Can someone share experiences of corrosion in alkylation units ? How do you control it ? Do you add chemicals for the same?
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12/05/2016
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Peter Marsh, XBP Refining Consultants Ltd, peter.marsh@xbprefining.co.uk
The key focus areas for minimising corrosion inside process piping and equipment in H2SO4 and HF alkylation units are 1) removal of contaminants from the feed and acid makeup streams, 2) removal of trace acids from the reactor effluent and relief streams, 3) appropriate materials selection, 4) controlling all variables within their operating limits and 5) rigorous preventative maintenance and inspection programmes. Corrosion under insulation can also affect external surfaces of process piping and equipment since operating temperatures in the reaction section are typically relatively low. If all these issues are addressed, there should be a low risk of loss of acid containment. But if a leak occurs, it needs to be addressed promptly and the root cause identified before the affected equipment is returned to service.
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12/05/2016
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NS Murthy, Suez, murthy.ns.ext@suez.com
The query is very generic and does not specify place of actual corrosion. further, it does not say whether the alky unit is based on HF or H2SO4. Only one that comes immediately to my mind is that the key will be to control moisture ingress via feed C4s streams.
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11/05/2016
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Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com
Corrosion control is primarily accomplished through proper materials selection and control of operating conditions. Sulfuric acid alkylation units do often inject some caustic downstream of the acid settler to neutralize acid going into the fractionation system.
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