The new oxygen production unit will be installed by Air Liquide of France and will have a daily capacity of 3 550 tons of oxygen with a purity of 98.5%.
This will make it the biggest oxygen production unit in the world. Fourteen oxygen units are already in operation at Sasol Synfuels.
The new oxygen unit will be driven by an electric power supply, will incorporate state-of-the-art technology and will be more energy efficient than the existing 14 units.
The new unit will also allow for a higher gas conversion ratio, more stable plant operating conditions and possible expansion of synthesis gas production in future, based on the market demand for fuels and chemicals.
Bram de Klerk, managing director of Sasol Synfuels, said: "Our current oxygen production facility has served us very well since 1975, but it has become necessary to install an additional unit to facilitate production expansion in future."