GAS CHROMATOGRAPHIC METHOD OF DETERMINING MASS CONCENTRATION OF IMPURITIES IN NATURAL GAS Russian patent published in 2009 - IPC G01N30/08 

FIELD: physics; measurement.

SUBSTANCE: invention pertains to gas chromatographic analysis methods. A sample of natural gas is preselected. Impurities are concentrated on an absorbing sorbent and thermal desorption of the impurities into a chromatographic column is done. Preselection of the sample of natural gas is done by concentrating impurities of natural gas in a sorbent tube with activated silica gel KCK and valves. The sorbent tube is put into a heated thermal desorption unit with needles, through which the valves in the sorbent tube open, and desorbed impurities are eluated into the chromatographic column. The proposed method is realised using a chromatographic system of determining mass concentration of impurities in natural gas, consisting of gas chromatography, a chromatographic packed column, 10 dock crane-switches, evaporator, detector, aspirator and a sampling device. The sampling device contains a reservoir where the sorbent tube with valves is put at its ends and activated silica gel KCK. The device is provided with two needles, through which valves of the sorbent tube open when taking samples. The thermal desorption unit has two needles, through which valves of the sorbent tube open during analysis.

EFFECT: increased accuracy, as well as possibility of gas chromatographic determination of mass concentration of moisture and methanol impurities in natural gas.

8 cl, 5 dwg