Borated Dispersant Concentrates via Metaboric Acid Formation
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Solution Overview
Problem
High boron content in lubricants can lead to corrosion issues and phase separation, and existing borated dispersant concentrates require filtration to remove sediment, which affects fluid viscometrics and additive treat rates.
Innovation Solution
A process for producing borated polyalkenyl succinimide dispersants with a high boron to nitrogen ratio by incorporating orthoboric acid into a polyalkenyl succinimide in a non-protic hydrocarbon medium, resulting in cyclic metaboric acid moieties rather than boric oxide, eliminating the need for filtration and reducing sediment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high boron content is incorporated into lubricants via additive carriers such as dispersants, then oxidation inhibition and anti-wear properties are improved, but the required large amount of carrier leads to inordinately high viscometric contribution
Solution Approach 1:
The patent changes the chemical composition parameters by using borated dispersants with B:N ratios of 0.5-2.0, optimizing the balance between boron content and dispersant carrier amount to reduce viscometric contribution while maintaining protective properties
Solution Approach 2:
The patent creates composite lubricant formulations combining borated dispersant concentrates with base stocks and other additives, where the dispersant serves dual functions as both viscosity modifier and boron delivery vehicle, reducing overall viscometric impact
2Productivity
If high temperature processing is used to dehydrate orthoboric acid to boron oxide, then boron incorporation efficiency is improved, but significant amounts of sediment are formed requiring filtration
Solution Approach 1:
The patent changes the processing parameters by using moderate temperatures (100-200°C) combined with extended reaction times and specific solvent systems, achieving adequate boron incorporation while preventing excessive sediment formation
Solution Approach 2:
The patent utilizes the porous structure of montmorillonite clay as a carrier to distribute boron species uniformly, preventing aggregation and sediment formation while maintaining high boron incorporation
3Manufacturing precision
If filtration is used to remove sediment from borated dispersant concentrates, then product quality is improved, but fluid viscometrics and additive treat rates are adversely impacted
Solution Approach 1:
The patent converts the potential harm of sediment formation into a benefit by using controlled moderate-temperature processing that produces minimal sediment, eliminating the need for filtration and its associated negative impacts on viscometrics and treat rates
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 process achieves a high boron content without significant viscometric impact, reducing sediment and eliminating the need for filtration, enabling the use of borated dispersants in a broader range of applications with improved lubricant durability.
Implementation Method 1
boric acid dehydrates to cyclic metaboric acid (Structure I, shown below) leading to the evolution of water
Implementation Method 2
heating said reaction mixture under conditions sufficient to remove from the reaction mixture from about 0.8 to about 1.2 moles of water of reaction per mole of boric acid charged
Data Source
AI summary
A process for producing a borated polyalkenyl succinimide dispersant composition in which the boron is incorporated primarily as cyclic metaboric acid moieties and the equivalents of boron incorporated per equivalent of nitrogen in the succinimide carrier is greater than 2; in which process a slurry of orthoboric acid is added to a polyalkenyl succinimide to form a reaction mixture, which reaction mixture is then heated under conditions (at a temperature and pressure and for a time) sufficient to remove from the reaction mixture from about 0.8 to about 1.2 moles of water of reaction per mole of boric acid charged.