Potassium Polyphosphite Production via Cross-Pipe Reactor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing fertilizer-grade potassium phosphite are hazardous, inefficient, and often result in explosive reactions, with limited formation of polyphosphites due to excessive heat and oxidation, and lack control over reactant addition, leading to inadequate bacterial disease control.
Innovation Solution
A method involving reacting phosphorous acid and potassium hydroxide at elevated temperatures (above 270°F) followed by rapid cooling to below 90°F in a cross-pipe reactor with a downstream static in-line mixer, ensuring complete reaction and minimizing oxidation, to produce a composition with at least 50% potassium polyphosphites, which effectively controls bacterial diseases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If phosphorous acid and potassium hydroxide are reacted at high temperatures to form polyphosphites, then polyphosphite formation is favored, but hydrolysis occurs yielding starting phosphate ion and acid
Solution Approach 1:
The patent applies parameter changes by carefully controlling temperature parameters during the reaction process. The reaction is conducted at elevated temperatures (above 270°F) to favor polyphosphite formation, but the temperature is precisely controlled and followed by rapid cooling to below 90°F to prevent hydrolysis. This dynamic temperature control resolves the contradiction between promoting polyphosphite formation and preventing hydrolysis.
Solution Approach 2:
The patent employs the 'rushing through' principle by implementing rapid cooling immediately after the high-temperature reaction. The quick temperature drop from above 270°F to below 90°F occurs so rapidly that hydrolysis is minimized, allowing the system to skip through the dangerous temperature zone where hydrolysis would occur, thus preserving the polyphosphite product.
2Ease of manufacture
If conventional batch processes are used to produce potassium phosphite, then production is simpler, but reactions can run away explosively and are difficult to control
Solution Approach 1:
The patent transitions from a static batch process to a dynamic continuous flow process. The cross-pipe reactor with static in-line mixer enables continuous addition of reactants with immediate mixing and temperature control. This dynamic approach allows the reaction to be precisely controlled as it progresses through the system, preventing run-away reactions while maintaining production efficiency.
Solution Approach 2:
The patent segments the reaction process into distinct zones within the cross-pipe reactor system. The reactants are introduced separately and mixed in a controlled manner through the static in-line mixer, creating segmented reaction zones rather than a single uncontrolled batch reaction. This segmentation allows better control over heat generation and reaction progression.
3Temperature
If phosphorous acid is added slowly to potassium hydroxide in batch reactors, then temperature control is easier, but polyphosphite formation is limited due to excessive heat and oxidation
Solution Approach 1:
The patent implements continuous reaction and cooling action through the cross-pipe reactor system. Rather than slow batch addition, the reactants continuously flow through the reaction zone and immediately into the cooling zone, maintaining continuous useful action. This ensures polyphosphite formation occurs under optimal conditions without the limitations of batch processing, achieving both temperature control and high polyphosphite formation.
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 safely and efficiently produces a fungicidal composition with enhanced bacterial disease control, including Asiatic citrus canker and bacterial wilt, utilizing a previously unrecognized bacteriostatic mode of action, and demonstrates high polyphosphite formation confirmed by NMR analysis.
Implementation Method 1
reacting phosphorous acid and potassium hydroxide in aqueous solution at a temperature of at least 270°F
Implementation Method 2
cross-pipe reactor with a downstream static in-line mixer, ensuring complete reaction and minimizing oxidation
Implementation Method 3
rapidly cooling the aqueous solution to a temperature below about 90°F
Implementation Method 4
at high temperatures, the chemical bonds in polyphosphate can hydrolyze to yield the starting phosphate ion, (PO4−3) and acid
Implementation Method 5
physical methods such as nuclear magnetic resonance (NMR), high pressure liquid chromatography (HPLC), liquid chromatography, mass spectrometry (MS), and other physical molecular weight determining methods are useful methods for characterizing polyphosphites
Data Source
AI summary
A fungicidal composition having fertilizer properties, the composition containing a high percentage of potassium polyphosphate is disclosed. The composition is useful as a fungicide and as a fertilizer for application to plants and, particularly, commercial crops. A method of making the polyphosphate composition is described, as well as methods of using same.