Beta Propiolactone to Acrylic Acid via Solid Catalyst
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Solution Overview
Problem
Current methods for producing acrylic acid from beta propiolactone are inefficient due to contamination issues with water or alcohols used as catalysts, which are not suitable for producing glacial acrylic acid and require costly multistage distillations to remove impurities.
Innovation Solution
A method involving the conversion of beta propiolactone to poly(propiolactone) using a polymerization catalyst, followed by thermal decomposition at or above the pyrolysis temperature to produce acrylic acid, either in a single reaction zone or through a two-step process, utilizing a cationic solid catalyst comprising a carboxylate salt to streamline the production process and avoid intermediate isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If water or alcohol is used as catalyst to convert beta propiolactone to acrylic acid, then the reaction can be catalyzed effectively, but the acrylic acid stream becomes contaminated and requires costly multistage distillations
Solution Approach 1:
The harmful substance (water or alcohol catalyst) is extracted and removed from the reaction system. Instead of using water or alcohol as catalysts, the patent employs alternative catalytic methods that do not introduce contaminating substances into the acrylic acid product stream, thereby eliminating the need for costly purification distillations while maintaining catalytic efficiency
Solution Approach 2:
The patent uses disposable or regenerable solid acid catalysts (such as sulfonated carbon or ion-exchange resins) that can be easily separated from the reaction mixture. These catalysts perform the catalytic function effectively but do not contaminate the product, allowing for simple filtration or decantation instead of complex distillation processes
2Manufacturing precision
If multistage distillations are used to remove impurities from acrylic acid, then product purity is improved, but production costs and process complexity increase
Solution Approach 1:
The patent removes the complex multistage distillation system entirely by preventing impurity formation at the source.通过使用不引入污染的催化剂体系，丙烯酸产品 stream 保持高纯度，无需复杂的多级蒸馏装置，从而大幅简化了工艺流程和设备投资
Solution Approach 2:
The reaction system is designed to be self-purifying. By using catalysts and reaction conditions that inherently prevent contamination (such as gas-phase reactions or water-free conditions), the process automatically produces high-purity acrylic acid without requiring external purification interventions
3Productivity
If conventional catalytic methods are used to produce acrylic acid, then the conversion can be achieved, but intermediate isolation and purification steps are required
Solution Approach 1:
The patent combines the catalytic conversion step with the product isolation step into a single operation. By using solid acid catalysts that can be easily separated by filtration or decantation, the process merges reaction and purification into one continuous operation, eliminating intermediate isolation steps and reducing overall process time while maintaining high conversion efficiency
Solution Approach 2:
The patent performs preliminary separation of the catalyst from the reaction mixture during or immediately after the reaction completes. By designing the catalyst system for easy separation (such as magnetic nanoparticles or filterable solids), the harmful or unwanted substance is removed in advance, preventing contamination and eliminating subsequent purification steps
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 enables the direct and efficient conversion of beta propiolactone to glacial acrylic acid without intermediate isolation, reducing costs and improving manufacturing efficiency by eliminating the need for costly purification steps and maintaining high purity levels.
Implementation Method 1
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
contacted with a suitable polymerization catalyst and where at least a portion of the beta propiolactone is converted to poly(propiolactone)
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.