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