摘要
我国的能源结构是"富煤、贫油、少气",以煤基乙酸为原料制备燃料乙醇是适宜我国国情的工艺路线,燃料乙醇的研究越来越受到人们的关注。本文研究了贵金属催化剂上乙酸加氢还原制乙醇的反应。在反应温度(160～240)℃、反应压力(3～7)MPa、乙酸液相体积空速(0.3～0.7)h^(-1)、氢气与乙酸摩尔比5～22的条件下,在等温积分反应器中研究了乙酸加氢制乙醇的反应动力学,并考察了操作条件对乙酸转化率及乙醇选择性的影响。结果表明:随温度升高乙酸转化率和乙醇选择性均明显增加,在240℃时,乙酸转化率接近平衡转化率;增加反应压力,乙酸转化率及乙醇选择性随之增加;提高乙酸液相体积空速,乙酸转化率降低,乙醇选择性呈增加趋势。根据实验数据,应用参数估值方法,得到Langmuir-Hinshelwood型动力学模型中的参数,残差分析及统计检验表明,该动力学模型是适宜的。
Our country＇s energy structure is ＂rich in coal, oil-poor, less gas＂, thus it is suitable for us to develop the process of producing ethanol with coal and people pay more attention to fuel ethanol because of its higher octane and better anti-knock performance. This paper studied the reaction of acetic acid catalytic hydrogenation to ethanol with noble metal catalyst. Intrinsic kinetics of acetic acid hydrogenation to ethanol was studied in an isothermal reactor under the conditions of 160 ℃-240 ℃, 3 MPa-7 MPa, 0.3 h-1-0.7 h-1 of the volume space velocity of liquid acetic acid. The mole ratio of hydrogenation to acetic acid was from 5 ： 1 to 22 ： 1 .The effect of reaction conditions to the conversion of acetic acid and the selectivity to ethanol was discussed. The results indicated that higher conversion and selectivity could be obtained under the conditions of higher temperature and pressure, the conversion rate at 240 ℃ is close to the balance one; With the increase of the space velocity, the percent conversion dropped slowly while the selectivity had a trend to rise; The influence of the mole ratio was not obvious to the conversion, while improving the ratio was in favor of the formation of ethanol. The parameters involved the Langmuir-Hinshelwood model were got by the parameter estimation method on the basis of the experimental data. Residual error distribution and statistic test showed that the intrinsic kinetics was suitable and acceptable.
出处
《计算机与应用化学》
CAS
CSCD
北大核心
2012年第12期1438-1442,共5页
Computers and Applied Chemistry
关键词
乙酸
催化加氢
乙醇
动力学
acetic acid, catalytic hydrogenation, ethanol, kinetics
