paraffin wax deposition and fouling
paraffin wax deposition and fouling
paraffin wax deposition and fouling
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13<br />
remain in solution <strong>and</strong> the plate temperature varied from LF to 3200.<br />
The amount of raraffin derozited was determined by removing the<br />
copuer :)late <strong>and</strong> v:eig’nin it. The<br />
temperature difference between<br />
the cloud roint <strong>and</strong> the plate temperature was considered most<br />
important in controlling the accumulation. It was found that the<br />
Paraffin deposit contained 8 per cent kerosene. The <strong>paraffin</strong> was in<br />
crystalline form,<br />
but the retained kerosene was enough to maie its<br />
consistency that of a heavy paste.<br />
The experimental results showed<br />
that deuosition increased with increasing temperature differential.<br />
See fig. 2.3.2.1.<br />
Further experiments by Cole <strong>and</strong> Jessen showed<br />
that the initial rate of <strong>deposition</strong> increased with increasing<br />
tem-cerature differential.<br />
The cnange ifl rate o: parazzin aenosation<br />
was attributed to the thermal insulation by the deposited <strong>wax</strong> layer<br />
<strong>and</strong> the variation in the amount of <strong>paraffin</strong> available for <strong>deposition</strong>,<br />
per degree temperature differential, since the rate of change in<br />
<strong>paraffin</strong> solubility with temperature is much greater just below<br />
the cloud roin; than it is for lower temperatures.<br />
Jorda’ 2 studied <strong>paraffin</strong> <strong>deposition</strong> <strong>and</strong> its prevention, jn<br />
a modified version of the cold spot tester developed by gun;’<br />
The apparatus consisted of a flat circular plate mounted on a curved<br />
tube <strong>and</strong> positioned in a vessel containing a <strong>wax</strong>—oil solution.<br />
The<br />
apparatus was arranged such that the temperature of the central<br />
uor;ion 0: trie circaar pate coulo. cc varien oy means oz a crcua;—<br />
trig :qutd stream,<br />
The souutton was maintatnec. at a constant<br />
tenrerature <strong>and</strong> stirred wtth a magnettc st:rrer.<br />
PIe scuu;cn usec.<br />
in the experiments consited of a 25 weight rer cent refined petroleum<br />
<strong>wax</strong> in a refined petroleum solvent. The cloud cia; of the<br />
sollticn as 36°C.<br />
The olution temperature was at all times lea:<br />
L,.<br />
aria the stirring areec. at 300 r.r.m. resa sc_u;ioas were<br />
used for each ;es, which lasted 16 hours, Paraffin was de:ooited<br />
a; coTh oro; to:rDera;ures 2, 4, 6, 8 <strong>and</strong> 10°C below the solltior.
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