HCFO E-to-Z Isomerization for High-Purity 1224yd Production
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Solution Overview
Problem
Existing methods for producing (Z)-1-chloro-2,3,3,3-tetrafluoropropene (HCFO-1224yd) and (Z)-1,2-dichloro-3,3,3-trifluoropropene (HCFO-1223xd) result in mixtures of E- and Z-isomers, necessitating an industrially advantageous and efficient method for selective production of one isomer and minimizing by-product formation.
Innovation Solution
An isomerization reaction is employed to convert the E-isomer of HCFO-1224yd or HCFO-1223xd into their respective Z-isomers, utilizing a metal catalyst or radical generator under specific conditions to achieve high conversion rates while inhibiting by-product production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional dehydrochlorination or dehydrofluorination methods are used to produce HCFO-1224yd, then production efficiency is achieved, but the product is obtained as a mixture of E-isomer and Z-isomer which is inconvenient for selective use
Solution Approach 1:
The invention changes the reaction parameters by using specific base catalysts (alkali metal hydroxides or alkaline earth metal hydroxides) and controlling the reaction temperature (50-100°C) and time (0.5-2 hours) to achieve selective production of Z-isomer HCFO-1224yd with 90% or higher purity, resolving the contradiction between productivity and isomer selectivity
2Productivity
If hydrogen reduction is performed on HCFO-1224yd mixture to produce HFO-1234yf, then the target product is obtained, but by-products are generated and additional separation steps are required
Solution Approach 1:
The invention performs preliminary action by first selectively producing pure Z-isomer HCFO-1224yd through dehydrofluorination before hydrogen reduction. This preliminary purification step ensures that the subsequent hydrogen reduction reaction produces HFO-1234yf with minimal by-products, eliminating the need for complex separation steps
3Manufacturing precision
If separation processes are applied to separate E-isomer and Z-isomer, then pure Z-isomer can be obtained, but the process complexity and cost increase
Solution Approach 1:
The invention performs preliminary action by designing a reaction system that directly produces pure Z-isomer HCFO-1224yd through selective dehydrofluorination, eliminating the need for subsequent separation processes. This approach achieves high isomer purity (90% or higher) while keeping the process simple and cost-effective
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 method efficiently produces the desired Z-isomer with reduced by-products, allowing for high-purity separation through distillation, thereby enhancing industrial efficiency and product purity.
Implementation Method 1
utilizing a metal catalyst or radical generator under specific conditions to achieve high conversion rates
Implementation Method 2
utilizing a metal catalyst or radical generator under specific conditions to achieve high conversion rates
Implementation Method 3
allowing for high-purity separation through distillation
Data Source
AI summary
There is provided an industrially advantageous and efficient method of producing a Z-isomer of HCFO-1224yd or HCFO-1223xd by isomerizing an E-isomer thereof. The method produces HCFO (Z-isomer) by causing specific HCFO (E-isomer) contained in a raw material composition to undergo an isomerization reaction under a condition where the HCFO (E-isomer) is isomerized.