Perfluorocarbon Pyrolysis for Chlorine-Free TFE Production
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Solution Overview
Problem
Current methods for producing tetrafluoroethene (TFE) and hexafluoropropene (HFP) involve chlorinated raw materials, leading to costly purification processes and hydrochloric acid by-products, while seeking alternatives that do not use chlorine-containing materials and aim to reduce energy costs by generating difluorocarbenes at lower temperatures.
Innovation Solution
A chlorine-free process involving the thermal decomposition of perfluorocarbons in the presence of hydrogen, where difluorocarbenes are formed at temperatures between 580 K and 2000 K, and the reaction mixture is quenched to produce TFE and HFP, with the option to recycle hydrogen and by-products, forming a closed-loop system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal pyrolysis of chlorinated raw materials (CHCIF2) is used to manufacture TFE and HFP, then high production yield is achieved, but chlorinated by-products and hydrochloric acid are formed requiring expensive purification and waste disposal
Solution Approach 1:
The patent removes chlorine from the raw material composition entirely, using only fluorinated hydrocarbons (perfluorocarbons) as feedstock. This extraction of the harmful chlorine element eliminates the formation of chlorinated by-products and hydrochloric acid, while maintaining the desired production of TFE and HFP through alternative pyrolysis pathways
Solution Approach 2:
The patent converts the previously harmful chlorinated by-products into beneficial outcomes by using fluorinated hydrocarbons instead. The pyrolysis of perfluorocarbons generates the desired olefin products without creating harmful waste streams, effectively transforming a harmful process into a clean one
2Productivity
If thermal pyrolysis of chlorinated raw materials is used to manufacture TFE and HFP, then high production yield is achieved, but expensive purification steps are required to remove chlorinated impurities
Solution Approach 1:
The patent eliminates the need for expensive purification steps by removing the source of impurities (chlorine) from the raw materials. Using fluorinated hydrocarbons as feedstock ensures that the pyrolysis products can be obtained with high purity directly, avoiding the need for costly separation processes to remove chlorinated by-products
3Object-generated harmful factors
If thermal decomposition of fluorinated materials at high temperatures is used to avoid chlorine, then chlorinated by-products are eliminated, but energy consumption increases
Solution Approach 1:
The patent optimizes the temperature parameter of the pyrolysis process to achieve a balance between eliminating chlorinated by-products and controlling energy consumption. By using fluorinated hydrocarbons as feedstock and controlling the pyrolysis conditions, the process achieves clean production without requiring excessively high temperatures, thus reducing energy consumption while maintaining the elimination of harmful by-products
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 reduces energy costs, eliminates chlorinated by-products and waste streams, and achieves high yields of TFE and HFP with simplified purification, making it environmentally advantageous and cost-effective.
Implementation Method 1
pyrolyzing at least one perfluorinated hydrocarbon, or a material containing at least one perfluorinated hydrocarbon, in a pyrolysis zone at a temperature between 580 K and 2000 K in the presence of hydrogen to yield a reaction mixture containing difluorocarbene
Implementation Method 2
Upon quenching difluorocarbenes may dimerise to produce TFE (C2F4)
Data Source
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AI summary
A process is described of pyrolyzing at least one perfluorinated hydrocarbon, or a material containing at least one perfluorinated hydrocarbon, in the presence of hydrogen, to yield a reaction mixture containing difluorocarbene.