本文關鍵詞：混合修飾介孔硫化氫吸附劑制備及性能研究　出處：《東北石油大學》2016年碩士論文　論文類型：學位論文

  更多相關文章： H2S吸附 SBA-15 APTS MEDA TEPA 失活模型

【摘要】：硫化氫氣體具有刺激性和腐蝕性,廣泛存在于天然氣、煉廠氣、煤氣、沼氣當中。硫化氫不但會危害人體健康,同時也會造成催化劑中毒、嚴重腐蝕金屬管道和生產(chǎn)設備,對環(huán)境和工業(yè)生產(chǎn)都會產(chǎn)生極大危害。為了滿足國內(nèi)外環(huán)保法規(guī)對工業(yè)排放氣體中硫含量日益嚴格的要求,硫化氫的凈化方法也在不斷發(fā)展。本文選取SBA-15為吸附劑載體,采用嫁接和浸漬相結合的改性手段,制得應用于吸附H_2S氣體的混合胺改性介孔吸附劑,實驗主要內(nèi)容包括:(一)以γ-氨基丙基三乙氧基硅烷(APTS)為硅烷偶聯(lián)劑嫁接到SBA-15載體表面,將甲基二乙醇胺(MDEA)浸漬到載體孔道間隙,制備混合胺改性H_2S吸附劑,以實現(xiàn)常溫條件下凈化氣體中H_2S。采用X射線衍射(XRD)、掃描電子顯微鏡(SEM)、N2吸附/脫附、傅里葉變換紅外(FTIR)手段對吸附劑進行了表征。結果表明,吸附劑SBA-15(0.2/50)在溫度30℃,原料氣H_2S濃度227μL/L,流速100 m L/min條件下,穿透硫容和飽和硫容分別達到0.134和0.164 mmol/g-sorb,原料氣中含有水分對吸附效果產(chǎn)生促進作用,吸附劑再生條件溫和。吸附劑有序介孔的結構使得吸附過程發(fā)生同步效果,表面嫁接和濕浸漬的結合有助于提高吸附劑的穩(wěn)定性和吸附量。(二)通過對SBA-15載體進行H_2O2活化后嫁接APTS和浸漬TEPA改性,制得混合胺改性吸附劑。采用X射線衍射(XRD)、掃描電子顯微鏡(SEM)、N2吸附/脫附、傅里葉變換紅外(FTIR)手段對吸附劑進行了表征。實驗結果表明,吸附劑NH_2-SBA-15(TEPA/40)可以在常壓、吸附溫度30℃,原料氣H_2S濃度227μL/L,氣體流速100 m L/min條件下實現(xiàn)對H_2S的吸附。穿透硫容和飽和硫容分別為0.108和0.134mmol/g-sorb。吸附劑在吸附/脫附循環(huán)實驗中表現(xiàn)出良好的吸附性能,不單具有較高的吸附容量,而且可以通過相對溫和的手段再生。進料氣體流量不宜過大,吸附劑的吸附性能在一定程度上依賴于H_2S分子與吸附劑間是否有足夠充分的接觸時間來達到吸附平衡。(三)利用失活模型對吸附劑的吸附穿透曲線進行模擬。失活模型能夠適用于分析吸附劑對H_2S的吸附過程,在選定吸附劑且吸附條件確定的情況下,可以通過失活模型對吸附劑的吸附穿透曲線進行分析預測。
[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 緯 -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，

本文編號：1430839