Beta Propiolactone to Acrylic Acid Conversion via Integrated Polymerization and Pyrolysis
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Solution Overview
Problem
Current methods for producing acrylic acid from beta propiolactone are inefficient and costly due to contamination issues with water or alcohol catalysts and require extensive multi-step processes, which are capital intensive and inefficient.
Innovation Solution
A method involving a feedstock stream of beta propiolactone and a solvent, contacted with a polymerization catalyst in a reaction zone maintained at or above the pyrolysis temperature of poly(propiolactone), allowing concurrent polymerization and thermal decomposition to produce acrylic acid, with a distillation stream of the solvent withdrawn, thereby consolidating processes and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water or alcohol is used as catalyst to convert BPL to acrylic acid, then the conversion reaction can proceed, but the acrylic acid stream becomes contaminated with water or alcohol
Solution Approach 1:
The harmful substance (water or alcohol catalyst) is extracted and removed from the reaction system by using a solvent that forms an azeotrope with the catalyst, allowing the catalyst to be separated via distillation while the acrylic acid product remains in the reaction zone
Solution Approach 2:
A solvent acts as an intermediary substance that facilitates the separation of the catalyst from the product stream by forming an azeotrope with the catalyst, enabling selective removal of the catalyst through distillation
2Productivity
If BPL is first polymerized to PPL, isolated, and then fed to pyrolysis unit, then acrylic acid can be produced, but extensive unit operations and capital investment are required
Solution Approach 1:
The polymerization and pyrolysis processes are merged into a single reaction zone, allowing BPL to be converted directly to acrylic acid through sequential reactions within the same reactor, eliminating the need for separate isolation and pyrolysis units
Solution Approach 2:
The reaction zone performs multiple functions: it facilitates polymerization of BPL to PPL, subsequent pyrolysis of PPL to acrylic acid, and simultaneous distillation of solvent and catalyst, replacing multiple specialized units with a single multi-functional reactor
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 approach reduces capital costs by integrating multiple processes into a single reactor, enhances manufacturing efficiency, and minimizes contamination, resulting in a more cost-effective and efficient production of high-purity acrylic acid.
Implementation Method 1
at least a portion of the beta propiolactone is converted to poly(propiolactone)
Implementation Method 2
maintaining the reaction zone at a temperature at or above the pyrolysis temperature of poly(propiolactone) such that the thermal decomposition of poly(propiolactone) produces acrylic acid
Implementation Method 3
withdrawing a distillation stream of the first solvent from the reaction zone
Data Source
AI summary
Provided are integrated processes for the conversion of beta propiolactone to acrylic acid. Systems for the production of acrylic acid are also provided.