gas contains a large amount of ethylene as shown in Table 1 below, the concentration of ethylene in the FCC off-gas is low and the FCC off-gas contains various gases. For this reason, ethylene has not yet been recovered from the FCC off-gas in an economic manner, and the FCC off-gas has been used as fuel gas.

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