关键词: 焦化石脑油, 加氢装置, 加氢捕硅剂, 低温保护反应器, 高活性加氢精制催化剂, 硅杂质沉积量

Abstract:

At present, in order to realize long-term stable operation of coking naphtha hydrogenation unit, two major problems need to be solved: high diolefin content in coking naphtha is easy to condense and coke at relatively high reaction temperatures, which leads to the rise of reactor pressure drop; silicon-containing additives used in the pre-processing stage can cause silicon dioxide deposition on the surface of the catalyst, resulting in fast deactivation and short operation cycle of catalyst. These strategies are proposed include the addition of low-temperature de-diolefin protection reactors to the process, the development of hydro-desilicification guard catalyst with strong silicon capacity and high activity hydrofining catalyst. The industrial application results show that the operation cycle of the coking naphtha hydrogenation unit is greatly extended, which provides technical support for the long cycle operation of the unit.

Key words: coking naphtha, hydrogenation unit, hydro-desilicification guard catalyst, low-temperature protection reactors, high activity hydrofining catalyst, deposition amount of silicon impurities