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Method and apparatus for determining urea concentration
| Details |
Inventors: Tajiri, Yoshihiro; Hayabuchi, Takuya; Teramoto, Naohiro; Kojima, Yasuhiko; Sakata, Eiji; Morikawa, Haruyuki;
Assignee: Toyo Engineering Corporation (Tokyo, JP)
Primary Examiner: Soderquist; Arlen
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
A method for determining a urea concentration in an aqueous solution containing urea, includes: hydrolyzing the urea in the aqueous solution, measuring an electric conductivity .chi. of the aqueous solution, and determining the urea concentration in the aqueous solution from the electric conductivity .chi. using a correlation between the urea concentration and an electric conductivity. |
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DETAILED DESCRIPTION After intense investigation, the inventors have found that the above-identified problems may be solved by heating an aqueous solution containing urea under increased pressure, thereby hydrolyzing urea in the solution.
The urea concentration is then determined using the electric conductivity of the solution containing hydrolysis products including ammonia, which is proportional to the contents of solutes, such as ammonia.
The inventors have also found that when an aqueous solution to be measured contains a substance, such as ammonia, which may change electric conductivity, the above problems may be solved by measuring electric conductivity before and after hydrolysis of urea, respectively, and determining a urea concentration in the solution from the difference between these electric conductivities.
This invention provides a method for determining a urea concentration in an aqueous solution including hydrolyzing the urea in the aqueous solution, measuring an electric conductivity .
chi.
of the resulting aqueous solution, and determining the urea concentration in the aqueous solution from the electric conductivity .
chi.
using a correlation between a urea concentration and an electric conductivity.
In this method, it is preferable to continuously conduct sampling of the aqueous solution, hydrolysis of urea in the aqueous solution, and measurement of the electric conductivity .
chi.
to continuously determine a urea concentration in the aqueous solution.
This invention also provides a method for determining a urea concentration in an aqueous solution containing urea, including measuring an electric conductivity .
chi.
' in the aqueous solution, then hydrolyzing urea in the aqueous solution, then measuring an electric conductivity .
chi.
in the resulting aqueous solution, and determining a urea concentration in the aqueous solution from the difference between the electric conductivities .
chi.
and .
chi.
' using a correlation between a urea concentration and an electric conductivity
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Control Computers 
