Formic Acid Dehydrogenation Reactor With External Temperature Control
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Solution Overview
Problem
Existing methods for hydrogen production from formic acid often result in high carbon monoxide (CO) generation due to inadequate temperature control, leading to impure hydrogen production.
Innovation Solution
A reactor system with a temperature control arrangement outside the reactor space, a tangentially directed inflow conduit for mixing, and a pump for controlled mixture introduction, ensuring uniform temperature and mixing without mechanical stirrers, using a catalyst like Ru-based complexes for formic acid dehydrogenation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating means is provided in the reactor space to heat the mixture, then the dehydrogenation reaction can proceed, but relative high local temperatures may result in relatively large CO generation rate and impure hydrogen production
Solution Approach 1:
The heating means is extracted from the reactor space and placed outside. The mixture is heated externally in a heat exchanger and then introduced into the reactor space at a controlled temperature, avoiding direct heating within the reactor that would cause local high temperatures and excessive CO generation.
Solution Approach 2:
A heat exchanger serves as an intermediary device between the heat source and the reactor space. It allows thermal energy to be transferred to the mixture without placing heating elements directly in the reactor, thereby controlling temperature uniformly and preventing localized overheating that leads to CO formation.
2Productivity
If pump is used to circulate the mixture, then continuous processing is enabled, but pump life may be reduced due to exposure to high temperatures
Solution Approach 1:
The pump is positioned outside the reactor space, extracting it from the high-temperature environment. This allows continuous circulation and processing while protecting the pump from thermal damage that would reduce its lifespan.
Solution Approach 2:
The mixture is heated to the required temperature before being introduced into the reactor space, using a heat exchanger positioned after the pump. This preliminary heating approach ensures the pump operates at lower temperatures, extending its life while maintaining continuous processing capability.
3Stability of the object's composition
If mechanical stirrer is added to the reactor space for mixing, then mixing efficiency is improved, but device complexity increases
Solution Approach 1:
The mechanical stirrer is replaced by introducing the mixture in a tangential direction to create a circulating flow pattern. This fluid dynamic approach achieves effective mixing without mechanical moving parts inside the reactor space, reducing device complexity while maintaining mixture uniformity.
Solution Approach 2:
The inflow conduit is designed to introduce the mixture tangentially, creating a hydraulic flow pattern that generates circulating motion. This uses fluid mechanics rather than mechanical agitation to achieve mixing, eliminating the need for complex mechanical stirrers.
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
The system produces relatively pure hydrogen by minimizing CO generation through precise temperature control and efficient mixing, extending pump life and reducing operational costs.
Implementation Method 1
a catalyst provided in the fuel cells may be negatively affected by carbon monoxide... a relative accurate control of the temperature of formic acid and the catalyst is beneficial for realizing a relative low rate of CO generation and thereby producing relative pure hydrogen from formic acid
Implementation Method 2
The system is provided with a pump, communicatively coupled for fluid flow, via said mixture inflow opening and said mixture outflow opening, to said reactor space, wherein said pump is arranged for withdrawing, via said mixture outlet opening, said mixture from said reactor space and introducing, via said inflow conduit, said mixture into said reactor space
Implementation Method 3
The system may comprise a temperature control arrangement, communicatively coupled for fluid flow to said pump, wherein said temperature control arrangement is arranged outside the reactor space for heating and/or cooling, in use, said mixture withdrawn from said reactor space to a predetermined temperature range
Implementation Method 4
The system may comprise a temperature control arrangement, communicatively coupled for fluid flow to said pump, wherein said temperature control arrangement is arranged outside the reactor space for heating and/or cooling, in use, said mixture withdrawn from said reactor space to a predetermined temperature range
Implementation Method 5
The inflow conduit is arranged such that said mixture, in use, is introduced in said reactor space, via said mixture inflow opening, in a predetermined direction having a tangential component, preferably arranged for stirring and/or mixing, in use, said mixture in said reactor space
Data Source
AI summary
The system includes a reactor vessel having a reactor space bound by a reactor wall. The reactor vessel is arranged for holding a mixture of a catalyst and formic acid in the reactor space. The reactor vessel includes a mixture inflow opening for allowing the mixture to enter the reactor space and a mixture outflow opening for allowing said mixture to exit the reactor space, and a gas outflow opening for allowing hydrogen originating from the mixture to exit the reactor space. A method for hydrogen production includes providing the formic acid and the catalyst into the reactor space; withdrawing the mixture from the reactor space; heating and/or cooling the mixture to a predetermined temperature range outside the reactor space; and introducing the heated and/or cooled mixture into the reactor space in a predetermined direction having a tangential component arranged for stirring said mixture in the reactor space.