Optimization of High-Gravity Chelated Iron Process for Removing H_2S Based on Response Surface Methodology  

作　　者：Luo Ying Zhang Zhongzhe Qi Jibing Li Gang Qi Guisheng Liu Youzhi 

机构地区：[1]Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China

出　　处：《China Petroleum Processing & Petrochemical Technology》2015年第3期87-93,共7页中国炼油与石油化工（英文版）

基　　金：financially supported by the National Science Foundation of China (No. 21376229);the Science and Technology Development Plan of Shanxi Province (No. 20130321035-02)

摘　　要：By using a mixture of N2 and H2S as the simulated APG(associated petroleum gas), the desulfurization experiment was performed in a cross-flow rotating packed bed(RPB) based on the chelated iron oxidation-reduction method. In order to determine the operating conditions of the system, the effects of the concentration of Fe3+ ions(ranging from 0.1 to 0.2 mol/L), the liquid-gas volume ratio(ranging from 15 to 25 L/m3) and the high gravity factor(ranging from 36 to 126) on the removal of H2 S were studied by means of the Box-Behnken design(BBD) under response surface methodology(RSM). The overall results have demonstrated that the BBD with an experimental design can be used effectively in the optimization of the desulfurization process. The optimal conditions based on both individualized and combined responses(at a Fe3+ ion concentration of 0.16 mol/L, a liquid-gas volume ratio of 20.67 L/m3 and a high gravity factor of 87) were found. Under this optimum condition, the desulfurization efficiency could reach 98.81% when the H2 S concentration was 7 g/m3 in APG. In this work, the sulfur product was analyzed by X-ray diffraction(XRD), scanning electron microscopy(SEM) and the energy dispersive X-ray spectrometer(EDX). The results of analysis show that the sulfur is made of the high-purity orthorhombic crystals, which are advantageous to environmental conservation.By using a mixture of N2 and H2S as the simulated APG （associated petroleum gas）, the desulfurization experimentwas performed in a cross-flow rotating packed bed （RPB） based on the chelated iron oxidation-reduction method. Inorder to determine the operating conditions of the system, the effects of the concentration of Fe3＋ ions （ranging from 0.1 to0.2 mol/L）, the liquid-gas volume ratio （ranging from 15 to 25 L/m3） and the high gravity factor （ranging from 36 to 126） onthe removal of H2S were studied by means of the Box-Behnken design （BBD） under response surface methodology （RSM）.The overall results have demonstrated that the BBD with an experimental design can be used effectively in the optimizationof the desulfurization process. The optimal conditions based on both individualized and combined responses （at a Fe3＋ ionconcentration of 0.16 mol/L, a liquid-gas volume ratio of 20.67 L/m3 and a high gravity factor of 87） were found. Under thisoptimum condition, the desulfurization efficiency could reach 98.81% when the H2S concentration was 7 g/m3 in APG. Inthis work, the sulfur product was analyzed by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and the energydispersive X-ray spectrometer （EDX）. The results of analysis show that the sulfur is made of the high-purity orthorhombiccrystals, which are advantageous to environmental conservation.

关 键 词：hydrogen sulfide chelated iron high gravity technology response surface methodology Box-Behnken design 

分 类 号：TE624.55[石油与天然气工程—油气加工工程]