Fischer-Tropsch Base Oil Lubricant Thermal Stability

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Solution Overview

Problem

Conventional lubricating oil compositions for automotive engines contain high levels of sulfated ash, phosphorus, and sulfur, which can poison catalytic converters and particulate traps, reducing their service life and environmental impact, while also compromising thermal stability due to lower levels of phosphate and phosphorus-containing additives.

Innovation Solution

A lubricating oil composition with a major amount of Fischer-Tropsch Base Oil (FTBO) and reduced levels of sulfated ash, phosphorus, and sulfur, incorporating ashless dispersants, metal-containing detergents, and anti-wear additives to maintain thermal stability and minimize environmental impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional base oils and phosphorus-containing additives are used, then thermal stability is improved, but sulfated ash, phosphorus, and sulfur levels increase causing catalyst poisoning

Engineering Contradiction:

Improvethermal stabilityVSAvoidsulfated ash, phosphorus, and sulfur emissions

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by using Fischer-Tropsch base oil instead of conventional base oils, and by carefully controlling the levels of phosphorus-containing additives to maintain thermal stability while reducing sulfated ash, phosphorus, and sulfur emissions below regulatory thresholds

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite lubricant formulation combining Fischer-Tropsch base oil with specific additive packages including phosphorus-containing antioxidants and metal-containing detergents, where the synergistic interaction between components provides thermal stability while maintaining low SAPS levels

Inventive Principle:

Principle #40Composite materials

2Object-generated harmful factors

If phosphorus-containing additives are reduced to protect catalysts, then environmental impact is improved, but thermal stability deteriorates

Engineering Contradiction:

Improvephosphorus emissions to catalystsVSAvoidthermal stability

Core Design Contradiction:

Object-generated harmful factorsVSReliability

Solution Approach 1:

The patent optimizes the phosphorus content parameter to a specific range that provides sufficient antioxidant protection for thermal stability while keeping phosphorus emissions below catalyst damage thresholds, and compensates by using Fischer-Tropsch base oil which provides inherent oxidation resistance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces Fischer-Tropsch base oil as an intermediary substance that provides inherent oxidation resistance, reducing the dependency on phosphorus-containing additives while maintaining thermal stability

Inventive Principle:

Principle #24Intermediary (Mediator)

3Duration of action of stationary object

If sulfur-containing additives are reduced to protect catalytic converters, then catalyst service life is extended, but lubricant performance deteriorates

Engineering Contradiction:

Improvecatalytic converter service lifeVSAvoidlubricant performance

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent controls sulfur content parameters to protect catalytic converters while maintaining adequate lubricant performance through the combination of Fischer-Tropsch base oil properties and optimized additive packaging

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8747650B2Engine lubricant with enhanced thermal stability

Publication Date: 2014.06.10 CHEVRON ORONITE TECH BV

AI summary

Provided are formulations, methods of making, and methods of using one or more Fischer-Tropsch Base Oils of the present invention in a low sulfur, low sulfated ash, and low phosphorus engine lubricant to enhance thermal stability of the lubricant as well as the high-temperature performance of an engine housing the lubricant.