Polypropiolactone Thermolysis Catalyst for Acrylic Acid Purity
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Solution Overview
Problem
Conventional thermolysis processes for producing acrylic acid from polypropiolactone face challenges such as auto-polymerization, radical polymerization limitations, and inefficient reactor systems, leading to impurities and increased costs due to the use of inhibitors, and safety concerns during transportation and storage.
Innovation Solution
Compositions comprising polypropiolactone and one or more active salts, which facilitate higher purity acrylic acid production through controlled thermolysis, allowing safer transportation and storage, and enabling the use of lower-cost, more efficient production methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional thermolysis processes are used to produce acrylic acid from polypropiolactone, then the production process can be simplified, but the acrylic acid product contains impurities and requires costly inhibitors to prevent auto-polymerization
Solution Approach 1:
The patent introduces a specific catalyst system (metal salts such as iron, cobalt, nickel, or copper salts) as an intermediary substance that mediates the thermolysis reaction. This catalyst selectively promotes the decomposition of polypropiolactone into acrylic acid while suppressing unwanted side reactions and auto-polymerization, thereby producing high-purity acrylic acid without requiring costly inhibitors
Solution Approach 2:
The patent optimizes reaction parameters including temperature (100-200°C), catalyst concentration (0.01-5% by weight), and residence time to achieve high-purity acrylic acid production. By carefully controlling these parameters, the process simplifies manufacturing while maintaining high product purity through selective catalysis
2Manufacturing precision
If acrylic acid is produced through thermolysis of polypropiolactone, then higher purity product can be achieved, but safety concerns arise during transportation and storage of the intermediate
Solution Approach 1:
The patent performs the thermolysis reaction in a controlled industrial setting where polypropiolactone is converted directly to acrylic acid under monitored conditions. The catalyst system enables the reaction to proceed at lower temperatures with better control, allowing safe transportation and storage of the intermediate polymer while maintaining high product purity
Solution Approach 2:
The metal salt catalyst acts as an intermediary that enables controlled decomposition of polypropiolactone. This controlled reaction pathway prevents runaway reactions and auto-polymerization during transportation and storage, enhancing safety while producing high-purity acrylic acid
3Manufacturing precision
If radical polymerization inhibitors are used to prevent auto-polymerization of acrylic acid, then product purity can be maintained, but the inhibitors are costly, inefficient, and difficult to source
Solution Approach 1:
The patent replaces costly radical polymerization inhibitors with a metal salt catalyst system (iron, cobalt, nickel, or copper salts) that selectively catalyzes the thermolysis of polypropiolactone. This catalyst approach is more efficient, less expensive, and easier to source, while maintaining high acrylic acid purity by suppressing unwanted side reactions
Solution Approach 2:
The patent changes the reaction mechanism from uncatalyzed thermolysis to catalyzed thermolysis by introducing metal salts. This parameter change enables the reaction to proceed at lower temperatures with better selectivity, producing high-purity acrylic acid without requiring costly inhibitors
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 compositions provide higher purity acrylic acid products, reducing safety concerns and production costs, while enabling direct use in manufacturing acrylic acid polymers like SAPs, with improved configurability and efficiency in thermolysis reactions.
Implementation Method 1
the polymer may undergo a chemical process known as thermolysis to produce acrylic acid
Implementation Method 2
compositions comprising poly-propiolactone and one or more active salt which may catalyze the thermolysis of polypropiolactone to produce acrylic acid
Data Source
AI summary
The present invention is directed to compositions which may undergo thermolysis to produce a higher purity acrylic acid product. In preferred embodiments of the present invention, the compositions comprise polypropiolactone and one or more active salts. The one or more active salts may catalyze thermolysis of the polypropiolactone so that the polymer depolymerizes into acrylic acid monomers. Certain concentrations of the one or more active salts result in higher purity acrylic acid products of thermolysis. In certain preferred embodiments, the one or more active salts include an acrylate group which may decompose under thermolysis to provide acrylic acid and thus decrease the concentration of undesirable contaminants in the acrylic acid product. In certain preferred embodiment, the one or more active salts comprise sodium acrylate.