Why is caustic added in the SWS column?
Answers
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11/02/2015
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Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com
It is normally used to improve ammonia removal. The caustic raises pH which makes more of the NH3 as NH3 rather than NH4+. You have to be careful on how much is added though or it will hinder H2S stripping.
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10/02/2015
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David Kujawski, Refinery Water Engineering & Associates Inc, dk@refinerywater.net
The pH in the top part of SWS Column is held at 5.5 to strip H2S. The pH is raised in the bottom part of the column to strip NH3. Corrosion control is a secondary consideration.
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10/02/2015
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David Kujawski, Refinery Water Engineering & Associates Inc, dk@refinerywater.net
To convert NH4OH to NH3 so that it can be removed as a vapor.
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10/02/2015
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Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
To control the pH to reduce corrosion.
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