Vinyl Compound Rectification Temperature Control
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Solution Overview
Problem
Vinyl compounds, such as methyl acrylate, tend to undergo spontaneous polymerization during rectification due to their α,β-unsaturated double bonds, leading to clogging and operational interruptions in rectification columns, despite the use of conventional polymerization inhibitors.
Innovation Solution
Controlling the temperature of the vinyl compound liquor within the rectification column to be between its bubble point and 10°C lower than the bubble point, while maintaining appropriate pressure, effectively prevents spontaneous polymerization by optimizing the distribution of inhibitors and reducing phase changes during the rectification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymerization inhibitors are used during rectification, then polymerization is partially inhibited, but spontaneous polymerization still occurs frequently and clogging happens
Solution Approach 1:
The invention changes the temperature parameter by controlling the feed temperature to be between the dew point and bubble point, rather than using conventional temperatures. This parameter change optimizes the distribution of inhibitors and reduces phase changes, effectively preventing spontaneous polymerization while maintaining rectification operation
Solution Approach 2:
The invention performs preliminary action by pre-controlling the feed temperature within the specific range before rectification begins. This preliminary temperature control ensures that inhibitors are properly distributed and phase changes are minimized from the start, preventing polymerization before it can occur during the rectification process
2Productivity
If high temperature is used during rectification, then rectification efficiency is improved, but spontaneous polymerization increases
Solution Approach 1:
The invention optimizes the temperature parameter by controlling feed temperature within the dew point to bubble point range. This parameter optimization maintains sufficient rectification efficiency while preventing the excessive temperature that would cause spontaneous polymerization, thus resolving the contradiction between productivity and polymer formation
3Productivity
If rectification operates for extended periods, then productivity increases, but clogging occurs requiring shutdown
Solution Approach 1:
The invention performs preliminary temperature control of the feed to within the optimal range before rectification begins. This preliminary action ensures stable inhibitor distribution and minimizes phase changes from the start, enabling extended continuous operation without clogging or shutdowns, thus improving both productivity and operational stability
Solution Approach 2:
The invention enables continuous rectification operation by preventing polymerization through optimized temperature control. The continuous stable operation without clogging or shutdowns maintains uninterrupted productivity while ensuring operational reliability through consistent inhibitor distribution and reduced phase changes
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 method significantly reduces spontaneous polymerization, allowing for extended stable operation of the rectification column without clogging, as demonstrated by maintaining column functionality for over 30 days without polymer buildup.
Implementation Method 1
the temperature of said fed vinyl compound liquor is in the range of from its bubble point at the pressure of said rectification column
Implementation Method 2
the temperature of said fed vinyl compound liquor is in the range of from its bubble point at the pressure of said rectification column to 10°C lower than said bubble point
Data Source
AI summary
There is provided a method for rectifying a vinyl compound liquor. The method includes the steps of a) providing a rectification column operated at a temperature and pressure and b) feeding the vinyl compound liquor to be rectified into the rectification column, wherein the pressure of the rectification column and the temperature of the fed vinyl compound liquor are controlled, such that the temperature of the fed vinyl compound liquor ranges from its bubble point at the pressure of the rectification column to 10° C. lower than the bubble point.