I. Where?
II. Why?
III. What?
IV. How?
Hydrodenitrification.
Hydrodesulfurization.
In conversion of MethlyCycloPentane to
Cyclohexane.
To enhance the activty of catalyst.
To Control the hyperactivity as dealing
with fresh or regenerated catalyst when
loaded.
It Selectively poisions the active sites that
may degrade benzene formation.
Presulfiding agents:
-DMS.
-DMDS.
-DMSO.
-TNPS.
-EXACT-S® DMS.
-Methane thiol .(Methyl Mercaptan)
Catalyst is arranged and air(O2) stripped
with inert gas.
Dehydrate the Catalyst.(200-250 ⁰F)
Now hydrogen with pressure and startup
oil is introduced and allow to soak the catalyst.(250-400 ⁰F) at 50 ⁰F per Hr.
Injection of sulfur spike at 350-400 ⁰F.
When the temperature of the catalysts
bed is increased and maintained at 450 -
500ºF, the sulfur spike decomposes under
heat and catalytic action.
Hydrogen reacts with the sulfur spike
producing hydrogen sulfide (H2S). Some
methane gas is also released as the
sulfur spike decomposes.
The presulfiding will be terminated as
soon as the catalyst sulfided,this can be
know by measuring H2S in oulet stream.
Continuously measures H2S concentration using dispersive UV-V’s absorbance spectrophotometer
Totally solid state build with no moving parts modern design for low maintenance
Easily multiplexed to analyze sample streams from multiple sampling points simultaneously
Decades of field-proven performance in various catalytic processes, e.g. propane dehydrogenation
http://www.gaylordchemical.com/uploads
/images/pdfs/literature/205B.pdf
http://www.researchgate.net/publication/2
44108152_Pt-Re-
SnAl_2O_3_trimetallic_catalysts_for_naphth
a_reforming_processes_without_presulfiding
_step paper published by V.A.Mazzieri.
http://www.a-a-
inc.com/documents/AA_AN015_Monitoring
-Catalyst-Presulfiding-Step.pdf
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