Kinetics of the reaction between hydrogen and sulfur under high-temperature Claus furnace conditions

Simulation, equipment performance evaluation and sensitivity analysis as a comprehensive parametric study of sulfur recovery unit

“…Conversely, the equilibrium tends to reverse reaction or hydrogen sulfide thermal dissociation at high temperatures. Therefore, they concluded that the quench temperature could prevent further H 2 S production and increase the recovery of sulfur . In another study, the Claus reaction furnace was modeled using the corrected Gibbs energy minimization method by Zarei et al so that significant error reduction from 33.50 to 7.86% was occurred in the prediction of the molar flow rate of components …”

Simulation of hydrogen production from thermal decomposition of hydrogen sulfide in sulfur recovery units

“…the reverse reaction of Equation (4) was investigated by Dowling et al (1990). Their experiment was carried out with a feed of hydrogen and sulfur diluted to 0.88% and 6e12%, respectively, with nitrogen in a temperature range of 602e1290 C, pressure at approximately atmospheric level and residence times from 0.03 to 1.5 s. The reaction order with respect to S 2 in the recombination reaction was found to be unity and the decomposition reaction order was assumed to be unity.…”

“…They cited inconsistencies and disagreements in the results published by Kaloidas and Papayannakos (1989) and Dowling et al (1990). Their study was carried out under the Claus reaction furnace conditions with H 2 S feed using an isothermal, plug-flow reactor at temperatures between 850 and 1150 C and residence times of 50e1500 ms.…”

“…As a result of the findings of Hawboldt et al (2000), Kaloidas and Papayannakos (1997) published an erratum where they corrected the frequency factor of the recombination reaction from 132 mol/ (cm 3 s bar 3/2 ) to 2.2 mol/(cm 3 s bar 3/2 ). Also, the results of Dowling et al (1990) were reevaluated and new ones published in Dowling and Clark (1999). In the new study, the rate expression was determined as below for the H 2 /S 2 recombination and H 2 S decomposition reactions, respectively.…”

Formation of polycyclic aromatic hydrocarbons in Claus process from contaminants in H2S feed gas

“…While a detailed mechanism for aromatics formation in Claus furnace with feed containing above mentioned components could not be found in the literature, several studies on the development of reactions mechanism for the individual components were present (Gargurevich, 2005;Dowling et al, 1990;Karan and Behie, 2004).…”