What are the sources of phenol in overhead condensate (sour water) in a vacuum distillation unit?
Answers
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25/04/2017
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A:
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Peter Marsh, XBP Refining Consultants Ltd, peter.marsh@xbprefining.co.uk
Phenols can be formed by air ingress to the overhead system of deep cut VDUs if thermal cracking produces small amounts of light olefin. Phenolic compounds are not readily stripped from sour water so stripped sour water from the VDU should not be routed to a hydrocracker for use as wash water because any residual oxygen or phenolic compounds may cause oxidation of bisulphide compounds to elemental sulphur which creates equipment fouling problems. Stripped sour water should be routed instead to the CDU as desalter wash water where most of the phenolic compounds will dissolve in the crude oil.
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31/03/2017
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Sridhar Balakrishnan, Bharat Oman Refineries Limited , laksrid@yahoo.com
Sources of phenol in overhead condensate in a vacuum distillation unit , may be due to recycling of stripped sour water to desalter.
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