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Study On Solubility And Combustion Side Reaction Of Liquid Phase Oxidation Of M-xylene

Posted on:2017-02-06Degree:MasterType:Thesis
Country:ChinaCandidate:B LiFull Text:PDF
GTID:2311330512970267Subject:Chemical engineering
Abstract/Summary:PDF Full Text Request
Isophthalic acid is a very important and promising chemical raw material, which is mainly produced by M-xylene high temperature liquid phase oxidation process. In this article, some physical properties of the oxidation process and the combustion side reaction were studied, and the MX oxidation reactor mathematical model was established.Steady-state method was applied to determine the solubility of m-methyl benzoic acid and isophthalic acid in different acetic acid water solution, Apelblat equation was used to describe the solubility and the parameters were gained, Van't Hoff was used to calculated related thermodynamic parameters, and the ?h equation model was used to calculate crystalline heat of isophthalic acid according to the solubility data.In a semi continuous experimental device, the effects of reaction temperature, reactant concentration, catalyst concentration, catalyst ratio and water content on the M-xylene oxidation combustion reaction were carried out, the results showed that with the increase of reaction temperature, increase of M-ylene concentration, increase of the catalyst concentration, increase of Co/Mn and Co/Br ratio, decrease of the water content, combusting reaction showed out a trend of increasing; COX formation mechanism was proposed, CO, CO2 generation rate equation under different temperature and catalyst conditions was obtained when combined with the main reaction kinetic model;M-ylene oxidation reactor mathematical model equations which were made up of the kinetic equation, mass balance equation, heat balance equation and the phase equilibrium equation were established. The model was calibrated with the actual production plant, the results showed that the model has good accuracy and predictability.
Keywords/Search Tags:Isophthalic Acid, Solubility, Crystallization Heat, Side reaction Kinetics, Reactor Model
PDF Full Text Request
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