Research Of Engineering Technology In The Preparation Of Continuous Reforming Catalysts

Continuous reforming is the main process for the production of aromatics and high octane petrol and one of the most important technologies for oil refining and petrochemical industry. Preparation of excellent continuous reforming catalysts and developing new technology of preparation are the key problems. The preparation of continuous reforming catalysts includes dipping, activation, reduction. But there are some disadvantages in practical production process such as small production capacity, inequable metal-supported, low utilization, unreasonable structure of all baking furnace and limited accuracy of temperature control of gas-furnace. For this purpose, this paper studied the new application of rotated drying in preparation of catalyst, the improvement of high temperature bake and reduction, and the application of electric heating furnace.(1) Dipping is one of the most working procedure in the production of supported catalyst. The metal components could be adsorbed on supporter by dipping. The activity and selectivity of the catalyst were closely related to the uniformity and dispersion of loading metal. Therefore, the performance of reforming catalysts was depended on the effect of dipping. Taking RC011 catalyst as example, the properties of the catalysts prepared with dynamic dipping method such as the loading of metal components, metal dispersion, intensity, antiwear, the resistance ability of hydrothermal treatment, reacted activity, the composition of solution after dipping and the fluctuation of the supported metal were compared with the catalysts prepared with static dipping method. The results showed that the rotated drying dynamic dipping method had some advantages such as low cost, short period, easy operation and maintenance.(2) The acid mist produced in calcination and elimination of acid would bring strong corrosion to baking furnace, chimney and active room. So, to ensure constant temperature, the length of charge pipe increased by 1.5 m, the length of reactor constant temperature zone and preheating section increased by 0.5 m and 1.0 m, respectively. This technology showed as follows:①the pressure distribution of each section of material layer was more reasonable, airflow resistance was small, the trail gas emission was more fluently, preventing causticity trail gas to enter into silo and decreasing the corrosion.②the temperature gradient was low. The temperature of material layer in silo was low, the volatile compounds was decreased and it could not formed gas phase condensation, then, it decreased greatly the low temperature corrosion of baking furnace.③the processing capacity of baking furnace was increased from 1.25 t per day to 1.5 t per day.(3) The reduction system had some shortcomings such as high energy consumption, low thermal efficiency and big hidden danger. So, it is necessary to improve the reduction system to decrease the catalyst cost and increase the market competitiveness. This paper adopted the following measures to improve the reduction system:installing a new F204/2 electrothermal furnace with power 600KW to replace, controlling working temperature and time intelligently by programmable controller, introducing C201/1 and C201/2 compressor into interlocking control system, buying a new E204/3 heat exchanger. After improvement, the result showed the efficiency of electric heating furnace (95%) was higher than that of F204/1 (51.01%), decreasing energy consumption, improving the accuracy of temperature control obviously, decreasing work intensity, heightening work efficiency, enlarging the loading capacity from 2.3 t to 3.5 t and decreasing white sphere to 0.