Plant for producing 2,3,3,3-tetrafluoropropene
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing 2,3,3-tetrafluoropropene (HFO-1234yf) require high operating pressures due to the low boiling points of HCl and HFO-1234yf, leading to complex and costly compression processes, making it challenging to operate the fluorination reaction at moderate pressures.
Innovation Solution
A method involving reactive fluorination of halopropane/halopropene with hydrogen fluoride, followed by cooling, partial condensation, separation into gaseous and liquid fractions, and subsequent compression and distillation at optimized pressures, allowing for the production of HFO-1234yf at moderate pressures without the need for excessive compressor capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high operating pressure is used for distillation to condense gases with low boiling points, then condensation efficiency is improved, but equipment complexity and compression costs increase
Solution Approach 1:
The patent divides the gaseous stream from the fluorination reactor into two separate fractions: a gaseous fraction containing HFO-1234yf and a liquid fraction containing HF and HCl. Each fraction is processed independently at different pressures - the gaseous fraction is compressed to distillation pressure while the liquid fraction is pumped. This segmentation allows the distillation column to receive both fractions at the required pressure without requiring excessive compression capacity, thereby reducing equipment complexity while maintaining effective condensation.
2Adaptability or versatility
If the fluorination reaction is operated at high pressure to match distillation requirements, then integration is improved, but reaction safety and controllability worsen
Solution Approach 1:
The patent implements dynamic pressure management by operating the fluorination reaction at low pressure (0.1-10 bar) for safety and controllability, then dynamically compressing only the necessary gaseous fraction to the higher pressure required for distillation (5-40 bar). This dynamic approach allows the reaction conditions to be optimized for safety while the separation conditions are optimized for efficiency, achieving both goals without requiring the reaction itself to operate at high pressure.
3Ease of operation
If excessive compressor capacity is used to compress the entire gaseous stream, then all gases are compressed uniformly, but equipment size and cost increase
Solution Approach 1:
The patent extracts the liquid fraction (containing HF and HCl) from the total gaseous stream before compression. By taking out this liquid fraction that would otherwise require compression, the compressor only needs to handle the smaller gaseous fraction containing HFO-1234yf. This extraction principle dramatically reduces the required compressor size and capacity while still achieving the necessary pressure for distillation of the product-containing stream.
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 the fluorination reaction and product separation to be operated at independent pressures, simplifying the process by using pumps for liquid fractions and compressors for gaseous fractions, reducing equipment size and complexity, and minimizing the use of high-pressure equipment.
Implementation Method 1
cooling and partially condensing the gaseous stream obtained from the reaction
Implementation Method 2
distilling the compressed gaseous fraction and the compressed liquid fraction to give a 2,3,3,3-tetrafluoropropene stream, a hydrochloric acid stream, and a stream of unreacted hydrogen fluoride
Data Source
AI summary
The invention concerns a method for producing 2,3,3,3-tetrafluoropropene comprising: a fluoridation reaction of a halopropane and/or halopropene into 2,3,3,3-tetrafluoropropene by means of hydrogen fluoride; the recovery of a gas stream resulting from the reaction; the cooling and partial condensation of the gas stream resulting from the reaction into a partially condensed stream; the separation of the partially condensed stream into a gas fraction and a liquid fraction; the compression of the gas fraction into a compressed gas fraction; the compression of the liquid fraction into a compressed liquid fraction; the distillation of the compressed gas fraction and compressed liquid fraction in order to provide a stream of 2,3,3,3-tetrafluoropropene, a stream of hydrochloric acid, and a stream of unreacted hydrogen fluoride. The invention also concerns an installation suitable for implementing said method.