Urea Particle Polymer Encapsulation for Dust-Free Strength
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Solution Overview
Problem
Existing methods for producing urea-containing particles require cooling to below 55°C to achieve mechanical strength and prevent dust formation, leading to large and costly equipment or the use of low-temperature cooling mediums, which are inefficient and costly.
Innovation Solution
Encapsulating urea droplets in a polymer with a first and second polymer layer, cooling the droplets between 60°C and 120°C to form strong, non-dusting particles, using a polymer-encapsulation technique that was originally developed for a different purpose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If urea droplets are cooled to below 55°C to achieve mechanical strength and prevent dust formation, then the particles gain sufficient mechanical strength and dust formation is prevented, but the equipment size becomes very large and costly due to required residence time and cooling costs increase with low-temperature cooling mediums
Solution Approach 1:
The patent changes the temperature parameter from conventional below-55°C cooling to a higher range of 60°C-120°C. This parameter change is enabled by the polymer encapsulation technique, which allows the urea droplets to maintain mechanical strength at higher temperatures. The polymer matrix provides structural support that compensates for the reduced cooling, eliminating the need for large cooling equipment and low-temperature cooling mediums while still achieving dust-free, strong particles
Solution Approach 2:
The patent creates a composite material system where urea droplets are encapsulated within a polymer matrix. This composite structure combines the fertilizer properties of urea with the mechanical strength and thermal stability of the polymer. The polymer encapsulation provides the necessary structural integrity at higher temperatures, allowing the urea to be handled without dust formation while eliminating the need for extensive cooling infrastructure
2Strength
If cooling medium temperature is reduced to very low temperatures (e.g., liquid nitrogen) to cool urea droplets, then the particles achieve mechanical strength, but operating cost increases significantly
Solution Approach 1:
The patent fundamentally changes the temperature parameter from very low temperatures (liquid nitrogen range) to a moderate range of 60°C-120°C. The polymer encapsulation technique enables this parameter change by providing thermal stability and mechanical support at higher temperatures. This eliminates the need for expensive low-temperature cooling mediums while achieving the same mechanical strength and dust prevention goals, significantly reducing operating costs
3Temperature
If droplet size is reduced to meet cooling requirements, then cooling efficiency improves, but productivity decreases due to smaller particle output
Solution Approach 1:
The patent changes the operational temperature parameter to 60°C-120°C, which allows the use of larger droplet sizes while maintaining effective heat transfer and achieving proper cooling. The polymer encapsulation provides structural support that prevents dust formation even with larger particles, allowing increased droplet size without sacrificing cooling efficiency or particle quality. This directly increases productivity by enabling larger particle output
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 produces urea-containing particles with mechanical integrity and prevents dust formation, allowing for larger droplet sizes without the need for extreme cooling, thereby reducing equipment costs and improving operational efficiency.
Implementation Method 1
applying a second polymer layer onto the first polymer layer comprising the droplets so as to form encapsulated urea droplets
Implementation Method 2
cooling the droplets provided on the first polymer layer to a temperature between 60°C and 120°C
Data Source
AI summary
The invention pertains to a method of making urea-containing particles wherein with a lower degree of cooling, high mechanical strengths are obtained. The method comprises the steps of (a) providing a first polymer 10 layer; (b) feeding urea droplets onto said first polymer layer, (c) cooling the droplets provided on the first polymer layer to a temperature between 55º C and 120º C; (d) applying a second polymer layer onto the first polymer layer comprising the droplets so as to form encapsulated urea droplets; and (e) separating the encapsulated urea droplets.