连续重整装置催化剂更换的分析与判断

DIAGNOSIS FOR CCR CATALYST REPLACEMENT

介绍了连续重整催化剂进入寿命末期带来的问题。从比表面积减少、载体晶相破坏、Pt金属分散度下降和金属杂质污染等方面对影响催化剂寿命的因素进行分析和讨论。采用模拟计算和实验室催化剂活性评价相结合的方法，定量分析了工业装置运转催化剂和新鲜催化剂之间的性能差异。通过对不同运转时间的催化剂与新鲜剂的物化性质、催化反应性能以及装置经济性的比较，提出了催化剂更换的技术指标。催化剂更换与否通常是多种因素综合作用的结果，当催化剂比表面积下降至140～145m2／g以下，Pt金属分散度下降致使反应器平均入口温度升高4～5℃，C5＋产品收率下降1．5～2．0百分点时，为降低装置运行风险、提高经济效益，建议更换新催化剂。

Based on the analysis of specific surface area, the damage extent of support ：rystal phase, Pt dispersion, and metal impurity pollution of the CCR catalyst at the end of run, the diffe：：ence between fresh catalyst and the catalyst in operation was quantitatively compared by using simulation calculation and laboratory activity test. The technical parameters for catalyst replacement were proposed by com- parison of the physicochemical properties, catalytic activity and the unit economy between fresh catalyst and the catalyst at different time on stream. When the specific surface area of catalyst in operation is less than 140-145 m2/g, and the activity decreases by 4--5 ℃ and the yield of Cs＋ decrease, by 1.5-2.0 percentage pionts, the catalyst in service must be replaced to reduce the operation risk and boost the e- conomic benefit of CCR unit.