200
PETROLEUM SPECIALTY PRODUCTS
TABLE 10-11 Solvent Dewaxing of Lube Base Stocks Operating Conditions
Feed: Ex waxy asian crude
Cut, ⬚F
Density
Viscosity, cSt, 210⬚F
Pour point, ⬚F
Wax content, Wt %
840–915
0.8585
5.81
134.6
69
MEK + BZ + TOL
MIBK + BZ + TOL
MIBK
5/1
30
30
40
5/1
100
5/1
1.0
1.0
1.0
1.0
1.0
1.0
1.5
1.5
5.0
1.5
1.5
5.0
1.5
1.5
5.0
⬚F/min
⬚F/min
⬚F
V/V
2.5
1
–13
1.5/1
2.5
1
–13
1.5/1
3
<0.5
–13
1.5/1
Wt %
⬚F
cSt, 210⬚F
32.2
24.8
11
61
23.7
26.6
11.4
67
27.4
6.8
12.1
58
Wt %
⬚F
⬚F
67.8
144.5
37.8
73.9
138.56
39.6
72.6
135.5
19.8
Solvents
Solvent composition:
Methyl ethyl ketone
Benzene
Toluene
MIBK
Solvent-to-feed ratio
Solvent addition temperatures
Total solvent-to-feed ratio
Average chilling rate
Between 158 and 132⬚F
Below 32⬚F
Dewaxing temperature
Wash solvent-to-feed ratio
Dewaxed oil
Yield
Pour point
Kinematic viscosity
Viscosity index
Slack wax
Yield
Conjgealing temperature
Delta T (dewaxing temp-pour point)
Vol %
40
30
30
⬚F
158
96.8
32
–7.6
–13
BZ = benzene; MEK = methyl ethyl ketone; MIBK = methyl isobutyl ketone; TOL = toluene.
TABLE 10-12 Solvent Dewaxing Operating Conditions
Feed: Bright neutral Aghajari crude
Solvent-to-feed ratio, V/V
SDA dosing, ppm
Chiller outlet temperature, ⬚F
Filter feed drum temperature, ⬚F
Cold wash-to-feed ratio
Cold wash temperature, ⬚F
Solvent composition
Methyl ethyl ketone, Vol %
Toluene, Vol %
Viscosity of dewaxed oil, cSt, 210⬚F
VI of dewaxed oil
Pour point of dewaxed oil, ⬚F
Flash point of wax, ⬚F
4.00
200
6.8
8.6
1.00
–0.4
50
50
35
93
23
424