Alkyl Dialkoxyalkanoate Biodiesel Cold Flow
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Solution Overview
Problem
Current biodiesels exhibit poor cold-weather performance due to gelation and clogging issues in fuel filters, limiting their use in cold environments, and existing conversion processes may involve undesirable halogenated reactants and heavy metals, making them inefficient and environmentally unsound.
Innovation Solution
The synthesis of alkyl dialkoxyalkanoate biodiesels through a one-pot triple condensation of primary aliphatic alcohols with pyruvic acid and glyoxylic acid, followed by a base-catalyzed step to enhance ester group interchanging, using environmentally friendly methods and flow chemistry, resulting in fuels suitable for mixing-controlled compression ignition engines with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional biodiesel is used to reduce carbon emissions and dependence on fossil fuels, then environmental benefits are achieved, but cold-weather performance deteriorates due to gelation and clogging in fuel filters
Solution Approach 1:
The patent changes the chemical parameters of biodiesel by synthesizing dialkoxyalkanoates with specific molecular structures (formula I) that have lower cloud points and pour points. The ester and ketal/acetal functional groups are strategically positioned to reduce intermolecular interactions that cause gelation, thereby improving cold-weather performance while maintaining combustion properties
Solution Approach 2:
The invention creates a composite molecular structure combining ester and ketal/acetal functional groups within the same biodiesel molecule. This composite structure leverages the renewable nature of ester groups while the ketal/acetal groups provide structural stability at low temperatures, preventing filter clogging and gelation
2Productivity
If existing conversion processes are used to produce biodiesel, then fuel production is achieved, but environmental soundness deteriorates due to use of halogenated reactants and heavy metals
Solution Approach 1:
The patent extracts and eliminates harmful halogenated reactants and heavy metal catalysts from the biodiesel production process. The method uses only carbon, hydrogen, and oxygen-containing compounds throughout synthesis, removing toxic substances while maintaining high productivity through efficient one-pot condensation reactions
Solution Approach 2:
The invention converts potentially harmful intermediate compounds into beneficial fuel components. The alpha-carbonyl acids and alcohols that could form unwanted byproducts are instead directed toward forming dialkoxyalkanoates with desirable fuel properties, turning potential waste streams into valuable fuel constituents
3Quantity of substance
If standard biodiesel synthesis is used to meet renewable fuel mandates, then production volume is achieved, but fuel properties deteriorate with poor cold flow and limited blend volume application
Solution Approach 1:
The patent applies local quality by creating biodiesel molecules with specific regional functional group distributions. The dialkoxyalkanoate structure places ester groups at specific positions while incorporating ketal/acetal groups at other locations, giving different parts of the molecule different properties that collectively improve both cold flow and combustion characteristics
Solution Approach 2:
The invention introduces dynamic adaptability in fuel properties by varying the R1, R2, R2′, and R3 groups in the dialkoxyalkanoate structure. This allows tailoring of cloud point, cetane number, and energy content to match specific application requirements and environmental conditions, enabling precise control over fuel specifications
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 resulting biodiesels demonstrate enhanced cetane numbers, low cloud points, high energy content, and improved cold-weather performance, potentially allowing broader use of renewable diesel fuels and incorporating low-quality biomass hydrolysates, while being produced through environmentally friendly and scalable processes.
Implementation Method 1
one-pot, triple condensation of primary aliphatic alcohols with pyruvic acid and glyoxylic acid
Implementation Method 2
base catalyzed step allowed for chemoselective interchanging of the ester group
Data Source
AI summary
A fuel for an internal combustion engine includes a C5 to C30 dialkoxyalkanoate corresponding to formula (I):wherein the R1 group is —H or a —CH3 group, the R2 and R2′ groups are alkyl groups independently selected to have 1 to 9 carbon atoms; and the R3 group is selected to have 1 to 9 carbon atoms. The compounds described herein may be used as neat fuels or mixed fuels (with diesel, biodiesel, jet fuel, marine fuel or other fuel compounds) in autoignition or spark ignition engines, such as diesel engines, gasoline (spark ignition) engines, MCCI, Homogeneous Charge Compression Ignition (HCCI) engines, or more generally in Low-Temperature Gasoline Combustion (LTGC) engines (using gasoline-like fuels), that have the high-efficiency advantages of HCCI but can operate with some level of charge inhomogeneities. Methods of making these compounds are environmentally friendly and can be done in a continuous manner.