Sequenciamento e integração energetica de colunas de destilação desproporcionamento do tolueno

AUTOR(ES)
DATA DE PUBLICAÇÃO

1999

RESUMO

This work s goal is to study the process of disproportionation oftoluene. lndustrially this process is composed of the units (i) reaction section, (ü) separation section and (iii) recycling section. The incline in the demand of benzene makes the separation section become potentially favourable to the reduction of processing costs. Therefore the orientation of this study is to reduce the total cost of the separation section of the products reaction performed by distillation. The tools used in the analysis of the problem are the synthesis methods and the sequential integration of the distillation columns. The first chapters presents the techniques often used in the synthesis and integration of columns: the heuristic methods (based on experiences from previous projects), the predictive equations, artificial intelligence and the approximate methods are mostly applied. During the integration, the ?Q?T and the non-linear programming are more relevant. The products from the disproportionation of toluene and subsequently from the columns feeding take place via different compositions. The computational method was selected as it offers the total cost of an established sequence of distillation, as well as the best possible forms of integration. The same procedure is done on sequences presenting lateral exits for their columns. Comparisons are performed among non-integrated sequences to obtain the most economic sequence. Finally the integration of these sequences is analysed and its results incorporated to previous data collected for the evaluation. This work includes the development of a simplified method for obtaining integrated sequences as well as the analysis of how feeding (components, volatility, flowing, etc) affects the choice of the best distillation sequence. This study also covers columns with lateral exit

ASSUNTO(S)

separação (tecnologia) destilação recuperação do calor processos quimicos

ACESSO AO ARTIGO

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