Lubricating oil isomerization dewaxing process

With the increasingly strict environmental protection regulations and the development of the machinery industry (especially the automotive industry), higher requirements are put forward for the performance of lubricating oil. In order to produce these high-performance lubricants, especially for the preparation of large-span multistage internal combustion engine oils, it is necessary to use a base oil with low volatility and high viscosity index, that is, VI greater than 120 and saturation greater than 90%. APIⅢ base oil, which is mainly composed of iso-alkanes, has these characteristics and can meet the above requirements. Solvent dewaxing and catalytic dewaxing processes can not produce class III base oil, because these two processing methods can only remove the high viscosity index of N-alkanes from the oil, resulting in a low viscosity index of the base oil, but can not convert these high viscosity index of N-alkanes into high viscosity index, low pour point of isomeric alkanes, which not only makes the base oil yield low, And can not meet the specifications of high-quality base oil requirements. The basic principle of isomerization dewaxing is to isomerize high pour point normal alkane into low pour point branched alkane under the action of special molecular sieving catalyst. Isomerization dewaxing has become an important means to produce API Ⅲ base oil. Isodewaxing technology of Chevron and MSDW technology of Exxon Mobil are the main technologies of heterogeneous dewaxing of lubricating oil that have been realized in industrialization.

2023-06-26

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