White oil preparation method

Abstract

The invention relates to the technical field of ketone-benzol dewaxing, particularly to a white oil preparation method, which comprises: 1) dewaxing: mixing a low-wax raw material and a first ketone-benzol dewaxing solvent, and carrying out filtration separation to obtain a dewaxing filtrate and an oil-containing wax liquid; 2) first-stage deoiling: dividing into a first oil-containing wax liquidand a second oil-containing wax liquid after mixing the oil-containing wax liquid and a second ketone-benzol dewaxing solvent; 3) second-stage deoiling: dividing into a third oil-containing wax liquidand a fourth oil-containing wax liquid after mixing the first-stage deoiling wax liquid, the second oil-containing wax liquid and a third ketone-benzol dewaxing solvent, and carrying out filtration separation on the third oil-containing wax liquid to obtain a second-stage deoiling filtrate and a second-stage oil-containing wax liquid; and 4) refining with white clay. According to the present invention, with the preparation method, the low-temperature fluidity of the product can be ensured through the ketone-benzol dewaxing of the low-wax raw material, the low-wax raw material can be treated,the process operation is stable, the dewaxing oil with the qualified freezing point is obtained, the stability, the impurity and the color of the product are ensured through the refining with the white clay, and the odor of the product is ensured by increasing the amount of steam stripping steam.

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 obtained by ultra-deep refining to remove impurities such as aromatic hydrocarbons, sulfur and nitrogen. Its components are generally naphthenes and alkanes with a relative molecular mass of 300-400. It is tasteless, odorless, chemically inert and has excellent light and heat stability, and is widely used. As a high value-added product, white oil is being valued by the domestic petrochemical industry. [0003] The classification of white oil in my country is different from that of 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. There are three domestic grades, namely industrial grade, cosmetic grade and food and pharmaceutical grade. Its main property indica...

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