某公司MTO装置连续使用过2种不同的催化剂,为确定最新MTO催化剂工艺参数的调整方案,对替换前后的催化剂物理性质和固定流化床性能进行对比分析。结果表明,新剂相比原剂具有堆积密度低、单程寿命长、双烯选择性高的特点。据此降低装置的反应温度、再生温度、反应藏量、循环量和再生主风量,以匹配新剂高催化活性的特点,其中再生温度降低30℃,主风量降低25%,取消外补氧气,大幅降低了能耗;从产品组成看,应用新剂后,乙烯和丙烯总收率提高0.75%,副产物碳四、碳五以及产品气中二甲醚均下降,生焦率和碱洗塔"黄油"量下降。

A certain company has continuously used two kinds of catalyst in its methanol to olefin (MTO) plant.In order to determine the adjustment scheme of process parameters for the new kind of catalyst,the physical properties of the catalyst before and after replacement and the performance of fixed fluidized bed are compared and analyzed.It is found that the new catalyst has lower bulk density,longer single-pass life and higher ethylene and propylene selectivity than the original catalysts.According to these conditions,the reaction temperature,regeneration temperature,reaction reserve,circulation volume and regeneration main air volume of the MTO plant are dropped to match the new catalyst.The regeneration temperature is dropped by 30℃,the main air volume is reduced by 25%,and the external supplemental oxygen is eliminated,which greatly reduces energy consumption.From the perspective of product composition,after applying the new catalyst,the total yield of ethylene and propylene increases by 0.75%,both the yield of C₄/C₅ by-product and the content of dimethyl ether in the product gas decrease,and the coke rate and the amount of "butter" in the alkali washing tower decrease too.