Purifying Unsaturated Compounds Using Multi-Evaporator Segmentation
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Solution Overview
Problem
Purification of unsaturated compounds with high boiling points leads to by-product formation, resulting in reduced yield and frequent plant cleaning needs, which complicates long-term operation and requires high purity products.
Innovation Solution
A process utilizing at least two evaporators connected in a specific configuration where condensed vapors from one evaporator are introduced into the other, with a controlled mass flow ratio to minimize by-product formation and enhance purity and yield, allowing for long-term plant operation without interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional distillation or single-column purification is used, then equipment complexity is reduced, but by-product formation increases and product purity decreases
Solution Approach 1:
The purification system is divided into multiple evaporators (at least two) connected in series, where each evaporator performs a specific separation function. The first evaporator removes volatile constituents while the second evaporator further purifies the product, achieving high purity through sequential processing rather than relying on a single complex column with multiple internals.
Solution Approach 2:
The patent implements continuous circulation of the unsaturated compound through the evaporator system, where the compound is continuously evaporated, condensed, and reintroduced to the system. This continuous circulation allows for sustained high-purity product generation without interrupting the purification process, unlike batch distillation methods.
2Manufacturing precision
If multiple evaporators with circulation are used, then product purity and yield improve, but by-product formation and deposit accumulation increase
Solution Approach 1:
The patent employs short residence times in the evaporators by rapidly evaporating and condensing the unsaturated compound, minimizing the time the compound spends in the high-temperature evaporation zone. This rapid processing reduces the opportunity for polymerization and by-product formation while still achieving high purity through the sequential evaporator configuration.
Solution Approach 2:
The system operates under controlled pressure conditions (vacuum or reduced pressure) and temperature parameters that optimize evaporation efficiency while minimizing thermal degradation. By carefully controlling these parameters in each evaporator stage, the process achieves high purity without excessive by-product formation.
3Manufacturing precision
If high boiling point unsaturated compounds are purified by conventional methods, then purification is achieved, but frequent plant cleaning is required due to deposit formation
Solution Approach 1:
The rapid evaporation and condensation cycles in the multiple evaporator system minimize residence time at temperatures where polymerization occurs, significantly reducing deposit formation on equipment surfaces. This allows for extended operation periods without cleaning interruptions.
Solution Approach 2:
The system operates under inert or controlled atmospheric conditions that prevent unwanted chemical reactions and polymerization during the purification process, reducing deposit accumulation on equipment surfaces and extending operational periods between cleanings.
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 process achieves high purity and yield with low by-product formation, enabling continuous plant operation and simple, cost-effective purification of unsaturated compounds like glycol esters, particularly hydroxyalkyl (meth)acrylates, with minimal deposit formation.
Implementation Method 1
a first evaporator (1) for evaporating volatile constituents from a mixture to be purified
Implementation Method 2
the vapours condensed in the first evaporator being isolated and the vapours condensed in the second evaporator
Data Source
AI summary
Process for purifying unsaturated compounds, and a plant for performing the process. Unsaturated compound obtained by the process.