240fa-HF Azeotropic Composition for Stable Fluorination Intermediates
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Solution Overview
Problem
The use of hydrofluorocarbons like HFC-245fa contributes to global warming, necessitating the development of more environmentally friendly substitutes, and existing production processes require an efficient intermediate for producing HFC-245fa and HCFO-1233zd, which is an azeotropic or azeotrope-like mixture of 1,1,1,3,3-pentachloropropane (240fa) and hydrogen fluoride (HF).
Innovation Solution
Azeotropic or azeotrope-like compositions of 1,1,1,3,3-pentachloropropane (240fa) and hydrogen fluoride (HF) are formed, with specific weight percent ratios, exhibiting a boiling point range of 24° C. to 60° C. at pressures of 17.8 to 55.4 psia, suitable as intermediates in production and as solvent compositions for metal surface oxidation removal, and can be separated using extraction or distillation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If HFC-245fa is used as a substitute for CFCs, then environmental friendliness is improved, but contribution to global warming increases
Solution Approach 1:
The invention changes the chemical composition parameters by using 1,1,1,3,3-pentachloropropane (240fa) as a reactant to produce HCFO-1233zd, which has different greenhouse gas properties compared to HFC-245fa. This parameter change in chemical structure and composition allows achieving both ozone protection and reduced global warming impact
Solution Approach 2:
The invention uses an azeotropic intermediate mixture of 240fa and HF as a mediator in the production process. This intermediate facilitates the transformation from 240fa to HCFO-1233zd, enabling the production of environmentally superior refrigerants while managing the environmental trade-offs of intermediate substances
2Productivity
If an azeotropic intermediate of 240fa and HF is used in production, then production efficiency of HFC-245fa and HCFO-1233zd is improved, but separation difficulty increases due to azeotropic properties
Solution Approach 1:
The invention performs preliminary action by forming the azeotropic mixture of 240fa and HF before the main reaction. This pre-formed intermediate is then used as a reactant system, improving production efficiency by establishing optimal reaction conditions beforehand, while the azeotropic nature simplifies the subsequent separation steps
Solution Approach 2:
The invention exploits phase transition properties of the azeotropic mixture to facilitate separation. By utilizing the specific boiling point and phase behavior of the 240fa-HF azeotrope, the process enables efficient separation of components through distillation or phase separation techniques, reducing the complexity of the overall separation process
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 azeotropic compositions effectively serve as intermediates in the production of HFC-245fa and HCFO-1233zd, offering a stable boiling point and non-fractionation during boiling, facilitating efficient separation and utilization in industrial applications, while reducing environmental impact.
Implementation Method 1
an azeotropic or azeotrope-like mixture of 1,1,1,3,3-pentachloropropane (240fa) and hydrogen fluoride (HF)
Implementation Method 2
This intermediate, once formed, may thereafter be separated into its component parts, for example, by extraction or distillation techniques
Data Source
AI summary
Provided are azeotropic or azeotrope-like mixtures of 1,1,1,3,3-pentachloro-propane (240fa) and hydrogen fluoride. Such compositions are useful as an intermediate in the production of HFC-245fa and HCFO-1233zd.