Batch Crystallizer Preliminary Cooling for Acrylic Acid
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Solution Overview
Problem
The production of high-purity (meth)acrylic acid through gas-phase oxidation requires multiple stages of crystallization purification due to the presence of impurities, which complicates and costs more due to the need for multiple crystallizers, and lacks efficient heating and cooling conditions, hindering production efficiency.
Innovation Solution
A process involving a batch-type crystallizer that efficiently shifts from a heating medium to a cooling medium during the transfer of melted (meth)acrylic acid liquid, allowing preliminary cooling of the crystallizer before the next crystallization step, enabling smoother transitions and improved production efficiency without additional facilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple crystallization stages are used to purify (meth)acrylic acid, then purification effectiveness is improved, but device complexity and cost increase due to needing multiple crystallizers
Solution Approach 1:
The crystallizer is designed to perform multiple functions: crystallization purification, melting of crystals, and preliminary cooling for the next cycle. This multi-functionality allows a single crystallizer to replace what would traditionally require multiple separate units, reducing device complexity while maintaining purification effectiveness through repeated cycles
2Manufacturing precision
If multiple crystallization stages are implemented, then purification effectiveness is improved, but production time increases
Solution Approach 1:
The crystallizer operates in continuous cyclic cycles of crystallization, melting, and preliminary cooling. By overlapping these operations and eliminating idle time between stages, the system maintains continuous useful action, reducing total production time while achieving the necessary purification through multiple cycles
Solution Approach 2:
Preliminary cooling is performed during the melting phase, preparing the crystallizer for the next crystallization cycle before it is actually needed. This preliminary action reduces waiting time and ensures the crystallizer is ready immediately when the melted liquid is transferred, thereby reducing overall production time
3Ease of operation
If heating and cooling operations are performed sequentially in separate steps, then operational simplicity is maintained, but production efficiency decreases due to idle time
Solution Approach 1:
The crystallizer operates in periodic cycles that alternate between heating (for melting) and cooling (for crystallization). This periodic action allows the system to maintain operational simplicity through standardized cycles while improving productivity by continuously utilizing the crystallizer without idle transition time
Solution Approach 2:
The cooling medium is introduced during the liquid transfer phase, performing preliminary cooling before the next crystallization step begins. This preliminary action prepares the crystallizer in advance, eliminating idle time and improving production efficiency while maintaining operational simplicity through a standardized sequence
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 process enhances the production efficiency of (meth)acrylic acid by allowing a seamless shift from melting to crystallization steps, maintaining high purity and reducing production time, thus improving overall industrial efficiency.
Implementation Method 1
supplying a cooling medium to the crystallizer to cool the crystallizer during the transfer of the melted liquid from the crystallizer
Implementation Method 2
crystallizing (meth)acrylic acid from a crude (meth)acrylic acid solution
Implementation Method 3
crystallizing (meth)acrylic acid from a crude (meth)acrylic acid solution
Implementation Method 4
melting the obtained (meth)acrylic acid crystal to obtain a (meth)acrylic acid melted liquid
Data Source
Figure 1
AI summary
The objective of the present invention is to provide a process for production of (meth)acrylic acid with improved production efficiency by efficiently shifting from heating procedure to cooling procedure for a crystallizer. A process for production of (meth)acrylic acid according to the present invention is characterized in comprising the steps of crystallizing (meth) acrylic acid from a crude (meth) acrylic acid solution by using a batch type crystallizer, and melting the obtained (meth)acrylic acid crystal to obtain a (meth)acrylic acid melted liquid; wherein preliminary cooling of the crystallizer for the next crystallization step is started during transferring the (meth)acrylic acid melted liquid from the crystallizer.