'Green' fertilizer and melamine can be obtained by product greening. 1. What do we mean with product greening ? 2. Illustrate product greening of the fertilizer and melamine process in a flowsheet. You can use the flowsheet of assignment 1 for this. 3. Give 2 alternative feed stocks to obtain green fertilizer and . Below we have presented some alternatives for natural gas feed stock based on the reference flow of 1kg hydrogen production. Above the arrows you find the energy that is needed for the reactions. These are based on the enthalpy of formation. You will learn more about the energy of formation the next weeks. Not all of them result in 'green hydrogen'. 4. What is 'green', 'blue', 'green' and 'turquoise' hydrogen? 5. How many extra energy would Chemelot need when comparing the alternatives with the current process when using 200kton of hydrogen per year? 6. Assuming that the heat input comes from renewable electricity, in this case from wind turbines, how many wind turbines would you need for each alternative for the 200kton per year hydrogen? 7. Which alternative would you choose to proceed with and why