paraffin wax deposition and fouling

difficult to rub off as tii depocition tine was increased indicating
a cru;alliac a cure. r:ie amount of adrerent do;osit ‘.‘ias observc(1
to sabilioc afuor aooro:aLuaioly one hour.
Penton and oasaa used the cold soot test sevelo;ed r
::um0) to study paraffin deosition.
The solution they used :as
a 10 e1’ cent weight Cit—don fI vien e iibining :ncrocrys;allinc
properties, with a melting poin; of 72°C,
in a Soltron 170 solvent
with the boiling range 218—238°C. The solution cloud point
- - - - - - _o -
. C con iii a ne e::serameons tne scluaon vias Lept a; o C acove
the cloud point, that is at 55°C.
Among variables invesuigated
were ;ine, temperature and rate of stirring. in fig. 2.5.3.5
amount aeposi;ed is shown as a function of tine at 3
differen; rates
of stirring.
Ii: fig. 2.3.5.4 amount daposi;e& is ohovsa as a func;ion
of time at different tenrerature differences between the solu;ioi:
cloud point and uhe surface tempera;ure.
Phe results shorn in
these fig-ures may be
stated as follows:
2eeos; v,’eight decreased vr;h increased s;irring ra;e;
de:csit
weight increased as uhe te:ererature differen;ial be;weem inc
sonu;aon c_ou& roam; ann tue probe face temperamire was amcreasea;
ne-coo;; weagn; ancreasec. rariony :or ;ne cars;
;o 4 nouns
end then increased at a much slower rate.
2.3.4. S;rfEoe P:-oertues
- - - (50) - -,
essen ama ao’•,7e s;a;ea ama; amas;ac coa;ec. ronenmec
reoucec. c.ra::ari aerosatson. fac reccnc;zon was reamue; ;o u.n
v;etcabili;j by inc crude oil or sointion.
:igh neting psin;
naraffin c;u::es we; a pipe surface to a lesser degree then
av/
ncr_;;ng roamt waxes n-i so_u;:on. i .ow con;ac; ong_e means a
:ree sur:acc energy one more ve;;aag,
1
c.e::onstrated that the presence of co:’;ain aissubec.
en a :n;c surface would reduce the adherence of nmadfin