水蒸气对CO_(2)氧化丁烯脱氢制丁二烯工艺的影响

Effect of steam on process for oxidative dehydrogenation of 1-butene to1,3-butadiene with CO_(2)

对CO_(2)氧化丁烯脱氢制备丁二烯的反应体系中引入水蒸气的工艺进行了热力学计算,分析了水蒸气对催化剂选择性及稳定性的影响,并以FeVCrOx/γ-Al2O3为催化剂,考察了反应温度、反应质量空速对催化剂性能的影响。结果表明:向反应体系中引入水蒸气后,丁烯转化率和丁二烯收率会有所下降,但是,引入适量水蒸气可以提高催化剂的选择性;在水蒸气流量为0.028 8 mL/min,反应温度为600℃,反应质量空速为9 h-1的最优反应条件下,催化剂的选择性及稳定性均有所提高。

The process of introducing steam into the reaction of oxidative dehydrogenation of 1-butene to 1,3-butadiene with CO_(2)was studied by thermodynamic calculation and the effect of steam on catalyst selectivity and stability was analyzed.With FeVCrOx/γ-Al2O3as catalyst,the effect of reaction temperature and reaction space velocity on the catalyst′s performance was investigated.The results showed that the equilibrium conversion of 1-butene and the yield of 1,3-butadiene had decreased when steam was introduced into the reaction system,but an appropriate amount of steam could improve the selectivity of the catalyst.The selectivity as well as the stability of the catalyst were both improved under the optimum reaction conditions of water flow rate0.028 8 mL/min,reaction temperature 600℃and reaction mass space velocity 9 h-1.