Production method of polyolefin white oil

Abstract

The invention discloses a production method of polyolefin white oil. The production method comprises the following steps: (1) by taking paraffin and naphthene based lubricating base oil as raw material oil, blending the paraffin and naphthene based lubricating base oil, and dehydrating; (2) inputting the processed raw material oil into two tandem fixed bed reactors with noble metal catalysts, and performing two-section high-pressure hydrogenation treatment in the presence of a hydrorefining catalyst; and (3) dehydrating and refining to obtain the high-viscosity food-grade polyolefin white oil. The production method has the beneficial effects that the reaction temperature can be reduced, the degradation of the raw material viscosity during hydrorefining can be reduced, and the hydrogenation effect of the high-viscosity white oil can be ensured; the change of pour points and flash points can be reduced; the requirements of saturated aromatic hydrocarbons can be met; the strict requirements of the polyolefin white oil on the water content can be met; a process is flexible to perform and the polyolefin white oil is strong in market adaptability.

Description

technical field [0001] The invention relates to a production method of polyolefin white oil. [0002] Background technique [0003] Food-grade white oil is an ultra-deeply refined colorless, tasteless, odorless and non-corrosive high-value-added special white oil, composed of saturated alkanes (alkanes and cycloalkanes), of which aromatics, sulfur, nitrogen, oxygen, etc. are harmful The impurity content is approximately zero (or extremely low), food-grade white oil has good chemical inertness and excellent light and heat stability; the differences of various white oils are mainly: kinematic viscosity, chromaticity, easy carbide and ultraviolet absorbance Wait. There are two main methods for the deep refining of white oil: sulfonation method and hydrogenation method. [0004] Among them, the sulfonation method has been phased out due to its high pollution, low yield, and product quality that cannot meet food-grade requirements; while the more advanced hydrogenation method ...

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Problems solved by technology

[0006] 2) For raw materials with high viscosity (kinematic viscosity greater than 70mm2 / s at 40°C), due to the limitation of production equipment (high temperature and high pressure), in addition, the hydrogenation catalyst cannot meet the requirements. After hydrogenation, only industrial-grade white oil can be obtained

[0007] Therefore, for high-viscosity raw materials, food-grade white oil cannot be obtained after hydrogenation treatment in the prior art; for the problems in related technologies, no effective solution has been proposed yet

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