Dehydrofluorination Catalyst Selectivity for HCFC-1233zd
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Solution Overview
Problem
Current processes for producing 1-chloro-3,3,3-trifluoropropene (HCFC-1233zd) lack high selectivity, leading to inefficient production and by-product formation.
Innovation Solution
A dehydrofluorination process using catalysts such as halogenated trivalent or higher valent metal oxides, trivalent or higher valent metal halides, and natural or synthetic graphites to convert 3-chloro-1,1,1,3-tetrafluoropropane into HCFC-1233zd, with specific operating conditions and catalyst regeneration to enhance selectivity and conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional processes are used for producing HCFC-1233zd, then production can proceed with standard methods, but selectivity is low leading to inefficient production and by-product formation
Solution Approach 1:
The patent applies parameter changes by optimizing reaction conditions including temperature (200-400°C), pressure (1-20 atm), and residence time (0.1-60 seconds) to achieve high selectivity for HCFC-1233zd production while maintaining efficient productivity through controlled dehydrofluorination parameters
Solution Approach 2:
The patent uses catalysts as intermediaries to facilitate the dehydrofluorination reaction. Specific catalysts including metal halides (AlCl3, FeCl3, CuCl2), metal oxides (Al2O3, Fe2O3, CuO), and zeolites are employed to enhance selectivity toward HCFC-1233zd while improving production efficiency by lowering activation energy and directing reaction pathways
2Manufacturing precision
If dehydrofluorination is performed without optimized conditions, then the process is simpler, but by-products like HFC-1234ze are formed reducing selectivity
Solution Approach 1:
The patent optimizes reaction parameters including temperature (200-400°C), pressure (1-20 atm), and residence time (0.1-60 seconds) to maximize selectivity for HCFC-1233zd while minimizing by-product formation, achieving up to 90% selectivity through controlled dehydrofluorination conditions
Solution Approach 2:
Catalysts serve as intermediaries to enhance selectivity without requiring complex process equipment. The use of catalysts such as metal halides, metal oxides, and zeolites allows the reaction to proceed with high selectivity under relatively simple conditions, avoiding the need for complex separation and purification systems
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 process achieves high selectivity and conversion rates for HCFC-1233zd production, minimizing by-products like HFC-1234ze, with selectivity of 50% or more and conversion of 10% or more, preferably up to 95% and 90% respectively, using optimized temperature, pressure, and residence time conditions.
Implementation Method 1
dehydrofluorinating 3-chloro-1,1,1,3-tetrafluoropropane (244fa) under conditions sufficient to effect dehydrofluorination in the presence of a catalyst
Data Source
AI summary
A process for making 1-chloro-3,3,3-trifluoropropene. The process has the following step: dehydrofluorinating 3-chloro-1,1,1,3-tetrafluoropropane under conditions sufficient to effect dehydrofluorination in the presence of a catalyst. Preferred catalysts are selected from the group consisting of (i) one or more halogenated trivalent or higher valent metal oxides, (ii) one or more trivalent or higher valent metal halides, and (iii) one or more natural or synthetic graphite materials.