本文選題：甲醇 + 離子液體��； 參考：《北京化工大學》2015年碩士論文

【摘要】：工業(yè)生產中,常常需要將合成氣,天然氣或者燃料氣等物流中的C02有效地脫除。本文針對物理吸收法中甲醇吸收CO2進行了改性,分別采用離子液體[OMIM][Tf2N]和ZIF-8對其改性,研究了體系C02-甲醇一[OMIM][Tf2N]和C02-甲醇-ZIF-8的相平衡。收集了文獻中甲醇吸收CO2的實驗數據,擬合出CO2與甲醇和C02與離子液體基團的UNIFAC目互作用參數。測定了273.2 K、258.2 K、243.2K和228.2 K時,0-3.5MPa下,二元體系CO2(1)+甲醇(2),CO2(1)+[OMIM][Tf2N](3)以及三元體系CO2(1)+甲醇(2)+[OMIM][Tf2N](3)(w3=0.20,0.50,0.80)的氣液相平衡數據。結果表明,在低溫(273.2 K以下)條件下,UNIFAC對于純甲醇、純離子液體和甲醇與離子液體混合物中CO2的溶解度都能夠很好地進行預測,并且CO2的溶解度隨著溫度的降低,壓力的升高而增大,并且遵循以下規(guī)律：xw3:0.00xw3:0.20xw3:0.50 xw3:0.80xw3:1.00,亨利常數則呈現相反的規(guī)律。本文采用Aspen plus軟件模擬了CO2的吸收分離過程,結果表明[OMIM][Tf2N]的加入不僅降低了甲醇的夾帶量,同時也降低了能量的消耗。用GCMC方法計算得到了ZIF-8材料吸附CO2的吸附等溫線,將本實驗中的模擬計算值和文獻中的實驗值進行了對比,證明了模擬結果真實可靠。本文主要研究了批量合成ZIF-8的方法。在文獻基礎上,進行適當放大并成功地進行了ZIF-8的批量合成。測定了273.2 K,258.2 K和243.2K時,0-3.5 MPa下,二元體系C02(1)+甲醇(2)以及三元體系C02(1)+甲醇(2)+ZIF-8(3)(w3=0.05,0.10,0.15)的氣液相平衡數據。分別采用UNIFAC模型和GCMC方法對C02在純甲醇中的吸收數據和ZIF-8中吸附數據進行預測。并用二者構成的杠桿規(guī)則預測甲醇和ZIF-8混合物中的溶解度數據。實驗證明,杠桿規(guī)則能夠用來預測吸附吸收過程中氣體溶解平衡。低壓下ZIF-8的加入能增加CO2的溶解度,但高壓下,增加趨勢不明顯�；旌先軇┛梢悦黠@的降低甲醇的氣相揮發(fā)量。原則上,使用ZIF-8和甲醇的混合物代替?zhèn)鹘y(tǒng)溶劑比較容易在工業(yè)上實現。
[Abstract]:In industrial production, CO2 must be effectively removed from logistics such as syngas, natural gas or fuel gas. In this paper, CO2 was modified by methanol in physical absorption method. The phase equilibrium of C02-methanol-[ OMIM] [Tf2N] and C02-methanol-ZIF-8 were studied by using ionic liquid [OMIM] [Tf2N] and ZIF-8 respectively. The experimental data of methanol absorption of CO2 in literature were collected and the UNIFAC mesh interaction parameters of CO2 with methanol and CO2 with ionic liquid group were fitted. The vapor-liquid phase equilibrium data of the binary system CO _ 2O _ (1) (OMIM) [Tf2N] ~ (3) and ternary system CO _ (2) O _ (1) [OMIM] [Tf2N] (0.200.500.80) have been measured at 273.2 K ~ (2 +) 258.2 K ~ (2 +) K ~ (2 +) and 228.2 K ~ (0.5) MPA. The results show that the solubility of CO2 in pure methanol, pure ionic liquid and mixture of methanol and ionic liquid can be well predicted under low temperature (< 273.2 K), and the solubility of CO2 decreases with temperature. The pressure increases and follows the following rule: xw3: 0.00xw3: 0.20xw3: 0.50xw3: 0.80xw3: 1.00. the Henry constant shows the opposite rule. In this paper, the absorption and separation process of CO2 is simulated by Aspen plus software. The results show that the addition of [OMIM] [Tf2N] not only reduces the entrainment of methanol, but also reduces the energy consumption. The adsorption isotherms of CO2 adsorbed by ZIF-8 materials were calculated by GCMC method. The simulated results were compared with the experimental values in literature, and the simulation results were proved to be true and reliable. In this paper, the method of batch synthesis of ZIF-8 is studied. On the basis of the literature, the batch synthesis of ZIF-8 was carried out successfully. The vapor-liquid phase equilibrium data of binary system C02O1) methanol-2) and ternary system C02O1) methanol-2) at 273.2 Ku 258.2K and 243.2K were determined. The absorption data of CO2 in methanol and adsorption data in ZIF-8 were predicted by UNIFAC model and GCMC method respectively. The solubility data of methanol and ZIF-8 mixtures were predicted by the lever rule. The experimental results show that the lever rule can be used to predict the equilibrium of gas dissolution in the process of adsorption and absorption. The solubility of CO2 can be increased by adding ZIF-8 at low pressure, but the increasing trend is not obvious at high pressure. The mixed solvent can obviously reduce the volatile amount of methanol in the gas phase. In principle, it is easier to use a mixture of ZIF-8 and methanol instead of traditional solvents.
【學位授予單位】：北京化工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ413.2;TQ028.14

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本文編號：1876916