Leckel D.,Sasol Limited
Fuel Processing Technology | Year: 2011
Gas-to-liquids (GTL) and also coal-to-liquids (CTL) Fischer-Tropsch plants using high-temperature (entrained flow) gasification all face the same refining challenge, which is meeting the EN590 density specifications of 820 kg m -3 at 15 °C for the produced distillate. Fischer-Tropsch distillates can, however, be blended with high density distillates originating from sources such as crude oil, direct coal liquefaction or coal pyrolysis products, in an effort to conform to those diesel density requirements. Fixed bed dry bottom (FBDB) gasification technology can in combination with high-temperature Fischer-Tropsch (HTFT) synthesis provide a way to produce final on-specification CTL transportation fuels. Hydroprocessing FBDB gasification tar results in a distillate with high density whereas a hydrotreated HTFT distillate corresponds to a highly paraffinic product with high cetane number but low density. Both distillates can be blended to produce a market-ready final diesel which is of particular industrial importance for CTL applications in countries which have no oil but low-rank coals instead and viable options for carbon capture and storage (CCS). © 2010 Elsevier B.V.
Van Werner Merwe D.E.R.,Sasol Limited
Environmental Science and Technology | Year: 2010
Solid phosphoric acid (SPA) catalysts are widely used in the petroleum industry. Despite a high phosphorus content the spent catalyst is generally not reused. Moreover, due to the limited life spans that are achieved industrially, large quantities of spent catalyst requires disposal, often by landfill. SPA can be readily converted to fertilizer, but the presence of carbonaceous deposits on the catalyst presents a potential environmental hazard. This work demonstrates that these deposits are mostly polyaromatic (amorphous carbon) with smaller amounts of oxygenates and aliphatics. Neither the chemical makeup nor the physical structure of the catalyst or the presence of coke precludes it from use as fertilizer. Subsequently, the spent catalystwas milled, neutralized with lime and ammonium hydroxide, and then calcined to yield a phosphate-rich fertilizer. Toxicity characteristic leaching tests of the spent catalystfertilizer showed low levels of metals and organics, establishing that no harmful compounds are likely to be absorbed into plant life or groundwater. A plant growth study of the spent catalyst fertilizer indicated that it is approximately as effective as superphosphate fertilizer when used in alkaline soil. The spent catalyst fertilizer is environmentally benign and economically efficient. © 2010 American Chemical Society.
Sasol Limited | Date: 2014-05-06
A process for the tetramerisation of ethylene includes contacting ethylene with a catalyst under ethylene oligomerisation conditions. The catalyst comprises a source of chromium, a ligating compound, and an activator. The ligating compound includes a phosphine that forms part of a cyclic structure.
Sasol Limited and Axens | Date: 2014-04-16
Sasol Limited | Date: 2014-01-24
The present invention relates to highly concentrated, anhydrous amine salts of hydrocarbon polyalkoxy sulfates, wherein the salts are selected from the group of substituted amines, preferably alkanolamines. The products obtained are of low viscosity and pumpable at room temperature. Due to the absence of water, the salts are highly resistant to hydrolysis, even at high temperatures. The invention further relates to the use of the compositions according to the invention in an aqueous dilution for use in oil reservoirs with the aim of achieving enhanced oil production, or for the recovery of hydrocarbons from tar sands or other surfaces or materials provided with hydrocarbon.