Pyrolysis Processes for Upgrading a Hydrocarbon Feed

A process for upgrading a hydrocarbon, comprising:

• determining an amount of carbon monoxide that will be present in a steam cracker effluent based, at least in part, on a composition of a hydrocarbon feed to be steam cracked, a temperature the hydrocarbon feed will be heated at during steam cracking, a residence time the hydrocarbon feed will be heated at the temperature during steam cracking, or a combination thereof;
• steam cracking the hydrocarbon feed to produce the steam cracker effluent;
• separating a tar product, a steam cracker quench oil, and a first overhead from the steam cracker effluent, wherein the first overhead comprises pygas and a process gas comprising ethylene and carbon monoxide;
• separating a second overhead comprising the process gas and a bottoms comprising the pygas from the first overhead;
• separating a hydrogen-rich gas from the second overhead, wherein the hydrogen-rich gas comprises a first portion of the carbon monoxide contained in the steam cracker effluent;
• and
• feeding at least a portion of the hydrogen-rich gas into a methanator having a predetermined size and/or a pressure swing adsorption unit having a predetermined size, thereby collectively abating at least 90 wt % of the first portion of the carbon monoxide in the hydrogen-rich gas.

A process for upgrading a hydrocarbon, comprising:

• determining an amount of carbon dioxide that will be present in a steam cracker effluent based, at least in part, on a composition of a hydrocarbon feed to be steam cracked, a temperature the hydrocarbon feed will be heated at during steam cracking, a residence time the hydrocarbon feed will be heated at the temperature during steam cracking, or a combination thereof;
• installing an amine unit having a predetermined capacity, the amine unit configured to remove a minimum amount of carbon dioxide from a second overhead comprising ethylene and carbon dioxide, wherein the predetermined capacity of the amine unit is based, at least in part, on the determined amount of carbon dioxide that will be present in the steam cracker effluent;
• installing an amine regeneration unit having a predetermined capacity, the amine regeneration unit configured to regenerate a spent amine produced in the amine unit;
• steam cracking the hydrocarbon feed to produce the steam cracker effluent;
• separating a tar product, a steam cracker quench oil, and a first overhead from the steam cracker effluent, wherein the first overhead comprises pygas and a process gas;
• separating a second overhead comprising the process gas and carbon dioxide and a first naphtha cut comprising the pygas from the first overhead;
• contacting the second overhead with an amine within the amine unit having the predetermined size to remove at least 75 wt % of the carbon dioxide in the second overhead by producing a spent amine comprising a reaction product of the amine and the carbon dioxide;
• separating a third overhead comprising ethylene and carbon dioxide and a second bottoms comprising the spent amine from the amine unit;
• and
• introducing the second bottoms into the amine regeneration unit to produce a regenerated amine and carbon dioxide.

A process for upgrading a hydrocarbon, comprising:

• determining an amount of carbon dioxide that will be present in a steam cracker effluent based, at least in part, on a composition of a hydrocarbon feed to be steam cracked, a temperature the hydrocarbon feed will be heated at during steam cracking, a residence time the hydrocarbon feed will be heated at the temperature during steam cracking, or a combination thereof;
• preparing an aqueous amine solution having a predetermined concentration of amine, wherein the predetermined concentration of the amine in the aqueous amine solution is based, at least in part, on the determined amount of carbon dioxide that will be present in the steam cracker effluent;
• steam cracking the hydrocarbon feed to produce a steam cracker effluent;
• separating a tar product, a steam cracker quench oil, and a first overhead from the steam cracker effluent, wherein the first overhead comprises pygas and a process gas comprising ethylene and carbon dioxide;
• separating a second overhead comprising the process gas and carbon dioxide and a first naphtha cut comprising the pygas from the first overhead;
• contacting the second overhead with the aqueous amine solution having the predetermined concentration of amine to produce a treated mixture that can include an amine treated second overhead and a spent aqueous amine comprising an amine salt;
• separating a third overhead comprising the amine treated second overhead and a second bottoms comprising the spent aqueous amine from the treated mixture, wherein at least 75 wt % of the carbon dioxide in the process gas is removed with the spent aqueous amine in the form of the amine salt.