Simulation And Optimization Of MTBE Production And Desulfurization Equipment

With the continuous development of China's refining technology,its by-product of a large number of low-carbon hydrocarbons such as ether carbon four has not yet been rational use.A number of ether carbon four are also mainly burned as a civilian fuel in China.Methyl tert-butyl ether(MTBE)devices effectively utilize carbon tetra-feed to produce high purity MTBE for increasing the octane number of gasoline.The high sulfur content in the MTBE is also high because of the ether carbon four.As the national mandatory standards in the provisions of the vehicle gasoline sulfur content of not more than 10?g/g,so MTBE sulfur content should be reduced to 10?g/g below as a chemical raw material production,which has become an urgent problem need to solve in the petrochemical enterprises.This paper solves the problem of low purity of MTBE in a manufacturing enterprise,saving the production cost of the enterprise and making the sulfur content in MTBE meet the industrial production standard.In this paper,Aspen Plus process simulation software was used to select the different thermodynamic model to simulate the theoretical equipment of etherification reactor,catalytic distillation column,methanol extraction column and recovery column in the production process of MTBE.And the theoretical energy consumption of the distillation column and the methanol recovery tower of the reflux ratio,operating pressure are optimized.The simulation results are compared with the actual production values,and the accuracy of the thermodynamic model is verified,and the optimized results are compared with the previous results.After the simulation,the thermal load of the catalytic distillation column is reduced by 25.4% and the thermal load of the methanol recovery column is reduced by 51.84%.The mass fraction of the product MTBE is optimized to reach 99.17% after the simulation,which satisfies the production requirement.Meanwhile the economic analysis of MTBE device before and after optimization is carried out.The energy consumption per hour each treatment of a ton of material can save ?764.8,annual savings of about 612 million after optimization of the catalytic distillation column.And the energy consumption per hour each treatment of a ton of materialcan save ?1455.504,annual savings of about 1164 milliona after optimization of the methanol recovery column,enterprise energy costs have been greatly saved after optimization.The desulphurization process of MTBE was simulated and optimized by single column and two columns.The newly developed two columns desulfurization process was compared with the traditional single column desulphurization process.The results show that both processes can reduce the sulfur content of MTBE products to below 10?g/g,but the effect of desulphurization is much better than that of single column desulfurization,and the yield of methyl tert-butyl ether is 99.91 %.Two columns desulfurization process because the addition of a stripper,so the equipment costs and energy consumption should be higher than the single column desulfurization process,so you can according to the different needs of enterprises using different desulfurization process.The research results of this paper can be used to improve the MTBE production process package data of the oil refining enterprises and have certain guiding significance to the MTBE desulfurization process.