Experimental Optimization and Modeling of Sodium Sulfide Production from H₂S-Rich Off-Gas via Response Surface Methodology and Artificial Neural Network

Abstract

-The existence of hydrogen sulfide (H 2 S) in the gas effluents of oil, gas and petrochemical industries causes environmental pollution and equipment corrosion. These gas streams, called offgas, have high H 2 S concentration, which can be used to produce sodium sulfide (Na 2 S) by H 2 S reactive absorption. Na 2 S has a wide variety of applications in chemical industries. In this study, the reactive absorption process was performed using a spray column. Response Surface Methodology (RSM) was applied to design and optimize experiments based on Central Composite Design (CCD). The individual and interactive effects of three independent operating conditions on the weight percent of the produced Na 2 S (Y) were investigated by RSM: initial NaOH concentration (10-20% w/w), scrubbing solution temperature (40-60°C) and liquid-to-gas volumetric ratio (15 9 10 À3 to 25 9 10 À3 ). Furthermore, an Artificial Neural Network (ANN) model was used to predict Y. The results from RSM and ANN models were compared with experimental data by the regression analysis method. The optimum operating conditions specified by RSM resulted in Y of 15.5% at initial NaOH concentration of 19.3% w/w, scrubbing solution temperature of 40°C and liquid-to-gas volumetric ratio of 24.6 9 10 À3 v/v.Résumé -Optimisation expérimentale et modélisation de la production de sulfure de sodium à partir d'H 2 S riche en gaz provenant de la surface d'intervention méthodologique et de réseau de neurones artificiels -La présence de sulfure d'hydrogène (H 2 S) dans les effluents gazeux rejetés par l'industrie pétrolière, gazière et pétrochimique entraîne une pollution de l'environnement ainsi que la corrosion des équipements. Ces flux gazeux, appelés effluents gazeux, présentent une forte concentration de H 2 S qui peut être employée pour produire du sulfure de sodium (Na 2 S) par absorption réactive de H 2 S. Le Na 2 S trouve une multitude d'applications dans les industries chimiques. Dans cette étude, le processus d'absorption réactive a été réalisé avec une colonne à pulvérisation. La méthode des surfaces de réponses (Response Surface Methodology, RSM) a été appliquée pour concevoir et optimiser des expériences basées sur les plans composites centrés (Central Composite Design, CCD). Les effets individuels et interactifs de trois conditions d'exploitation indépendantes sur le pourcentage en poids de Na 2 S produit (Y) ont été analysés par RSM, à savoir : la concentration de NaOH initiale (10 à 20 % p/p), la température de la solution de lavage (40 à 60°C) et le rapport du volume liquide/gaz (15 9 10

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