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Abstract(s)
O trabalho tem como objectivo a simulação e verificação do funcionamento de 3
colunas de destilação, a T-0303, a T-0306 e a T-0307, integrantes do processo de produção
de p-xileno, baseado nos dados relativos ao ano de 2008, existente na refinaria da Galp no
Porto.
A abordagem consistiu em utilizar o AspenPlus quer para a simulação quer para a
optimização, sendo esta última complementada com um planeamento experimental e
optimização no Minitab15.
O critério de optimização foi estabelecido a partir de uma análise ao processo actual,
na qual se averiguou que se poderia, no limite: produzir mais 15,30ton.ano-1 de p-xileno no
conjunto de colunas T-0306 e T-0307; remover mais 1,36ton.ano-1 de dessorvente na coluna
T-0303 e diminuir a energia necessária para o processo.
Da optimização à coluna T-0303, obteve-se uma melhoria de remoção de
0,34ton.ano-1 de dessorvente, e uma diminuição na energia necessária para 333,24.106kWh
por ano. Para obter esta optimização houve necessidade de ultrapassar em 109,852kW a
potência da bomba P0306A/S e alterou-se a razão de refluxo na base para 46,1.
A optimização conjunta das colunas T-0306 e T-0307 apenas possibilita uma
melhoria de p-xileno de 3,4ton.ano-1.
De uma optimização individual da coluna T-0307, mantendo a coluna T-0306 nas
condições actuais, obteve-se uma melhoria na produção de p-xileno de 14,62ton.ano-1.
Neste ensaio as potências do condensador E-0314, do reebulidor E-0306 e da bomba
P0314A/S excedem, as actuais em, respectivamente, 35,71kW, 35,74kW e 0,12kW.
Enquanto para a situação actual o custo de p-xileno equivale a 722,17€.ton-1, para a
optimização simultânea da coluna T-0303 e T-0307, é de 723,39€.ton-1 e para a optimização
de apenas da coluna T-0307 é de 722,81€.ton-1. Perante um preço de venda actual de pxileno
de 749,10€.ton-1 todas as situações são favoráveis.
Em suma, é possível uma optimização processual mas o custo por tonelada de pxileno
fica superior ao actual.
The objective of this paper is the simulation and verification of the performance of 3 distillation columns T-0303, T-0306 and T-0307 of a p-xylene production process, based upon 2008 data of Galp´s refinery of Porto. The AspenPlus application was used on its simulation as well as on its optimisation being this last one complemented with experimental design and optimisation using Minitab15 application. An optimisation criterion was established after an analysis of the present process which gave as maximum limits an extra production of 15,30ton.year-1 of p-xylene, considering both columns T-0306 and T-0307, an extra removal of 1,36ton.year-1 of desorbent and reduction of energy for the process. From the optimisation of column T-0303 an extra desorbent removal of 0,34ton.year-1 was attained as well as an energy reduction to 333,24x106kWh.year-1. To attain this optimisation it was necessary to increase the power of pump P0306A/S in 109,852kW and to move the base reflux to the value of 46,1. The joint optimisation of columns T-0306 and T-0307 resulted in just an increase of 3,4ton.year-1 of p-xylene production. From an individual optimisation of column T-0307, keeping T-0306 conditions, an increase of 14,62ton/year production of p-xylene was attained. To attain this optimisation it was necessary to increase the power of condenser E-0314, reeboiler E-0306 and pump P0314A/S in, respectively, 35,71kW, 35,74kW and 0,12kW. The cost of present p-xylene production is 722,17€.ton-1, for a joint optimisation of columns T-0306 and T-0307 is 723,39€.ton-1 and for an optimisation of just column T-0307 is 722,81€.ton-1. Considering present p-xylene sale price of 749,10€.ton-1, all situations are acceptable, although present situation is the best. In conclusion, it is possible to optimise the process but cost of p-xylene stays over the present one.
The objective of this paper is the simulation and verification of the performance of 3 distillation columns T-0303, T-0306 and T-0307 of a p-xylene production process, based upon 2008 data of Galp´s refinery of Porto. The AspenPlus application was used on its simulation as well as on its optimisation being this last one complemented with experimental design and optimisation using Minitab15 application. An optimisation criterion was established after an analysis of the present process which gave as maximum limits an extra production of 15,30ton.year-1 of p-xylene, considering both columns T-0306 and T-0307, an extra removal of 1,36ton.year-1 of desorbent and reduction of energy for the process. From the optimisation of column T-0303 an extra desorbent removal of 0,34ton.year-1 was attained as well as an energy reduction to 333,24x106kWh.year-1. To attain this optimisation it was necessary to increase the power of pump P0306A/S in 109,852kW and to move the base reflux to the value of 46,1. The joint optimisation of columns T-0306 and T-0307 resulted in just an increase of 3,4ton.year-1 of p-xylene production. From an individual optimisation of column T-0307, keeping T-0306 conditions, an increase of 14,62ton/year production of p-xylene was attained. To attain this optimisation it was necessary to increase the power of condenser E-0314, reeboiler E-0306 and pump P0314A/S in, respectively, 35,71kW, 35,74kW and 0,12kW. The cost of present p-xylene production is 722,17€.ton-1, for a joint optimisation of columns T-0306 and T-0307 is 723,39€.ton-1 and for an optimisation of just column T-0307 is 722,81€.ton-1. Considering present p-xylene sale price of 749,10€.ton-1, all situations are acceptable, although present situation is the best. In conclusion, it is possible to optimise the process but cost of p-xylene stays over the present one.
Description
Keywords
p-xileno Simulação Optimização AspenPlus Planeamento experimental p-xylene Simulation Optimization AspenPlus Experimental design
Citation
Publisher
Instituto Politécnico do Porto. Instituto Superior de Engenharia do Porto