Pulsed Compression Reactor for Catalyst-Free Chemical Synthesis
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Solution Overview
Problem
Existing chemical production methods using flow and fixed reactors face challenges such as high reactant purity requirements, difficult controllability, long start-up times, and limited versatility due to the use of specific catalysts for each reaction, which restricts their ability to dynamically respond to changes in inlet conditions and results in low selectivities.
Innovation Solution
Combining carbon-containing compound production with pulsed compression reactors, utilizing an electronic control system to optimize operating parameters like reaction temperature, residence time, and reactant composition, and integrating with other reactor types like fixed-bed or fluidized-bed reactors to produce hydrocarbons, alcohols, and ammonia, allowing for rapid adjustment of operating conditions to produce a variety of products with the same apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flow and fixed reactors are used for chemical production, then the reactors are inexpensive and easy to fabricate, but they have high requirements for reactant purity and difficult controllability
Solution Approach 1:
The patent applies pulsed compression technology that dynamically adjusts operating parameters (pressure, temperature, residence time) during operation. The reactor system transitions from static flow/fixed-bed configurations to a dynamic system where compression ratios, temperatures up to 1000K, and pressures up to 100 bar are varied periodically to optimize reaction conditions in real-time, enabling dynamic response to changing inlet conditions.
Solution Approach 2:
The invention changes fundamental operating parameters by using pulsed compression to achieve high temperatures (1000K+) and high pressures (100 bar) during operation. The system varies compression ratio, temperature, and pressure over time to control reaction rates and selectivity, allowing the same reactor to handle different reactant compositions and produce various chemical products.
2Productivity
If catalysts containing zinc, iron, or nickel are used for specific reactions, then the reactions proceed efficiently, but the reactors are designed for one specific reaction and cannot be used for other reactions
Solution Approach 1:
The patent extracts and eliminates the catalyst component from the reaction system. Instead of using specific catalysts (zinc for methanol, iron for ammonia, nickel for methane) that are tailored to single reactions, the invention employs pulsed compression to initiate and drive reactions directly, removing the limitation of catalyst specificity while maintaining high reaction efficiency.
Solution Approach 2:
The pulsed compression reactor system achieves multi-functionality by using the same apparatus to produce different chemical products (methane, methanol, ethanol, ammonia) by adjusting operating parameters. The system can handle various reactant compositions (CO, CO2, H2, N2) and produce different products based on temperature, pressure, and residence time control, making a single reactor versatile for multiple chemical synthesis reactions.
3Productivity
If high temperatures and pressures are used to achieve sufficient activation energy, then the reactions start, but the selectivity of the reaction is reduced
Solution Approach 1:
The patent employs periodic pulsed compression cycles where high temperatures and pressures are achieved only during the compression phase, followed by expansion and cooling. This periodic action allows the system to reach activation energy thresholds for reaction initiation while limiting the duration of high-energy conditions, thereby maintaining selectivity by preventing excessive thermal degradation or unwanted side reactions.
Solution Approach 2:
The system performs preliminary compression and heating to reach activation energy before the main reaction occurs. By pre-compressing reactants to high pressures and pre-heating to high temperatures during the compression stroke, the reaction is initiated at the optimal moment, while the subsequent expansion and cooling phases prevent runaway reactions and maintain product selectivity.
4Temperature
If pulsed compression reactors are used to produce chemical compounds, then high temperatures and pressures can be represented for a short time, but additional valves, compressors, and inert gas injection are required
Solution Approach 1:
The patent merges the compression and reaction functions into a single integrated pulsed compression reactor system. The compression mechanism directly drives the reaction chamber, combining what would traditionally be separate compression and reaction zones into one unified system. This integration reduces the need for separate valves, compressors, and inert gas injection systems while achieving the required high temperatures and pressures.
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 enables the production of hydrocarbons and ammonia with high calorific values, improved selectivity, and flexibility in product range, while reducing the need for multiple reactors and catalysts, and allows for dynamic operation and efficient energy utilization.
Implementation Method 1
this gas mixture is then compressed via a piston and thus heated
Implementation Method 2
this gas mixture is then compressed via a piston and thus heated
Implementation Method 3
the desired reaction is initiated by the raised temperature
Implementation Method 4
the pressure and thus the temperature drop again due to the piston movement
Implementation Method 5
What all the above reactions have in common is that they take place on a technical scale by heterogeneous catalysis on solid catalysts
Data Source
AI summary
The process and apparatus according to the invention allow the production of hydrocarbons and ammonia without the use of catalysts. For this purpose, waste gases containing CO2 or N2 from an upstream process are fed to compression reactors. In addition, hydrogen from an electrolyzer is fed to these reactors to enable hydrogenation of the fed substances. Methane, alcohols and ammonia, for example, can be produced by this process. In order to increase the yield of the process, it is planned to raise the reactant pressure with the aid of a compressor.