Composite catalyst and method of using hydrocracking tail oil to produce lubricant base oil

Abstract

The invention relates to the field of hydrocracking tail oil and particularly relates to a composite catalyst and method of using hydrocracking tail oil to produce lubricant base oil. The composite catalyst includes a first catalyst and a second catalyst. The first catalyst contains a ten-membered ring molecular sieve M1 and the second catalyst contains a ten-membered ring molecular sieve M2, wherein the molar ratio of silicon oxide to aluminum oxide in the ten-membered ring silicon-aluminum molecular sieves M1 and / or M2 is 120-300. The molecular sieves contain mesoporous structures; a closedhysteresis loop exists at the position P / P0 = 0.4-0.99 on a low temperature nitrogen adsorption-desorption curve, the start position of the closed hysteresis loop being at the position P / P0 = 0.4-0.7.The composite catalyst is used for hydrocracking of tail oil to produce lubricant base oil, great pour point declining effect can be achieved. The lubricant base oil is high in yield and viscosity index.

Description

technical field [0001] The invention relates to the field of hydrotreating of hydrocracking tail oil, in particular to a method for producing lubricating oil base oil by combining a catalyst and hydrocracking tail oil. Background technique [0002] Molecular sieve material has high acidity and high specific surface area, and is an excellent acidic catalyst. At the same time, molecular sieve materials have strong chemical stability and hydrothermal stability, and are difficult to be destroyed by corrosion and dissolution of reactants. Compared with commonly used homogeneous catalysts, molecular sieve material catalysts can be directly reused without separation, and will not pollute the environment and products. The specific surface area and other pore structure parameters of molecular sieve materials have an important influence on the catalytic performance of molecular sieves. Therefore, the preparation of molecular sieves with special channels is an important research direc...

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Problems solved by technology

The seed crystal selected in this invention is a microporous molecular sieve, which is added to the preparation system after silanization, and its hydrophobicity is used to increase its effect on the hydrophobic end of the surfactant micelle, thereby reducing the interaction between the two directing agents. However, the formed mesopores still do not have a regular structure, and whether the addition of seed crystals reduces the amount of templating agent has not been reported.

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