Organo-modified Polysiloxanes for Sulfur Melt Granulation Release
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Solution Overview
Problem
Existing release agents for sulfur granulation, such as silicone oils and emulsions, face issues with contamination, residue formation, and stability at higher temperatures, leading to poor separation and shape retention of sulfur granules, resulting in dust generation and dosing inaccuracies.
Innovation Solution
The use of organomodified polysiloxanes with specific polyether radicals, differing in ethylene oxide content, as release agents in the melt granulation process, which adsorb onto sulfur granules, ensuring effective separation and maintaining a spherical shape, and are easily soluble in water for cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone oils or conventional emulsions are used as release agents, then separation of sulfur granules is achieved, but residues remain on steel strips and contamination occurs
Solution Approach 1:
The invention changes the chemical composition parameters of the release agent by using organically modified polysiloxanes with specific polyether radicals containing ethylene oxide units (40-90 mol%). This compositional change enables the release agent to be water-soluble, allowing it to be washed off completely without residues, while maintaining effective separation performance.
Solution Approach 2:
The invention creates a composite release agent system combining polysiloxane backbone with polyether radical side chains. This composite structure provides both the release properties of siloxanes and the water solubility of polyether radicals, eliminating residues while maintaining separation effectiveness.
2Ease of manufacture
If melt granulation is performed without adequate release agents, then process simplicity is maintained, but granule shape retention deteriorates and breakage increases
Solution Approach 1:
The organically modified polysiloxane acts as an intermediary substance between the sulfur melt and the steel conveyor strip. It forms a temporary protective layer during granulation that maintains granule shape, then can be easily removed with water, providing both shape control and process simplicity.
3Reliability
If conventional release agents are used, then initial separation is achieved, but long-term stability deteriorates due to temperature effects
Solution Approach 1:
The invention modifies the thermal stability parameters by selecting polysiloxane molecular weights (50-5000) and polyether radical compositions that maintain structural integrity at granulation temperatures. The specific composition ensures the release agent remains stable during the thermal process while staying water-soluble for easy removal.
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 solution provides long-term separation without residue, maintains uniform spherical granule shape, reduces dust and breakage, and facilitates precise dosing and cleaning of the granulating apparatus.
Implementation Method 1
The organomodified polysiloxanes adsorb on the sulfur granules and thus ensure very good separation of the melt granules
Implementation Method 2
The aqueous solutions used as release agents preferably contain from 0.5 to 50% by weight, preferably from 1 to 25% by weight and very particularly preferably from 3 to 18% by weight of organomodified polysiloxanes
Data Source
AI summary
Use of organomodified polysiloxanes comprising at least three different polyether residues, wherein at least two of these polyether residues differ in their proportion of ethylene oxide units to the total weight of the polyether residue by at least 9 wt%, as a release agent or release agent component in melt granulation.