Study And Optimization Of Performance Of Naphtha Pyrolysis In Daqing Petrochemical Company

Ethylene is the important industrial chemicals, and the optimization of ethylene raw material is the important measure to reduce the cost of ethylene production. There is an increasing demand for feedstock with Daqing Petrochemistry Company expanding the products. Considering the present situation of Daqing petrification material shortage, one kind of typical naphtha was selected with Daqing Research institute's simulation test installment. Prolysis experiments have been carried out to inspect the influence of temperature, residence time and the ratio of steam to hydrocarbon on ethylene yields in order to analyze the experimental datum with the orthogonal testing method and inspect the correlation of these three factors and the influence of them on ethylene yields.The results show that the three factors influence the ethylene yields significently and the sequence from big to small is temperature, residence time and steam/hydrocarbon. By anlysis, the optimal technical condition for ethylene production in Daqing petrochemistry company is 860℃, 0.25 second and 0.65 mass ratio. It can be seen that correlation is bigger than error although they less than the influence of thress factor indepently because the testing method is unreasonable. After analysising, the adjustment method of steam/hydrocarbon exists certain question. It is suggested changing steam/hydrocarbon while maintaining the entrance mole flow rate, namely in the course of changing steam/hydrocarbon, simultaneously changing both raw material and the steam flow rate while the entrance mole number rate is invariable, so residence time is invariable. With this method, the true influence of temperature, residence time and steam / hydrocarbon on ethylene yields can be determined.