Fluidized Bed MU-IBDU Granule Formation

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Solution Overview

Problem

Conventional methods for granulating urea condensate products are labor-intensive, require multiple processing steps, and result in granules with low bulk density and crushing strength, limiting their quality and efficiency.

Innovation Solution

A continuous method involving the injection of a methylene urea-isobutylene diurea (MU-IBDU) slurry into a fluid bed granulator with seed particles, where air is used to fluidize the seeds and form granules, eliminating the need for separate drying and solid handling processes, and allowing for improved morphology and crush strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional pan/disc and drum granulation processes are used, then granules can be produced, but the bulk density and crushing strength of the granules are low

Engineering Contradiction:

Improvecrushing strengthVSAvoidmanufacturing process complexity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent replaces conventional mechanical pan/disc and drum granulation systems with a fluidized bed granulation system that uses fluid dynamics (air flow) to suspend and coat particles. This substitution enables better control of granule formation, resulting in higher bulk density and crushing strength without the mechanical complexity of conventional systems

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental operating parameters from mechanical contact-based granulation to fluid-based granulation. By controlling air flow rate, fluidization velocity, and slurry application rate, the process achieves superior granule quality (higher density and strength) while simplifying the manufacturing approach

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional drying and re-moisturization steps are used, then granulation can proceed, but the process becomes labor-intensive and requires additional equipment

Engineering Contradiction:

Improveprocess efficiencyVSAvoidnumber of processing steps

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent merges the granulation and drying operations into a single integrated fluidized bed process. The granules are formed and dried simultaneously in the same reactor vessel, eliminating the need for separate drying and re-moisturization steps, thereby improving productivity and reducing equipment complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements a continuous granulation process where slurry is continuously applied to fluidized particles, and granules are continuously dried and discharged. This continuous operation eliminates batch processing interruptions and manual intervention, significantly improving productivity

Inventive Principle:

Principle #20Continuity of useful action

3Manufacturing precision

If high concentration of synthesized product is used, then drum granulation can be performed, but the process still does not achieve desired quality

Engineering Contradiction:

Improvegranule qualityVSAvoidconcentration of synthesized product

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The patent replaces drum granulation with fluidized bed granulation, which uses fluid dynamics instead of mechanical tumbling. This substitution enables achieving superior granule quality (higher bulk density and crushing strength) without requiring high concentrations of synthesized product

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 MU-IBDU granules with enhanced crush strength and morphology, enabling a more efficient and continuous production process that avoids labor-intensive steps and improves the quality of the granular fertilizer.

Implementation Method 1

injecting air into the fluid bed granulator to fluidize the seed particles in an air stream

Methodology Applied

Scientific EffectFluidization: Fluidisation

Implementation Method 2

spraying the MU-IBDU slurry over the fluidized seed particles to form granules of MU-IBDU

Methodology Applied

Scientific EffectSpray deposition: Fluid Spray

Data Source

PatentUS20240416305A1Continuous Methods for Forming Methylene Urea-Isobutylene Diurea Granules

Publication Date: 2024.12.19 SABIC AGRI NUTRIENTS CO

AI summary

A continuous method for making granules of methylene urea-isobutylene diurea (MU-IBDU) includes: injecting an MU-IBDU slurry including water and MU-IBDU particles into a fluid bed granulator, wherein the fluid bed granulator includes seed particles: injecting air into the fluid bed granulator to fluidize the seed particles in an air stream: spraying the MU-IBDU slurry over the fluidized seed particles to form granules of MU-IBDU; and removing the granules of MU-IBDU from the fluid bed granulator. Fertilizer compositions including the MU-IBDU granules are also described.