本文選題：乙醇-甲乙酮　切入點(diǎn)：離子液體　出處：《北京化工大學(xué)》2015年碩士論文

【摘要】：乙醇和甲乙酮是兩種工業(yè)常用有機(jī)物,二者之間在常壓下可以形成共沸,因而二者混合后不能用普通精餾方法進(jìn)行分離。離子液體以其熔點(diǎn)低、飽和蒸汽壓幾乎為零、遇熱不易分解、毒性和腐蝕性極低而被視為新型“綠色溶劑”,在萃取精餾領(lǐng)域有極大應(yīng)用前景。離子液體作為萃取劑的萃取精餾研究能夠?yàn)楣I(yè)上的萃取劑選擇、分離操作優(yōu)化、節(jié)能環(huán)保等方面提供有效指導(dǎo)。本文遴選兩種離子液體：1,3-二甲基咪唑二甲酯磷酸鹽([MMIM]DMP)和1-辛基-3-甲基咪唑四氟硼酸鹽([OMIM]BF4)分別作為分離乙醇-甲乙酮體系待選萃取劑進(jìn)行萃取精餾研究。1.實(shí)驗(yàn)在常壓(101.3kPa)下使用改進(jìn)的Othmer汽液平衡釜測(cè)定了乙醇-甲乙酮二元體系及分別加入不同濃度離子液體([MMIM]DMP、 [OMIM]BF4)的三元體系等壓汽液平衡數(shù)據(jù)T,x,y。實(shí)驗(yàn)結(jié)果顯示：離子液體作用于乙醇-甲乙酮共沸體系能夠造成汽液平衡曲線相對(duì)于原二元體系曲線的偏離,且偏離程度隨離子液體濃度的提高而增大。離子液體可以改變組分之間的相對(duì)揮發(fā)度,在足夠濃度下打破共沸。對(duì)比兩種離子液體的實(shí)驗(yàn)結(jié)果可以發(fā)現(xiàn)：[MMIM]DMP的分離能力強(qiáng)于[OMIM]BF4。2.本文利用NRTL和eNRTL方程對(duì)實(shí)驗(yàn)測(cè)得的汽液平衡數(shù)據(jù)進(jìn)行熱力學(xué)模型研究。其中,NRTL模型關(guān)聯(lián)兩種含離子液體([MMIM]DMP、[OMIM]BF4)體系的活度系數(shù)平均相對(duì)偏差分別為1.94%和2.59%。eNRTL模型關(guān)聯(lián)兩種含離子液體([MMIM]DMP、 [OMIM]BF4)體系的活度系數(shù)平均相對(duì)偏差分別為3.08%和4.55%。NRTL模型對(duì)于該體系的準(zhǔn)確性更高。3.進(jìn)行乙醇-甲乙酮-[MMIM]DMP體系的萃取精餾實(shí)驗(yàn),得到塔頂產(chǎn)品組成隨時(shí)間變化曲線及在不同回流比R、萃取劑進(jìn)料速率等操作條件下的塔頂產(chǎn)品組成。實(shí)驗(yàn)結(jié)果表明：回流比R等于3,萃取劑[MMIM]DMP在常溫下進(jìn)料、進(jìn)料速率為8mL·min-1,塔頂甲乙酮的質(zhì)量分?jǐn)?shù)可以達(dá)到99.0%。4.將乙醇-甲乙酮-[MMIM]DMP的NRTL方程參數(shù)輸入到Aspen Plus軟件中,進(jìn)行以萃取精餾模擬優(yōu)化。利用靈敏度分析考察塔頂產(chǎn)品組成在如不同回流比R、萃取劑進(jìn)料位置等操作條件下的所受影響,并對(duì)溫度及汽液相組成的分布等塔內(nèi)情況進(jìn)行分析。模擬結(jié)果和實(shí)驗(yàn)接近,數(shù)據(jù)可作為日后工業(yè)化生產(chǎn)的參考依據(jù)。
[Abstract]:Ethanol and methyl ethyl ketone are two commonly used organic compounds in industry. The azeotrope can be formed between them at normal pressure, so they can not be separated by ordinary distillation after mixing. The ionic liquids have low melting point and almost zero saturated vapor pressure. It is regarded as a new kind of "green solvent" because of its low toxicity and low corrosion, and it has great application prospect in the field of extractive distillation. The study of extractive distillation with ionic liquid as extractant can be used as a choice of extractant in industry. Separation operation optimization, In this paper, two kinds of ionic liquids: 1: 1, 3-dimethyl imidazole dimethyl ester phosphate ([MMIM] DMP) and 1-octyl-3-methyl imidazolium tetrafluoroborate salt ([OMIM] BF4) are selected for separation of ethanol-methyl ethyl ketone system. The solvent was used to extract distillation. 1. The binary system of ethanol-methyl ethyl ketone and the ternary system with different concentrations of ionic liquids ([MMIM] DMP, [OMIM] BF4) were determined by using an improved Othmer vapor-liquid equilibrium kettle under atmospheric pressure of 101.3kPa. the isobaric vapor-liquid equilibrium data were measured. The experimental results show that ionic liquid acting on ethanol-methyl ethyl ketone azeotropic system can cause the deviation of vapor-liquid equilibrium curve from that of the original binary system. The degree of deviation increases with the increase of ionic liquid concentration. Ionic liquids can change the relative volatilization between components. It is found that the separation ability of [MMIM] DMP is stronger than that of [OMIM] BF4.2. In this paper, the thermodynamic model of Vapor-Liquid equilibrium data measured in the experiment is studied by using NRTL and eNRTL equations. The average relative deviation of activity coefficients of two ionic liquids ([MMIM] DMP, [OMIM] BF4) system is 1.94% and that of 2.59%.eNRTL model is 3.08% for two ionic liquids ([MMIM] DMPand [OMIM] BF4) respectively. The extraction distillation experiments of ethanol-methyl ethanone-[ MMIM] DMP system were carried out. The curve of the top product composition with time was obtained, and the top product composition of the tower was obtained under the operating conditions of different reflux ratio R and the feed rate of the extractant. The experimental results showed that the reflux ratio R was equal to 3, and the extraction agent [MMIM] DMP was fed at room temperature. The feed rate is 8mL min-1, and the mass fraction of methyl ethanone can reach 99.0.4.The parameters of NRTL equation of ethanol-methylacetone-[ MMIM] DMP are input into Aspen Plus software. By using sensitivity analysis, the influence of the top product composition on the operation conditions such as the different reflux ratio, the feed position of the extractant, and so on, was investigated by means of the simulation optimization of extractive distillation, and the sensitivity analysis was used to investigate the influence of the product composition. The simulation results are close to the experimental results, and the data can be used as a reference for industrial production in the future.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ028.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前5條

1 李群生;付永泉;朱煒;王海川;李侖;;UNIFAC關(guān)聯(lián)甲醇-碳酸二甲酯汽液平衡[J];化工進(jìn)展;2011年S1期

2 崔現(xiàn)寶,楊志才,馮天揚(yáng);萃取精餾及進(jìn)展[J];化學(xué)工業(yè)與工程;2001年04期

3 石家華,孫遜,楊春和,高青雨,李永舫;離子液體研究進(jìn)展[J];化學(xué)通報(bào);2002年04期

4 朱登磊;譚超;任根寬;;基于Aspen plus萃取精餾的概念設(shè)計(jì)及優(yōu)化[J];計(jì)算機(jī)與應(yīng)用化學(xué);2010年06期

5 李群生;黃小僑;張繼國(guó);王寶華;倪健;;乙酸乙酯-乙醇-1-辛基-3-甲基咪唑四氟硼酸鹽物系汽液平衡數(shù)據(jù)的測(cè)定[J];石油化工;2009年11期

相關(guān)碩士學(xué)位論文 前1條

1 楊青;促進(jìn)乙腈水溶液分離的離子液體設(shè)計(jì)與實(shí)驗(yàn)研究[D];華東理工大學(xué);2014年

，

本文編號(hào)：1700164