TiO2 Catalyst Process for Synthesis Gas Purification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for purifying synthesis gases are inadequate in removing sulphur-containing, nitrogen-containing, and halogen-containing impurities to stringent levels required for Fischer-Tropsch units and other chemical synthesis processes, leading to catalyst poisoning, reduced performance, and accelerated corrosion.
Innovation Solution
A process involving a TiO2-based catalyst for hydrolysing COS and HCN, followed by solvent washing and desulphurisation using a collecting or adsorbing mass, effectively reduces impurities to below 10 ppb by weight, addressing the limitations of existing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional solvent washing or collecting mass methods are used, then sulphur-containing impurities can be removed to some extent, but the removal efficiency is insufficient to achieve the stringent requirement of less than 10 ppb by weight
Solution Approach 1:
The purification process is divided into three sequential stages: (1) hydrolysis of COS and HCN using a TiO2-based catalyst, (2) solvent washing to remove hydrolysis products and halogen compounds, and (3) desulphurisation using a collecting mass. This segmentation allows each stage to target specific impurities, achieving cumulative removal efficiency that meets the stringent <10 ppb requirement while protecting catalysts in downstream processes.
2Manufacturing precision
If multiple separate purification steps are implemented to achieve ultra-low impurity levels, then purification effectiveness improves, but process complexity increases
Solution Approach 1:
The invention merges multiple purification functions into an integrated three-step process flow. The TiO2-based catalyst simultaneously handles COS hydrolysis and HCN conversion, the solvent washing step removes multiple impurity types including halogen compounds, and the collecting mass provides final desulphurisation. This combined approach achieves ultra-low impurity levels while maintaining a manageable process structure through functional integration.
3Duration of action of stationary object
If stringent impurity removal is achieved to protect catalysts, then catalyst longevity improves, but process cost and complexity increase
Solution Approach 1:
The purification process is positioned upstream of the Fischer-Tropsch unit, performing all necessary impurity removal before the synthesis catalyst is exposed to the feed gas. The three-step process (hydrolysis, solvent washing, desulphurisation) completely removes sulphur, nitrogen, and halogen compounds in advance, ensuring catalyst protection and extended lifetime without requiring complex in-situ purification systems within the Fischer-Tropsch unit itself.
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 achieves ultra-low concentrations of sulphur, nitrogen, and halogen impurities, enhancing catalyst longevity and performance in Fischer-Tropsch units and other synthesis processes while preventing corrosion.
Implementation Method 1
a joint step for hydrolysing COS and HCN contained in the gas and for collecting the halogen-containing compounds, using a TiO2-based catalyst
Implementation Method 2
a joint step for hydrolysing COS and HCN contained in the gas and for collecting the halogen-containing compounds, using a TiO2-based catalyst
Implementation Method 3
a solvent washing step
Implementation Method 4
a step for desulphurisation on a collecting or adsorbing mass
Data Source
AI summary
The invention relates to a process for finally removing sulphur-containing, nitrogen-containing and halogen-containing impurities contained in a synthesis gas, said process including:a) a joint step for hydrolysing COS and HCN contained in the gas and for collecting the halogen-containing compounds, using a TiO2-based catalyst,b) a washing step using a solvent,c) a step for desulphurization on a collecting or adsorbing mass.The synthesis gas purified in accordance with the process of the invention contains less than 10 ppb by weight, less than 10 ppb by weight of nitrogen-containing impurities and less than 10 ppb by weight of halogen-containing impurities.