Energy-saving optimization and economic analysis of styrene production process
In the styrene production process self-developed by the Sinopec,the dehydrogenation of ethylbenzene requires a large amount of superheated steam as the dehydrogenation medium.The ratio of the steam to ethylbenzene flow rate is an important factor affecting the dehydrogenation reaction.With the industrial application of the low water ratio catalysts,the amount of the steam entering the reactor can be reduced.The key to reducing the water ratio is to reduce the azeotropic distillation of the ethylbenzene and steam from the top condenser of the ethylbenzene/styrene tower.After controlling the azeotropic evaporation,the heat carried by the top flow of the ethylbenzene/styrene tower cannot be fully recovered.In order to make reasonable use of the heat,the process was optimized and the heat was copled.The energy-saving optimization mainly involved 9 heat exchangers,of which 2 were added.In the optimization,the pressure of the pre separation tower was also reduced and the outlet temperature of the tail gas compressor increased.After optimizing,the integrated energy consumption can be reduced by 11.364 kg standard oil per ton styrene,and the static investment payback period is about 2 months.
styreneethyl-benzene dehydrogenationtail gas compressorfalling film evaporatorenergy-saving optimization
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