TECHNOLOGY FOCUS - INDUSTRIAL STANDARDS - Preferred Process: In the process, the biomass feedstock comprises lignin. Removing at least one constituent from the biomass feedstock comprises removing at least a portion of the lignin from the biomass feedstock. Adding at least one constituent to the biomass feedstock comprises adding a catalyst to the biomass feedstock. The catalyst is at least one catalyst selected from: sodium carbonate and sodium hydroxide. Alternatively, the process comprises: reducing the particle size of a biomass feedstock comprising lignin; contacting the biomass feedstock with a lignin extraction solution to remove at least a portion of the lignin and to generate a biomass product; reducing the particle size of the biomass product; suspending the biomass product in an aqueous solution to produce an aqueous biomass slurry; processing the aqueous biomass slurry. The process is continuous. The particle size of the biomass feedstock is reduced to a particle size range of 2-20 mm. The particle size of the biomass product is reduced to a particle size range of 24 mu m to 2 mm. The lignin extraction solution is selected from: methanol, ethanol, propanol, isopropyl alcohol, acetone and water. Contacting the biomass feedstock with the lignin extraction solution comprises contacting the biomass feedstock with the lignin extraction solution in a column facilitating countercurrent flow between the biomass feedstock and the lignin extraction solution. Processing the aqueous biomass slurry comprises: pressurizing and heating the aqueous biomass slurry to generate an alternative petrochemical feedstock; cooling the alternative petrochemical feedstock to an ambient temperature; depressurizing the alternative petrochemical feedstock; and recovering at least one component of the alternative petrochemical feedstock. The alternative petrochemical feedstock comprises at least one component selected from: crude oil, a hydrocarbon, a green chemical and water. EXAMPLE - No suitable example given.