Treatment of CS2 in waste gas from rubber refining by gas cyclone-liquid jet separator

Abstract

In the rubber industry, there is a lack of a low-cost and high-efficiency CS2 waste gas treatment method. In this study, the effect and feasibility of removing CS2 waste gas by gas cyclone-liquid jet separator were studied, and the application of the device in this field was expanded. Computational fluid dynamics (CFD) method was used to study the flow field characteristics of gas cyclone-liquid jet separator, so as to guide the selection of experimental conditions. The removal efficiency of CS2 was verified by experiments, and a mathematical model of KLa=10-3EReG1.25ReL0.41DG1/3 for predicting the mass transfer coefficient was proposed. The calculated KLa by the model is consistent with the experimental data, with a deviation of ±3%. On the basis of experimental verification, the industrial side line test was carried out to study the application of the purifier in industry. The results showed that due to the increase of the mass transfer coefficient, lower temperature of absorption solution and higher liquid phase velocity are beneficial to enhance the removal effect of CS2. However, merely increasing the mass transfer coefficient cannot ensure a higher absorption efficiency. This is also the reason why the highest efficiency of 94.05% is obtained when the intake air flow is 18 l/min, rather than the higher intake air flow rate. The gas cyclone-liquid jet separator has been successfully applied to remove CS2 from waste gas from rubber industry for the first time, which greatly reduces the treatment cost and has an excellent application prospect.