Methanol Carbonylation Absorber with Switchable Solvent Sources
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Solution Overview
Problem
Conventional methanol carbonylation systems for acetic acid production require expensive multiple absorber towers and high operating costs due to the use of acetic acid as a scrubber solvent, which necessitates additional purification steps and equipment.
Innovation Solution
A methanol carbonylation system with a single absorber tower capable of using different scrubber solvents, such as methanol and acetic acid, which reduces capital and operating costs by eliminating the need for dedicated light ends stripper columns and allows for flexible operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acetic acid is used as a scrubber solvent in conventional methanol carbonylation systems, then light ends components are effectively removed, but expensive multiple absorber towers and additional purification equipment are required
Solution Approach 1:
The absorber tower is designed to perform multiple functions by accepting different scrubber solvents (acetic acid, methanol, or their mixtures) through a selection valve. This multi-functionality allows a single tower to replace what would traditionally require multiple dedicated towers, reducing device complexity while maintaining scrubbing efficiency for light ends removal
Solution Approach 2:
The system incorporates a selection valve that dynamically switches between different scrubber solvent sources based on operational requirements. This dynamic configuration allows flexible adaptation of the scrubbing process, enabling the single absorber tower to handle different solvent types and maintain optimal performance without requiring multiple fixed towers
2Reliability
If acetic acid is used as a scrubber solvent, then light ends are removed effectively, but additional purification columns and steam consumption increase operating costs
Solution Approach 1:
The invention changes the parameter of scrubber solvent type by allowing selection between acetic acid, methanol, or their mixtures. This parameter change enables optimization of the scrubbing process where methanol or mixed solvents can be used in certain conditions to reduce or eliminate the need for steam-intensive purification columns, thereby reducing operating costs while maintaining effective light ends removal
3Adaptability or versatility
If multiple dedicated absorber towers are used for different scrubber solvents, then scrubbing flexibility is maintained, but capital costs increase
Solution Approach 1:
A single absorber tower is designed with universal capability to handle multiple scrubber solvent types (acetic acid, methanol, or mixtures). The tower's internal structure and operating parameters are optimized to effectively scrub light ends regardless of which solvent is selected, thereby maintaining adaptability while reducing the number of towers from multiple dedicated units to a single multi-functional unit
Solution Approach 2:
The selection valve provides dynamic switching capability between different solvent sources, enabling the single absorber tower to adapt to different operational requirements in real-time. This dynamic configuration maintains the versatility of solvent selection that would traditionally require multiple dedicated towers, while significantly reducing capital costs by eliminating redundant tower structures
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
The system achieves capital reduction, energy savings, and improved scrubbing efficiency of light ends components like methyl iodide, while maintaining high conversion rates of methanol to acetic acid, thereby optimizing the acetic acid production process.
Implementation Method 1
The absorber recovers methyl iodide and other volatiles such as methyl acetate vapor from the vent gas with scrubber solvent
Data Source
AI summary
A methanol carbonylation system 10 includes an absorber tower 75 adapted for receiving a vent gas stream and removing methyl iodide therefrom with a scrubber solvent, the absorber tower being coupled to first and second scrubber solvent sources 16, 56 which are capable of supplying different first and second scrubber solvents. A switching system including valves 90, 92, 94, 96, 98 alternatively provides first or second scrubber solvents to the absorber tower and returns the used solvent and sorbed material to the carbonylation system to accommodate different operating modes.