Deoiling method of high-melting-point Fischer-Tropsch synthesis wax

Abstract

The invention provides a deoiling method of high-melting-point Fischer-Tropsch synthetic wax, which comprises the following steps: mixing Fischer-Tropsch refined wax with the melting point of more than 70 DEG C with a wax crystal modifier in a molten state to obtain a mixture; wherein the wax crystal modifier is selected from one or more of polyolefin, poly (methyl) acrylate, a dialkyl fumarate-vinyl acetate copolymer, a styrene-maleic acid vinegar copolymer and a condensation compound of naphthalene; and loading the mixture, cooling and crystallizing, and centrifugally deoiling in the heating sweating process, and collecting to obtain the deoiled Fischer-Tropsch synthesis wax. According to the method, on one hand, the wax crystal modifier is added into the raw material wax, so that wax crystals with relatively large particle sizes are formed when the raw material wax is crystallized, and 'sweat' is favorably discharged from relatively large wax crystal gaps in the later period; and on the other hand, centrifugal equipment is adopted during sweating operation, so that the sweat removal efficiency and effect are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of Fischer-Tropsch synthetic wax, in particular to a method for deoiling high-melting Fischer-Tropsch synthetic wax. Background technique [0002] At present, the deep processing of Fischer-Tropsch synthetic wax in China is mainly through related processes such as hydrofining and separation, and the refined wax is initially separated into low melting point (less than 50°C), medium melting point (50-80°C) and high melting point (80-110°C) Above) and other brands of Fischer-Tropsch wax products. Although the Fischer-Tropsch synthetic wax has a high degree of normalization, it still contains a small amount of oil components. The cut Fischer-Tropsch wax products with various melting points have high oil content, which still has a significant gap with foreign products and cannot meet the needs of high-end customers. Therefore, in order to obtain high-end wax products that meet the domestic and foreign product in...

AI Technical Summary

Problems solved by technology

[0007] For ordinary sweating and deoiling methods, in the process of heating and sweating, there are two types of components: waxes with higher melting points of solid components, waxes with lower melting points and oils with liquid components Although they are in two phases of solid and liquid, it is difficult to completely separate them

In order to make the oil content of the final product meet the requirements, the method of prolonging the sweating time and raising the sweating termination temperature is usually adopted, but this will lead to a long production cycle and a decrease in product yield