【摘要】：繼SO2、NOX之后揮發(fā)性有機化合物(VOCs)引起的環(huán)境問題又成為各國關(guān)注的焦點�；钚蕴坷w維(ACF)作為第三代吸附劑擁有著優(yōu)良的吸附性能,廣泛應(yīng)用于VOCs治理技術(shù)中。針對石化、包裝、印刷、制藥、皮革等行業(yè)產(chǎn)生大量的苯、甲苯、丁酮、乙酸乙酯等有機廢氣,本文使用活性炭纖維吸附法并進一步精餾提純,分別對活性炭纖維吸附有機廢氣和后處理提純進行了研究,主要內(nèi)容如下：研究了活性炭纖維對單組份乙酸乙酯和混合組分的吸附特性,結(jié)果表明,活性炭纖維對乙酸乙酯和有機廢氣混合組分的吸附具有吸附平衡時間短、平衡吸附量大,在一定的時間內(nèi)都能使凈化氣中的有機成分達到排放標準,但是混合組分會發(fā)生置換作用而使平衡吸附量會比單組份乙酸乙酯的平衡吸附量稍微大一些,同時不同進氣濃度、流速等因素也會對平衡吸附量有著較大的影響。實驗設(shè)備在運行一個月、三個月和一年時其吸附性能都能保持在80%以上,具有良好的循環(huán)使用性能。通過對活性炭纖維吸附機理的分析,以吸附等溫方程Langmuir方程和Freundlich方程對實驗數(shù)據(jù)進行擬合,發(fā)現(xiàn)Langmuir方程對等溫吸附線的擬合最好,說明了活性炭纖維吸附主要是以單分子層吸附為主,同時也驗證了活性炭纖維具有大量的微孔結(jié)構(gòu)。采用精餾裝置對活性炭纖維吸附解吸后產(chǎn)生的水相進行分離提純,再使用3A分子篩除去回收的有機溶劑中的微量水分。實驗結(jié)果表明,含水率為86%的有機水相經(jīng)過精餾提純后得到含水率為12%,再通過3A分子篩深度提純后得到99.8%的有機溶劑。3A分子篩再生的中試實驗中,選擇吹冷風1h后,在220-C時,吹熱風3h并保證熱空氣出口溫度在150℃左右,降溫時間3h,循環(huán)周期約在7h,再生的分子篩吸附效果良好,符合工業(yè)生產(chǎn)的要求。通過SEM圖對3A分子篩結(jié)構(gòu)進行分析,3A分子篩的吸附性能主要是由其內(nèi)部的膜狀物結(jié)構(gòu)和立方體結(jié)構(gòu)決定的。中試時3A分子篩吸附器運行一年后吸附性能仍良好,脫水后的有機溶劑含水率能夠保持在3%以下,整套設(shè)備運行穩(wěn)定。用CHEMCAD模擬乙酸乙酯和水的精餾過程,模擬結(jié)果如下,當進料組成為含水率為86%的乙酸乙酯混合液,當精餾塔進料塔板為22塊浮閥式塔板時,能夠得到含水率小于10%的乙酸乙酯混合液,理論上計算能夠得到精餾工藝參數(shù)和條件來指導實驗。結(jié)合活性炭纖維吸附和后處理提純各自的優(yōu)勢,本文對有機廢氣吸附回收實例做了工程分析,結(jié)果表明在吸附周期內(nèi),活性炭纖維對有機廢氣的去除率達到98%以上,能夠達到排放標準,具有很好的社會和經(jīng)濟效益。
[Abstract]:After SO2,NOX, the environmental problems caused by volatile organic compounds (VOCs) have become the focus of attention. As the third generation adsorbent, activated carbon fiber (ACF) has excellent adsorption performance and is widely used in VOCs treatment technology. In order to produce a large amount of organic waste gases such as benzene, toluene, butanone, ethyl acetate and so on in petrochemical, packaging, printing, pharmaceutical, leather and other industries, this paper uses activated carbon fiber adsorption method and further distillation purification. The adsorption and purification of organic waste gas by activated carbon fiber were studied respectively. The main contents are as follows: the adsorption characteristics of activated carbon fiber to ethyl acetate and mixed components were studied. The adsorption of the mixture of ethyl acetate and organic waste gas by activated carbon fiber has a short equilibrium time and a large amount of equilibrium adsorption. In a certain period of time, the organic components in the purified gas can reach the emission standard. However, the equilibrium adsorption capacity of the mixed group will be slightly larger than that of the monocomponent ethyl acetate due to the displacement effect. At the same time, different inlet air concentration, flow rate and other factors will also have a greater impact on the equilibrium adsorption capacity. The adsorption performance of the experimental equipment can be kept above 80% in one month, three months and one year, and it has good recycling performance. By analyzing the adsorption mechanism of activated carbon fiber, the experimental data were fitted with the adsorption isothermal equation Langmuir equation and Freundlich equation. It was found that the Langmuir equation fitted the isothermal adsorption line best. The results show that the adsorption of activated carbon fiber is mainly monolayer adsorption, and it is also proved that the activated carbon fiber has a large number of micropore structures. The aqueous phase produced by adsorption and desorption of activated carbon fiber (ACF) was separated and purified by rectifying device and triple-A molecular sieve was used to remove trace water from the recovered organic solvent. The experimental results show that the organic water phase with 86% moisture content is purified by distillation and the moisture content is 12%, and 99.8% organic solvent is obtained after deep purification of 3A molecular sieve. After 1 h of cold air blowing and 220-C, the hot air is blown for 3 h, and the outlet temperature of hot air is about 150 鈩，

本文編號：2296731