Overbased Calcium Sulfonate Grease Thickener Yield and Dropping Point
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Solution Overview
Problem
Existing overbased calcium sulfonate grease technologies face challenges in achieving optimal thickener yields and high temperature utility, often requiring excessive overbased calcium sulfonate and volatile alcohols, which are costly and environmentally detrimental, while also struggling with poor quality overbased oil-soluble calcium sulfonates that result in unacceptably low dropping points.
Innovation Solution
The introduction of alkali metal hydroxides, combined with calcium hydroxyapatite and delayed addition of non-aqueous converting agents, in the manufacturing process of overbased calcium sulfonate greases, allowing for reduced overbased calcium sulfonate content while maintaining high dropping points and improved thickener yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excessive overbased calcium sulfonate is used to achieve optimal thickener yields and high temperature utility, then the grease performance is improved, but the cost increases and environmental impact worsens
Solution Approach 1:
The patent introduces alkali metal hydroxide as an intermediary substance that mediates between the overbased calcium sulfonate and the converting agents. The alkali metal hydroxide facilitates the conversion process and enhances thickener yield while allowing reduced amounts of overbased calcium sulfonate to be used, thereby resolving the contradiction between grease performance and substance consumption
Solution Approach 2:
The patent changes the chemical parameters of the grease formulation by adding alkali metal hydroxide and adjusting the ratios of overbased calcium sulfonate, base oil, and converting agents. This parameter change enables achieving optimal thickener yields and high dropping points with reduced overbased calcium sulfonate content, addressing both performance requirements and reduction of substance consumption
2Reliability
If volatile alcohols are used as converting agents to achieve high temperature utility, then the grease performance is improved, but the environmental impact worsens
Solution Approach 1:
The patent replaces expensive and environmentally harmful volatile alcohols with water as the converting agent. Water is a cheaper, non-volatile, environmentally benign substance that achieves the same conversion function without the harmful environmental effects associated with volatile alcohol-based converting agents
Solution Approach 2:
The patent converts the previously harmful volatile alcohol converting agents into a beneficial water-based system. By using water as the converting agent, the process eliminates volatile emissions and environmental harm while maintaining the necessary chemical conversion function for high temperature grease performance
3Ease of manufacture
If poor quality overbased oil-soluble calcium sulfonate is used to reduce costs, then the manufacturing cost is reduced, but the dropping point becomes unacceptably low
Solution Approach 1:
The patent introduces alkali metal hydroxide as an intermediary that compensates for the inferior quality of the overbased calcium sulfonate. The alkali metal hydroxide enhances the conversion process and thickener formation, allowing poor quality overbased calcium sulfonate to produce greases with acceptable dropping points and high temperature performance
Solution Approach 2:
The patent creates a composite grease system combining overbased calcium sulfonate, base oil, alkali metal hydroxide, and water-based converting agents. This composite formulation synergistically improves the performance of poor quality overbased calcium sulfonate, achieving acceptable dropping points and thickener yields while maintaining lower manufacturing costs
4Reliability
If pressure reactors are used to achieve high dropping points, then the high temperature performance is improved, but the device complexity increases
Solution Approach 1:
The patent replaces the complex mechanical pressure reactor system with a simpler chemical solution approach. By using alkali metal hydroxide and water-based converting agents, the high temperature performance is achieved through chemical enhancement rather than mechanical pressure application, eliminating the need for complex pressure reactor equipment
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 enables the production of greases with superior thickener yields and high temperature performance, even with poor quality overbased calcium sulfonates, reducing costs and environmental impact by minimizing the use of volatile alcohols and achieving dropping points above 575°F without the need for pressure reactors.
Implementation Method 1
react 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
Implementation Method 2
convert the amorphous calcium carbonate contained in the overbased calcium sulfonate to a very finely divided dispersion of crystalline calcium carbonate (calcite)
Implementation Method 3
heating some combination of these ingredients until conversion has occurred
Data Source
AI summary
An overbased calcium sulfonate grease composition and method of manufacture comprising added alkali metal hydroxide alone or in combination with (a) calcium hydroxyapatite and/or added calcium carbonate used as calcium containing bases for reacting with complexing acids) and/or (b) at least one delay period between the addition of water as a converting agent and addition of a portion of a non-aqueous converting agent. A delay period may involve the period of time it takes to adjust the temperature of the mixture, a period of time during which the mixture is held at a temperature or within a range of temperatures, and multiples and any combination thereof. These calcium sulfonate greases have improved thickener yield and high dropping points compared to greases made without added alkali metal hydroxide and delay between the additions of water and a non-aqueous converting agent, particularly when a poor quality overbased calcium sulfonate is used.