Method for analyzing the liquefied petroleum gas and device thereof

A device for analyzing a liquefied petroleum gas, comprising:

• an inlet receiving a sample of the liquefied petroleum gas, the sample of the liquefied petroleum gas comprises a main component group, and the main component group comprises a plurality of sub component groups;
• a multiposition valve, comprising an inlet end, a first outlet end, and a second outlet end, and the inlet end connecting to the inlet;
• a first column connecting to the first outlet end;
• a second column connecting to the second outlet end, and the second column including different separation ability from the first column;
• an analyzing apparatus connecting to the first column and the second column, and the analyzing apparatus exports a first measured total hydrocarbon and a second measured total hydrocarbon, the first measured total hydrocarbon corresponds to the main component group, and the second measured total hydrocarbon corresponds to one of the plurality of sub component groups;
• and
• a computing unit configured for obtaining a regressed total hydrocarbon according to the second measured total hydrocarbon and obtaining an analyzing result of total hydrocarbon according to the first measured total hydrocarbon, the regressed total hydrocarbon, and a predetermined range of total hydrocarbon;
• wherein, a predetermined relationship of total hydrocarbon and the predetermined range of total hydrocarbon are based on regression analysis of total hydrocarbon of a plurality of reference samples of the liquefied petroleum gas, the predetermined relationship of total hydrocarbon is a function of regression analysis, a plurality of variables in the function of regression analysis represent ratios of the second measured total hydrocarbon of one of the plurality of sub component groups to a summation of all the second measured total hydrocarbon of the plurality of sub component groups, and the regressed total hydrocarbon is an unknown number of the function of regression analysis, the predetermined range of total hydrocarbon is a range of a ratio of the first measured total hydrocarbon to the regressed total hydrocarbon.