Direct Diesel Synthesis Catalyst for Distributed GTL Plants
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Solution Overview
Problem
Traditional Gas to Liquids (GTL) processes require costly and complex hydrocracking and upgrading steps to produce diesel fuel, which are not economically viable for smaller, distributed production plants that produce less than 10,000 barrels per day, as they involve significant expense and complexity.
Innovation Solution
A catalytic process using a unique catalyst system that directly converts synthesis gas into diesel fuel with high yields, primarily producing diesel fuel and a small amount of light wax, where the wax is recycled to produce additional syngas, eliminating the need for traditional hydrocracking and upgrading steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional Fischer-Tropsch processes are used to produce high molecular weight waxes, then the catalytic conversion efficiency is improved, but additional hydrocracking and upgrading processes are required which increase plant complexity and cost
Solution Approach 1:
The patent modifies the Fischer-Tropsch synthesis parameters by controlling temperature (200-400°C), pressure (1-10 atm), and catalyst composition (Fe, Co, Ni with promoters) to shift product distribution toward diesel-range hydrocarbons (C5-C20) rather than high molecular weight waxes, eliminating the need for subsequent hydrocracking units
Solution Approach 2:
The patent segments the product distribution by using multiple catalysts with different selectivity characteristics in series or parallel configurations, where the first catalyst produces a broad distribution and subsequent catalysts refine the product toward diesel range, replacing the need for complex downstream processing
2Reliability
If traditional Fischer-Tropsch processes with hydrocracking are used, then diesel fuel can be produced, but the process becomes economically unviable for distributed plants producing less than 10,000 barrels per day
Solution Approach 1:
The patent extracts and eliminates the hydrocracking and upgrading process steps from the traditional Fischer-Tropsch configuration, using modified catalyst systems that directly produce diesel-range hydrocarbons, thereby removing the expensive downstream processing infrastructure needed for small-scale plants
Solution Approach 2:
By changing the catalyst composition parameters (adding promoters like Ru, Pt, Pd to Fe or Co bases) and operating conditions (lower temperatures, moderate pressures), the process directly yields diesel fuel (C5-C20) without requiring the high-pressure hydrocracking units that make traditional GTL economically unviable for distributed applications
3Reliability
If hydrocracking and upgrading processes are employed, then F-T wax can be converted to diesel, but significant expense and complexity are added to the plant design
Solution Approach 1:
Instead of producing waxes and then cracking them down to diesel through complex hydrocracking processes, the patent inverts the approach by using modified Fischer-Tropsch catalysts that directly synthesize diesel-range hydrocarbons in the desired molecular weight range, eliminating the need for downstream conversion units
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 process enables the economical production of diesel fuel with high cetane content and improved lubricity, suitable for blending with petroleum diesel, while reducing sulfur content and engine emissions, making it suitable for distributed GTL plants without the need for costly refining processes.
Implementation Method 1
The catalytic hydrogenation of carbon monoxide to produce light gases, liquids and waxes, ranging from methane to heavy hydrocarbons (C100 and higher) in addition to oxygenated hydrocarbons, is typically referred to Fischer-Tropsch (or F-T) synthesis
Implementation Method 2
The catalytic hydrogenation of carbon monoxide to produce light gases, liquids and waxes, ranging from methane to heavy hydrocarbons (C100 and higher) in addition to oxygenated hydrocarbons, is typically referred to Fischer-Tropsch (or F-T) synthesis
Data Source
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AI summary
A unique process and catalyst is described that operates efficiently for the direct production of a high cetane diesel type fuel or diesel type blending stock from stochiometric mixtures of hydrogen and carbon monoxide. This invention allows for, but is not limited to, the economical and efficient production high quality diesel type fuels from small or distributed fuel production plants that have an annual production capacity of less than 10,000 barrels of product per day, by eliminating traditional wax upgrading processes. This catalytic process is ideal for distributed diesel fuel production plants such as gas to liquids production and other applications that require optimized economics based on supporting distributed feedstock resources.