Abstract
To meet the needs in gas-sweetening processes for on-line monitoring of low levels of hydrogen sulfide in alkanolamine solutions, an on-line analysis system has been developed based on the measurement of the intense and broad ultraviolet (u.v.) absorption of the H 2S-amine bond. This system incorporates the following three features to provide the requird accuracy and reliability. To compensate for variation in sample background absorbance from additives and from degradation and corrosion products, a vacuum distillation step is used to strip out H 2S from a process sample to provide an H 2S-free “zero” standard. To compensate for the temperature sensitivity of the u.v. absorption of the H 2S-amine bond, close temperature control as well as a temperature-compensating circuit is provided. To handle sample streams often containing heavy loadings of fine and well-dispersed particulate matter, a special self-cleaning filtering system is used.
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