| As an important chemical raw material,styrene is widely used in the petrochemical,medical and aerospace fields.In this study,aiming at the low concentration styrene exhaust gas discharged in the production process of a synthetic resin chemical enterprise,the traditional washing tower series process has the problems of large equipment volume,large water consumption,and low purification efficiency of styrene.The research of rotary packed bed（high gravity technology）purification is carried out to effectively improve the mass transfer efficiency of exhaust gas absorption and meet the requirements of standard discharge.As a new process intensification technology,high gravity technology can greatly improve mass transfer efficiency.In this study,a co-current rotating packed bed experimental device for purifying the low concentration styrene waste gas was designed and self-made,and suitable absorbents and operating parameters were studied and found to achieve efficient purification of styrene waste gas.In this study,the aqueous solution of anionic surfactant sodium alkylbenzene sulfonate was used as the absorbent,because the substance had both lipophilic and hydrophilic groups and had a good trapping effect on styrene gas.The effective absorption of low-concentration styrene waste gas can be achieved by using a 2%sodium alkylbenzene sulfonate solution.Under the same operating conditions,the absorption performance of styrene is 128%higher than that of deionized water.The co-current rotating packed bed was used as the absorption equipment,and a 2% sodium alkylbenzene sulfonate absorbent was used to absorb low concentration styrene gas.The single factor experiment method was used to obtain that the absorption rate increased with the increase of the high gravity factor and the spray density of the absorption liquid,and decreased with the decrease of the empty bed gas velocity.The total mass transfer coefficient of the gas phase increased with the increase of the high gravity factor,the spray density of the absorption liquid,and the empty bed gas velocity.When the high gravity factor is 80,the spray density of absorbent is 17.69 m3/（m2 h）,and the empty bed gas velocity is 0.4 m/s,the absorption rate is as high as 98.5%,and the total gas mass transfer coefficient is 0.0373 s-1.Larger packing rotor size is better for styrene absorption.The response surface analysis method was used to fit the experimental data to obtain a good model.The interaction between each factor on styrene absorption rate was not obvious,and the influence degree of factors was high gravity factor>spray density>air velocity.In this paper,the co-current rotating packed bed was used as the absorption equipment,and the addition amount of about 2%sodium alkylbenzene sulfonate was used as the absorbent.The absorption rate of low concentration styrene gas was effectively improved,which provided a theoretical basis for the application of high gravity technology in the tail gas treatment of styrene in related industries,and had application value and environmental significance.Figure[31]Table[18]Reference[70]... |
