本文主要研究内容
作者夏成康（2019）在《1-磺酸丁基-2-甲基吡啶硫酸氢盐离子液体催化酯化反应精馏制备乙酸乙酯的研究》一文中研究指出：乙酸乙酯是一种十分常见的工业试剂,在涂料等领域有着十分重要的作用。现阶段在制作乙酸乙酯的传统工艺中,传统的均相催化剂浓硫酸价格低廉,工艺成熟,但引起的副反应较多,同时还存在腐蚀性强等问题。固体酸催化剂有着便于分离回收,便于化工连续操作等优点,但是该催化剂在较低反应温度下活性很低,在较高反应温度下容易失活及寿命较短等缺点。离子液体作为一种新型的液体催化剂,有着优良的催化性能,且腐蚀性不高,在酯化反应领域具有极大的潜力。本文以1-磺酸丁基-2-甲基吡啶硫酸氢盐离子液体作为催化剂,系统研究其对乙酸和乙醇酯化反应合成乙酸乙酯的动力学性能。在温度为313.15-333.15 K,催化剂浓度在0.07-0.27 mol·L-1、酸醇摩尔比为0.56-1.5的条件下,考察各因素对反应转化率的影响。根据二级可逆反应机理建立酯化反应动力学的非理想均相(NIH)模型,并采用NRTL活度方程修正混合液体的非理想性质。通过动力学数据拟合获得模型中的动力学常数、反应活化能和指前因子等参数。随着温度和离子液体催化剂浓度上升,乙酸的反应速率逐渐增大,但平衡转化率基本不变,酸醇摩尔比为1时酯化反应的转化率最高。正反应活化能为49.48 kJ·mol-1,负反应活化能为53.78 kJ·mol-1;正指前因子为7.25×105 L2·mol-2·min-1,负指前因子为3.87×105 L2·mol-2·min-1。结果表明模型预测值与实验值一致,说明了NIH模型适用于该离子液体催化乙酸乙酯反应动力学体系,可为后续反应精馏的模拟提供动力学数据。通过对比发现,同等条件下离子液体催化效果比离子交换树脂Amberlyst 15好,腐蚀性要低于浓硫酸。通过5次循环回收使用后,离子液体1-磺酸丁基-2-甲基吡啶硫酸氢盐的催化活性没有出现显著减小。说明该离子液体是性能比较突出的酯化反应催化剂。分析离子液体在反应精馏过程中的作用,用小式玻璃精馏装置在不同进料位置,进料量(初始酸醇摩尔比),摩尔回流比、持液量用量下测定了塔顶乙酸乙酯纯度。按照设备具体情况,当回流比为3,塔釜持液量为1L,催化剂质量占乙酸质量5%,进料酸醇摩尔比为1.3,乙酸从第3块板进料,乙醇从第10块板进料塔顶乙酸乙酯含量能够达到最高,为86.7%。采用Aspen Plus模拟软件对反应精馏实验情况实施模拟计算,所求出的乙酸乙酯质量分数和实验值之间误差要低于3%。并且模拟分析反应精馏时的最佳工艺条件回流比为2,酸醇摩尔比为1.3,乙酸进料流量为52 mol·h-1,乙醇进料流量为41 mol·h-1,乙醇第9块板进料,乙酸和催化剂在第三块板进料,塔板持液量为0.025 L,得到酯的含量为88.53%。
Abstract
yi suan yi zhi shi yi chong shi fen chang jian de gong ye shi ji ,zai tu liao deng ling yu you zhao shi fen chong yao de zuo yong 。xian jie duan zai zhi zuo yi suan yi zhi de chuan tong gong yi zhong ,chuan tong de jun xiang cui hua ji nong liu suan jia ge di lian ,gong yi cheng shou ,dan yin qi de fu fan ying jiao duo ,tong shi hai cun zai fu shi xing jiang deng wen ti 。gu ti suan cui hua ji you zhao bian yu fen li hui shou ,bian yu hua gong lian xu cao zuo deng you dian ,dan shi gai cui hua ji zai jiao di fan ying wen du xia huo xing hen di ,zai jiao gao fan ying wen du xia rong yi shi huo ji shou ming jiao duan deng que dian 。li zi ye ti zuo wei yi chong xin xing de ye ti cui hua ji ,you zhao you liang de cui hua xing neng ,ju fu shi xing bu gao ,zai zhi hua fan ying ling yu ju you ji da de qian li 。ben wen yi 1-huang suan ding ji -2-jia ji bi ding liu suan qing yan li zi ye ti zuo wei cui hua ji ,ji tong yan jiu ji dui yi suan he yi chun zhi hua fan ying ge cheng yi suan yi zhi de dong li xue xing neng 。zai wen du wei 313.15-333.15 K,cui hua ji nong du zai 0.07-0.27 mol·L-1、suan chun ma er bi wei 0.56-1.5de tiao jian xia ,kao cha ge yin su dui fan ying zhuai hua lv de ying xiang 。gen ju er ji ke ni fan ying ji li jian li zhi hua fan ying dong li xue de fei li xiang jun xiang (NIH)mo xing ,bing cai yong NRTLhuo du fang cheng xiu zheng hun ge ye ti de fei li xiang xing zhi 。tong guo dong li xue shu ju ni ge huo de mo xing zhong de dong li xue chang shu 、fan ying huo hua neng he zhi qian yin zi deng can shu 。sui zhao wen du he li zi ye ti cui hua ji nong du shang sheng ,yi suan de fan ying su lv zhu jian zeng da ,dan ping heng zhuai hua lv ji ben bu bian ,suan chun ma er bi wei 1shi zhi hua fan ying de zhuai hua lv zui gao 。zheng fan ying huo hua neng wei 49.48 kJ·mol-1,fu fan ying huo hua neng wei 53.78 kJ·mol-1;zheng zhi qian yin zi wei 7.25×105 L2·mol-2·min-1,fu zhi qian yin zi wei 3.87×105 L2·mol-2·min-1。jie guo biao ming mo xing yu ce zhi yu shi yan zhi yi zhi ,shui ming le NIHmo xing kuo yong yu gai li zi ye ti cui hua yi suan yi zhi fan ying dong li xue ti ji ,ke wei hou xu fan ying jing liu de mo ni di gong dong li xue shu ju 。tong guo dui bi fa xian ,tong deng tiao jian xia li zi ye ti cui hua xiao guo bi li zi jiao huan shu zhi Amberlyst 15hao ,fu shi xing yao di yu nong liu suan 。tong guo 5ci xun huan hui shou shi yong hou ,li zi ye ti 1-huang suan ding ji -2-jia ji bi ding liu suan qing yan de cui hua huo xing mei you chu xian xian zhe jian xiao 。shui ming gai li zi ye ti shi xing neng bi jiao tu chu de zhi hua fan ying cui hua ji 。fen xi li zi ye ti zai fan ying jing liu guo cheng zhong de zuo yong ,yong xiao shi bo li jing liu zhuang zhi zai bu tong jin liao wei zhi ,jin liao liang (chu shi suan chun ma er bi ),ma er hui liu bi 、chi ye liang yong liang xia ce ding le da ding yi suan yi zhi chun du 。an zhao she bei ju ti qing kuang ,dang hui liu bi wei 3,da fu chi ye liang wei 1L,cui hua ji zhi liang zhan yi suan zhi liang 5%,jin liao suan chun ma er bi wei 1.3,yi suan cong di 3kuai ban jin liao ,yi chun cong di 10kuai ban jin liao da ding yi suan yi zhi han liang neng gou da dao zui gao ,wei 86.7%。cai yong Aspen Plusmo ni ruan jian dui fan ying jing liu shi yan qing kuang shi shi mo ni ji suan ,suo qiu chu de yi suan yi zhi zhi liang fen shu he shi yan zhi zhi jian wu cha yao di yu 3%。bing ju mo ni fen xi fan ying jing liu shi de zui jia gong yi tiao jian hui liu bi wei 2,suan chun ma er bi wei 1.3,yi suan jin liao liu liang wei 52 mol·h-1,yi chun jin liao liu liang wei 41 mol·h-1,yi chun di 9kuai ban jin liao ,yi suan he cui hua ji zai di san kuai ban jin liao ,da ban chi ye liang wei 0.025 L,de dao zhi de han liang wei 88.53%。
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论文作者分别是来自广西大学的夏成康，发表于刊物广西大学2019-10-14论文，是一篇关于离子液体论文,酯化论文,动力学模型论文,反应精馏论文,模拟论文,乙酸乙酯论文,催化论文,广西大学2019-10-14论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自广西大学2019-10-14论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：离子液体论文; 酯化论文; 动力学模型论文; 反应精馏论文; 模拟论文; 乙酸乙酯论文; 催化论文; 广西大学2019-10-14论文;