Methods and systems for treating an olefin-containing stream are disclosed. The disclosed methods and systems are particularly suitable for treating an off-gas stream in a refining or petrochemical process, such as from a fluid catalytic cracker (FCC), coker, steam cracker, and the like. The stream is treated in an absorber column to reject lighter stream components and to absorb ethylene and/or propylene into a solvent. The solvent is typically isobutane. The enriched solvent stream from the absorber column is fed to an alkylation reactor, which reacts the dissolved olefin with the isobutane solvent to produce an alkylate product.

A method for producing 1,3-butadiene, including: (A) performing an oxidative dehydrogenation reaction between oxygen and a raw material gas including n-butene in the presence of a metal oxide catalyst, thereby obtaining a produced gas containing 1,3-butadiene; (B) washing the produced gas obtained in (A); (C) contacting the produced gas washed in (B) with a cooling medium to cool the produced gas; and (D) separating the produced gas cooled in (C) into molecular oxygen and inert gases, and other gases containing 1,3-butadiene, by selective absorption into an absorption solvent. In (B), the washing of the produced gas includes blowing the produced gas onto a liquid surface of a washing liquid so that the produced gas contacts the liquid surface of the washing liquid.

A method for producing 1,3-butadiene, including: (A) performing an oxidative dehydrogenation reaction between oxygen and a raw material gas including n-butene in the presence of a metal oxide catalyst, thereby obtaining a produced gas containing 1,3-butadiene; (B) washing the produced gas obtained in (A); (C) contacting the produced gas washed in (B) with a cooling medium to cool the produced gas; and (D) separating the produced gas cooled in (C) into molecular oxygen and inert gases, and other gases containing 1,3-butadiene, by selective absorption into an absorption solvent. In (B), the washing of the produced gas includes blowing the produced gas onto a liquid surface of a washing liquid so that the produced gas contacts the liquid surface of the washing liquid.

Provided are a process and a system for treating both a high-pressure (HP) and a low-pressure (LP) acid gas-containing gas streams. The system includes a HP absorber unit, a flash drum coupled downstream of the HP absorber unit, and a LP absorber unit coupled downstream of the flash drum. The process includes introducing a HP rich amine solution from a HP absorber unit into a flash drum, operating the flash drum such that a flashed sour gas and a flash drum rich amine solution are produced, and introducing the flashed sour gas and the LP acid gas-containing gas stream into a LP absorber unit.

Provided are a process and a system for treating both a high-pressure (HP) and a low-pressure (LP) acid gas-containing gas streams. The system includes a HP absorber unit, a flash drum coupled downstream of the HP absorber unit, and a LP absorber unit coupled downstream of the flash drum. The process includes introducing a HP rich amine solution from a HP absorber unit into a flash drum, operating the flash drum such that a flashed sour gas and a flash drum rich amine solution are produced, and introducing the flashed sour gas and the LP acid gas-containing gas stream into a LP absorber unit.

A system for mitigating naturally occurring radioactive materials (NORM) in an oxidative dehydrogenation process includes a feed stream, an oxidative dehydrogenation (ODH) reactor, an effluent stream, a processing unit, and a NORM reduction unit. The feed stream includes oxygen, a hydrocarbon, and NORM. The ODH reactor is configured to receive the feed stream and react the hydrocarbon with the oxygen to form a dehydrogenated hydrocarbon and water. The effluent stream includes the dehydrogenated hydrocarbon, water, unreacted hydrocarbon, and NORM. The processing unit is configured to process the effluent stream to form product stream and a recycle stream. The product stream includes the dehydrogenated hydrocarbon. The recycle stream includes unreacted hydrocarbon and NORM. The NORM reduction unit is configured to reduce an amount of the NORM in the recycle stream to produce a NORM-reduced recycle stream. The ODH reactor is configured to receive the NORM-reduced recycle stream.

A system for mitigating naturally occurring radioactive materials (NORM) in an oxidative dehydrogenation process includes a feed stream, an oxidative dehydrogenation (ODH) reactor, an effluent stream, a processing unit, and a NORM reduction unit. The feed stream includes oxygen, a hydrocarbon, and NORM. The ODH reactor is configured to receive the feed stream and react the hydrocarbon with the oxygen to form a dehydrogenated hydrocarbon and water. The effluent stream includes the dehydrogenated hydrocarbon, water, unreacted hydrocarbon, and NORM. The processing unit is configured to process the effluent stream to form product stream and a recycle stream. The product stream includes the dehydrogenated hydrocarbon. The recycle stream includes unreacted hydrocarbon and NORM. The NORM reduction unit is configured to reduce an amount of the NORM in the recycle stream to produce a NORM-reduced recycle stream. The ODH reactor is configured to receive the NORM-reduced recycle stream.

Methods and systems for operating and NGL recovery process are provided. In an exemplary method, an absorber column upstream of a fractionator column is operated at a higher pressure than a pressure in the fractionator column. An NGL (C.sub.3 plus) stream is taken from the bottom of a fractionator column and then ethylene/ethane stream is taken from the top of the fractionator column. A differential pressure between the absorber column and the fraction are column is controlled based, at least in part, on a flow rate of the fractionator feed stream from the absorber column to the fractionator column.

Methods and systems for operating and NGL recovery process are provided. In an exemplary method, an absorber column upstream of a fractionator column is operated at a higher pressure than a pressure in the fractionator column. An NGL (C.sub.3 plus) stream is taken from the bottom of a fractionator column and then ethylene/ethane stream is taken from the top of the fractionator column. A differential pressure between the absorber column and the fraction are column is controlled based, at least in part, on a flow rate of the fractionator feed stream from the absorber column to the fractionator column.

A method for selectively hydrogenating acetylene in a cracked gas from a steam cracking unit for producing olefins may include separating a hydrogenation feed from the cracked gas. The hydrogenation feed may include acetylene, hydrogen, carbon monoxide, and at least one product. The method may further include contacting the hydrogenation feed with an acetylene hydrogenation catalyst, the contacting causing hydrogenation of at least a portion of the acetylene of the hydrogenation feed to produce a hydrogenation effluent. In response to a change in a composition of a feedstock to the steam cracking unit that results in a change in a hydrogen concentration in the hydrogenation feed, the method may further include determining the hydrogen concentration in the hydrogenation feed and increasing or decreasing a temperature of the hydrogenation feed based on the determined hydrogen concentration of the hydrogenation feed.