paraffin wax deposition and fouling

2.2.3 Solubility
refined paraffin waxes in petroleum fractions. The waxes used had
thus reduce the surface tonsion whida moans that tho system is loss
Berne-Allen and Work
likely to form strong structural network.
that resins and nsphaltcnos are adsorbed on paraffin crystals and.
1 did extensive work on solubility of
loading to the deproesion of the pour point. llafikov at al stated
carbon sclvants includins crude oil, could be ccL.clated aatisac;cri:j.
heat of fascn of the wax. Nathan found that solubiIites n hydro—
tore x is the zale fraction, 2r the as constant and &, the latent
- s1: -
.:.n x = — — ..... 2.2.5.2,
the ideal solubilty relation
petroletm rod waxes and had nelting points from 76 to 92°C. Zsins
weijht waxes in a number of solvents. Zae waxes were obtained from
26) stu&ied the solubility of purified high zolecular
tozorap2 of the above equation.
values was found to be about 5 oer cent. Davis has presented a
point. e avera;e deviation of calculated values fran experir.ettal
ten the solution temperature 2 is within 10°C of the wax melting
from 60 to 300°C for wax melting points Cc
3,) from 45 to 7C°C and
of solvent. Vhis equation holds good for solvent bo±ling points (.
ae concentration is expressed as rams of wax dissolved in ‘100 ml
(2.2.3..,
aS
c = [1120 — 2.97 I.1357
points of waxes and average boiling points of solvents.
developed to express paraffin wax solubility in terms of melting
solubilities in the various petroleum fractions. A relation was
The cloud point method was employed to determine the paraffin wax
basically normal hydrocarbons with boiling points from ‘150 to 490°C.
melting points from 50 to 65°C and the petroleum fractions used wore
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