Acrylic Acid Production Temperature Profiling Against Catalyst Deactivation
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Solution Overview
Problem
The production of acrylic acid is hindered by catalyst deactivation due to coke formation during lactic acid dehydration reactions, leading to a decrease in yield over time.
Innovation Solution
Control the lactic acid dehydration reaction temperature using a positive quadratic function relative to elapsed time, maintaining the temperature within a range of 350°C to 400°C, and adjusting it according to the reaction's progression to prevent catalyst deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If lactic acid dehydration reaction is performed on an acid catalyst, then acrylic acid is produced through main reaction, but coke is formed by side reactions which cover catalyst active sites causing catalyst deactivation and gradual decrease in acrylic acid yield
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the reaction temperature according to a predetermined program during the dehydration reaction. The temperature is increased in stages (e.g., from 300°C to 400°C over several hours) to compensate for catalyst deactivation caused by coke formation, thereby maintaining acrylic acid yield without requiring catalyst replacement or regeneration.
2Productivity
If reaction temperature is increased to maintain acrylic acid yield, then catalyst deactivation is compensated, but energy consumption increases and side reactions may be promoted
Solution Approach 1:
The patent implements dynamics by using a programmable temperature profile that dynamically adjusts the reaction temperature based on reaction progress and catalyst deactivation程度. Rather than maintaining a constantly high temperature, the system optimizes energy usage by increasing temperature only when necessary to compensate for catalyst activity loss, thereby balancing productivity with energy consumption.
3Quantity of substance
If reaction is allowed to proceed for extended periods to maximize production, then more acrylic acid can be produced, but catalyst deactivation accumulates leading to yield decrease
Solution Approach 1:
The patent applies preliminary action by pre-programming the temperature adjustment schedule before the reaction begins. The control system is configured with predetermined temperature profiles that anticipate catalyst deactivation and proactively adjust temperature to maintain optimal reaction conditions throughout extended operation periods, maximizing total production while maintaining yield rates.
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
Maintains acrylic acid yield at a constant level or higher by mitigating catalyst deactivation, ensuring efficient production even after prolonged reaction times.
Implementation Method 1
supplying a feed stream containing lactic acid gas to a dehydration reactor filled with a catalyst to perform a lactic acid dehydration reaction
Implementation Method 2
controlling the lactic acid dehydration reaction temperature in the form of a positive quadratic function relative to the elapsed time of the dehydration reaction, wherein the lactic acid dehydration reaction is performed in a temperature range of 350°C or more to 400°C or less
Data Source
Figure 1~2
AI summary
The present disclosure relates to a method for producing acrylic acid. Specifically, the present disclosure relates to a method for producing acrylic acid, comprising a method of controlling the reaction temperature so as to maintain the acrylic acid yield in accordance with the progress of the reaction.