Vinylidene Fluoride Purification Using Zeolite 4A Adsorption
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Solution Overview
Problem
Existing methods struggle to efficiently purify vinylidene fluoride (VdF) as a main component due to its similar boiling point with trifluoromethane (R23), leading to impurities inhibiting polymerization reactions.
Innovation Solution
A method involving the use of synthetic zeolite 4A to contact a fluid containing VdF and R23, optimizing the mass ratio of VdF to R23, and controlling flow rates and contact conditions to achieve high-purity VdF.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional purification methods are used, then the process is simple, but the purity of VdF cannot be sufficiently increased due to similar boiling points with R23
Solution Approach 1:
The patent changes the purification approach from thermal separation (distillation) to adsorption-based separation. By using synthetic zeolite 4A with specific pore size (3.8-4.0 Å), the method exploits differences in molecular size and shape between VdF and R23, allowing selective adsorption of R23 while permitting VdF to pass through, thereby achieving high purity without complex thermal processes
Solution Approach 2:
The patent employs synthetic zeolite 4A, a porous aluminosilicate material with controlled pore dimensions (3.8-4.0 Å). The porous structure provides selective permeability based on molecular size, allowing the material to differentiate between VdF molecules (which can pass through) and R23 molecules (which are adsorbed due to their size and shape characteristics),从而实现高效分离
2Productivity
If R23 impurity is present in VdF, then the composition is easier to obtain, but polymerization reaction is inhibited
Solution Approach 1:
The patent extracts and removes the harmful R23 impurity from the VdF composition using synthetic zeolite 4A. The zeolite selectively adsorbs R23 molecules while allowing VdF to pass through, effectively separating the impurity from the main product and enabling high-purity VdF to proceed with polymerization reactions without inhibition
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
High-purity VdF is obtained with a mass ratio of 99% or more, effectively removing R23 impurities, thereby enhancing polymerization reaction efficiency.
Implementation Method 1
contacting a first fluid including VdF as a main component and further including trifluoromethane with a synthetic zeolite 4A
Implementation Method 2
a synthetic zeolite 4A... mass ratio of a content of VdF to a total content of the VdF and trifluoromethane
Data Source
AI summary
A method of purifying vinylidene fluoride is provided. The method comprising: contacting a first fluid including vinylidene fluoride as a main component and further including trifluoromethane with a synthetic zeolite 4A, obtaining a second fluid in which the mass ratio of the content of vinylidene fluoride to the total content of the vinylidene fluoride and trifluoromethane is higher than the mass ratio of the content of the vinylidene fluoride to the total content of the vinylidene fluoride and the trifluoromethane in the first fluid.