Hydrocarbons derived from crude naturally contain significant amounts of unwanted impurities which are detrimental to the polymerisation processes. With our Fischer-Tropsch process we produce synthetic hydrocarbons containing only a few of these unwanted impurities. Through further hydro treating and other purification steps, we reduce these impurities even further to acceptable levels and beyond.
The high level of purity, being free of catalysts poisons such as oxygenates, sulphur, carbonyls, cyclic compounds or dienes and the relative inertness of our PolyParTM range make them suitable solvents or diluents for the polymerisation industry. They find use as reaction solvent in solution phase polymerisation to produce linear low density polyethylene (LLDPE) and high density polyethylene (HDPE), in slurry phase processes to produce polypropylene (PP) or various grades of polyethylene (PE) and in gas phase processes as catalyst or external donor carriers, and as diluents for peroxide to control rheology during the extrusion process.
Low aromatic (especially poly aromatic) levels and low benzene content makes our hydro treated PolyParTM range of synthetic hydrocarbons suitable for food contact applications.
Typical specifications for Sasol Wax PolyparTM
| PolyParTM 50 |
PolyParTM 100 |
PolyParTM 150 |
PolyParTM 200 |
| Benzene |
ppm |
50 |
<10 |
<1 |
<1 |
| Aromatics |
ppm |
50 |
50 |
50 |
50 |
| Chlorides |
ppm |
<1 |
<1 |
<1 |
<1 |
| Initial boiling point |
°C |
50 |
100 |
150 |
200 |
| Dry point |
°C |
100 |
125 |
200 |
240 |
| Odour |
|
Neutral |
Neutral |
Neutral |
Neutral |
| Bromine index |
mg Br/100 g |
<10 |
<10 |
<10 |
<10 |
| Sulphur |
ppm |
<1 |
<1 |
<1 |
<1 | |
