混合修饰介孔硫化氢吸附剂制备及性能研究

发布时间：2018-01-16 01:04

  本文关键词：混合修饰介孔硫化氢吸附剂制备及性能研究　出处：《东北石油大学》2016年硕士论文　论文类型：学位论文

  更多相关文章： H2S吸附 SBA-15 APTS MEDA TEPA 失活模型

【摘要】：硫化氢气体具有刺激性和腐蚀性,广泛存在于天然气、炼厂气、煤气、沼气当中。硫化氢不但会危害人体健康,同时也会造成催化剂中毒、严重腐蚀金属管道和生产设备,对环境和工业生产都会产生极大危害。为了满足国内外环保法规对工业排放气体中硫含量日益严格的要求,硫化氢的净化方法也在不断发展。本文选取SBA-15为吸附剂载体,采用嫁接和浸渍相结合的改性手段,制得应用于吸附H_2S气体的混合胺改性介孔吸附剂,实验主要内容包括:(一)以γ-氨基丙基三乙氧基硅烷(APTS)为硅烷偶联剂嫁接到SBA-15载体表面,将甲基二乙醇胺(MDEA)浸渍到载体孔道间隙,制备混合胺改性H_2S吸附剂,以实现常温条件下净化气体中H_2S。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、N2吸附/脱附、傅里叶变换红外(FTIR)手段对吸附剂进行了表征。结果表明,吸附剂SBA-15(0.2/50)在温度30℃,原料气H_2S浓度227μL/L,流速100 m L/min条件下,穿透硫容和饱和硫容分别达到0.134和0.164 mmol/g-sorb,原料气中含有水分对吸附效果产生促进作用,吸附剂再生条件温和。吸附剂有序介孔的结构使得吸附过程发生同步效果,表面嫁接和湿浸渍的结合有助于提高吸附剂的稳定性和吸附量。(二)通过对SBA-15载体进行H_2O2活化后嫁接APTS和浸渍TEPA改性,制得混合胺改性吸附剂。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、N2吸附/脱附、傅里叶变换红外(FTIR)手段对吸附剂进行了表征。实验结果表明,吸附剂NH_2-SBA-15(TEPA/40)可以在常压、吸附温度30℃,原料气H_2S浓度227μL/L,气体流速100 m L/min条件下实现对H_2S的吸附。穿透硫容和饱和硫容分别为0.108和0.134mmol/g-sorb。吸附剂在吸附/脱附循环实验中表现出良好的吸附性能,不单具有较高的吸附容量,而且可以通过相对温和的手段再生。进料气体流量不宜过大,吸附剂的吸附性能在一定程度上依赖于H_2S分子与吸附剂间是否有足够充分的接触时间来达到吸附平衡。(三)利用失活模型对吸附剂的吸附穿透曲线进行模拟。失活模型能够适用于分析吸附剂对H_2S的吸附过程,在选定吸附剂且吸附条件确定的情况下,可以通过失活模型对吸附剂的吸附穿透曲线进行分析预测。
[Abstract]:Hydrogen sulfide gas is irritating and corrosive. It is widely used in natural gas, refinery gas, gas and biogas. Hydrogen sulfide will not only harm human health, but also cause poisoning of catalyst. Serious corrosion of metal pipes and production equipment will cause great harm to the environment and industrial production. In order to meet the domestic and foreign environmental protection regulations on industrial emissions of sulfur content increasingly stringent requirements. The purification method of hydrogen sulfide is also developing. In this paper, SBA-15 is selected as the carrier of adsorbent, and the grafting and impregnation are used to modify it. A mixed amine modified mesoporous adsorbent for adsorbing H2S gas was prepared. The main contents of the experiment include: (1) grafted with 纬 -aminopropyltriethoxysilane (APTS) as silane coupling agent onto the surface of SBA-15 carrier. Methyl diethanolamine diethanolamine (MDEA) was impregnated into the pore gap of the carrier to prepare mixed amine modified H2s adsorbent to purify H2Sin gas at room temperature. X-ray diffraction (XRD) was used. The adsorbent was characterized by means of scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). SBA-15 0.2 / 50) at 30 鈩，

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