本文關(guān)鍵詞：負載型分子篩對揮發(fā)性有機氣體的吸附特性研究　出處：《西安建筑科技大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： VOCs 負載型分子篩 競爭吸附 吸附動力學

【摘要】：揮發(fā)性有機物(Volatile Organic Compounds,VOCs)在常溫下以蒸汽的形式存在于空氣中,大多具有刺激性、毒性和致癌性,長期接觸會損害人體健康并誘發(fā)癌癥;作為PM2.5的前驅(qū)物,VOCs是造成霧霾的元兇之一,公眾健康和生存環(huán)境已經(jīng)嚴重受到威脅。無所不在的VOCs以其危害性和對大氣污染的嚴重性,早已受到了國內(nèi)外的廣泛關(guān)注,對其的處理更是迫在眉睫。對于無回收利用價值的低濃度VOCs廢氣而言,吸附法因其操作方便等優(yōu)點,在石化、油漆涂料、化學制造等行業(yè)的工業(yè)廢氣處理中被廣泛應(yīng)用。實際生產(chǎn)生活中,排放的VOCs廢氣成分較多,有必要探討雙組分以及多組分VOCs廢氣的吸附污染治理。由于研究VOCs在分子篩上的吸附動力學及競爭吸附鮮有報道,因此有必要開展研究工作,從而為工業(yè)放大及生產(chǎn)應(yīng)用奠定基礎(chǔ)。本研究采用以浸漬法制備的Cu-Mn-Ce負載型分子篩為固定床填充材料,以甲苯、乙酸乙酯和丙酮作為VOCs的典型代表,考察了單組分和多組分VOCs在固定床上的吸附特性,同時對Cu-Mn-Ce負載型分子篩吸附VOCs的動力學進行了分析研究。試驗研究基礎(chǔ)上,得到如下研究成果:(1)單因子實驗中,得到甲苯吸附的最佳參數(shù)條件為:空氣流量Q=0.5m3/h、氣體濃度C=400mg/m3和吸附劑量A=800g。(2)本研究中決定Cu-Mn-Ce/5A吸附床層吸附性能的主要因素是VOCs的極性,隨著有機分子極性的增大,甲苯、乙酸乙酯和丙酮在負載型分子篩上的吸附性能不斷提高。(3)Cu-Mn-Ce/5A吸附劑的吸附等溫線屬于I型等溫線,為Langmuir單層可逆吸附過程。根據(jù)甲苯、乙酸乙酯和丙酮的吸附等溫線以及Langmuir方程的擬合結(jié)果可得到:同等條件下,三種有機物的飽和吸附量由大到小的順序是:丙酮乙酸乙酯甲苯。根據(jù)其吸附不同組分VOCs之后的比表面積等指標比較,三種不同吸附質(zhì)中丙酮的吸附性能最好,甲苯最差。(4)負載型分子篩對于單組分和多組分VOCs的吸附穿透過程大體上相似,但后者的穿透時間顯著縮短,單位質(zhì)量吸附劑吸附量明顯下降,穿透曲線上出現(xiàn)了明顯的“駝峰”,認為其吸附穿透過程存在共吸附和競爭吸附現(xiàn)象。(5)選擇Thomas模型和Yoon-Nelson模型模擬吸附過程,發(fā)現(xiàn)))/(ln(0CCC?與時間t之間存在線性關(guān)系。實驗表明,這兩個模型能夠直觀的反映吸附過程中兩個重要的變量之間的關(guān)系,可以較好的應(yīng)用于模擬氣體的吸附特性研究。(6)Yoon-Nelson模型能夠較好模擬Cu-Mn-Ce/5A吸附床吸附不同組分VOCs的吸附過程,說明Cu-Mn-Ce/5A吸附床對不同組分VOCs出口濃度與吸附時間存在固定的關(guān)聯(lián),這對工業(yè)放大及生產(chǎn)應(yīng)用具有實際的指導意義。
[Abstract]:Volatile organic compounds (VOCs) exist in the air in the form of steam at room temperature, and most of them are irritating. Toxicity and carcinogenicity, long-term exposure will damage human health and induce cancer; As the precursor of PM2.5, PM2.5 is one of the main causes of smog. The public health and living environment have been seriously threatened. The ubiquitous VOCs is harmful and serious to the air pollution. It has been widely concerned at home and abroad, and its treatment is even more urgent. For the low concentration VOCs waste gas without recycling value, adsorption method in petrochemical, paint paint because of its advantages such as ease of operation. Industrial waste gas treatment in chemical manufacturing and other industries is widely used. In actual production and life, there are more components of VOCs emissions. It is necessary to study the adsorption pollution control of two-component and multi-component VOCs waste gas. Because there are few reports on the adsorption kinetics and competitive adsorption of VOCs on molecular sieve, it is necessary to carry out research work. In this study, the Cu-Mn-Ce supported molecular sieve prepared by impregnation method was used as the fixed bed filling material and toluene was used as the filling material. Ethyl acetate and acetone were used as typical representatives of VOCs. The adsorption characteristics of single and multicomponent VOCs on fixed bed were investigated. At the same time, the kinetics of adsorption of VOCs by Cu-Mn-Ce supported molecular sieve was studied. On the basis of the experimental study, the following results were obtained: 1) in the single factor experiment. The optimum parameters for toluene adsorption were obtained as follows: air flow rate: Q ~ (2 +) = 0.5 m ~ (3 / h). In this study, the polarity of VOCs is the main factor that determines the adsorption performance of Cu-Mn-Ce/5A adsorption bed. With the increase of the polarity of organic molecules, toluene. The adsorption isotherms of ethyl acetate and acetone on the supported molecular sieve have been improved. The adsorption isotherms of Cu-Mn-Ce5A adsorbent belong to the I-type isotherms. According to the adsorption isotherms of toluene, ethyl acetate and acetone and the fitting results of Langmuir equation, we can get the following results: under the same conditions. The order of saturated adsorption capacity of the three organic compounds from large to small is acetone ethyl acetate toluene. The specific surface area of the three organic compounds is compared according to the specific surface area after the adsorption of different components VOCs. The adsorption performance of acetone was the best among the three adsorbents, and the adsorption penetration process of the supported molecular sieve was similar to that of the single-component and multi-component VOCs. However, the penetration time of the latter was significantly shortened, and the adsorption capacity per unit mass of adsorbent was obviously decreased, and the "hump" appeared obviously on the penetration curve. Thomas model and Yoon-Nelson model were selected to simulate the adsorption process. The experimental results show that the two models can directly reflect the relationship between two important variables in the adsorption process. It can be used to study the adsorption characteristics of simulated gas. Yoon-Nelson model can simulate the adsorption process of different components of VOCs in Cu-Mn-Ce/5A adsorption bed. It is shown that there is a fixed relationship between the outlet concentration of VOCs and the adsorption time in Cu-Mn-Ce/5A adsorption bed, which is of practical significance for industrial amplification and application in production.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X701;O647.3

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