January 2014

Process Optimization

HCN distribution in sour water systems

Hydrogen cyanide (HCN) is commonly present in refinery gases. Because of its low volatility and, to some extent, its acidity, it travels through amine and sour water systems in an unusual and, heretof..

Weiland, R., Hatcher, N. A., Optimized Gas Treating, Inc.; Jones, C. E., Optimized Gas Treating

Hydrogen cyanide (HCN) is commonly present in refinery gases. Because of its low volatility and, to some extent, its acidity, it travels through amine and sour water systems in an unusual and, heretofore, poorly understood way. To shine some light on this subject and perhaps develop a worthy solution, a simulation study has been performed with HCN removal being treated on a mass transfer rate basis. This will help develop an understanding of how HCN distributes in the sour water system and where it might form an internal recycle within a tower. HCN is an insidious contaminant in raw gas from cracked stocks, and has far-reaching effects on amine and sour water system performance and equ

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