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We are getting very high iron and chloride content in our stripped water processed in sour water stripper unit which is used in our DHDS unit. What can be the possible reason and what we can do to minimize it?
 
Answers
09/01/2016 A: Satish Angadi, Haldor topsoe, satish.angadi@gmail.com
As mentioned in earlier answers, have you checked heat exchangers?
Have you checked the feed to DHDS unit for chlorides in the feed itself?
If yes, what is the source of make-up hydrogen? is it CCR hydrogen? If yes, check chlorides/organic acids in make-up hydrogen gas.
08/01/2016 A: Satyalal Chakravorty, Sr Consultant, satya1354@yahoo.co.in
Please check that the column top temperature is sufficiently high( 85 to 90 Degree C) to prevent deposit of Ammonium Salt . This deposit leads to overhead corrosion and will show presence of iron in stripped water. The source of chloride is likely to be from the leak of cooling water in the overhead cooler. The poor desalting at CDU can also result in iron & chloride carry over from CDU overhead water.
06/01/2016 A: Prakash Pimparkar, Environmental Consulting Services , prakash.pimparkar@yahoo.in
What kind of cooling water you are using. The only source could be cooling water leakage. Check for the HE leakages. There is no way chlorides and iron to be in sour water.
06/01/2016 A: NS Murthy, Suez, murthy.ns.ext@suez.com
High Fe indicates extensive corrosion and high chloride indicate ingress of chloride from upstream units viz. CDU / VDU / Coker/ FCC etc. GE Water & Process Technology team has been providing solutions to such including mitigation at source.
06/01/2016 A: Sudhakara Babu Marpudi, Dangote Oil Refinery Company, m_sudhakarababu@yahoo.com
Check the seawater coolers for leaks in the upstream units that are the sources for sour water. Seawater could be the source for chlorides.