Monoammonium Phosphate Fertilizer Solution pH Control
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Solution Overview
Problem
Conventional NP fertilizers face issues such as soil acidification, corrosion of irrigation equipment, damage to microbial colonies, high salt index leading to water migration, and limited safe application due to pH fluctuations and fertilizer burn, resulting in low phosphorus recovery by crops.
Innovation Solution
A method for producing a monoammonium phosphate fertilizer solution by reacting phosphoric acid with ammonium hydroxide, controlling temperature between 20° C. and 45° C., and maintaining a pH of 5.5 to 7.5, which results in a solution with an orthophosphate to polyphosphate ratio greater than 9:1, suitable for safe and effective crop treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional NP fertilizers are applied to provide high concentrations of phosphorus and nitrogen, then plant productivity is improved, but soil acidification occurs and microbial colonies are damaged
Solution Approach 1:
The patent changes the pH parameter of the fertilizer solution from the conventional acidic range to a neutral range (pH 6.0-7.5). This parameter change allows high concentrations of phosphorus and nitrogen to be applied without causing soil acidification or damaging microbial colonies, as the neutral pH is non-acidic and thus does not harm soil biology or alter soil pH adversely.
Solution Approach 2:
The patent converts the typically harmful acidic nature of NP fertilizers into a beneficial neutral pH formulation. By controlling the reaction conditions (temperature 20-45°C, specific reagent ratios) to produce a neutral pH product, the harmful acidic effect is eliminated while maintaining the high nutrient concentration benefit.
2Quantity of substance
If conventional NP fertilizers are dissolved in water for application, then they become available for plant uptake, but they cause corrosion of irrigation equipment due to their corrosive nature
Solution Approach 1:
The patent changes the pH parameter from acidic to neutral (pH 6.0-7.5), which eliminates the corrosive nature of the fertilizer solution. Neutral pH solutions do not corrode metal irrigation equipment, while still maintaining high phosphorus and nitrogen availability for plant uptake when applied at the specified concentrations.
3Quantity of substance
If conventional NP fertilizers are applied at high concentrations, then plant nutrient supply is improved, but fertilizer burn damages the crops
Solution Approach 1:
The patent changes the pH parameter to neutral (pH 6.0-7.5), which fundamentally alters how the fertilizer interacts with plant tissue. At this neutral pH, high concentrations of phosphorus and nitrogen can be applied without causing fertilizer burn, as the neutral formulation is non-caustic and does not damage plant cells even at elevated concentrations.
4Quantity of substance
If conventional NP fertilizers are applied to soil, then phosphorus is supplied to crops, but most phosphorus becomes immobile in soil and is not recovered by crops
Solution Approach 1:
The patent changes the pH parameter to neutral (pH 6.0-7.5), which improves phosphorus mobility and availability in soil. At this pH, phosphorus remains in forms that are more readily taken up by plant roots, increasing the recovery efficiency by crops compared to conventional acidic NP fertilizers that cause phosphorus to become immobile.
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 method produces a stable monoammonium phosphate solution that prevents soil pH disruption, preserves microbial activity, and allows for higher, safe phosphorus application without fertilizer burn, enhancing crop growth and phosphorus availability.
Implementation Method 1
contacting the phosphoric acid with a solution of ammonium hydroxide at the product reaction zone to form a reaction mixture
Implementation Method 2
the temperature of the reaction zone is controlled such that the reagent entry point and product exit point is maintained at between about 20° C. and about 45° C.
Data Source
AI summary
The present invention provides for a method for producing an aqueous monoammonium phosphate containing fertilizer solution. The method provides for means to control the temperature of a reaction zone as measured at a reagent entry point and a product exit point. The pH of the reaction is monitored and the reaction is terminated when the reaction mixture has reached a pH of between about 5.5 and about 7.5. The invention further provides for a method of treating crops with a monoammonium phosphate solution having a pH of between 6 and 7.