Methanol Production via Catalytic Partial Oxidation for Offshore FPSO
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Solution Overview
Problem
Current methanol production processes, especially for off-shore applications, face inefficiencies due to low carbon-to-hydrogen ratios in synthesis gas and the need for CO2 removal, which are not suitable for floating production units like FPSO vessels.
Innovation Solution
The process involves subjecting a CO2-containing hydrocarbon feed to Catalytic Partial Oxidation (CPO) in the presence of a molar excess of H2O, followed by recycling hydrogen from blowdown gas to adjust the synthesis gas composition for methanol formation, eliminating the need for CO2 removal and optimizing the carbon-to-hydrogen ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If steam reforming is used to produce synthesis gas, then the process is suitable for conventional land-based plants, but the carbon-to-hydrogen ratio is too low and the equipment is too large and heavy for off-shore applications
Solution Approach 1:
The invention changes the fundamental reaction parameters by switching from steam reforming to catalytic partial oxidation (CPO). This parameter change transforms the synthesis gas production process to operate at lower temperatures with different stoichiometry, enabling both off-shore adaptability and improved carbon-to-hydrogen ratio. The CPO process uses a catalyst to facilitate the reaction between hydrocarbons and limited oxygen, producing synthesis gas with optimal composition for methanol synthesis while avoiding the equipment size and weight issues of conventional steam reforming.
2Quantity of substance
If CO2 is removed from the hydrocarbon feed, then the synthesis gas composition is optimized for methanol production, but the process complexity increases and CO2 removal equipment is needed
Solution Approach 1:
The invention converts the harmful effect of CO2 presence in the feedstock into a beneficial outcome. Instead of removing CO2 through complex treatment plants, the CPO process utilizes the CO2-containing hydrocarbon feed directly. The catalytic partial oxidation reaction inherently produces synthesis gas with the correct H2/CO ratio for methanol synthesis, even when CO2 is present in the feed. This approach eliminates the need for CO2 removal equipment while maintaining optimal synthesis gas composition.
3Reliability
If a dedicated gas treatment plant is used to remove CO2 and H2S, then the synthesis gas is purified, but the plant efficiency decreases and the process is not suitable for floating production
Solution Approach 1:
The invention extracts and eliminates the dedicated gas treatment plant step from the conventional methanol production process. By using catalytic partial oxidation, the process inherently produces purified synthesis gas suitable for methanol synthesis without requiring separate CO2 and H2S removal units. This extraction of the gas treatment step simplifies the overall process, improves plant efficiency, and makes the system suitable for space-constrained floating production environments while maintaining reliable gas purification through the catalytic reaction itself.
4Adaptability or versatility
If steam reforming equipment is installed on FPSO vessels, then methanol can be produced off-shore, but the equipment size and weight make it unsuitable for floating production
Solution Approach 1:
The invention replaces the heavy mechanical steam reforming system with a catalytic partial oxidation system. The CPO process uses a catalyst bed rather than large steam reformer vessels, refractory systems, and unrestrained tube systems. This substitution dramatically reduces equipment weight and size while maintaining the core function of producing synthesis gas. The lighter CPO equipment can be successfully installed on FPSO vessels, enabling off-shore methanol production that was previously impossible with conventional steam reforming technology.
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 allows for efficient methanol production in off-shore environments without the need for CO2 removal, minimizing emissions and optimizing the carbon-to-hydrogen ratio, thereby enhancing plant efficiency and suitability for FPSO operations.
Implementation Method 1
subjecting the hydrocarbon feed to Catalytic Partial Oxidation (CPO) so as to obtain a synthesis gas mixture
Implementation Method 2
the synthesis gas coming from CPO needs a further treatment, viz. a water-gas shift reaction (WGS)
Implementation Method 3
subjecting the recovered gas to pressure swing absorption so as to extract hydrogen therefrom
Implementation Method 4
subjecting the synthesis gas mixture to methanol-forming conditions together with an additonal feed of hydrogen (H2), so as to obtain methanol
Data Source
Figure 1~3
AI summary
Disclosed is a process for the production of methanol from a hydrocarbon feed. Particularly, the process is suitable for a hydrocarbon feed that has not been subjected to the removal of carbon dioxide. The process of the invention comprises the steps of (a) providing a hydrocarbon feed; (b) subjecting the hydrocarbon feed to Catalytic Partial Oxidation (CPO) so as to obtain a synthesis gas mixture; and (c) subjecting the synthesis gas mixture to methanol-forming conditions together with an additional feed of hydrogen (H2), so as to obtain methanol; wherein the hydrocarbon feed is a CO2 - containing hydrocarbon feed and wherein the Catalytic Partial Oxidation is conducted in the presence of a molar excess of H2O, and wherein the additional hydrogen feed is obtained by recovering blowdown gas obtained from the reactor in which the methanol formation takes place and subjecting the recovered gas to pressure swing absorption so as to extract hydrogen therefrom, and wherein gas remaining after hydrogen extraction is recycled as a feed to the Catalytic Partial Oxidation. The process of the invention is particularly suitable for the production of methanol in off-shore circumstances, such as by Floating Production Storage and Offloading (FPSO).