Ammonia Reactor with Absorbent for Conversion Efficiency
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Solution Overview
Problem
The Haber-Bosch process for ammonia production is limited by thermodynamics to less than 20% conversion in a single pass, requiring high energy consumption and capital expenditures, and releases CO2 due to the use of natural gas-derived hydrogen.
Innovation Solution
An apparatus and method that combine a catalyst and an absorbent within a reactor to convert nitrogen and hydrogen to ammonia, with the absorbent selectively absorbing ammonia to reduce reverse reactions and enhance conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Haber-Bosch process is used for ammonia production, then ammonia can be produced continuously, but the conversion rate is limited to less than 20% in a single pass due to thermodynamic constraints
Solution Approach 1:
The patent applies preliminary action by introducing an absorbent material into the reactor that selectively absorbs ammonia as it forms, removing the product from the reaction equilibrium before thermodynamic limitations can prevent further conversion. This continuous removal of ammonia drives the reaction forward beyond the conventional 20% single-pass conversion limit.
Solution Approach 2:
The absorbent material acts as an intermediary substance that mediates between the catalyst and the product ammonia. It selectively binds to ammonia molecules, facilitating their removal from the reaction zone and enabling the catalyst to continue converting nitrogen and hydrogen without being constrained by product accumulation and thermodynamic equilibrium.
2Productivity
If high pressures and temperatures are used in the Haber-Bosch process to improve conversion, then ammonia production increases, but energy consumption and capital expenditures increase tremendously
Solution Approach 1:
The patent applies parameter changes by modifying the reaction conditions through the presence of the absorbent material. Instead of relying solely on high temperature and pressure to drive conversion, the system changes the effective equilibrium position through continuous product removal, allowing operation at lower temperatures and pressures while maintaining high conversion rates.
Solution Approach 2:
The patent substitutes the mechanical approach of using high pressure to force conversion with a chemical approach using selective absorption. The absorbent material chemically binds to ammonia, replacing the need for extreme mechanical conditions and reducing the energy input required for compression and heating.
3Manufacturing precision
If ammonia is separated from unreacted N2 and H2 after the reactor, then pure ammonia is obtained, but the unreacted gases must be repressurized, reheated, and recycled requiring large capital expenditures
Solution Approach 1:
The patent merges the reaction and separation functions into a single integrated reactor system. The absorbent material performs the separation function within the reactor itself by selectively absorbing ammonia, eliminating the need for separate downstream separation equipment and complex recycling systems for unreacted gases.
Solution Approach 2:
The reactor system achieves multi-functionality by combining catalytic conversion and product separation in one unit. The absorbent material provides the separation function while the catalyst provides the conversion function, allowing the single reactor to perform both roles that traditionally required separate equipment.
4Productivity
If the Haber-Bosch process is used, then ammonia production is established, but CO2 emissions are released due to steam reforming of natural gas for hydrogen production
Solution Approach 1:
The patent applies the blessing in disguise principle by using the absorbent material to convert the harmful effect of thermodynamic equilibrium limitations into a benefit. The same absorption mechanism that drives high conversion also enables the system to potentially integrate with alternative hydrogen sources, as the core innovation lies in the reaction-separation integration rather than the hydrogen production method itself.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves higher ammonia conversion rates and reduces energy consumption and equipment size, while minimizing CO2 emissions by promoting further conversion of reactants to product.
Implementation Method 1
a catalyst configured to convert the nitrogen and the hydrogen to a reaction mixture comprising ammonia
Implementation Method 2
an absorbent configured to selectively absorb a portion of the ammonia in the reactor during formation of the reaction mixture
Data Source
AI summary
Embodiments of the disclosure provide an apparatus and process for producing ammonia. The apparatus includes a reactor having (i) an inlet to receive an inlet gas comprising nitrogen and hydrogen, (ii) a catalyst and an absorbent disposed within an internal volume of the reactor, the catalyst configured to convert the nitrogen and hydrogen to a reaction mixture including ammonia, unreacted nitrogen, and unreacted hydrogen, the absorbent configured to selectively absorb a portion of the ammonia in the reactor during formation of the reaction mixture, and (iii) an outlet to discharge the reaction mixture from the reactor.