摘要
C5和顺酐反应合成粗甲基四氢苯酐是生产甲基四氢苯酐及甲基六氢苯酐的关键步骤。为了研究C5中间戊二烯与顺酐反应动力学,选择合适溶剂并设计单因素多水平方案,考察了顺酐与间戊二烯摩尔比(0.4—1.1)、反应温度(15—45℃)、溶剂(甲基四氢苯酐、甲苯和丙酮)等因素对反应的影响,测定了间戊二烯与顺酐反应的动力学数据。依据Diels-Alder反应的基本原理,建立了动力学模型。利用数值计算方法对实验数据进行线性拟合,分别得到了以甲基四氢苯酐、甲苯和丙酮为溶剂时的活化能和指前因子,结果表明反应符合二级反应。不同溶剂对反应的活化能影响较小,对指前因子影响较大,其中以甲基四氢苯酐为溶剂时的反应活化能和指前因子为最大。
The reaction of C5 and maleic anhydride to synthesize crude methyltetrahydrophthalic anhydride（MTHPA） is a key step in the production of MTHPA and methylhexahydrophthalic anhydride（MHHPA）.The reaction kinetics of piperylene and maleic anhydride under the appropriate solvent was studied.Single-factor multilevel experiment was conducted to show the effects of the initial mole ratio（0.4-1.1）of maleic anhydride to piperylene,reaction temperature（15-45 ℃）,and solvents（MTHPA,toluene and acetone）on the reaction,and the kinetics data of piperylene and maleic anhydride reaction was determined.Based on the basic mechanisms of Diels-Alder reaction,a kinetics model was established.By regressing experimental data to a linear fitting based on numerical calculation method,the activation energy and pre-exponential factor were obtained with methyl tetrahydrophthalic anhydride,toluene and acetone as solvents.The results show that the reaction process accords with second-order reaction;different solvents have little influence on activation energy,but have great influences on the pre-exponential factor,in which the activation energy and pre-exponential factor approach the highest values when MTHPA is used as solvent.
出处
《化学工程》
CAS
CSCD
北大核心
2011年第7期51-55,共5页
Chemical Engineering(China)
