Method for producing lubricant base oil by hydrogenation isomerization dewaxing

Abstract

The invention relates to a method for producing lubricant base oil by hydrogenation isomerization dewaxing. The method is as follows: raw oil is mixed with hydrogen, then enters into a hydrocracking reaction zone to contact with a Y-type molecular sieve-containing noble metal hydrocracking catalyst for reaction, the polycyclic napthene ring-opening reaction is performed, and a reaction effluent, without separation, directly enters into a hydrogenation isomerization dewaxing reaction zone to contact with a hydrogenation isomerization dewaxing catalyst for n-alkane isomerization reaction to obtain high viscosity index lubricant base oil with the pour point meeting the requirements. According to the method, the ring-opening reaction of polycyclic napthenes with more than two rings in the raw material is performed, the content of low viscosity index component polycyclic napthenes is reduced, the viscosity index loss in the isomerization dewaxing process is reduced, and the high viscosity index lubricant base oil with the pour point meeting the requirements is obtained.

Description

technical field [0001] The invention relates to a production method of lubricating oil base oil, in particular to a method for producing lubricating oil base oil by hydroisomerization dewaxing. Background technique [0002] The purpose of hydroisomerization dewaxing is to reduce the pour point of raw materials and maintain a high viscosity index by isomerizing normal paraffins into isoparaffins through hydroisomerization dewaxing catalysts. The hydroisomerization dewaxing catalyst needs to match the acidity and hydrogenation / dehydrogenation performance. The acidity is generally provided by the carrier, and the hydrogenation / dehydrogenation activity is provided by the metal component. [0003] At present, there are many reports about hydroisomerization dewaxing catalysts, such as U.S. Patent Nos. The acidic components used in structural dewaxing catalysts mainly include mordenite, SAPO-11, SAPO-31, SAPO-41, ZSM-23, SSZ-32, TON molecular sieves, etc. TON molecular sieves main...

AI Technical Summary

Problems solved by technology

Regardless of whether hydrocracking or hydrotreating is used to produce isomerized dewaxed feedstock, a high conversion rate is required to achieve such a high viscosity index requirement, resulting in a significant reduction in the yield of isomerized dewaxed feedstock