Research On The Ratio Of Water Vapor To Hydrocarbon In Producting Ethylene With Steam Pyrolysis

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 light hydrocarbon 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 method regulating dilution ratio in present industrial production can make residence time change. So ethylene yields obtained with this method are affected not only by dilution ratio but also by residence time. Through massive analysis and computation, this article revised pyrolysis experiment method and proposed improved experiment technique of controlling dilution ratio independently. The method that controlling the total of inlet hydrocarbon and water flow rate can compute individual hydrocarbon and water flow rate in different dilution ratio and can eliminate the change caused by regulating dilution ratio, so the true influence of dilution ratio on ethylene yields can be known. This article has simulated and calculated the process of Daqing light hydrocarbon pyrolysis with self-designed two-dimensional technological mathematical model and inspected the influence of three operating conditions on ethylene yield in different temperature, residence time, the dilution ratio, as well as the impact of the interaction among three factors on ethylene yield from range analysis and variance analysis of orthogonal design. With this method the interaction between residence time and dilution ratio decreases. The feasibility of this new method is proved.