Optimization Of Crude Benzene Hydrorefining Process

Up to now,90% of the crude benzol refining production lines that have been put into use are coking and hydrogenation of crude benzol to achieve the purpose of crude benzol purification.There are many ways of coking and hydrogenation.The production processes adopted by each country or chemical group are different,and the various methods are quite different.Comparing the coking and hydrogenation modes that have expired at present,we can find that the coking and hydrogenation modes adopted in China are relatively complex and require less funds.Therefore,the coking and hydrogenation modes in China now account for a large proportion in coal chemical production.Although the coking and hydrogenation mode in China is low in complexity and needs less funds,it also has some shortcomings.This paper puts forward some optimization measures for its shortcomings,including the optimization of production process and equipment,and the optimized production process and equipment can meet the actual engineering needs of crude benzol refining.The evaporator device in crude benzol refining process is always blocked in practical engineering application,so this paper optimizes its production system,and the blockage problem of the optimized evaporator device is improved.In order to solve the problem of blockage in liquid phase circulation process,the vacuum part of the pre-treatment module was optimized.The optimized liquid circulation process can also avoid blockage without continuously emptying the liquid in the module and then replenishing the liquid in the module.The number of pretreated fractionator was analyzed and calculated by Aspen,a numerical calculation software of chemical process.The separation effect of hydrotreated feed oil was also analyzed and calculated.The numerical simulation results show that the number of pretreated fractionators can enhance the separation effect.In the process of solvent recycling,replacing the empty tower in the original production process with stripper with inner packing in the tower can better guarantee the quality of coking and hydrogenation feed oil.In order to stabilize the acidity and alkalinity of liquids in the production process,the monoethanolamine used in the extractive distillation process can be replaced by potassium acetate.Under the condition of guaranteeing the start-up rate of crude benzol refining production process,proper optimization of production process and equipment in coking and hydrogenation mode can greatly reduce production costs and enhance the competitiveness of products.Based on the principle of orthogonal experiment,the basic parameters of coking and hydrogenation in crude benzol refining process were optimized in accordance with the reaction principle of the corresponding production process.The production process of hydrogenation section and refinement section was optimized,and the operation parameters of the whole part were re-calibrated.By optimizing the production process of hydrogenation and refining section and re-calibrating the operation parameters,the energy consumption can be reduced by about 20% compared with the original process.According to the feedback results of the actual use of the project,the optimized production process can reduce the steam consumption by 0.24 t/h compared with the original production process,and the production cost of the whole process can be reduced by about 368,000 yuan per year.On the basis of optimization,this paper puts forward some universally applicable operation methods,as well as the corresponding changes of various monitoring parameters,which can provide some reference for engineering designers and factory producers.