Overbased Calcium Sulfonate Grease Manufacturing with Acid Delay
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Solution Overview
Problem
Existing methods for producing overbased calcium sulfonate greases require high amounts of expensive overbased calcium sulfonate and do not efficiently achieve both improved thickener yield and high dropping point without using pressure reactors or volatile alcohols, which are environmentally detrimental.
Innovation Solution
Implementing a method that includes a facilitating acid delay period during the production of overbased calcium sulfonate greases, combined with the use of calcium hydroxyapatite, crystalline calcium carbonate, alkali metal hydroxide, and delayed addition of non-aqueous converting agents or overbased magnesium sulfonate, to reduce the amount of overbased calcium sulfonate required while maintaining high temperature utility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amounts of overbased calcium sulfonate are used in existing production methods, then the dropping point and thickener yield are maintained, but the production cost increases and environmental sustainability deteriorates due to use of pressure reactors and volatile alcohols
Solution Approach 1:
The facilitating acid is added before the converting agents (water and non-aqueous converting agents) to pre-condition the overbased calcium sulfonate system. This preliminary action allows the acid to interact with the amorphous calcium carbonate and sulfonate structure ahead of conversion, improving reaction efficiency and reducing the total amount of overbased calcium sulfonate needed to achieve the desired dropping point and grease structure.
Solution Approach 2:
The production process uses a multi-stage addition sequence with specific time intervals: first adding the facilitating acid and holding for 20-120 minutes, then adding converting agents, followed by additional holding periods. This periodic action allows controlled chemical transformations at each stage, enabling reduced thickener content while maintaining product performance through optimized reaction kinetics.
2Manufacturing precision
If pressure reactors are used to achieve improved thickener yield and high dropping point, then the grease performance is enhanced, but the equipment complexity and manufacturing cost increase
Solution Approach 1:
The facilitating acid acts as a chemical intermediary that mediates between the overbased calcium sulfonate and the converting agents. By introducing this intermediary substance, the reaction pathway is modified to proceed more efficiently at atmospheric pressure, achieving the same thickener yield and dropping point improvements that traditionally required pressure reactor equipment.
Solution Approach 2:
The facilitating acid (acetic acid or formic acid) is a inexpensive, readily available chemical that replaces the need for expensive pressure reactor equipment. The acid is consumed in the reaction process, providing a low-cost chemical solution that eliminates the need for costly capital equipment while achieving the desired manufacturing precision.
3Ease of manufacture
If volatile alcohols are used as converting agents, then the conversion of amorphous calcium carbonate is achieved, but environmental sustainability and safety deteriorate
Solution Approach 1:
The patent converts the traditional use of harmful volatile alcohols into a beneficial process by using facilitating acids (acetic acid or formic acid) instead. These acids serve the dual purpose of facilitating the conversion reaction and providing environmental benefits. The harmful volatile organic compounds are replaced with less hazardous substances that still achieve efficient conversion of amorphous calcium carbonate to crystalline form.
Solution Approach 2:
The chemical parameters of the converting agents are changed from volatile alcohols to facilitating acids with different physical and chemical properties. This parameter change maintains the conversion efficiency needed for manufacturing while eliminating the environmental and safety hazards associated with volatile alcohols, as the acids have higher boiling points and lower volatility.
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 approach allows for improved thickener yield and high dropping points in overbased calcium sulfonate greases with reduced overbased calcium sulfonate content, eliminating the need for pressure reactors and volatile alcohols, thus enhancing manufacturing efficiency and environmental sustainability.
Implementation Method 1
reacting a stoichiometric excess amount of calcium oxide (CaO) or calcium hydroxide (Ca(OH)2) as the base source with an alkyl benzene sulfonic acid, carbon dioxide (CO2), and with other components to produce an oil-soluble overbased calcium sulfonate with amorphous calcium carbonate dispersed therein
Implementation Method 2
converting the pre-conversion mixture to a converted mixture by heating until conversion of the amorphous calcium carbonate to crystalline calcium carbonate has occurred
Data Source
AI summary
A method of making an overbased calcium sulfonate or calcium magnesium sulfonate grease using one or more delay periods between the addition of at least a portion of a facilitating acid, such as DDBSA, and at least a portion of the next subsequently added ingredient. The delay period may be a temperature adjustment delay or a holding delay period. An overbased calcium sulfonate or calcium magnesium sulfonate grease composition comprises 0.5%-5% of a facilitating acid, allows for a reduced amount of overbased calcium sulfonate below 22%, and allows for a reduced amount of calcium hydroxyapatite to provide 10-25% of hydroxide equivalent basicity of the total hydroxide equivalent basicity due to calcium hydroxyapatite and added calcium hydroxide, while maintaining a high dropping point.