Urea-Formaldehyde Polymer Particles for Nitrogen Retention
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Solution Overview
Problem
Current urea-based fertilizers face significant nitrogen loss due to volatilization of ammonia and carbon dioxide, and nitrification inhibitors like dicyandiamide have poor solubility, necessitating the development of new compositions and methods to improve their properties.
Innovation Solution
A formulation combining nitrification inhibitors such as nitrapyrin or DMPP with urea-formaldehyde polymer particles, which are coated with urease inhibitors like N-(n-butyl)thiophosphoric triamide, to create a slow-release fertilizer that reduces nitrogen loss by controlling the hydrolysis process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If nitrification inhibitors like dicyandiamide are used to reduce nitrogen loss, then nitrogen retention is improved, but solubility in solvents deteriorates
Solution Approach 1:
The patent uses UFP particles as an intermediary carrier to deliver the nitrification inhibitor. The inhibitor is adsorbed onto the UFP particle surface, allowing it to be applied effectively without requiring high solubility in conventional solvents. The UFP acts as a mediator between the poorly soluble inhibitor and the fertilizer application system.
Solution Approach 2:
The patent changes the physical state and delivery mechanism of the nitrification inhibitor by adsorbing it onto UFP particles. This transforms the inhibitor from a solvent-dependent chemical into a particle-based delivery system, fundamentally changing how the substance is applied and released in the environment.
2Quantity of substance
If urea is applied to soil to provide nitrogen, then plant nutrition is improved, but ammonia volatilization increases
Solution Approach 1:
The patent applies nitrification inhibitors to the UFP particles before or concurrent with urea application. This preliminary action prevents the conversion of ammonium to nitrate, which in turn prevents subsequent nitrogen loss through volatilization, addressing the harmful effect before it occurs.
Solution Approach 2:
The UFP particles coated with nitrification inhibitor serve as an intermediary that modifies the chemical environment around the urea. This intermediary layer prevents the harmful volatilization reaction while still allowing the beneficial nitrogen release to plants.
3Loss of energy
If nitrification inhibitors are applied at high rates to ensure effectiveness, then nitrogen retention is improved, but application cost increases
Solution Approach 1:
The nitrification inhibitor is pre-loaded onto the UFP particles during manufacturing, creating a ready-to-use formulation. This preliminary preparation ensures that the inhibitor is immediately available at the correct concentration when applied, eliminating the need for excessive application rates to guarantee effectiveness.
Solution Approach 2:
The patent creates a composite material consisting of UFP particles coated with nitrification inhibitor. This composite structure ensures controlled release and consistent distribution of the inhibitor, improving efficiency and reducing the total quantity needed compared to bulk application methods.
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 formulation significantly lowers the use rates of nitrification inhibitors, enhances nitrogen uptake by plants, and minimizes nitrogen loss from the soil, thereby improving crop yields and fertilizer efficiency.
Implementation Method 1
the hydrolysis process can be considerably decelerated by applying enzyme inhibitors, specifically urease or nitrification inhibitors with urea
Implementation Method 2
nitrification inhibitors include, but are not limited to, dicyandiamide (DCD), nitrapyrin and 3,4-dimethylpyrazole phosphate (DMPP)
Data Source
AI summary
An improved nitrification inhibitor composition comprising UFP particles and a nitrification inhibitor, and optionally other components, is used as an additive for liquid and solid fertilizers, typically containing urea. The nitrification inhibitor particularly can be nitrapyrin and/or DMPP. Methods of making the compositions and their use are also disclosed.