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http://dx.doi.org/10.7842/kigas.2021.25.4.48

Development of Primary Reference Gas Mixtures for Liquid Propane  

Jeong, Yun-sung (Gas Metrology Group, Korea Research Institute of Standards and Science (KRISS))
Kim, Jin-seog (Gas Metrology Group, Korea Research Institute of Standards and Science (KRISS))
Bae, Hyun-kil (Gas Metrology Group, Korea Research Institute of Standards and Science (KRISS))
Kang, Ji-hwan (Gas Metrology Group, Korea Research Institute of Standards and Science (KRISS))
Lee, Seung-ho (Dept. of chemistry, Hannam University)
Kim, Yong-doo (Gas Metrology Group, Korea Research Institute of Standards and Science (KRISS))
Publication Information
Journal of the Korean Institute of Gas / v.25, no.4, 2021 , pp. 49-56 More about this Journal
Abstract
Liquefied Petroleum Gas is divided into liquefied gases containing propane (C3H8) and butane (C4H10). The quality of LPG varies greatly depending on the composition of the mixture, so it is important to measure the composition accurately. It is difficult to determine the composition of the mixture because liquid and gas coexist at room temperature. Therefore, the uncertainty in determining the concentration of hydrocarbons by component is high, and there are many problems that differ from the actual content standard. Therefore, it is necessary to develop a mixed liquid propane standard gas for the composition and accurate concentration of hydrocarbon substances. Mixed liquid propane standard gas is manufactured into bellows-type constant-pressure cylinders by ISO-6142 (2015). The homogeneity of the four standard gases manufactured was confirmed to be GC-FID. The manufacturer's uncertainty of expansion was 0.01 % to 0.30 % and homogeneity was 0.03 % to 0.25 %. In this mixed liquid propane standard gas, the relative expansion uncertainty of weight method, manufacturing consistency, cylinder adsorption and long-term stability was developed within 0.26 %-1.3 9% (95% of confidence level, k=2).
Keywords
liquefied petroleum gas; adsorption; uncertainty; stability; consistency;
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