RU-REA

Urea makes up roughly 50% of global nitrogen fertilizer consumption. The global urea industry faces fluctuating markets defined by high natural gas prices and stringent decarbonization mandates. The RU-REA Hybrid Process Design is a specialized framework for profitable synthesis of green urea. The process leverages high-purity CO2 captured from bioethanol facilities, transforming waste byproducts into urea, a key agricultural fertilizer. The hydrogen generation required for urea production is traditionally derived from natural gas. RU-REA utilizes a blue-green (hybrid) H2 architecture combining Steam Methane Reforming (SMR) in combination with Water Gas Shift (WGS) as well as Proton Exchange Membrane electrolysis (PEM electrolysis) to make an efficient production considering both profitability and environmental consciousness. The excess work and heat generated from both the Haber-Bosch and Bosch-Meiser processes is recycled with heat exchangers and turbines that provide heat for SMR and work for electrolysis. This heat and work integration and recovery from the ammonia and urea synthesis stages can significantly reduce energy costs associated with hydrogen generation, ultimately leading to a chemical plant that is more profitable than a traditional urea plant. The ratio of green hydrogen (from electrolysis) and blue hydrogen (from SMR and WGS) can be actively changed to match market conditions. The profitability of this plant is shielded from fluctuations of both electricity cost and natural gas prices, rather than being entirely reliant on either one.

The production ratio of green and blue hydrogen was determined using a Generalized Reduced Gradient (GRG) model with a nonlinear method that optimized for profit based on current market conditions. Thus, the RU-REA Hybrid Process proves feasible in manufacturing a necessary component in the agricultural industry using environmentally conscious and waste-reducing methods. Stable urea prices directly impact food prices. The RU-REA plant design can produce urea with a robust pricing structure, which, in turn, makes food more affordable by driving down farming costs.