Fluidized coking with carbon capture and chemical production

A method for producing synthesis gas or products derived from synthesis gas, comprising:

• exposing a feedstock comprising a T10 distillation point of 343° C. or more to a fluidized bed comprising solid particles in a reactor under thermal cracking conditions to form a 343° C.− liquid product, the thermal cracking conditions comprising 10 wt % or more conversion of the feedstock relative to 343° C., the thermal cracking conditions being effective for depositing coke on the solid particles;
• introducing steam and a stream comprising O2 and N2 into a gasifier,
• passing at least a portion of the solid particles comprising deposited coke from the reactor to the gasifier;
• exposing the at least a portion of the solid particles comprising deposited coke to gasification conditions in the gasifier to form a gas phase product comprising H2, N2, CO, and CO2 and partially gasified coke particles;
• removing at least a first portion of the partially gasified coke particles from the gasifier;
• passing at least a second portion of the partially gasified coke particles from the gasifier to the reactor;
• separating, during a first time period, CO2 from at least a portion of the gas phase product to form a dilute synthesis gas stream;
• separating, during the first time period, N2 from the dilute synthesis gas stream to form a nitrogen-containing stream and a synthesis gas stream;
• exposing, during the first time period, at least a portion of the synthesis gas stream to a catalyst in a synthesis reactor to form a chemical product;
• combining, during the first time period, a hydrocarbon-containing stream with the nitrogen-containing stream to form a low-BTU gas, at least a portion of the low-BTU gas being passed as a fuel or reagent to an additional process;
• stopping, during a second time period, the operation of the synthesis reactor, and passing, during the second time period, at least a portion of the gas phase product to the additional process.