Analysis of liquefied gas
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I encountered a problem during the analysis: the propylene content in the liquefied gas taken from the device was 25%, but it dropped to 22% once it reached the spherical tank. This pattern persisted, even though it was the same machine being used. ? ? ?
Reply to 1# Inquirer: Testing the nitrogen in the spherical tank sample will show the answer.
Reply to 1# Inquirer: Also, what is the location of the sampling port? At the bottom, middle, and upper part of the spherical tank? Based on what the poster said, the sampling port should be at the lower part, right?
I. Principle of the method: A gas chromatograph equipped with a thermal conductivity detector is used to separate the various components of dimethyl ether and liquefied petroleum gas in the sample via a chromatographic column, and the content of dimethyl ether is calculated using the external standard method. II. Instruments and Materials 1. Gas chromatograph: Thermal conductivity detector, sensitivity ≥ 2000 mv.ml/mg (benzene). 2. Data processing: Computer and N2000 chromatography workstation. 3. Sample injector: Gas six-way valve, quantitation tube of 0.5–1 mL. 1 liquefied gas sampler. 4. Special chromatography column: stainless steel column with a diameter of 4×6 meters, coated with a mixed stationary phase on a 6201 support (60–80 mesh). III. Analysis steps: 1. Turn on the gas supply (hydrogen). 2. Connect the chromatography column, open the detector outlet, and adjust the flow control valve to set the carrier gas flow rate at 40 ml/min. 3. Power on the chromatograph, the computer, and the chromatography workstation, then proceed with the temperature-driven analysis. IV. Instrument Control 1. Analysis conditions: Column temperature: Room temperature to -40°C; Bridge current: 100A; Vaporization temperature: 80°C; Flow rate: 40 ml/min (0.18 MP); Detection temperature: 80°C; Injection volume: 1 mL. V. Quantification method: The content of dimethyl ether in the liquefied gas is quantified using the area external standard method. IV. The analysis spectrum is as follows: Dimethyl ether content (by mass) in liquefied gas: 2.92%. Dimethyl ether content (by mass) in liquefied gas: 14.52%℅
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