HEAT OF DILUTION CALCULATION FOR 19 MOLAR SODIUM HYDROXIDE WITH WATER FOR USE IN 241-S-112 Page: 4 of 10
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Page 5 of 11 of flA4432654
RPP-CALC-32668 Page 3 of
Rev. 0
Title: Heat of Dilution Calculation for 19 Molar Sodium 1-vdroxidc with Water for Use
in 241-S-112
Originator: W. B. Barton Date: 2//2 7
Checker: V. 8_ Anda Date:
Organizational Manager: M. J. Sutev Date:
Purpose
It is planned to put caustic solution into S-1 12 to use as a dense carrier fluid to help
retrieve the solids from the tank. The caustic will also provide the needed corrosion
inhibiting chemical in SY-102, the receiver tank for the transfer. This calculation will
establish a safe envelope of concentration vs. temperature for the caustic in S-112 to
ensure that stress corrosion cracking will not occur in the tank liner. NACE international
has issued Standard Recommended Practice, RP0403-2003 Item No. 21102, Avoiding
Caustic Stress Corrosion Cracking ofCarbon Steel Refinery Equipweni and Piping
(NACE. 2003). This practice establishes recommended conditions to store caustic in
non-stress relieved carbon steel piping and vessels and will be used as the bounding
acceptable condition.
Problem Statement
Find the maximum caustic soda solution concentration (50 ,x % or less) for which
acceptable conditions of temperature and concentration can be defined to remain within
the NACE criteria for a non-stress relieved carbon steel vessel assuming the caustic may
be diluted with water while in the vessel.
Input Data
The site raw water temperature is currently -40 F and experiences an annual variation
from 38 to 65 0F. This establishes a minimum temperature that water can be added to
the caustic soda solution. A water heater is available that can heat the water to any
desired temperature below 180 "F. The calculation will establish the maximum
temperature for water.
Tank S-112 waste currently has a temperature of about 62 0F. (PCSACS).
Standard commercial concentrations of caustic soda are 25 and 50 weight o solutions.
Other concentrations can be purchased at additional cost. 25 weight % caustic freezes at
-4 F (-200 C) and 50 weight % caustic freezes at about 54 F (12 "C). These establish
minimum temperatures for the caustic solution. In practice because of the high viscosity
of caustic soda solution near freezing the practical minimum temperature is at least 10 0F.
above these temperatures.
Caustic and caustk soda are common names used for sodium hydroxide. In this document all three names
will be used interchangeably.
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Barton, W. B. HEAT OF DILUTION CALCULATION FOR 19 MOLAR SODIUM HYDROXIDE WITH WATER FOR USE IN 241-S-112, report, February 20, 2007; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc888038/m1/4/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.