分子筛型加氢裂化催化剂不注氨预硫化新技术应用

Practice of novel startup scheme for pre-vulcanization over high activity hydrocracking catalyst without ammonia injection

介绍了一种高活性的分子筛型加氢裂化催化剂在高温预硫化阶段不使用液氨钝化、直接使用直馏蜡油进行开工的新技术应用情况。与常规的催化剂液相注氨硫化技术方案相比,采用新技术的催化剂硫化过程可能要增加12~24 h,但少于催化剂气相硫化所需的开工时间。该技术在某套轻油型加氢裂化装置的首次开工过程中得到了成功应用,不仅节省了购买液氨和向反应系统注氨的步骤、减少了对注氨过程的依赖、简化了开工程序、提高了现场操作的安全性,同时也可以降低装置的固定投资成本。该装置的开工运行及标定数据均表明,相关催化剂体系在硫化结束后均保持了良好的活性和选择性,完全可以满足装置的开工和正常运行需要,值得同类装置参考。

This paper introduces the practice of a novel technology that directly uses straight-run wax oil for start-up in the high-temperature pre-vulcanization stage over a high-activity molecular sieve type hydrocracking catalyst without liquid ammonia passivation.The pre-vulcanization process employed this novel technology spends 12-24 hours more than that employs conventional catalyst liquid ammonia injection pre-vulcanization technology scheme, but spends less time than that employs catalyst gas phase vulcanization.This technology has successfully been applied in the first start-up of a light oil type hydrocracking plant, which cuts down the steps of purchasing liquid ammonia and injecting ammonia into the reaction system, simplifies start-up procedures, and improves the safety of on-site operation.It can also reduce the fixed investment cost of the plant.The start-up operation and calibration data of the plant show that the relevant catalyst system maintains good activity and selectivity after the end of vulcanization, which can fully meet the needs of start-up and normal operation of the device, and is worthy of reference for similar plants.