Fluorine-Treated Plastic Packing for Improved Column Wettability
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Solution Overview
Problem
Packed columns with plastic packings are inefficient due to incomplete wetting by aqueous solutions, limiting mass transfer and heat exchange efficiency, as the mass transfer only occurs on the wetted surface.
Innovation Solution
A method involving exposure of the plastic surface in a packed column to a treatment gas containing fluorine, which increases the surface tension and wettability, allowing complete wetting and enhancing the mass transfer properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If plastic packing is used to increase surface area, then the surface area is increased, but the wettability is insufficient limiting mass transfer efficiency
Solution Approach 1:
The invention changes the chemical composition of the packing surface by introducing fluorine atoms through treatment with fluorine-containing gas. This chemical modification transforms the surface properties, increasing surface tension from 30 mN/m to 40-70 mN/m, thereby improving wettability while preserving the high surface area characteristic of plastic packings.
Solution Approach 2:
The invention creates a composite surface structure where fluorine-containing groups are introduced onto the plastic packing surface. This forms a composite material system combining the base plastic structure with fluorine functional groups, achieving both high surface area and improved wettability simultaneously.
2Reliability
If fluorine treatment is applied to increase wettability, then the surface tension increases, but the treatment complexity increases
Solution Approach 1:
The invention replaces complex multi-step surface treatment mechanisms with a simplified gas-phase fluorine treatment process. Instead of using liquid chemicals or plasma equipment, the method uses fluorine-containing gas that can be directly introduced into the packing column, significantly reducing treatment system complexity.
Solution Approach 2:
The fluorine-containing gas treatment process is designed to be self-regulating, where the gas naturally distributes throughout the packing structure and treatment continues automatically as long as gas flow is maintained. The process parameters (temperature, pressure, gas composition) can be controlled within ranges that automatically achieve the desired surface tension increase without requiring precise optimization.
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 method improves the wettability of the plastic surface, increasing the effective surface area for mass transfer and enhancing the efficiency of the packed column by increasing the surface tension from 30 mN/m to 40 mN/m to 70 mN/m, thereby improving material and heat exchange properties.
Implementation Method 1
increases the surface tension and wettability, allowing complete wetting and enhancing the mass transfer properties
Implementation Method 2
improves the wettability of the plastic surface, increasing the effective surface area for mass transfer
Implementation Method 3
The air as the first starting material is brought into contact with a washing liquid as the second starting material. The air is introduced into the packed column in a lower region called the sump. The scrubbing liquid is introduced into an upper portion of the packed column. The sinking liquid comes into contact with the rising air, with the washing liquid absorbing pollutants in the air.
Implementation Method 4
A measure of the mass transfer properties of the packing is therefore its ratio of surface area to volume. This ratio can be, for example, in the range of 350 m2/m3
Data Source
Figure 1~2
AI summary
Treating at least one component (1) of a packed column having a portion made of plastic, in which a region having a surface area of a portion, forms at least one portion of a surface (2) of the component, comprises contacting the surface having at least one portion of the plastic with a treating gas in a processing chamber for a treatment period, where the treating gas comprises fluorine. An independent claim is also included for the component of the packed column having the portion made of plastic, where the region having a surface region forms at least one portion of the surface of the component and at least one portion of the surface region includes a fluoropolymer, or exhibits a surface tension of greater than 45 mN/m.