The Need

Many industrial gas–solid reactions, such as ironmaking, chemical looping, and other redox-based processes, are fundamentally constrained by thermodynamic equilibrium in conventional reactor designs. Single-inlet/single-outlet reactors force tradeoffs between gas conversion and solid conversion, often resulting in mixed or suboptimal product streams. This limitation drives the need for costly downstream separation, recycling, and additional unit operations, increasing both capital and operating costs while reducing overall process efficiency and flexibility.

The Technology

OSU engineers have developed a flexible gas–solid reactor design that uses staged reactant injection and/or extraction at multiple locations along the reactor. By strategically controlling local gas-to-solid ratios within the reactor, the system reshapes the effective thermodynamic operating window, enabling higher conversion of targeted gas and/or solid products than is possible in conventional designs. The approach is modular and adaptable, allowing integration into existing reactor types while improving product quality and process performance.

Commercial Applications

• Direct reduced iron (DRI) production in shaft furnaces
• Chemical looping hydrogen production and syngas upgrading
• Gas–solid redox reactors for CO₂ capture and utilization
• Advanced metallurgical or catalytic gas–solid processing systems

Benefits/Advantages

• Higher effective conversion
• Reduced downstream processing
• Lower energy consumption and operating costs
• Modular, retrofit-friendly design