Yellow Phosphorus Purification via Oxidation and Complexation
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Solution Overview
Problem
Existing methods for purifying yellow phosphorus to produce high-purity phosphoric acid face challenges such as material loss, hazardous waste, and inefficient impurity removal, particularly with strong oxidizing agents like iodine compounds, which are difficult to handle and result in low yield and environmental concerns.
Innovation Solution
A method involving the use of an oxidizing agent like hydrogen peroxide, combined with specific additives having a nitrogen-containing functional group, such as amino-tris-methylene phosphoric acid, to effectively remove metal impurities like antimony, iron, and aluminum from yellow phosphorus by forming stable complexes, thereby increasing the purity of phosphoric acid production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If strong oxidizing agents like iodine compounds are used to remove impurities from yellow phosphorus, then impurity removal effectiveness is improved, but material loss increases and hazardous waste is generated
Solution Approach 1:
The patent changes the chemical parameters by replacing strong oxidizing agents (iodine compounds) with milder oxidizing agents (hydrogen peroxide, peracetic acid) and introduces specific additives (amino acids, phosphoric acid) to modify the reaction conditions. This parameter change achieves effective impurity removal while reducing material loss and avoiding hazardous waste generation.
Solution Approach 2:
The patent introduces intermediaries (additives containing amino groups, phosphoric acid, carboxylic acids) that mediate between the oxidizing agent and the yellow phosphorus. These intermediaries facilitate impurity removal through complexation and chelation mechanisms, reducing the need for strong oxidizing agents and minimizing material loss.
2Manufacturing precision
If strong oxidizing agents like iodine compounds are used to remove impurities from yellow phosphorus, then impurity removal effectiveness is improved, but hazardous waste and environmental concerns increase
Solution Approach 1:
The patent converts the potentially harmful strong oxidizing agents into beneficial mild oxidizing agents (hydrogen peroxide decomposes to water and oxygen, peracetic acid decomposes to acetate and oxygen). This transformation eliminates hazardous waste while maintaining impurity removal effectiveness through the combined action of oxidation and complexation.
Solution Approach 2:
The patent uses inexpensive, environmentally benign additives (amino acids, phosphoric acid, carboxylic acids) that can be easily disposed of or decomposed. These short-living additives perform their function of complexing impurities and facilitating removal, then decompose without creating persistent hazardous waste.
3Manufacturing precision
If conventional purification methods are used, then impurity removal is achieved, but yield of high-purity phosphoric acid is reduced
Solution Approach 1:
The patent performs preliminary complexation of impurities with additives (amino acids, phosphoric acid) before the main oxidation step. This preliminary action pre-concentrates impurities in a removable form, allowing for more efficient separation and higher yield of pure phosphoric acid while maintaining high purity standards.
Solution Approach 2:
The patent uses intermediary substances (additives containing functional groups like amino, carboxyl, phosphoric acid groups) that selectively complex with impurity metals. These intermediaries facilitate selective impurity removal while leaving the phosphorus content intact, thereby increasing both purity and yield of the final phosphoric acid product.
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 approach significantly reduces impurity levels, minimizes material loss, and enhances the yield of high-purity phosphoric acid while being environmentally friendly, avoiding the hazards associated with strong oxidizing agents and improving waste treatment outcomes.
Implementation Method 1
adding an oxidizing agent to the yellow phosphorus, followed by stirring
Implementation Method 2
adding a solution including an additive having a nitrogen-containing functional group, such as amino-tris-methylene phosphoric acid, to effectively remove metal impurities like antimony, iron, and aluminum from yellow phosphorus by forming stable complexes
Data Source
AI summary
The present invention relates to a method of purifying yellow phosphorus, and more particularly, to a method of effectively removing impurities from yellow phosphorus used as raw materials of a phosphoric acid to increase purity of the phosphoric acid, the method including: removing impurities from the phosphoric acid by adding an oxidizing agent to the yellow phosphorus, followed by stirring; and adding a solution including an additive having a specific functional group in a chemical structure to the yellow phosphorus from which the impurities are removed, followed by stirring.