A small amount of WLDN solid denitrogenation agent was added into lubricant base oil in the process of clay refining and basic nitrogen compounds were removed together with the clay by filtering after the reaction.

• 该工艺是在白土精制过程中加入少量WLDN固体脱氮剂 ,反应完毕后过滤 ,则碱性氮化物与白土一起被脱除。