Solid Acid Catalyst Process for Fatty Acid Alkyl Ester Production
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Solution Overview
Problem
Existing methods for producing fatty acid alkyl esters and glycerin face issues such as the formation of methoxypropanediol as a side product, which deteriorates glycerin quality, and require complex catalyst neutralization and purification processes.
Innovation Solution
A process involving the reaction of fats and oils with C1 to C5 lower alcohols, followed by removal of excess alcohol, separation into oil and aqueous phases, and subsequent reaction with a solid acid catalyst to inhibit side product formation and enhance yield, using a pseudo-countercurrent operation in fixed bed reactors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a homogeneous catalyst is used for ester exchange reaction, then the reaction can proceed efficiently, but catalyst neutralization and glycerin purification become complicated
Solution Approach 1:
The patent extracts the harmful homogeneous catalyst from the reaction system and replaces it with a heterogeneous solid acid catalyst. This allows the catalyst to be easily separated from the reaction mixture through filtration or decantation, eliminating the need for complex neutralization steps and simplifying glycerin purification while maintaining reaction efficiency.
Solution Approach 2:
The patent introduces a solid acid catalyst as an intermediary substance that facilitates the ester exchange reaction without requiring neutralization. The solid catalyst acts as a mediator that can be easily separated from the liquid reaction products, thereby simplifying the overall purification process while maintaining high reaction productivity.
2Productivity
If glycerin is separated in a multi-stage reaction, then the reaction can be promoted with alkali catalyst, but methoxypropanediol forms as a side product deteriorating glycerin quality
Solution Approach 1:
The patent changes the key parameter of catalyst type from homogeneous alkali/acid catalyst to heterogeneous solid acid catalyst. This parameter change eliminates the formation of methoxypropanediol side products while maintaining reaction promotion, thereby improving glycerin quality without sacrificing productivity. The solid acid catalyst provides selective catalysis that prevents unwanted side reactions.
3Quantity of substance
If excess lower alcohol is used in the reaction, then the ester exchange reaction proceeds completely, but alcohol recovery becomes necessary increasing process complexity
Solution Approach 1:
The patent extracts excess lower alcohol from the reaction mixture through azeotropic distillation or other separation techniques. By removing the excess alcohol after the reaction reaches completeness, the process avoids the need for complex alcohol recovery and recycling systems, simplifying the overall process while maintaining complete reaction conversion.
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
This process efficiently produces fatty acid alkyl esters with higher yields while preventing methoxypropanediol formation, improving glycerin quality and simplifying purification, and allows for economic operation by reducing alcohol recovery and catalyst separation needs.
Implementation Method 1
reacting the oil phase obtained in step 3 with a C1 to C5 alcohol in the presence of a solid acid catalyst
Implementation Method 2
separating the product obtained in step 2 into an oil phase and an aqueous phase
Data Source
Figure 1
AI summary
Disclosed is a process for producing a fatty alkyl ester and glycerin, including step 1 of reacting fats and oils with C1 to C5 lower alcohols, step 2 of removing the lower alcohols discharged from the outlet of a rector in step 1 until the lower alcohol content is reduced to 8 wt% or less, step 3 of separating the product obtained in step 2 into oil and aqueous phases, step 4 of reacting the oil phase obtained in step 3 with lower alcohols in the presence of an acid catalyst, and step 5 of separating the product discharged from the outlet of a reactor in step 4 into oil and aqueous phases thereby giving fatty acid alkyl esters and glycerin, as well as a process for producing fatty alcohols from hydrogen and the fatty acid alkyl esters obtained in the above process.