Magazine: Sulphur

The purpose of this article is to emphasise the lessons learned by ADNOC Sour Gas in the material upgrading of the Shah sulphur granulation plant due to severe corrosion of the aluminium components. The sulphur granulation plant was commissioned in 2015 and consists of a total of 12 granulating systems used for solidifying and granulating the liquid sulphur. The study focused on the corroded areas, namely the GX plenum chambers, the lower section of the granulator exhaust stack, the scrubber inlet and the discharge ducting.

Temperature dependent rate constants for the hydrolysis of CS2 and COS across Claus Al2 O3 and TiO2 catalysts are valuable tools for the design and optimisation of new, as well as existing, sulphur recovery units. In this context, Alberta Sulphur Research Ltd (ASRL) has measured CS2 and COS hydrolysis rates over a range of temperatures for both Al2 O3 and TiO2 catalysts under start-of-run and, more recently, end-of-run first converter conditions. In this article Christopher Lavery, Dao Li, Ruohong Sui, and Robert A. Marriott of ASRL report on their methodology and the utility of the kinetics calculated from their data and draw comparisons between the start-of-run and end-of-run results.

Reduced appetite for sulphur from processed phosphates producers in China will continue to place downwards pressure on pricing in the near term. l Phosphates-based demand is likely to remain low in the second half of 2022 as issues surrounding affordability persist, slowing import requirements.

The US refining sector continues to face operating pressures with 1.3 million bbl/d of closures in the past three years, while sour gas sulphur production has recovered somewhat. Meanwhile, demand from copper and lithium leaching projects will increase use of sulphuric acid over the next few years.

Meena Chauhan, Head of Sulphur and Sulphuric Acid Research, Argus Media, assesses price trends and the market outlook for sulphur.

After two years of virtual events, the CRU Sulphur + Sulphuric Acid 2022 Conference & Exhibition will return to an in-person event at the World Forum, The Hague, 24-26 October 2022. CRU will be welcoming the global sulphur and sulphuric acid community to this premier annual event for networking and essential updates on the markets and technical developments that are influencing the industry.

By recovering waste heat as process steam or electrical energy, technologies are available that can help sulphuric acid plants meet their energy goals. Colin Shore of Elessent Clean Technologies discusses how MECS® HRS™ technology can offer a sustainable solution to enhance sulphuric acid plant performance, while lowering its carbon emissions.

Chinese refinery output has been steadily falling this year as covid-related lockdowns impact upon the economy. Figures from the National Bureau of Statistics showed that refinery output fell to 13.8 million bbl/d in April – down 2% year on year – then took a sharp fall in May to 12.6 million bbl/d, more than 10% down on the same time in 2021, when output stood at 14.1 million bbl/d. May’s figure was 12.7 million bbl/d, a modest increase on April, but still 1.6 million bbl/d down compared to May 2021. Refining margins have also been hurt by high oil prices due to the Ukraine conflict, dropping close to zero or even negative according to industry estimates.

The past couple of years have been quite the wild ride, with major global events dominating markets outside of the usual concerns of broad market supply and demand. It seems like a long time ago now, but this time last year, the price of a barrel of Brent crude was about $75. Go back two years, in the wake of the onset of covid restrictions, and that barrel would have cost you $40 (and just $25 a couple of months before that). In the wake of Russia’s attack on Ukraine, you could easily have paid $130, and it has been hovering around $110/bbl for the past few months. The last time oil spent any time at that level was in 2014, just before the Chinese economy ran out of steam and prices slumped by 70%.

At the end of June a three day strike among workers at Chilean state mining company Codelco paralysed copper output at the world’s largest copper producer. The strike was in protest at the threatened closure of the Ventanas smelter, which was the site of an alleged leak of sulphur dioxide on June 6th. Chile’s environmental regulator subsequently provisional measures for both Codelco and power company AES Chile after numerous people in the nearby towns of Quintero and Puchuncavi in central Chile, including hundreds of high school students and staff, showed signs of sulphur dioxide poisoning. The measures include the installation of a new temperature sensor to measure potential thermal inversions. Both companies have denied responsibility for the leak; Codelco says that its air quality stations recorded normal levels of SO2 during the time of the incident.