Overbased Magnesium Oxide Dispersion Process
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing overbased magnesium oxide dispersions with high magnesium content face challenges such as unacceptably high viscosities and gelling, and require high temperatures or reduced pressure for concentration, limiting the use of high boiling solvents and carrier systems.
Innovation Solution
A process involving heating a mixture of magnesium oxide, sulfonic or carboxylic acid dispersants, and water under pressure in a solvent with a boiling point below 280°C, allowing for the production of stable, free-flowing dispersions with up to 50% magnesium content, without the need for additional solubilizing agents or promoters, and enabling easy solvent distillation for concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high boiling solvents (boiling point >280°C) are used as carriers for MgO dispersions, then the dispersions can be produced through thermal decomposition at high temperatures (300-350°C), but the resulting products have unacceptably high viscosities and gelling
Solution Approach 1:
The patent changes the boiling point parameter of the solvent carrier from high (>280°C) to low (<280°C). This parameter change allows the dispersion to be processed at high temperatures without using high boiling solvents, thereby avoiding the viscosity and gelling problems that occur with traditional high boiling carrier systems.
Solution Approach 2:
Instead of using high boiling solvents to withstand high processing temperatures, the patent inverts the approach by using low boiling solvents and applying pressure to contain the system during heating. This inverted methodology achieves the same high temperature processing capability without the harmful viscosity effects.
2Shape
If high temperatures (300-350°C) are used for thermal decomposition to produce fine particle size MgO dispersions, then good flowability is achieved, but high boiling point solvents are required as carriers
Solution Approach 1:
The patent changes the boiling point parameter of the solvent from high (>280°C) to low (<280°C). This allows the system to achieve fine particle sizes through high temperature decomposition while using low boiling solvents, eliminating the need for high boiling point carrier systems.
Solution Approach 2:
The patent applies pressure containment before and during the thermal decomposition process to prevent solvent loss and maintain system integrity at high temperatures. This prior cushioning through pressure control enables the use of low boiling solvents at high temperatures without requiring high boiling point carriers.
3Quantity of substance
If conventional methods are used to concentrate MgO dispersions, then high magnesium content can be achieved, but additional solubilizing agents or promoters are required
Solution Approach 1:
The patent extracts and eliminates the need for additional solubilizing agents or promoters from the conventional concentration process. By using low boiling solvents that can be easily removed through distillation, the system achieves high magnesium content dispersions without requiring complex additional chemical agents.
Solution Approach 2:
The patent replaces chemical methods (using solubilizing agents and promoters) with a physical method (pressure-controlled thermal decomposition followed by solvent distillation). This substitution simplifies the process by eliminating the need for additional chemical additives while achieving the same concentration effect.
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 stable, free-flowing magnesium oxide dispersions with submicron particle sizes and high magnesium content, reducing viscosity issues and allowing for flexible processing, making them suitable as additives in fuels and lubricating oils.
Implementation Method 1
heating under pressure a mixture of magnesium oxide, sulfonic or carboxylic acid dispersant such as an alkylbenzene sulfonic acid, C1-5 carboxylic acid and water to 280-360 ° C. in a solvent with a boiling point of less than 280° C.
Implementation Method 2
heating under pressure a mixture of magnesium oxide, sulfonic or carboxylic acid dispersant such as an alkylbenzene sulfonic acid, C1-5 carboxylic acid and water to 280-360 ° C. in a solvent with a boiling point of less than 280° C.
Data Source
AI summary
Overbased MgO dispersions with high magnesium content and acceptably low viscosities are prepared without gel formation by heating to 280-360° C. under high pressure in a sealed reactor a mixture of MgO, selected dispersants, low MW carboxylic acids, water and a hydrocarbon solvent having a boiling point below 280° C. No additional solubilizing or dispersing agents, promoters or reactants such as carbon dioxide, amines, alcohols etc are needed to obtain the desired dispersions. Compositions such as lubricating oils and fuels containing the overbased magnesium dispersions as additives are also disclosed.