Iron Oxide Desulfurizer Composition for High Sulfur Capacity
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Solution Overview
Problem
Current desulfurizers, particularly those using iron oxides, have limited sulfur capacity, are sensitive to temperature and air velocity, and require complex processes with variable raw materials, leading to instability and high costs.
Innovation Solution
A composition comprising ferroferric oxide in the cubic crystalline phase, amorphous ferric oxide, and amorphous ferric oxide monohydrate, prepared through a simple solid-phase reaction process involving ferrous compounds and hydroxides, which stabilizes the desulfurizing performance and increases sulfur capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional iron oxide desulfurizers are used, then the desulfurization function is provided, but the sulfur capacity is low and the application temperature range is narrow
Solution Approach 1:
The patent uses a composite material system consisting of ferric oxide monohydrate as the main active component (60-70 wt%), combined with specific amounts of ferric oxide (10-20 wt%), ferrous oxide (5-15 wt%), and ferroferric oxide (5-15 wt%). This multi-phase composite structure provides both high sulfur capacity and broad temperature adaptability by leveraging the complementary properties of different iron oxide phases.
Solution Approach 2:
The patent optimizes the phase composition parameters of iron oxides to achieve high sulfur capacity. Specifically, it controls the content of ferric oxide monohydrate at 60-70 wt% and adjusts the ratios of other iron oxide phases to maximize desulfurization performance across different temperatures and pressures.
2Ease of manufacture
If wet precipitation method is used to prepare desulfurizer, then iron oxides can be formed, but side-reactions occur and composition control becomes difficult
Solution Approach 1:
The patent extracts and eliminates the problematic wet precipitation step from the manufacturing process. Instead, it employs a solid-state reaction method where ferrous sulfate and sodium hydroxide are mixed and heated directly, avoiding the formation of colloidal intermediates and subsequent washing steps, thereby achieving both ease of manufacture and precise composition control.
Solution Approach 2:
The patent replaces the wet chemical precipitation process with a thermal solid-state reaction process. By using heat treatment at 50-150°C to directly convert the mixture of ferrous sulfate and sodium hydroxide into the desired iron oxide phases, it eliminates the need for liquid-phase reactions, filtration, and drying steps.
3Ease of manufacture
If ferric salt solution precipitation method is used, then iron oxides are formed, but colloidal formation occurs and washing becomes difficult
Solution Approach 1:
The patent replaces the wet precipitation method that produces colloids with a solid-state thermal reaction method. By heating the solid mixture of ferrous sulfate and sodium hydroxide, it directly forms crystalline iron oxide phases without passing through colloidal stages, thereby simplifying the manufacturing process and eliminating washing steps.
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 solution achieves a sulfur capacity of at least 40%, ensuring stable desulfurizing performance across various temperatures and pressures, with a simplified and energy-efficient production process that avoids colloidal formation issues, resulting in a cost-effective and efficient desulfurization method.
Implementation Method 1
A composition comprising ferroferric oxide in the cubic crystalline phase, amorphous ferric oxide, and amorphous ferric oxide monohydrate, prepared through a simple solid-phase reaction process involving ferrous compounds and hydroxides
Implementation Method 2
Said iron oxides are particularly suitable to serve as the desulfurizer's active components to remove the hydrogen sulfide presents in gaseous and liquid state feed stocks
Data Source
AI summary
The present invention discloses a composition for a desulfurizer with a high sulfur capacity and a process for making the same. The composition comprises the active components of three kinds of iron oxides and is used in the desulfurizer to remove hydrogen sulfide from the gaseous and liquid state feed stocks. The process for preparing the composition comprises the following steps: (1) mixing a solid ferrous compound with a solid hydroxide at a molar ratio of iron to hydroxyl being in the range from 1:2 to 1:3; (2) kneading the mixture feeds obtained in step (1) and making them react completely; (3) drying the products obtained in step (2) in the air; (4) washing and filtering the feeds obtained in the step (3); (5) naturally drying or baking the solids obtained in step (4) to form a composition for a desulfurizer with a high sulfur capacity.