The Simulation Of Separation 1,4-butanediol And Recovering Of By-products

1,4-butanediol(simpled as BDO),is a fine chemical product with high added value.This paper used Aspen Plus process simulation software to simulate and optimize the separation of BDO and the recovery of by-product-n-butanol,At first,the equilibriLum method is taken into consideration of separation the BDO with its by-products.The results are consitent with the rate-based.For the separation of BDO,the maximum flooding factor of the 1#tower is 0.68,the pressure drop at the tower section is 0.10 bar,and the height of the liquid layer/board spacing is 0.26.For the 2#tower,the maximum flooding factor is 0.46,the tower pressure drop is 0.06 bar,and the clear layer height/plate spacing is 0.22.For n-butanol recovery,the maximum flooding factor for the T1 column is 0.61<0.8,the pressure drop at the column section is 0.17 bar,and the height of the supernatant layer/plate spacing is 0.27.For the 2#tower,the maximum flooding factor is 0.68,the pressure drop at the tower section is 0.10 bar,and the height of the liquid layer/plate spacing is 0.31.In addition,the actual data and simulated data are compared within 3%,so the simulation results are reliable.Secondly,a novel separation scheme is proposed,which is separation of intermediate products before hydrogenation.The preliminary simulation results were obtained.The optimization of the simulation results as follows:for the low-temperature tower,the pressure is 0.12 Mpa,the reflux ratio is 1,the feed position is 10 to 12 trays,and the distillate rate is 4500 kg/h.For the high temperature tower,the feed position is 8 to 10,the tower pressure is 0.12 Mpa at reflux ratio 1 by the production rate of 500 kg/h.At last,distillation tower is designed and verified to meet the requirements.