Method and apparatus for analyzing alkalinity conditions in aqueous liquids

摘要

Method for analyzing the alkalinity conditions in aqueous liquids, comprising: sampling a known amount of the aqueous liquid and placing it in a container of known volume, measuring pH in the sampled liquid and pressure in the container, adding a known amount of CO2 to the sampled liquid, and measuring pH in the sampled liquid and the pressure in the container, and finally calculating the total alkalinity based on the values from the performed measurements. An apparatus for conducting the method is also described as well as a method for controlling chemistry of a glycol containing liquid in a system for recovery of glycol.

主权项

1. A method for analyzing the alkalinity conditions in aqueous liquids, the method comprising:
I. sampling a known amount of the aqueous liquid and placing it in a container of known volume; II. measuring pH in the sampled liquid and the pressure in the container; III. adding a known amount of CO2 to the container; and IV. measuring pH in the sampled liquid and the pressure in the container; and V. calculating total alkalinity, wherein total alkalinity is calculated on the basis of measured pH and measured CO2 pressure according to the following equation:
Total alkalinity =K*pCO2/10−pH , where K is a constant defined by ambient temperature, measured pressure and ion concentration in the aqueous solution and the presence and concentration of other solvents, while pco2 is the difference between pressure in the container before and after CO2 addition.