Annual Report (FY 1969): Freeport Test Facility and Vertical-Tube-Evaporator Test-Bed Plant, Freeport, Texas Page: 30
viii, 128 : graphs, ill., tablesView a full description of this report.
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SECTION II
TECHNICAL EVALUATION
OBJECTIVE 4. - I)EAi EIATOR-DECA IUONATR()I (CONTD)
d. Dissolved Oxygen
1) The dissolved oxygen content of the deaerator unadjusted outlet
brine was above 50 ppb for the first part of Run 15. After several
leaks in the deaerator were repaired, the dissolved oxygen of the
deaerated brine dropped to between 30 and 50 ppb for the remainder
of the run.
During Development Run 16, most dissolved oxygen determinations were
run as part of the sub-objective of sulfite addition; the results of
which are discussed in the next section.
e. Sulfite Addition
1) Background
The economics of chemical scavenging of the residual dissolved oxygen
was studied. Assuming the addition of 10 parts of sodium sulfite
per part of oxygen at a cost of 20 per pound for the sodium sulfite,
the cost of sulfite addition in VTE plants with high extraction
ratios would not be much more than 0.2 per 1000 gallons of product
water, based on deaerator effluent dissolved oxygen scavenging only.
Scavenging of subsequent inleakage might raise the cost significantly.
2) Analytical Problems
During Run 16, sodium sulfite was injected into deaerator effluent
in an attempt to study the effects of sulfite as an oxygen scavenger
in a seawater environment. A sulfite residual of 0.1 to 0.2 ppm was
chosen as a control point. A suitable analytical method was required
which would be usable to detect these low sulfite residuals. Since
most of the published sulfite methods are for higher levels of sulfite,
it was necessary to modify these methods to suit the test requirements.
A method was developed that is considered good to + 0.2 ppm as Na2SO3.
Note that since it takes at least an hour to take the sample and run
the analysis, the observed sulfite residual may be low due to reaction
during sampling and analytical time.
3) Injection Point Plugging
During the first part of the run, the sodium sulfite solutions were
made up at the strength recommended by the manufacturer. However,
plugging of the injection point occurred necessitating cleaning at
least once per shift. It was assumed that the plugging was due to
the precipitation of calcium sulfite, which is extremely insoluble,
at the injection point. Experiments with different injection point-30-
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Campbell, Keith S. & Williams, Donald L. Annual Report (FY 1969): Freeport Test Facility and Vertical-Tube-Evaporator Test-Bed Plant, Freeport, Texas, report, 1969; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc11743/m1/37/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.