Packed-Bed Phosphorus Production for High-Purity Low-Energy Recovery
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Solution Overview
Problem
Existing methods for producing phosphorus from phosphoric acid using carbon materials face challenges in achieving stable and high-purity liquid phosphorus production, with issues such as inefficient reaction conditions and difficulty in separating polyphosphoric acid compounds, limiting industrial application.
Innovation Solution
A method involving a flow reaction with a nonoxidizing gas flow, where phosphorus oxide generated from a liquid phosphoric acid compound is reduced in a carbon material-packed bed and subsequently condensed in a condensation accelerator-packed bed, optimizing reaction conditions to achieve high-purity liquid phosphorus production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If phosphorus is produced from phosphorus ores by smelting reduction in an electric furnace, then high-purity phosphorus can be obtained, but high-temperature reaction is required and electric power consumption is extremely high
Solution Approach 1:
The invention changes the reaction temperature parameter from high-temperature smelting reduction (1300-1600°C) to low-temperature carbonization (200-500°C). This is achieved by using phosphoric acid and carbon materials as reactants instead of phosphorus ores, fundamentally altering the thermal conditions required for phosphorus production while maintaining high purity output
Solution Approach 2:
The invention uses phosphoric acid as an intermediate compound that copies or represents the phosphorus content from phosphorus ores, but allows production through a different chemical pathway (carbonization instead of smelting reduction). This copying approach enables the same end product to be obtained through a lower-energy process
2Quantity of substance
If phosphorus components in steel making slag or sewage sludge are directly used as raw material, then phosphorus production can be achieved, but the phosphorus content is low and the process is inefficient
Solution Approach 1:
The invention performs preliminary concentration of phosphorus components by converting them into phosphoric acid before the actual phosphorus production process. This preliminary action transforms low-concentration phosphorus sources into a concentrated form (phosphoric acid) that is then ready for efficient carbonization, thereby resolving the contradiction between low raw material content and production efficiency
Solution Approach 2:
Phosphoric acid serves as an intermediary substance that bridges the gap between low-concentration phosphorus sources (steel making slag, sewage sludge) and the final phosphorus product. The intermediary form allows for efficient processing and high-yield conversion while accepting diverse low-grade raw materials
3Manufacturing precision
If phosphoric acid is reduced to phosphorus, then high-purity phosphorus can be obtained, but the reduction process requires optimization to achieve stable production
Solution Approach 1:
The invention applies local quality by using carbon materials with specific properties (high carbon content, appropriate particle size, reactive characteristics) in the reduction process. The localized optimization of carbon material selection and reaction conditions ensures both high purity phosphorus production and stable, reliable operation of the process
Solution Approach 2:
The invention achieves continuous production by maintaining optimized reaction conditions throughout the carbonization process. The continuous flow reaction system with controlled parameters ensures uninterrupted phosphorus production at high purity levels, resolving the stability issue
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
This method enables the stable and quantitative production of high-purity liquid phosphorus, utilizing abundant phosphorus resources in steel making slag and sewage sludge, and reduces energy consumption by operating at lower temperatures.
Implementation Method 1
heating a phosphoric acid compound, generating gaseous phosphorus (vapor)
Implementation Method 2
bringing the generated phosphorus oxide into contact with a solid (solid phase) carbon material to reduce the phosphorus oxide
Implementation Method 3
condensing the gaseous phosphorus to obtain liquid phosphorus (liquid phase)
Data Source
AI summary
A method for producing phosphorus in which a reaction for forming gaseous phosphorus (g) by bringing phosphorus oxide generated by heating a liquid phosphoric acid compound into contact with a carbon material to reduce the phosphorus oxide and for condensing the gaseous phosphorus (g) to obtain liquid phosphorus (L) is conducted by a flow reaction with a nonoxidizing gas flow, wherein the reduction reaction of the phosphorus oxide is conducted in a carbon material-packed bed, and the condensation of the formed gaseous phosphorus (g) is substantially conducted in a condensation accelerator-packed bed which is disposed downstream of the carbon material-packed bed in contact with the carbon material-packed bed.