Because the production process of Sasol Wax Liquid Paraffins is totally synthetic, unique normal alkanes having low aromatic contents, negligible sulfur levels and which are practically odourless and colourless, are produced. These unique properties enable us to offer a range of superior environmentally friendly products which sets them apart from the liquid paraffins derived from crude origin.
Our aliphatic SSX range is approved for use as metal extraction diluents for cobalt, nickel, copper, gold and zinc solvent extraction (SX) circuits. Importantly, our aliphatic diluents have proved to be the preferred diluent for the extraction of cobalt (Co) or for circuits which contain significant amounts of cobalt and nickel (Ni) making them susceptible to diluent oxidation.
Diluent oxidation causes the introduction of carboxylic acids and the formation of sodium carboxylates into the organic phase. The presence of carboxylic acids causes a significant fall-off in the Co/Ni separation factor. Sodium carboxylates interferes with the phase break causing drastic deterioration over time which eventually results in the failure of the circuit. Diluent oxidation in the absence of an anti-oxidant is very much faster for an aromatic diluent than for an aliphatic diluent. Therefore, aliphatic SX diluents are the preferred diluents in SX circuits in which the metals present promote the oxidation of the diluents.
Our SSX diluents are also used on plants where low aromatic levels in diluents are preferred for health reasons and due to the environmental limits placed on total aromatic emissions. The inert nature of our SSX range of diluents and the low aromatic content makes them suitable for use in such circuits. The aliphatic SSX range is free of poly aromatic compounds which are known carcinogens.
Overall, our aliphatic SSX diluents are preferred in SX circuits containing metals which promote the oxidation of the diluent; in SX plants that are health and safety conscious and those that prescribe to a low level of aromatic emissions for environmental reasons.
Typical specifications of Sasol Wax SSX
| SSX 150 |
SSX 210 |
SSX 230 |
SSX 250 |
Viscosity at
40°C |
cSt |
ASTM
D 445 |
1.19 |
1.9 |
2.4 |
2.78 |
| Flash point |
°C |
ASTM
D 93 |
40 min. |
80 min. |
110 |
110 min |
| Aromatics |
mass % |
ASTM
D 1840 |
0.3 max. |
0.3 max. |
0.5 max. |
0.3 max. |
Copper
corrosion |
|
ASTM
D 130 |
1a |
1a |
1a |
1a |
Density at
20°C |
kg/l |
Sasol
1.173 |
0.73 |
0.75 |
0.76 |
0.77 |
| Odour |
|
|
Neutral |
Odourless |
|
Odourless | |
