氯化铜协同低共熔溶剂(三氯化铁/乙二醇)高效氧化吸收H_(2)S实验研究  

Experimental research of the efficient oxidation and absorption of H_(2)S by CuCl_(2) in cooperation with deep eutectic solvent(FeCl_(3)/EG)

作　　者：金肇波 邱奎[1] 刘霄鹏 刘志豪 刘露微 王英杰 Jin Zhaobo;Qiu Kui;Liu Xiaopeng;Liu Zhihao;Liu Luwei;Wang Yingjie(School of Chemistry and Chemical Engineering,Chongqing University of Science and Technology,Chongqing,China;No.4 Gas Production Plant of Yanchang Gas Field,Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Fuxian,Shaanxi,China)

机构地区：[1]重庆科技学院化学化工学院 [2]陕西延长石油(集团)有限责任公司延长气田采气四厂

出　　处：《石油与天然气化工》2022年第6期8-15,共8页Chemical engineering of oil & gas

基　　金：国家科技重大专项“高含硫气藏安全高效开发技术”(2016ZX05017);中石化集团公司2020年科技项目“有机硫催化水解技术提升元坝气田商品气质量研究”(120049-1)。

摘　　要：目的低共熔溶剂(DES)在气体吸收领域已有一定的研究基础,鉴于其原料价廉易得、制备方法简单、绿色环保,是一种可以替代离子液体的的工业溶剂,具有广阔的应用前景,可用于解决中小规模常规含硫天然气中H_(2)S脱除的工业问题。方法采用六水合三氯化铁(FeCl_(3)·6H_(2)O)、乙二醇(EG)制备了FeCl_(3)/EG低共熔溶剂,并加入无水氯化铜(CuCl_(2))促进H_(2)S的吸收,最终合成DES脱硫剂FeCl_(3)/EG-CuCl_(2)。重点考查了脱硫剂原料配比、反应温度、CuCl_(2)浓度等因素对脱硫性能的影响,并对再生条件进行了探索。结果原料物质的量之比为1∶1的FeCl_(3)/EG低共熔溶剂具有更好的脱硫效果,适当提高反应温度和CuCl_(2)浓度更有利于促进H_(2)S的吸收。脱硫剂可通入氧气进行再生,经过多次脱硫-再生重复使用,脱硫性能变化不大。脱硫产物经过XRD表征结果为斜方硫。结论该DES脱硫剂可以高效吸收H_(2)S并将其转化为硫单质,实现硫元素的循环利用,可为天然气脱除H_(2)S气体工艺提供参考。Objective Deep eutectic solvent(DES)has a certain research foundation in the field of gas absorption.In view of its cheap and easy-to-obtain raw materials,simple preparation method,and green environmental protection,it is an industrial solvent which can replace ionic liquids.The solvent has broad application prospects which can be used to solve the industrial problem of H_(2)S removal in small and medium-scale conventional sour natural gas.Methods FeCl_(3)/EG deep eutectic solvent was prepared by ferric chloride hexahydrate and ethylene glycol(EG),and anhydrous copper chloride(CuCl_(2))was added in it to promote H_(2)S absorption,and finally FeCl_(3)/EG-CuCl_(2)was synthesized as a DES desulfurizer.The influence of factors such as the ratio of desulfurizer raw materials,reaction temperature and CuCl_(2)concentration on the desulfurization performance was focused on,and the regeneration conditions were explored.Results The FeCl_(3)/EG deep eutectic solvent with a raw material molar ratio of 1∶1 had a better desulfurization effect.Appropriately increasing the reaction temperature and CuCl_(2)concentration was more conductive to promoting H_(2)S absorption.The desulfurizer could be regenerated by introducing oxygen,and the desulfurization performance would not change much after repeated desulfurization-regeneration.The desulfurization product was characterized by XRD as rhombic sulfur(α-sulfur).Conclusions The DES desulfurizer can efficiently absorb H_(2)S and convert it into elemental sulfur,realize the recycling of sulfur and provide a reference for the process of removing H_(2)S from natural gas.

关 键 词：低共熔溶剂 脱硫 硫化氢 硫磺 氧化还原法 

分 类 号：TE64[石油与天然气工程—油气加工工程]