Abstract:

The disproportionation unit is an important component of aromatics complex. Comparing the calibration results of the ex-situ regenerated disproportionation catalyst with the technical agreement values of the new catalyst, it is found that the performance of the ex-situ regenerated catalyst can basically reach the level of the new catalyst. The operational data of the first four months after the operation of the in-situ and ex-situ regenerated catalysts are compared. At similar weight hourly space velocity, the total conversion rate of the ex-situ regenerated catalyst is slightly lower than that of the in-situ regenerated catalyst, while the total selectivity is slightly higher and the hydrogen consumption is slightly lower. As the operating time prolongs, the in-situ regenerated catalyst maintains operation at a high weight hourly space velocity, and the reaction temperature slightly increases; when the operating load of the in-situ regenerated catalyst is 105.4%, the total conversion rate decreases by 2.2 percentage points, and the total selectivity slightly decreases by 0.5 percentage points; the weight hourly space velocity and reaction temperature of the ex-situ regenerated catalyst are relatively low, which may be related to the slightly lower processing capacity of the selected unit; when the operating load of the ex-situ regenerated catalyst is 92.3%, the total conversion rate decreases by 2.45 percentage points, the total selectivity increases by 1.21 percentage points, and the chemical hydrogen consumption decreases by 0.1 percentage points. In addition, if conditions permit, the total conversion rate of the reaction should be controlled between 42% and 44% to balance catalyst deactivation rate, selectivity and energy consumption.

Key words: aromatics complex, disproportionation unit, disproportionation catalyst, in-situ regeneration, ex-situ regeneration, coking deactivation, total conversion rate, overall selectivity

摘要：

歧化单元为芳烃联合装置的重要组成部分。对比歧化催化剂器外再生剂标定结果和新剂技术协议值，发现器外再生剂性能基本达到新剂水平。对比器内、外再生剂投运后前4个月的运行数据发现：相近质量空速下，器外再生剂总转化率比器内再生剂略低，而总选择性略高，氢耗略低；随运行时间延长，器内再生剂运行维持在较高质量空速，反应温度略有升高；器内再生剂运行负荷105.4%,总转化率下降2.2百分点，总选择性下降0.5百分点；器外再生剂质量空速和反应温度相对稍低，这可能与所选装置处理量略低有关；器外再生剂运行负荷92.3%,总转化率下降2.45百分点，总选择性升高1.21百分点，化学氢耗降低0.1百分点。另外，在条件允许的情况下应控制反应总转化率在42%～44%,以平衡催化剂失活速率、选择性和能耗。

关键词: 芳烃联合装置, 歧化单元, 歧化催化剂, 器内再生, 器外再生, 结焦失活, 总转化率, 总选择性