Direct Synthesis of Methacrolein from Ethers
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Solution Overview
Problem
Current (meth)acrolein synthesis processes face challenges such as high environmental impact, significant investments, and operating costs due to reliance on fossil-based raw materials and energy-intensive dehydration reactions, with limitations in scalability and catalyst durability.
Innovation Solution
A direct synthesis process using a reactive mixture of ethers or hemiacetals derived from linear alcohols, combined with oxygen and a non-reactive diluent gas, in the presence of a molybdenum-based oxidation catalyst, facilitating a one-step reaction at controlled temperatures and pressures to produce (meth)acrolein with improved selectivity and reduced water generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If glycerol dehydration route is used to produce acrolein, then renewable raw material is utilized, but catalyst deactivates quickly requiring regular regenerations and additional investment costs
Solution Approach 1:
The invention changes the chemical parameters by using different raw materials (ethers and acetals instead of glycerol) and modifies the reaction conditions (gas phase oxidation at 200-400°C) to achieve a process that produces less water and avoids catalyst deactivation issues while maintaining environmental benefits
Solution Approach 2:
The invention extracts the problematic dehydration step from the process by using oxidation of ethers/acetals instead, thereby eliminating the catalyst deactivation issue associated with glycerol dehydration while retaining the ability to produce acrolein from renewable sources
2Productivity
If glycerol dehydration is performed in gas phase, then acrolein is produced, but energy consumption is high due to fossil fuel dependency
Solution Approach 1:
The invention changes the energy parameters by conducting the reaction in the liquid phase at milder temperatures (20-150°C) compared to conventional gas phase dehydration, thereby reducing energy consumption and fossil fuel dependency while maintaining productivity
3Productivity
If aldolization route using acetaldehyde and formalin is used, then acrolein is synthesized, but significant investment is required for synthesis units and raw material storage
Solution Approach 1:
The invention extracts and eliminates the complex multi-step aldolization process by directly oxidizing ethers or acetals to acrolein in a single step, thereby removing the need for separate synthesis units for acetaldehyde and formalin and simplifying the overall process configuration
Solution Approach 2:
Instead of building up acrolein through sequential aldolization steps from simpler molecules, the invention inverts the approach by directly oxidizing carbon-oxygen bonded compounds (ethers/acetals) to acrolein, thereby simplifying the process flow and reducing equipment requirements
4Productivity
If oxidation of propylene is used to produce acrolein, then acrolein is manufactured, but fossil raw materials are consumed and transport costs increase
Solution Approach 1:
The invention changes the raw material parameters by using renewable-derived ethers and acetals (from C1-C3 alcohols) instead of fossil-based propylene, thereby reducing environmental impact and transport costs while maintaining acrolein production capability
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 simplifies the synthesis by reducing investment and operating costs, minimizing water production, and enhancing product concentration, while using renewable raw materials to lower environmental impact.
Implementation Method 1
in the presence of a solid oxidation catalyst chosen from molybdenum-based catalysts
Implementation Method 2
reaction of a reactive mixture comprising at least one compound chosen from ethers, acetals or hemiacetals derived from linear alcohols, oxygen and a non-reactive diluent gas
Data Source
AI summary
The subject matter of the present invention is a process for direct synthesis of (meth)acrolein from a reactive mixture comprising at least one compound chosen from ethers, acetals or hemiacetals derived from linear alcohols comprising from 1 to 3 carbon atoms. Examples of compounds are dimethyl ether, diethyl ether, methyl ethyl ether, dimethoxymethane, diethoxymethane, dipropoxymethane, 1,1-dimethoxyethane or 1,1-diethoxyethane. The process of the invention comprises two successive phases: oxidation then aldol condensation, which can be carried out in the presence of a solid oxidation catalyst chosen from molybdenum-based catalysts and optionally of an aldol condensation catalyst. These two phases are carried out in a reaction system comprising a single reactor or optionally two reactors in cascade.