- Technical Breakthrough to Conventional HDS Limitations -

• The biggest challenge for conventional
Hydrodesulphurization (HDS) is that
whilst it can remove the aliphatic sulphur
compounds (thiols), it finds it very difficult
to remove, through its mechanism of
hydrogen addition, the refractory
(thiophene-derivative) S-compounds. The
vast majority of desulphurisation capacity
in the global refining sector today is based
on HDS.

• The HDS chemistry’s inability to remove
the refractory S-compounds lies at the
heart of the problem in providing low sulphur
grade bunker fuel to meet the
MARPOL 2020 limit of 0.5% sulphurcontent.
As such, we find that much of the
S-content in Residuum Feeds & Off-spec
Bunker is thiophenic.

• Curve has developed a Proprietary Nano
Chemistry that pursues the more heavy
compounds as a priority - the refractory
thiophenic compounds. Curve does not
encounter the steric hindrance that
prevents HDS from removing the
refractory S-compounds. In fact Curve is
tuned to go for the heavier thiophene

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