| 摘要 |
FIELD: analytical methods. ^ SUBSTANCE: invention relates to automated determination of solution concentrations, in particular from measured boiling temperature, and can be used in natural gas fields and in underground gas holders on gas absorption drying installations, wherein aqueous solution of di- or triethylene glycol is used as absorbent. Concentration of aqueous glycol solution comprises measurement of boiling point and vapor phase pressure over boiling solution. Sought concentration is calculated from following relationships: (1) Cg=Mg*Xg*100/(Mg+Xg+Mw*(1-Xg)), where Xg=(10Zw(T)-P)/(10Zw(T)-10Zg(T); (2) Zw(T)=8.006-1691/(230+T); (3) Xg(T)=9.270-3035/(230+T) for diethylene glycol; (4) Xg(T)=8.54-2927.5/(230+T) for triethylene glycol; where Zw(T) is exponent value in determination of saturated water vapor pressure, Zg(T) is exponent value in determination of saturated glycol vapor pressure, Mw=18 kg/kmole (molecular mass of water), Mg is molecular mass of glycol, Mg=106 kg/kmole for diethylene glycol, Mg=150.17 kg/kmole for triethylene glycol, T is boiling temperature of glycol solution, °C, P is pressure of vapor phase over boiling solution, kg/cm2. ^ EFFECT: increased determination accuracy. ^ 1 dwg |
