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08649 Development and Field Deployment of a Novel Acidic Triethylene Glycol Buffer Chemical for Bringing Gas Dehydrators Back into Specification

Picture for 08649 Development and Field Deployment of a Novel Acidic Triethylene Glycol Buffer Chemical for Brin
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Product Number: 51300-08649-SG
ISBN: 08649 2008 CP
Author: Jonathan J. Wylde and Alistair W. Duthie
Publication Date: 2008
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The triethylene glycol (TEG) in the operated Bruce platform glycol dehydrator towers was seen to steadily increase to over pH 10. This rise in pH was found to be attributable to the carry over of triazine based H2S scavenger chemical, used to treat sour process gas. This paper details the root cause failure analysis as well as the various mitigation strategies researched and developed and the final field deployment. High glycol pH increased the risk of process upsets because it had an affect on the resultant gas dew point and therefore promoted concern over the dehydration efficiency at re-boiler temperatures of 200°C. Further potential issues included foaming, regeneration efficacy, solids precipitation and increased scale potential.
The triethylene glycol (TEG) in the operated Bruce platform glycol dehydrator towers was seen to steadily increase to over pH 10. This rise in pH was found to be attributable to the carry over of triazine based H2S scavenger chemical, used to treat sour process gas. This paper details the root cause failure analysis as well as the various mitigation strategies researched and developed and the final field deployment. High glycol pH increased the risk of process upsets because it had an affect on the resultant gas dew point and therefore promoted concern over the dehydration efficiency at re-boiler temperatures of 200°C. Further potential issues included foaming, regeneration efficacy, solids precipitation and increased scale potential.
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