Continuous Acrolein Production via Cyclic Catalyst Regeneration
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Solution Overview
Problem
Current methods for producing acrolein from glycerol face challenges such as catalyst deactivation due to secondary reactions, leading to decreased productivity and selectivity, and require frequent catalyst regeneration, which reduces plant efficiency and increases costs.
Innovation Solution
A method involving cycles of reaction and regeneration at similar temperatures, with the regeneration step maintaining a hot spot no more than 100°C above the reaction temperature, allowing simultaneous operation in separate reactor zones, to maintain catalyst activity and extend its lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If catalyst regeneration is performed frequently to maintain activity, then catalyst efficiency is improved, but plant productivity decreases due to interruption of production
Solution Approach 1:
The catalyst bed is divided into multiple zones that can operate independently. Some zones perform dehydration reaction while others perform regeneration, allowing continuous operation without interrupting overall production. This segmentation enables parallel processing of reaction and regeneration tasks.
Solution Approach 2:
The catalyst zones alternate periodically between reaction mode and regeneration mode. Each zone switches functions in a cyclic manner, ensuring that while one zone is being regenerated, others are producing acrolein, thus maintaining continuous production flow.
2Reliability
If high temperature is used during catalyst regeneration to remove coke, then regeneration effectiveness is improved, but energy consumption increases
Solution Approach 1:
The regeneration process is combined with the reaction process in a unified continuous flow system. The hot effluent gas from the reaction zone is directly used to provide heat for the regeneration zone, eliminating the need for separate external heating and reducing overall energy consumption.
Solution Approach 2:
The system uses its own reaction heat to fuel the regeneration process. The exothermic dehydration reaction produces hot gases that are redirected to the regeneration zone, allowing the system to self-regenerate without additional external energy input.
3Reliability
If catalyst regeneration is performed at temperatures significantly higher than reaction temperature, then coke removal efficiency is improved, but catalyst deactivation due to overheating occurs
Solution Approach 1:
The regeneration temperature is carefully controlled to be moderate (not excessively high) while maintaining effective coke removal through optimized residence time and oxygen concentration. The temperature parameter is adjusted to balance regeneration effectiveness with catalyst stability.
Solution Approach 2:
The regeneration process occurs continuously at controlled temperatures rather than through intermittent high-temperature treatments. This continuous moderate heating prevents thermal shock and overheating while steadily removing coke deposits.
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 approach enables continuous, efficient production of acrolein with reduced energy consumption and capital costs, while maintaining catalyst efficiency for extended periods, thus enhancing productivity and operational safety.
Implementation Method 1
reaction of a gaseous reaction stream comprising at least glycerol, on contact with a solid acid catalyst contained in a reactor zone maintained at a temperature in the range from 250°C to 350°C to obtain a converted stream comprising at least acrolein
Implementation Method 2
regeneration of said solid catalyst with a gaseous stream comprising at least oxygen
Implementation Method 3
reactor zone maintained at a temperature in the range from 250°C to 350°C
Data Source
AI summary
The invention relates to the production of acrolein and/or acrylic acid from glycerol, and more particularly to a method for continuous production of a stream comprising acrolein by dehydration of glycerol, comprising cycles of reaction and regeneration of a dehydration catalyst.