We are observing high CS2 content in our straight run naphtha. This is not on regular basis but frequent and sometime it goes up to more than 20-25 ppm also. Please advise what can be source of such high CS2 content in naphtha intermittently.
The sources may be narrowed down to:
1. Presence of CS2 in Crude itself- Please suggest the probability of the same and if any known crude with high CS2?
2. Since CS2 formation requires very high temp, can it be formed in crude heaters? or any other process?
3. Though probability is less, can it come from recycle hydrotreated naphtha?
Answers
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29/10/2017
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A:
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Dimitris Orfanidis, Self Employed, d_orfanidis@hotmail.com
See if it is possible to have cracked Naphtha (either raw or Hydrotreated) entering your system, either via Crude or otherwise. CS2 is prominent in C5 cuts from Thermal Cracking and especially Steam Cracking Units and is typically the source of its presence in Units that recycle / coprocess such streams.
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05/11/2015
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A:
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NS Murthy, Suez, murthy.ns.ext@suez.com
Pl check the following especially since we are dealing with potential formation of CS2 in ppm level.
1. If one is processing high acid crude along with high potential H2S bearing crude, one could expect such phenomenon owing to surface cracking in Crude heaters.
2. Check in your crude diet especially those having high asphaltenes. At times the upstream companies add CS2 to prevent asphaltenes plugging in their production lines. In other words, one can get CS2 spikes from such crude.
3. Check slop processing in CDU as it could bring in disulphides from Merox units which may lead to such.
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