Azeotropic 1233zd(Z) and HF Separation
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Solution Overview
Problem
Current methods for producing (Z)-1-chloro-3,3,3-trifluoropropene (1233zd(Z)) lack an efficient intermediate step for purification and separation, which is crucial for its use as a non-toxic, zero ozone-depleting chlorofluorocarbon in various applications.
Innovation Solution
The formation of an azeotropic or azeotrope-like composition of 1233zd(Z) and hydrogen fluoride (HF) allows for effective separation and use as an intermediate, solvent, and for removing surface oxidation from metals, utilizing extraction or distillation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional production methods are used to produce 1233zd(Z), then the compound can be obtained, but efficient purification and separation intermediate steps are lacking
Solution Approach 1:
The patent introduces an azeotropic mixture of 1233zd(Z) and hydrogen fluoride as an intermediate substance in the production process. This intermediate facilitates efficient separation and purification of 1233zd(Z) from reaction mixtures, solving the purification efficiency problem while maintaining reasonable process complexity through well-established azeotropic distillation techniques.
2Manufacturing precision
If azeotropic composition of 1233zd(Z) and HF is formed for separation, then purification efficiency is improved, but additional separation steps are required
Solution Approach 1:
The patent utilizes the phase transition properties of the 1233zd(Z)-HF azeotropic mixture, specifically its constant boiling point behavior, to enable efficient separation. By forming the azeotrope and then using extractive distillation or scrubbing operations, the mixture undergoes phase changes that facilitate separation of 1233zd(Z) from impurities, achieving high purification efficiency through controlled phase transitions.
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 production of substantially pure 1233zd(Z) with reduced environmental impact, suitable for use in blowing agents, refrigerants, and other applications, while minimizing ozone depletion.
Implementation Method 1
an azeotropic or azeotrope-like composition of (Z)-1-chloro-3,3,3-trifluoropropene and hydrogen fluoride
Implementation Method 2
separated into its component parts by extraction or distillation techniques
Implementation Method 3
compositions for removing surface oxidation from metals
Data Source
AI summary
Disclosed are azeotropic and azeotrope-like mixtures of (Z)-1-chloro-3,3,3-trifluoropropene (1233zd(Z)) and hydrogen fluoride. Such compositions are useful as an intermediate in the production of 1233zd(Z). The latter compound is useful as a nontoxic, zero ozone depleting fluorocarbon useful as a solvent, blowing agent, refrigerant, cleaning agent, aerosol propellant, heat transfer medium, dielectric, fire extinguishing composition and power cycle working fluid.