Delayed Non-Aqueous Converting Agent Addition in Calcium Sulfonate Grease
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Solution Overview
Problem
Existing methods for manufacturing overbased calcium sulfonate greases 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 greases and inefficient processing.
Innovation Solution
A method involving delayed addition of non-aqueous converting agents during the manufacturing process of overbased calcium sulfonate greases, allowing for improved thickener yield and high temperature performance by optimizing the reaction conditions and using calcium hydroxyapatite as a calcium-containing base, thereby reducing the amount of overbased calcium sulfonate required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods use excessive overbased calcium sulfonate and volatile alcohols to manufacture greases, then the grease consistency and high temperature utility are achieved, but the cost increases and environmental impact worsens
Solution Approach 1:
The patent changes the chemical parameters of the converting agent by replacing volatile alcohols with non-aqueous converting agents that do not contain oxygen-hydrogen bonds. This substitution maintains the grease's high temperature utility while eliminating harmful volatile organic compounds, thereby resolving the contradiction between reliability and environmental impact
Solution Approach 2:
The patent replaces expensive overbased calcium sulfonate with calcium hydroxyapatite, a more cost-effective calcium-containing base. This substitution reduces manufacturing cost while maintaining grease performance, addressing the contradiction between cost and product quality
2Manufacturing precision
If conventional methods use excessive overbased calcium sulfonate to achieve optimal thickener yields, then the grease consistency is improved, but the manufacturing cost increases
Solution Approach 1:
The patent changes the chemical composition parameters by introducing non-aqueous converting agents and calcium hydroxyapatite. This parameter change allows achieving optimal thickener yields with reduced amounts of overbased calcium sulfonate, thereby resolving the contradiction between manufacturing precision and quantity of substance
Solution Approach 2:
The patent uses a composite system combining calcium hydroxyapatite with non-aqueous converting agents. This composite approach creates synergistic effects that improve thickener yield efficiency, allowing reduced usage of expensive overbased calcium sulfonate while maintaining or improving grease quality
3Productivity
If conventional methods use volatile alcohols as converting agents, then the conversion process is effective, but the environmental harm and cost increase
Solution Approach 1:
The patent changes the chemical parameters of the converting agent by eliminating oxygen-hydrogen bonds from the molecular structure. The non-aqueous converting agents used have different chemical compositions that maintain conversion efficiency while eliminating volatile organic compounds, thereby resolving the contradiction between productivity and environmental harm
Solution Approach 2:
The patent converts the potential harm of using conventional converting agents into benefit by selecting non-aqueous agents that eliminate environmental pollution. The conversion process remains effective while producing no harmful emissions, turning a potentially harmful process into an environmentally friendly one
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 method achieves superior thickener yields and high temperature utility, with greases exhibiting NLGI No. 2 grade consistency and dropping points above 575°F, while reducing the cost and environmental impact by minimizing the use of expensive overbased calcium sulfonate and eliminating volatile alcohols.
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 (C02), and with other components to produce an oil-soluble overbased calcium sulfonate with amorphous calcium carbonate dispersed therein
Implementation Method 2
The crystalline form of the calcium carbonate is preferably calcite. This extremely finely divided calcium carbonate, also known as a colloidal dispersion, interacts with the calcium sulfonate to form a grease-like consistency
Data Source
AI summary
A method of manufacturing an overbased calcium sulfonate grease comprising a reduced amount of overbased calcium sulfonate, water and at least one non-aqueous converting agent, where at least a portion of the non-aqueous converting agent is added after one or more delay periods relative to the addition of the water. 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 of substantially similar composition made without a delay between the additions of water and a non-aqueous converting agent, particularly when a poor quality overbased calcium sulfonate is used.