FTIR Gas Analyzer for Beverage Grade CO2 Impurity Detection
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Solution Overview
Problem
Existing methods for analyzing impurities in carbon dioxide gas, such as gas chromatography and mass spectrometry, are either slow, prone to cross interferences, or require extensive maintenance, and often provide limited information, necessitating the need for complex and costly multi-instrument setups.
Innovation Solution
A Fourier Transform Infrared (FTIR) gas analysis system with a wide-range detector, an oxidizer module for converting reduced sulfur to SO2, and a multiplexer for selecting multiple gas samples, allowing for comprehensive impurity detection in a single instrument with simplified protocols and reduced calibration requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas chromatography with photoionization detection and flame ionization detection is used to analyze impurities in CO2 gas, then measurement precision is improved, but productivity deteriorates due to slow analysis speed requiring several minutes between samples
Solution Approach 1:
The patent replaces the mechanical separation system of gas chromatography with a direct infrared absorption measurement system. The FTIR spectrometer directly measures impurity concentrations through infrared absorption spectra without requiring physical separation, eliminating the slow chromatographic process while maintaining detection precision through spectral analysis of multiple impurities simultaneously.
Solution Approach 2:
The FTIR spectrometer serves multiple detection functions simultaneously, measuring various impurities (sulfur compounds, hydrocarbons, carbon oxides, etc.) in a single analysis run. This multi-functional approach replaces the need for multiple specialized detectors (PID, FID) required in chromatographic systems, improving both productivity and comprehensive impurity analysis capability.
2Productivity
If mass spectrometry is used for fast impurity detection, then productivity is improved with fast analysis, but measurement precision deteriorates due to cross interferences and calibration issues requiring continued maintenance
Solution Approach 1:
The patent replaces the mass spectrometry ionization and mass separation mechanism with infrared absorption spectroscopy. This substitution eliminates cross-interference issues inherent in mass spectrometry where different compounds with similar mass-to-charge ratios cause detection errors. The FTIR system achieves superior measurement precision by detecting impurities through their unique infrared absorption spectral fingerprints, which are less prone to cross-interference.
3Measurement precision
If multiple specialized instruments are combined to detect various contaminants, then measurement precision is improved for specific impurities, but device complexity increases resulting in complicated designs, cumbersome calibrations and extensive maintenance
Solution Approach 1:
The patent merges the functions of multiple specialized detection instruments into a single FTIR spectrometer system. Instead of combining separate PID, FID, and other specialized detectors, the FTIR instrument integrates the capability to detect sulfur compounds, hydrocarbons, carbon oxides, and other impurities through its broad spectral range, simplifying the overall system design while maintaining comprehensive detection precision.
Solution Approach 2:
The FTIR spectrometer provides universal detection capability for multiple impurity types simultaneously, eliminating the need for multiple specialized instruments. The single instrument performs comprehensive impurity analysis that would otherwise require several different detection systems, thereby reducing device complexity, calibration burden, and maintenance requirements while preserving measurement precision across all detected contaminants.
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 system enables fast, sensitive detection of multiple impurities at parts per million or parts per billion levels, including sulfur-based compounds, with minimal maintenance and calibration, providing accurate CO2 percentage measurements and simultaneous readings for various contaminants, achieving lower detection limits and streamlined operations.
Implementation Method 1
the invention relies on infrared absorption analysis such as Fourier transform infrared (FTIR) gas analysis to measure impurities
Implementation Method 2
an oxidizer module for converting reduced sulfur to SO2
Implementation Method 3
the oxidizer includes a furnace that can be operated at a temperature sufficient to carry out the oxidation reaction(s), e.g., about 1,000° C.
Data Source
AI summary
A system and method for determining impurities in a beverage grade gas such as CO2 or N2 relies on FTIR gas analysis for measuring non-sulfur impurities as well as SO2. CO2% also can be determined. A multiplexer selects a sample gas from multiple gas samples. Conversion of reduced sulphur present in some impurities to SO2 is conducted in an oxidizing furnace. Climate control and measurements of oxygen gas impurities also can be provided.