乙二胺—乙二醇及其衍生物捕集二氧化硫及制备钡基硫酸盐的研究

发布时间：2018-04-15 00:15

本文选题：SO_2的捕集、储存和利用 + SO_2储集材料(SO_2SM)　；参考：《内蒙古工业大学》2017年硕士论文

【摘要】：全球变暖、臭氧层破坏和酸雨是全球最主要的三大环境问题。其中SO_2是造成酸雨的主要原因之一。近年来,我国政府对SO_2的控制出台了诸多相关政策。在“十一五”期间,我国将SO_2列入考核全国各地的减排指标,SO_2的排放量减少了14%。截止2015年,我国SO_2的排放量比2010年减小了8%。当前,世界各国的脱硫技术有上百种,然而真正能用到商业中的寥寥无几。因此,发展低成本、高性能和绿色可循环的脱硫技术是刻不容缓的。目前,基于氨法脱硫法存在氨的挥发性高和能耗高两大主要问题,本文采用在乙二胺(EDA)中加入乙二醇(EG)及其衍生物(EGs),以氢键的方式与EDA结合,有效的减小了EDA的挥发;同时,胺为强碱性,与SO_2发生了的强烈化学反应,该EDA+EGs体系呈现了优良的SO_2捕集能力(0.364~0.662 gSO_2/g吸收剂)。同时,EDA+EGs体系捕集SO_2后得到了一种新颖的白色固体,命名为SO_2储集材料(SO_2SM)。通过多种技术手段对其进行表征,确定SO_2SM为一种烷基亚硫酸盐铵盐,加热可以释放出SO_2、EDA和EG。根据这一特征,本文利用SO_2SM作为原材料和类表面活性剂来制备具有附加值的BaSO_3和BaSO_4,有效的弥补了氨法中产生能耗高的问题。本文以EDA+EG体系捕集SO_2为典型的研究,用其脱硫产物SO_2SM制备钡基硫酸盐。该研究分为以下2个路线:(1)EDA+EGs体系捕集SO_2首先,对EDA与EG混合体系中分子之间的键合方式进行了研究,得出了固胺机理。在室温下,比较EDA+EGs体系之间吸收SO_2的能力,同时监测了反应过程中吸收体系温度和电导率的变化。研究通过XPS、TGA、FTIR和XRD技术表征脱硫产物SO_2SM,推断出EDA+EG和SO_2反应生成SO_2SM的反应方程式,确定SO_2SM为烷基亚硫酸铵盐,室温下可以稳定储存,加热可以释放SO_2、EDA和EG。(2)共沉淀法制备球状/梭形状BaSO_3和片状/块状BaSO_4在室温下,将SO_2SM和钡盐水溶液直接混合后搅拌,制得直径约为450 nm的球形颗粒;将SO_2SM水溶液缓慢滴定到钡盐水溶液(H2O_2作为氧化剂)中制得片状硫酸钡,通过改变滴加顺序制得块状的硫酸钡。总之,研究选用EDA+EGs体系实现了SO_2的高效捕集、储存及利用。在无外加模板剂的情况下,利用脱硫产物自身所提供的类表面活性剂制备出不同形貌的硫酸钡,这对以后SO_2的捕集研究提供了一个可供选择的方法。
[Abstract]:Global warming, ozone depletion and acid rain are the three major environmental problems in the world.SO_2 is one of the main causes of acid rain.In recent years, our government to SO_2 control issued many related policies.During the eleventh five-year plan, China listed SO_2 as a national emission reduction target and reduced the emission of SO2 by 14%.By 2015, China's SO_2 emissions were 8% lower than in 2010.At present, there are hundreds of desulphurization technologies around the world, but few of them can be used in business.Therefore, the development of low-cost, high-performance and green cycle desulfurization technology is urgent.At present, the ammonia desulfurization process has two main problems: high ammonia volatility and high energy consumption. In this paper, the ethylenediamine ethanediamine (EDAs) and its derivative, EGSN, are combined with EDA by hydrogen bonding, which can effectively reduce the volatilization of EDA.The amines are strong alkalinity and have strong chemical reaction with SO_2. The EDA EGs system shows excellent SO_2 trapping ability of 0.364 ~ 0.662 gSO_2/g absorbent.At the same time, a novel white solid, named SO_2 storage material so _ 2SM _ 2, was obtained by trapping SO_2 in the EDA EGs system.It was confirmed that SO_2SM was a kind of alkyl sulfite ammonium salt by various technical means, so _ 2e _ (DA) and EGG could be released by heating.According to this characteristic, SO_2SM is used as raw material and surfactant to prepare BaSO_3 and BaSO4 with added value, which can effectively remedy the problem of high energy consumption in ammonia process.In this paper, the preparation of barium sulfate from EDA EG system by using SO_2SM as its desulfurization product was studied.This study can be divided into the following two routes: (1) EDA EGs system to trap SO_2. First, the bonding mode between EDA and EG mixed system was studied, and the mechanism of amine fixation was obtained.At room temperature, the ability of absorbing SO_2 between EDA EGs systems was compared, and the changes of temperature and conductivity of the system during the reaction were monitored.The reaction equation for the formation of SO_2SM from EDA EG reaction with SO_2 was deduced by using the FTIR and XRD techniques to characterize the desulphurized product SOS _ 2SM. It was determined that SO_2SM is an alkyl ammonium sulfite, which can be stably stored at room temperature.The spherical / shuttle shaped BaSO_3 and the flake / block BaSO_4 were prepared by co-precipitation method by heating SO2Che EDA and EG.Cu2) at room temperature, SO_2SM and barium salt aqueous solution were mixed directly and stirred to produce spherical particles about 450nm in diameter.The SO_2SM aqueous solution was slowly titrated into the barium salt aqueous solution (H _ 2O _ 2 as oxidant) to produce the flake barium sulfate, and the bulk barium sulfate was prepared by changing the order of dropping.In a word, EDA EGs system is used to realize the efficient capture, storage and utilization of SO_2.Barium sulfate with different morphologies was prepared by using surfactants provided by desulfurization products without additional template, which provides an alternative method for the trapping study of SO_2 in the future.
【学位授予单位】：内蒙古工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ132.35

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