Calcium Lanthanum Heterogeneous Catalyst for Biodiesel Transesterification
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Solution Overview
Problem
Existing biodiesel production methods using homogeneous base catalysts face challenges such as corrosiveness, difficult catalyst removal, and high waste generation, especially when processing crude oils with high water and free fatty acid contents, which are less expensive but require elevated temperatures and pressures.
Innovation Solution
Development of a novel heterogeneous catalyst comprising calcium hydroxide and lanthanum hydroxide with a specific surface area greater than 10 m2/g, prepared through a multistep precipitation process using ammonia, ethanol, and carbon dioxide, allowing for efficient transesterification of crude oils and waste cooking oils at moderate conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If homogeneous base catalysts (sodium hydroxide or potassium hydroxide) are used for transesterification, then high activity and mild reaction conditions are achieved, but corrosiveness and difficult catalyst removal occur
Solution Approach 1:
The patent replaces homogeneous base catalysts (sodium hydroxide or potassium hydroxide) with a heterogeneous catalyst system consisting of calcium oxide particles supported on porous polymer beads. This substitution eliminates the corrosiveness issue while maintaining catalytic activity through the solid-supported base sites that facilitate transesterification without dissolving or requiring complex removal procedures.
Solution Approach 2:
The invention creates a composite catalyst material combining calcium oxide (providing basic catalytic sites) with porous polymer beads (providing structural support and surface area). This composite structure integrates the high activity of base catalysts with the advantages of solid-supported materials, achieving both high productivity and reduced harmful effects.
2Productivity
If homogeneous base catalysts are used for transesterification, then high activity is achieved, but large amount of waste washing water is generated and long time is required for phase separation
Solution Approach 1:
The patent replaces soluble homogeneous base catalysts with an insoluble heterogeneous catalyst system (calcium oxide on porous polymer beads). This eliminates the need for extensive washing procedures to remove catalyst residues, significantly reducing waste washing water generation while maintaining high catalytic activity for transesterification.
3Ease of manufacture
If crude oils with high water and free fatty acid contents are used for biodiesel production, then production costs are reduced, but elevated temperatures and pressures are required
Solution Approach 1:
The patent modifies the catalyst system parameters by using calcium oxide supported on porous polymer beads, which changes the operational conditions required for transesterification. This catalyst system enables the reaction to proceed at lower temperatures and pressures compared to conventional methods, allowing the use of crude oils with high water and free fatty acid contents without requiring excessive energy input.
4Object-affected harmful factors
If solid base catalysts are used to alleviate corrosiveness and removal difficulties, then high activity is maintained, but catalyst preparation complexity increases
Solution Approach 1:
The patent employs porous polymer beads as the support structure for calcium oxide particles. This porous material provides high surface area and porosity that facilitate catalyst preparation and performance. The porous structure allows for easy impregnation and distribution of calcium oxide, simplifying the preparation process while maintaining high catalytic activity and reducing corrosiveness.
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 new catalysts exhibit high activity and ease of separation, reducing production costs and environmental impact by enabling the use of unrefined oils, achieving high yields of fatty acid methyl esters while minimizing corrosiveness and waste.
Implementation Method 1
contacting a feed material that comprises a glyceride with an alcohol in the presence of the catalyst as disclosed in the present disclosure such that at least some of the glyceride in the feed material is converted into the corresponding alcoholic ester of the glyceride
Implementation Method 2
introducing a base precipitant, a neutral precipitant, and an acid precipitant to a solution comprising a first metal ion and a second metal ion to form a precipitate
Implementation Method 3
calcining the precipitate to provide the catalyst
Data Source
AI summary
In one aspect, a heterogeneous catalyst comprises calcium hydroxide and lanthanum hydroxide, wherein the catalyst has a specific surface area of more than about 10 m2/g. In another aspect, a heterogeneous catalyst comprises a calcium compound and a lanthanum compound, wherein the catalyst has a specific surface area of more than about 10 m2/g, and a total basicity of about 13.6 mmol/g. In further another aspect, a heterogeneous catalyst comprises calcium oxide and lanthanum oxide, wherein the catalyst has a specific surface area of more than about 10 m2/g. In still another aspect, a process for preparing a catalyst comprises introducing a base precipitant, a neutral precipitant, and an acid precipitant to a solution comprising a first metal ion and a second metal ion to form a precipitate. The process further comprises calcining the precipitate to provide the catalyst.