Zinc Ferrite Capture Mass for Deep Desulfurization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The presence of sulfur-containing impurities in feeds used for hydrogen production, such as those derived from denaturing agents in alcohol-rich feeds, leads to catalyst deactivation and challenges in deep purification processes like PSA or palladium-based membranes, as existing desulfurization methods are inadequate for removing refractory sulfur compounds.
Innovation Solution
A process utilizing a capture mass comprising iron oxides or zinc oxides with more than 20% by weight of zinc ferrite to capture sulfur from oxygen-containing compounds and hydrocarbon-containing feeds, operating at temperatures between 200°C to 400°C, which effectively reduces sulfur content and minimizes catalyst deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional desulfurization methods are used, then some sulfur removal is achieved, but refractory sulfur compounds remain and catalyst deactivation occurs
Solution Approach 1:
The invention changes the chemical composition parameters of the desulfurization agent by incorporating zinc ferrite (ZnFe2O4) as the active phase, which fundamentally alters the desulfurization mechanism to enable effective removal of refractory sulfur compounds that conventional methods cannot handle, thereby preventing catalyst deactivation
Solution Approach 2:
The invention uses a composite material consisting of zinc ferrite combined with other metal oxides (such as ZnO, Fe2O3, Al2O3, SiO2) to create a desulfurization agent with enhanced properties that simultaneously achieve high sulfur removal efficiency and protect catalyst activity through synergistic effects of the composite components
2Reliability
If deep desulfurization is implemented to protect catalysts, then catalyst deactivation is reduced, but process complexity and cost increase
Solution Approach 1:
The zinc ferrite-based desulfurization agent performs multiple functions simultaneously: it removes various types of sulfur compounds (including refractory ones), operates under a wide range of conditions (temperature, pressure, feed composition), and protects downstream catalysts, thereby simplifying the overall process by replacing multiple specialized desulfurization steps with a single versatile unit
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 significantly reduces sulfur content in feeds, thereby limiting catalyst deactivation and enhancing the efficiency of hydrogen production by effectively capturing refractory sulfur compounds, even those resistant to conventional hydrodesulfurization operations.
Implementation Method 1
a process for desulphurizing a feed comprising oxygen-containing compounds, hydrocarbon-containing compounds and organic sulphur-containing compounds by capturing sulphur on a capture mass comprising iron oxides or zinc oxides and more than 20% by weight of zinc ferrite
Implementation Method 2
The presence of impurities in the feed, in particular sulphur-containing impurities, is deleterious, however, as it results in gradual deactivation of the catalyst
Data Source
AI summary
The invention concerns a process for desulphurizing a feed comprising oxygen-containing compounds, hydrocarbon-containing compounds and organic sulphur-containing compounds, by capturing sulphur on a capture mass comprising iron oxides or zinc oxides and more than 20% by weight of zinc ferrite. The process is operated in the presence of hydrogen at a temperature in the range 200° C. to 400° C.