Nine-Lumped Kinetic Models ofLiquefied Petroleum Gas Under Aromatization Reaction Conditions

Abstract

Abstract The aromatization reaction of liquefied petroleum gas has been studied by using three liquefied petroleum gases as the raw material and LBO-A as the catalyst. Nine-lump kinetics model networks have been put forward on the basis of lumped theory and the aromatization reaction mechanism. In the network, the aromatization reaction species are firstly lumped into C4=, C40, n-paraffin, i-paraffin, olefins, aromatics, C2-3=, H2 + C1-30, and coke. A mathematical method is first introduced to study the product distribution of the liquefied petroleum gas aromatization reaction. The results from experimental data are in accordance with the quantitative analytical conclusions drawn from the calculated data. Introduction In 1994, 1.27 hundred million tons of petroleum were processed, more than 2.2 million tons of ethylene were produced, and the resources of liquefied petroleum gas (C4 fraction and C5 fraction) reached approximately 3.7 million tons in China(1,2). The resources of liquefied petroleum gas have become more and more abundant in China; the output of liquefied petroleum gas is more than 300 thousand tons per year(3,4). The resources of liquefied petroleum gas are mainly from three resources in China: oil and gas fields, refineries and from gas cracking(5). The resources of liquefied petroleum gas are not completely used to create higher value products, whereas most resources are burned as fuel(6). Recently, research work has focused mainly on how to use liquefied petroleum gas effectively(7,8). The various quantitatively analytical methods have been studied, but the lumped-kinetics models are seldom done. In this paper, nine-lumped kinetics models, which can predict aromatization reaction product distribution under various operating conditions and calculate the maximum deviations of the product yield between calculated results and practical values, are established for a confined fluidized bed reactor.