Purifying 1230xa Feedstock to Extend Catalyst Life
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Solution Overview
Problem
Current methods for producing hydrofluoroolefins like 2,3,3-tetrafluoropropene (HFO-1234yf) face challenges such as catalyst degradation and deactivation due to impurities in the feed streams, leading to reduced efficiency and increased costs, with existing solutions like polymerization inhibitors and oxygen addition causing additional issues like clogging and decreased catalyst activity.
Innovation Solution
The process involves purifying the 1,1,2,3-tetrachloropropene feed stock to be substantially free of impurities, particularly ionic metals and organic compounds, to extend catalyst life and improve reaction efficiency, by using methods like distillation and chromatography to achieve low impurity levels, allowing for continuous production without polymerization inhibitors or supplied oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If impurities are present in the feed stream, then the process can operate continuously without frequent interruptions, but the catalyst degrades and deactivates rapidly
Solution Approach 1:
The feed stream is purified before entering the reactor to remove impurities that would cause catalyst degradation. This preliminary action prevents catalyst deactivation and extends catalyst life while maintaining high reaction efficiency throughout extended operation periods
Solution Approach 2:
Impurities including ionic metals and organic compounds are extracted from the feed stream through purification processes. This removal of harmful components prevents catalyst poisoning and maintains sustained catalytic activity
2Duration of action of stationary object
If polymerization inhibitors are added to prevent catalyst deactivation, then catalyst life is extended, but the system becomes prone to clogging
Solution Approach 1:
Instead of adding chemical inhibitors that cause clogging, the process converts the harmful effect of impurities into a beneficial purification step. By removing impurities beforehand, the system achieves catalyst protection without introducing substances that would cause operational problems
Solution Approach 2:
A purification process acts as an intermediary between the feed stream and the reactor. This intermediate step removes impurities before they can reach the catalyst, eliminating the need for polymerization inhibitors and their associated clogging issues
3Stability of the object's composition
If oxygen is supplied to extend catalyst lifetime, then catalyst stability improves, but catalyst activity decreases
Solution Approach 1:
Rather than using oxygen to stabilize the catalyst (which reduces activity), the process converts the stability problem into a purification problem. By removing impurities that cause degradation, the catalyst maintains both stability and high activity without oxygen addition
4Duration of action of stationary object
If feed stream is purified to remove impurities, then catalyst life is extended, but additional process steps are required
Solution Approach 1:
Purification is performed as a preliminary action before the main reaction process. This upfront removal of impurities extends catalyst life and enables continuous operation, with the added benefit of improving reaction efficiency and reducing downstream separation requirements
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 results in prolonged catalyst life, increased conversion rates, and improved reaction efficiency, enabling continuous operation for at least 100 hours with high selectivity and conversion of 1,1,2,3-tetrachloropropene to 2-chloro-3,3,3-trifluoropropene, reducing the need for frequent catalyst reactivation or replacement.
Implementation Method 1
contacting said starting composition with a fluorinating agent to produce a final composition comprising 2-chloro-3,3,3-trifluoropropene
Implementation Method 2
by using methods like distillation and chromatography to achieve low impurity levels
Implementation Method 3
by using methods like distillation and chromatography to achieve low impurity levels
Data Source
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AI summary
The present invention relates, in part, to the discovery that the presence of impurities in 1, 1, 2, 3-tetrachloropropene (1230xa) results in catalyst instability during the fluorination of 1230xa to 2-chloro-3, 3, 3-trifluoropropene. By substantially removing the impurities, it is shown that the catalyst life is extended and results in improved operation efficiency of the fluorination reaction. Such steps similarly result in an overall improvement in the production of certain hydrofluoroolefins, particularly 2, 3, 3, 3-tetrafluoropropene (1234yf).