TiO2-Based Capture Mass for Halogen Removal in Synthesis Gas
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Solution Overview
Problem
Existing purification methods for synthesis gas, particularly those using basic aluminas, are inadequate in capturing halogenated impurities like HF, HCl, and HBr, with limited temperature use and low capture capacity, often requiring cooling and resulting in catalyst poisoning and reduced performance in Fischer-Tropsch synthesis processes.
Innovation Solution
A composition based on TiO2 with 30-99% by weight TiO2 and 1-30% by weight of alkaline earth metal sulfates, such as calcium sulfate, is used as a capture mass to effectively remove halogenated impurities at high temperatures, maintaining catalytic activity and stability for hydrolysis reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If basic aluminas are used for capturing halogenated impurities, then the capture capacity is limited and temperature use is restricted, but the process requires cooling and results in low capture efficiency
Solution Approach 1:
The patent changes the material parameters by replacing basic alumina with a composite composition containing TiO2 (30-99 wt%) and alkaline earth metal sulfates (1-30 wt%, preferably calcium sulfate). This parameter change enables the capture mass to operate effectively at higher temperatures (up to 350°C) while significantly improving halogenated impurity capture capacity, resolving the contradiction between temperature range and capture efficiency
Solution Approach 2:
The patent employs a composite material system combining TiO2 with alkaline earth metal sulfates (particularly calcium sulfate) to create a capture mass that exhibits both high thermal stability and enhanced halogen capture capacity. The composite structure allows the material to maintain effectiveness at elevated temperatures where basic aluminas fail, while providing superior capture performance through the synergistic interaction between TiO2 and the sulfate components
2Reliability
If conventional purification methods are used, then halogenated impurities are removed, but catalyst poisoning occurs and performance is reduced in Fischer-Tropsch synthesis processes
Solution Approach 1:
The patent changes the chemical composition parameters of the capture mass by using TiO2-based composite with alkaline earth metal sulfates instead of conventional basic aluminas or solvents. This parameter change enables selective capture of halogenated impurities (HF, HCl, HBr, HI) to residual levels below 10 ppb, effectively preventing catalyst poisoning while maintaining Fischer-Tropsch synthesis performance without requiring additional catalyst protection measures
3Reliability
If solvent washing techniques are used to eliminate halogenated compounds, then the compounds react chemically with the solvent, but the process is complex and requires additional steps
Solution Approach 1:
The patent extracts the purification function into a single solid-phase capture mass consisting of TiO2 and alkaline earth metal sulfates that directly contacts the synthesis gas. This eliminates the need for liquid solvent systems, associated chemical reactions, and complex regeneration processes. The solid capture mass physically adsorbs and chemically binds halogenated impurities in a single straightforward step, dramatically simplifying the overall purification process while maintaining high effectiveness
Solution Approach 2:
The TiO2-based composite with alkaline earth metal sulfates acts as an intermediary substance that facilitates the removal of halogenated impurities through direct contact with synthesis gas. The intermediate capture mass provides a stable, reusable platform that captures impurities without requiring complex solvent systems or multiple processing steps, thereby reducing process complexity while ensuring thorough purification
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 TiO2 composition achieves halogenated impurity removal to residual levels below 10 ppb, with no deactivation of catalytic properties, allowing for efficient purification of synthesis gas at elevated temperatures without cooling, suitable for use in Fischer-Tropsch synthesis units.
Implementation Method 1
a composition based on TiO2 and comprising between 30% by weight and 99% by weight of TiO2 and between 1% by weight and 30% by weight of at least one sulfate of an alkaline earth metal chosen from calcium, barium, strontium and magnesium
Implementation Method 2
maintaining catalytic activity and stability for hydrolysis reactions
Implementation Method 3
simultaneously hydrolyze COS and HCN
Data Source
AI summary
Use of a TiO2-based composition for the capture of halogenated compounds contained in a gaseous mixture, said composition comprising between 10 wt% and 100 wt% of TiO2 and between 1 wt% and 30 wt% of at least one sulfate of an alkaline earth metal selected from calcium, barium, strontium and magnesium.