A kind of preparation method of white oil

Abstract

The invention relates to the technical field of ketone-benzene dewaxing, in particular to a preparation method of white oil. The preparation method includes the following steps: 1) dewaxing: mixing the low-wax raw material with the first ketonebenzene dewaxing solvent, filtering and separating to obtain the dewaxing filtrate and the oily waxy liquid; 2) one-stage deoiling: mixing the oily waxy liquid with the first The diketobenzene dewaxing solvent is mixed and divided into the first oil-containing wax liquid and the second oil-containing wax liquid; 3) Second-stage deoiling: mix the first-stage deoiled wax liquid, the second oil-containing wax liquid and the third ketone-benzene dewaxing solvent After that, it is divided into the third oil-containing wax liquid and the fourth oil-containing wax liquid, and the third oil-containing wax liquid is filtered and separated to obtain the second-stage deoiling filtrate and the second-stage oil-containing wax liquid; 4) clay refining. In the preparation method of the present invention, the low-wax raw material is dewaxed by ketone benzene to ensure the low-temperature fluidity of the product, and the low-wax raw material can be processed. The process is stable and the dewaxed oil with a qualified freezing point is obtained, and the product stability, impurities and color are guaranteed by refining with white clay. , by increasing the amount of stripping steam to ensure the smell of the product.

Description

technical field [0001] The invention relates to the technical field of white oil, in particular to a preparation method of white oil. Background technique [0002] White oil is a special mineral oil product obtained by ultra-deep refining to remove impurities such as aromatics, sulfur and nitrogen. Its components are generally naphthenes and alkanes with a relative molecular mass of 300-400. It is a lubricating oil fraction, colorless, Tasteless, odorless, chemically inert and excellent light and heat stability, widely used. As a product with high added value, white oil is being valued by the domestic petrochemical industry. [0003] The classification of white oil in my country is different from that in foreign countries. Foreign countries are generally divided into two categories: one is industrial grade white oil; the other is food and pharmaceutical grade white oil. Domestically, it is divided into three grades, namely industrial grade, cosmetic grade and food and phar...

AI Technical Summary

Problems solved by technology

The white oil hydrofining method has been researched and applied for more than 20 years, but the development is slow, and the proportion of white oil produced by hydrogenation is not high, while in developed countries it is about 4 / 5 or more

[0005] At present, the white oil processing technology has the patent CN101429457 (a method for hydrogenating distillate oil to produce more white oil) applied by the Academy of Petroleum Sciences. The method is to feed a hydrocarbon oil to a hydrogenation reaction unit, a dewaxing reaction unit, Hydrofining unit, to obtain white oil product oil, this method requires three-stage high-pressure hydrogenation, equipment investment is large, and the catalyst contains precious metals, and the catalyst operation cost is high