2,3,3,3-Tetrafluoropropene Production via Integrated Reactor Sequencing
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Solution Overview
Problem
Current processes for producing 2,3,3-tetrafluoropropene are inefficient due to differences in reaction rates between steps, leading to energy loss and increased equipment costs, as they require separate reactors and extensive distillation for separation, which is costly and energy-intensive.
Innovation Solution
The process involves a two-stage reaction where the tetrafluoropropene-producing reaction is performed with a reactor upstream of the trifluoropropene-producing reaction, allowing for reduced hydrogen chloride separation needs and utilizing thermal energy from the tetrafluoropropene-producing reaction to save heating energy, with specific temperature and catalyst conditions optimizing yield and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate reactors are used for each reaction step with distillation columns for separation, then the manufacturing precision and reliability are improved, but the device complexity and energy consumption increase significantly
Solution Approach 1:
The patent combines two separate reaction steps into a single reactor system. The first reaction (producing 2-chloro-3,3,3-trifluoropropene) and the second reaction (producing 2,3,3,3-tetrafluoropropene) are performed sequentially in the same reactor, eliminating the need for separate reactors and intermediate separation equipment. This merging approach reduces device complexity while maintaining reaction efficiency through optimized temperature control and catalyst selection.
Solution Approach 2:
The single reactor is designed to perform multiple functions: it conducts both the first fluorination reaction and the second fluorination reaction, and also serves as the separation vessel where hydrogen chloride is removed. This multi-functionality eliminates the need for dedicated separation equipment and reduces the overall number of process units required.
2Manufacturing precision
If distillation columns are used to separate unreacted starting materials and products, then the purity is improved, but the energy loss increases due to cooling and reheating
Solution Approach 1:
The patent extracts and removes hydrogen chloride from the reaction mixture directly in the reactor during the reaction process, rather than performing separation after the reaction is complete. This in-situ removal prevents energy loss associated with cooling the reaction mixture for distillation and then reheating it for the next reaction step, while still achieving the necessary purity for the subsequent reaction.
3Manufacturing precision
If multiple distillation columns are used for separation, then the purity is improved, but the equipment costs increase
Solution Approach 1:
The patent merges the separation function with the reaction function by performing hydrogen chloride removal directly in the reactor. This eliminates the need for multiple distillation columns and reduces equipment costs, while still achieving the necessary separation efficiency for the process to proceed effectively.
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 enables efficient production of 2,3,3-tetrafluoropropene with reduced energy and equipment costs by minimizing hydrogen chloride separation and effectively using thermal energy, resulting in a high yield and economically advantageous industrial process.
Implementation Method 1
reacting anhydrous hydrogen fluoride with at least one chlorine-containing compound selected from the group consisting of 1,1,1,2,3-pentachloropropane, 2,3-dichloro-1,1,1-trifluoropropane, and 1,1,2,3-tetrachloropropene in a gas phase in the presence of a fluorination catalyst
Implementation Method 2
the tetrafluoropropene-producing reaction can be performed at a temperature higher than that in the trifluoropropene-producing reaction, and thus heating energy required for the trifluoropropene-producing reaction can be saved or reduced by effectively using thermal energy of the tetrafluoropropene-producing reaction
Implementation Method 3
CCl3CHClCH2Cl+3HF→CF3CCl═CH2+4HCl
Data Source
AI summary
The present invention provides a process for producing 2,3,3,3-tetrafluoropropene, comprising the steps of producing 2-chloro-3,3,3-trifluoropropene by reacting anhydrous hydrogen fluoride with a specific chlorine-containing compound in a gas phase in the presence of a fluorination catalyst while heating; and producing 2,3,3,3-tetrafluoropropene by reacting 2-chloro-3,3,3-trifluoropropene with anhydrous hydrogen fluoride in a gas phase in the presence of a fluorination catalyst while heating, the step of producing 2-chloro-3,3,3-trifluoropropene being performed after the step of producing 2,3,3,3-tetrafluoropropene. According to the process, 2,3,3,3-tetrafluoropropene can be produced with reduced energy and equipment costs in an economically advantageous manner.