固定床反应器中乙醇制混合烃工艺过程考察

Study of Ethanol Conversion to Mixed Hydrocarbon in a Fixed Bed Reactor

乙醇制备乙烯、C4~7 的烷烃和烷基苯等基本化学品是补充或替代化石能源的一条有效途径。本工作研究了ZSM-5 作为催化剂，在固定床管式反应器中将乙醇转化为气相轻烃和液相混合烃过程，考察了反应温度、质量空速和反应压力对液相烃收率的影响，以及反应温度对催化剂使用寿命的影响。实验表明：在反应温度390 ℃，质量空速(WHSV) 7.10 h-1 和反应压力2.50 MPa 的条件下，乙醇转化为气相轻烃、液相烃和水的收率分别是38.40%、22.60%和39%；气相轻烃的主要成分是乙烯，含量92.30%，液相混合烃由20.74%的C4~7的烷烃，72.09%的C7~11 的烷基芳烃和4.99%的C11~14 的烷基萘组成。在8 h 的连续反应中催化剂的催化性能无明显下降。

Ethanol is a renewable green energy, and it is an effective way to supplement or substitute fossilfuels with ethylene, C4-7 alkanes, alkyl benzene and other basic chemicals transformed by ethanol. In thiswork, the ZSM-5 as a catalyst in a fixed-bed-reactor in the conversion of ethanol to the gas and liquidhydrocarbons were studied. The effect of reaction temperature, weight hourly space velocity (WHSV) andreaction pressure on the yield of liquid hydrocarbons, and the effect of temperature on the catalyst life wereinvestigated. . The reaction products were composed of 38.40% gas hydrocarbons, 22.6 % liquidhydrocarbons and 39 % water at WHSV 7.10 h-1, at 390 ℃ and 2.50 MPa pressure. The gas hydrocarbonswere mainly ethylene (92.30 %) and the liquid hydrocarbons were mainly composed of 20.74% C4-7 alkanes,72.09 % C7-11 alkylbenzenes and 4.99 % C11-14 alkylnaphthalenes. No activity decrease of the catalyst wasobserved in the 8 h continuous reaction.