paraffin wax deposition and fouling

— A91 —
parafi’in w, it was assumed to be composed entirely of one ncraal :araffin.
The
chain length and heat of fusion of this normal paraffin were obtained
(26) 0
rom Natnan . $or a normal paraffin with the melting point of 525 C,
the chain length was estimated to be
25, corresponding to a molecular
weight of 352 and a latent heat of fusion of 18.88 kcal/mole.
The average molecular weight of the kerosene was obteined from
4)
erne_iicn and wori2
by assuming it to be ãfl aliphatic hydrocarbon
solvent. A solvent with a boiling point corresponding to kerosene, the
molecular weight was estimated to be 53.
Table A2.1 shows the calculated theoretical solubility, expressed
as per cent WaX
in solution.
The experimental solubility given in Appendix I
and the empirical
and theoretical solubilities calculated here, are plotted in fig A2.i -
The capirical and theoretical solubility curves are similar in shape,
tac foraer consistently preaictng aigaer saturation coacentratjons, a;
at given temperature.
-s tae souzion temperature rises, tne iz:erence
tac ompirca ana tneore;icaj curves rses.
The exerimental curve is fairly close to the empirical curve at
low concentrations but then approaches and crosses the theoretical
curve.
It is n;erestng to note how ciose the experizen;a ana
;neore;cal curves are at aiga concentrations..
This 15 contrary to
what was expected because iea.ty c.ecreases wtri increasec. concentration.
It was considered that the similarity in the shape of the empirical
and theoretical curves, indicated that the solvents used by 2crne—Allen
and ork(2 were purer ana c’oser to eali;y taan tao commarcian graae
used in the present work.
The difference in the empirica. ana
theoretical curves could be due to errors involving the assumptions
rocua: to ootann ta. neat o :n.iioa 0: ae paran wX.
As anscu&ioa n section 2.p ana saown in fig. 2.2...,
rate affects ;ne cloud point oe;roleum waxes in hNdrooarbon solvents.