Process Design Of Aromatization Mobile Bed For Producing 100000 Tons Of Aromatic Methanol Per Year

Aromatic hydrocarbons,as the most basic raw materials in organic chemical industry,have been favored by countries all over the world.At present,the production of aromatic hydrocarbons mostly takes the petroleum route,while China has the energy structure of"more coal,less oil and poor gas".Using methanol aromatization technology to develop the coal route to prepare aromatic hydrocarbons can not only reduce China’s dependence on petroleum,but also alleviate the current energy crisis facing China.According to the study consequences of methanol aromatization laboratory for decades,the process design of 100000 t/a aromatic methanol aromatization moving bed is carried out in this paper.Firstly,the methanol aromatization process flow chart was constructed according to the laboratory data of methanol aromatization reaction.The methanol aromatization process was divided into three stages:methanol feeding,aromatization reaction and materials’separation,and it’s acted by Aspen Plus software to simulate and calculate of each stage.Secondly,the mathematical model of methanol aromatization moving bed reactor was established by combining the lumped kinetic model of methanol aromatization with the one-dimensional quasi homogeneous reactor model.The equation solutions were found by fourth-order Runge Kutta method using MATLAB software,and the bed diameter was 2.22 m,the reactor height was13 m,and the bed movement velocity was 2.12×10^-5m/s.Aspen Plus software was used to simulate and optimize the methanol initialization reactor.The influence of feed temperature and feed methanol content on the reaction was explored,and the optimal feed temperature of the reactor was determined to be350℃and the optimal feed methanol content was 100%.Under the optimized conditions,the yield of aromatics can reach 22.91%and the annual yield of aromatics can reach 114,000 tons,it can meet the need of manufacture in industry.Finally,the separation equipment is designed.The horizontal three-phase separator was selected for the three-phase separator.The size of the separator was determined by the half-full method.The diameter of the separator was2800mm,the length was 12.65 m,and the aspect ratio was 4.52.To decorate the separation tower,making use of Aspen Plus to make simulations,analysis and optimization on the tower,and the calculation of process design and process checking of separation tower were conducted according to the optimized results.The separation towers designed in this paper mainly include the tower that removes pentane,the tower that removes C₆and methylbenzene,the tower that removes benzene,the tower that removes methylbenzene and the tower that removes C₈.