合成气直接制取低碳烯烃单管扩大试验——Ⅱ.催化剂性的研究

Single-tube scaleup tests on direct conversion of syngas to light olefinsⅡ. Studies of catalyst properties

将放大制备的原颗粒K-Fe-MnO/Silicalite-2催化剂在单管扩大试验装置上进行CO加氢制低碳烯烃反应,可达到CO转化率70%~90%、C_2~C_4烯烃选择性72%~74%的反应结果,并具有很好的稳定性和单程操作寿命;研究单管扩大试验工艺参数对该催化剂CO加氢制低碳烯烃性能的影响。结果表明,该催化剂可适合于较宽的反应工艺条件范围。反应温度、压力、空速的变化对催化剂CO加氢反应制低碳烯烃选择性的影响较温和;考察了催化剂的单程运转寿命,并进行了单管试验物料平衡计算,取得一些关键性数据,表明在反应尾气不循环的情况下,1m^3(STP,下同)(H_2/CO＝2:1)的合成气可转化为68.1gC_2~C_4烯烃,如将未转化的CO和H_2进行循环反应即可生成高达86.6g的低碳烯烃。

CO hydrogenation is carried out in a single-tube scaleup test unit to produce light olefins. in which the K-Fe-MnO/Silicalite-2 catalysts used are of the same particle size. The catalysts have fairly good stability and service life for single pass operation. The results are CO conversion up to 70%-90% and C2-C4 olefins selectivity 72%-74%. The effect of process data in these tests on the performance of the catalysts in CO hydrogenation to light olefins is studied. The results show that the catalysts are applicable for a relatively wide range of reaction conditions. Variations in reaction temperature,pressure and space velocity have a mild effect on the light olefins selectivity. The catalysts' life for single pass operation is investigated and the material balance of the single-tube tests is calculated,so that some important data are obtained. When no reaction off gas is recycled,1m3 of syngas(S. T. P. )(H2/CO = 2:1) can be converted to 68. lg C2-C4 olefins. If unconverted CO and H2 is recycled,86. 6g light olefins can be produced.