Our Breakthrough Technology
oxidises sulphur-containing hydrocarbon molecules (including sulphur-containing polyaromatic hydrocarbon compounds) in hydrocarbons to their respective sulphone, which can then be separated and concentrated using extraction technology, due to the polar nature of the oxidised molecules.
In so doing, the resultant hydrocarbon has a low/ultra-low sulphur content, reduced polyaromatic hydrocarbon content, reduced nitrogen content and increased stability by virtue of the oxidation of reactive hydrocarbon compounds.
Ultrex® Units can be constructed in standard sizes of up to 15,000 barrels per day processing capacity. Multiple Ultrex® Units in a suitable combination of sizes can be supplied to meet the customer’s specific processing capacity needs.
Ultrex® Units can be located within a refinery precinct or at a tank farm or pipeline terminal.
Ultraclean Technology has developed a solution for the separation of sulphur from hydrocarbons, comprised of a patented chemical process (Ultrex®) and a proprietary liquid phase transfer catalyst (PTC). The Ultrex® solution is a commercial scale oxidative desulphurisation process that
The functional concept of the Ultrex® process is based on the philosophy that the Sulphur bearing hydrocarbons molecules are oxidised to their dioxide equivalent using an oxidation process.
When these Sulphur species are oxidised to their dioxide equivalent (Sulfones), the sulphur bearing molecules exhibit:
Higher boiling point – allowing the sulphur species to be concentrated and removed through distillation
Increased Polarity – allowing the sulphur species to be extracted using a polar solvent
The oxidation of sulphur species is difficult due to electron density and sulphur atom position on the parent aromatic ring.
Due to this, the oxidation process requires a strong oxidant media to transform the sulphur portion of the aromatic molecule to its sulfone equivalent.
An active source of oxygen is required in the process, such as peroxide.
Active oxygen needs to be transported from the aqueous oxidant media into the oil phase, which is achieved via a phase transfer catalyst (PTC) plus vigorous mixing.
Following oxidation, the sulphone molecules are highly polar and can be removed from the parent oil using a polar solvent in a liquid-liquid extraction process.
The polar solvent ‘strips’ the sulphones from the oxidised oil in a counter-current extractor column, concentrating these in a high-sulphur residual product.
A water wash or steam strip is performed on the stripped oil to remove any residual solvent, leaving an ultra-low or low product depending on required specification. The used solvent is regenerated and reused in a continuous process.
For some heavy residual oils, a distillation step is used in lieu of liquid-liquid solvent extraction; producing a low sulphur fuel oil and concentrating the sulphones and asphaltenes in a bitumen extender by-product.
Ultraclean ‘Beta’ unit - 1,000 bpd
The Ultrex® solution has been successfully demonstrated at a scale of 1,000 barrels per day in a pilot unit to separate low sulphur diesel into ultra-low sulphur diesel plus a high sulphur residue product suitable for use as off-road non-taxable diesel or as marine fuel (0.5% wt)
Competitive Advantage vs hydrodesulphurisation
Simpler, cleaner, and safer….
Significantly reduced carbon footprint versus HDS (estimated ~ 60% reduction on CO2 intensity for Hydrotreating)
Lower energy requirement than HDS
No process waste
Reduced sulphur content
Reduced polyaromatic hydrocarbon content
Reduced nitrogen content
No production of hydrogen sulphide
Significantly lower capital cost than HDS
No use of hydrogen so no need for access to natural gas to manufacture hydrogen
EASE OF DEPLOYMENT
Shorter time frame to manufacture, deploy and commission
Can be deployed in both tank farms and refineries
Modular design means installation complexity is reduced