Processes for producing petrochemical products from crude oil

A process for producing petrochemical products from crude oil, the process comprising:

• separating the crude oil into at least a lesser boiling point fraction and a greater boiling point fraction;
• passing the lesser boiling point fraction and the greater boiling point fraction to a reactor system, the reactor system comprising a riser section and a downer section, wherein:
• the reactor system comprises a first substantially prism-shaped wall arranged around a central axis, the central axis oriented in a substantially vertical direction;
• the reactor system comprises a second substantially prism-shaped wall arranged around the central axis, a cross section of the second substantially prism-shaped wall surrounds the cross-section of the first substantially prism-shaped wall in a plane perpendicular to the central axis;
• an outer boundary of the downer section is defined by the first substantially prism-shaped wall in the plane perpendicular to the central axis;
• outer boundaries of the riser section are defined by the first substantially prism-shaped wall and the second substantially prism-shaped wall in the plane perpendicular to the central axis;
• cracking the lesser boiling point fraction in the riser section in the presence of a catalyst to produce a first cracking reaction product, wherein the catalyst and the lesser boiling point fraction move co-currently and in a generally upwards direction through the riser section;
• separating at least a portion of the first cracking reaction product from the catalyst such that a first cracking reaction product stream is passed out of the reactor system and the catalyst is passed to the downer section;
• cracking the greater boiling point fraction in the downer reactor in the presence of the catalyst to produce a second cracking reaction product, wherein the catalyst and the greater boiling point fraction move co-currently in a generally downward direction through the downer section;
• and
• passing the catalyst from the riser reactor to the downer reactor, from the downer reactor to a regenerator, and from the regenerator to the riser reactor, wherein an amount of coke on the catalyst is reduced in the regenerator.