Solid Lubricant Pretreatment for Denser Reactor Particle Filling
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Solution Overview
Problem
Existing methods for filling reactors with solid particles, such as manual 'Sock' loading and high-density techniques like Catapac™, do not achieve optimal densities due to inter-particle adhesion forces, leading to inefficient reactor performance and process limitations.
Innovation Solution
A pretreatment process involving mixing solid particles with a solid lubricant, such as magnesium stearate, at room temperature before loading, reduces inter-particle adhesion forces, allowing for improved reactor filling densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If solid particles are loaded directly into the reactor without pretreatment, then the loading process is simple, but the filling density is insufficient due to inter-particle adhesion forces
Solution Approach 1:
The patent applies preliminary action by mixing solid particles with a lubricant before loading them into the reactor. This pretreatment step reduces inter-particle adhesion forces in advance, allowing the particles to flow more freely and achieve higher filling density during the subsequent loading process, thereby resolving the contradiction between simple loading and high density filling.
Solution Approach 2:
The patent introduces a lubricant as an intermediary substance between solid particles. The lubricant coats the particle surfaces, reducing friction and adhesion forces between particles. This intermediary layer enables particles to slide past each other more easily during loading, significantly improving filling density without complicating the loading mechanism itself.
2Ease of operation
If a lubricant is added to reduce inter-particle adhesion, then flowability improves, but excessive lubricant creates aggregates and increases friction
Solution Approach 1:
The patent applies parameter changes by carefully controlling the lubricant concentration within an optimal range (0.1-5 wt%). By adjusting this critical parameter, the patent achieves sufficient lubrication to improve flowability while preventing aggregate formation. The optimized concentration ensures the lubricant film is thin enough to avoid bridging between particles yet sufficient to reduce adhesion forces effectively.
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 pretreatment process enhances reactor filling densities by up to 4%, reduces re-settling effects, improves hydrodynamics, and maintains adsorbent performance, increasing process productivity.
Implementation Method 1
The increased flowability of the powders is made possible by the lubricant, which spreads across the surface of the granules. Due to the presence of a lubricant film formed on the surface, the distance between the granules increases, initially reducing the inter-particle adhesion forces.
Data Source
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AI summary
The invention relates to a pretreatment process for improving the filling of a chamber with solid particles, wherein said solid particles are mixed, before said solid particles are loaded into the chamber, with at least one lubricant that is solid at room temperature, chosen from saturated fatty acids having 14 or more carbon atoms, metal salts of saturated fatty acids having 14 or more carbon atoms, esters of fatty acids having 14 or more carbon atoms, fatty alcohols having 14 or more carbon atoms, linear N-alkanes having 16 or more carbon atoms in solid form, fumaric acid, talc, sodium stearoyl fumarate, the lubricant being introduced at a content of between 0.01 and 1% relative to the total weight of the mixture of solid particles and lubricant. The invention also relates to the use of the process for the pretreatment of particles of adsorbents for the separation of xylenes.