Biomass Fischer-Tropsch Process Halogen Removal
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Solution Overview
Problem
Existing biomass conversion processes for producing synthetic hydrocarbons via Fischer-Tropsch synthesis face challenges with high levels of halogenated compounds causing corrosion and catalyst poisoning, and inefficiencies in production yields and energy/economic performance, while also needing to meet stringent environmental constraints.
Innovation Solution
An integrated process that includes pretreatment of biomass, gasification, synthesis gas conditioning with halogenated compound elimination, catalytic hydrolysis, and recombination, followed by Fischer-Tropsch synthesis and subsequent hydrotreatment/isomerization, to enhance yield and efficiency while reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biomass is used as feedstock for Fischer-Tropsch synthesis, then renewable hydrocarbon production is achieved, but halogenated compounds cause catalyst poisoning and corrosion
Solution Approach 1:
The patent extracts and removes halogenated compounds from the synthesis gas stream through a dedicated purification train including guard beds and washing stages, separating the harmful impurities from the useful syngas components before Fischer-Tropsch synthesis
Solution Approach 2:
The patent applies preliminary purification actions before the main Fischer-Tropsch synthesis process, including pre-treatment of biomass feedstock and pre-cleaning of synthesis gas to remove halogenated compounds that would otherwise poison catalysts during the main reaction
2Productivity
If conventional gasification and synthesis processes are used, then hydrocarbon production is achieved, but energy efficiency and production yields are insufficient
Solution Approach 1:
The patent merges the gasification and Fischer-Tropsch synthesis operations into an integrated process train, combining multiple functions (gasification, purification, synthesis, and product upgrading) into a unified system that improves overall energy efficiency and production yield
Solution Approach 2:
The patent implements multi-functional process units that perform multiple operations, such as the synthesis gas conditioning system that simultaneously removes multiple types of impurities (halogenated compounds, COS, HCN, acid gases) and adjusts gas composition, reducing the need for separate dedicated equipment
3Reliability
If comprehensive purification steps are added to remove halogenated compounds, then catalyst protection is improved, but process complexity increases
Solution Approach 1:
The patent segments the purification process into distinct functional stages (halogenated compound removal, COS/HCN hydrolysis, acid gas removal, final polishing) with dedicated units for each function, allowing each stage to be optimized independently while maintaining overall system manageability
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 process effectively removes halogenated compounds, improves energy and economic performance, and reduces greenhouse gas emissions, achieving higher production yields and better environmental compliance.
Implementation Method 1
a step d2) of eliminating the halogenated compounds by passing said first part over at least one suitable guard bed
Implementation Method 2
a stage d4) of catalytic hydrolysis of the compounds COS and HCN contained in the said complementary part of the effluent resulting from stage d1) into H2S and NH3
Implementation Method 3
i) a catalytic synthesis reaction step Fischer-Tropsch performed on the effluent from step h)
Data Source
AI summary
The invention relates to an integrated method for the production of liquid hydrocarbons from a feedstock containing at least one fraction of biomass and optionally at least one fraction of another feedstock, said method comprising at least one pre-treatment step, a gasification step, a synthesis gas conditioning step, a water washing step, an acid gas removal step, a final purification step, a Fischer-Tropsch synthesis catalytic reaction step.