Desulfonated Estolide Base Oil Preparation via Residue Removal
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Solution Overview
Problem
Conventional lubricant compositions using petroleum-based oils are non-biodegradable and toxic, posing environmental risks and failing to meet biodegradability standards, while existing methods for producing biobased lubricants do not effectively address the removal of sulfonate residues in estolide compounds.
Innovation Solution
A process involving the oligomerization of fatty acid reactants with a sulfonic acid catalyst to form estolides, followed by the removal of sulfonate residues through heat and basic conditions to produce desulfonated estolide base oils, which are biodegradable and meet OECD biodegradability guidelines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If petroleum-based oils are used in lubricant compositions, then lubrication performance is maintained, but biodegradability is poor and environmental toxicity increases
Solution Approach 1:
The invention changes the chemical composition parameters from petroleum-based hydrocarbons to estolide compounds derived from renewable fatty acids, fundamentally altering the molecular structure to achieve both biodegradability and lubrication performance. This parameter change transforms the base oil from non-biodegradable petroleum products to biodegradable estolides with appropriate viscosity and lubricating properties.
Solution Approach 2:
The invention adopts biodegradable estolide base oils that can naturally decompose in the environment, replacing persistent petroleum-based oils. This allows the lubricant to fulfill its function during use and then break down harmlessly, eliminating long-term environmental accumulation and toxicity issues associated with conventional petroleum-based lubricants.
2Productivity
If sulfonic acid catalyst is used in estolide oligomerization, then reaction efficiency is improved, but sulfonate residue removal becomes difficult
Solution Approach 1:
The invention specifically targets and extracts the harmful sulfonate residues from the estolide product through a dedicated removal step. This extraction process separates the catalyst residues from the final base oil, ensuring product purity while maintaining the manufacturing efficiency benefits of using sulfonic acid catalysts during the oligomerization reaction.
Solution Approach 2:
The invention introduces an intermediary purification step between the oligomerization reaction and the final product. This intermediary process, involving treatment with base and filtration, acts as a mediator to remove sulfonate residues without affecting the estolide molecules themselves, thereby resolving the conflict between using efficient catalysts and achieving pure final product.
3Reliability
If biobased estolide compounds are produced, then biodegradability is improved, but sulfonate residue contamination occurs
Solution Approach 1:
The invention converts the potentially harmful sulfonate residues into removable byproducts through treatment with base. The sulfonic acid catalyst, initially a source of contamination, is transformed into water-soluble sulfonate salts that can be easily separated from the estolide base oil through filtration and washing, thereby eliminating the harmful effect while retaining the manufacturing efficiency.
Solution Approach 2:
The invention changes the pH parameter of the system by introducing base treatment to the estolide compound. This parameter change converts the acidic sulfonate residues into neutral or basic forms that are more easily separable, allowing the biodegradable estolide to be produced in a clean state without sulfonate contamination.
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 results in biodegradable estolide base oils that reduce environmental impact and comply with biodegradability standards, offering a sustainable alternative for lubricant compositions.
Implementation Method 1
A process involving the oligomerization of fatty acid reactants with a sulfonic acid catalyst to form estolides
Implementation Method 2
eliminating the at least one sulfonate residue by exposing the at least one first estolide compound to heat and/or basic conditions to provide a desulfonated estolide compound
Data Source
AI summary
Provided herein are processes of preparing sulfonated estolide compounds, and the removal of sulfonate residues from those compounds to provide desulfonated estolide base oils. Exemplary sulfonated estolide compounds include those selected from the formula: wherein z is an integer selected from 0 to 15; q is an integer selected from 0 to 15; x is, independently for each occurrence, an integer selected from 0 to 20; y is, independently for each occurrence, an integer selected 0 to 20; n is equal to or greater than 0; R6 is selected from -OH, optionally substituted alkyl, and optionally substituted aryl; and R2 is selected from hydrogen and optionally substituted alkyl that is saturated or unsaturated, and branched or unbranched, wherein each fatty acid chain residue of said compounds is independently optionally substituted.