Abstract

The process of dehydrating ethanol to ethylene by varying geometrical dimensions of a ring-shaped alumina catalyst is studied using a mathematical 2D model of a multitubular reactor. The set of ring sizes determines equivalent grain size R_eq, on which catalyst’s effectiveness factor η depends in turn. A procedure is proposed for assigning grains with different geometric dimensions to four structural groups, depending on the technique used to synthesize samples with the same equivalent size R_eq. Based on this approach, a system of criteria is developed for selecting catalyst grains with the best characteristics for given conditions. The geometric sizes of grains and other parameters that ensure the highest ethylene yield at the lowest values of the pressure drop and the residence time are determined.

中文翻译：

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环状氧化铝催化剂上多管反应器中乙醇脱水制乙烯过程的数学模型

摘要

使用多管反应器的数学二维模型研究了通过改变环形氧化铝催化剂的几何尺寸将乙醇脱水为乙烯的过程。一组环尺寸确定等效的晶粒尺寸R _eq，催化剂的有效因子η依次取决于该等效晶粒尺寸。根据合成等当量尺寸R _eq的技术，提出了一种将具有不同几何尺寸的晶粒分配到四个结构组的程序。基于这种方法，开发了一种标准系统，用于在给定条件下选择具有最佳特性的催化剂颗粒。确定晶粒的几何尺寸和其他参数，以确保在最低的压降和停留时间下获得最高的乙烯收率。