【作者】 曲宇霞；

【导师】 周明；

【作者基本信息】 天津大学 ， 化学工程， 2004， 硕士

【摘要】 浆料催化精馏是近年来发展起来的一种新型催化精馏工艺。此工艺所用的催化剂为粒径很小的微粒或超微颗粒,催化剂与液相形成浆料在塔内流动,并循环使用。本文采用平均粒径为4μm的酸性阳离子交换树脂作催化剂,在内径为76mm的常压玻璃复合塔内,对浆料催化精馏制备醋酸甲酯进行了实验研究。考察了催化剂浓度、回流比、进料酸醇摩尔比和进料总流量等条件对浆料催化精馏过程的影响。实验结果表明:提高催化剂浓度,醋酸甲酯收率和塔顶醋酸甲酯的纯度均增加; 提高进料酸醇摩尔比也会提高醋酸甲酯收率; 进料总流量对醋酸甲酯收率的影响十分明显,进料总流量减少可以使醋酸甲酯的收率得到明显提高; 回流比对醋酸甲酯收率和塔顶醋酸甲酯纯度的影响不同于一般的精馏过程,存在一个最优的回流比,本过程最佳回流比在1-2之间。采用平衡级模型,应用Aspen Plus软件对实验过程及各操作参数对过程的影响进行模拟,模拟结果与实验结果吻合的较好。结果揭示了过程各参变量在塔中的变化规律,为工艺及塔的设计提供依据。最后,对浆料催化精馏工艺在酯化工业中的应用前景进行了探讨。与普通的催化精馏相比,浆料催化精馏具有不需要制作催化剂元件、不需要停车更换催化剂、不需要固液分离、催化剂效率高和易于工业化生产等优点,具有很好的研究与开发的前景。更多还原

【Abstract】 Slurry catalytic distillation is a novel catalytic distillation process developed in recent years. The fine catalyst particles are mixed with liquid phase to form slurry which flows down in the column and recycles between the reactive distillation column and catalyst recovery column. In this paper, the slurry catalytic distillation process was experimentally studied on the esterification of glacial acid by methanol. The experiments were carried out in a glass column with an inner diameter of 76 and the catalyst was acidic ion-exchange resin about 4mmμ m in diameter. The effects of catalyst concentration, reflux ratio, feed mole ratio of glacial acid to methanol and total feed flow on the process were experimentally investigated. The experiment results indicate that: the increases of catalyst concentration, feed mole ratio of glacial acid to methanol and the decrease of total feed flow can increase the yield of methyl acetate; the concentration of methyl acetate in distillate also increases with the increase of catalyst concentration; that the effects of reflux ratio on the yield and concentration of methyl acetate in distillate are different from conventional distillation process, an optimal value of reflux ratio exists between 1 and 2 for this process. Based on equilibrium stage model, the experiment processes and the effects of operation parameters on process were simulated by using Aspen Plus software. The simulation results show that the calculated results agree satisfactorily with the experiment data, and provide also the basis for designing process and column of slurry catalytic distillation. Compared with conventional catalytic distillation, slurry catalytic distillation holds more advantages, such as: simpler column structure, easier to operate and control, higher efficiency of reaction and separation, more suitable to large scale production, etc. The slurry catalytic distillation process is worth researching and developing.更多还原