A kind of preparation method of powdery Fischer-Tropsch wax

Abstract

The invention discloses a powdered Fischer-Tropsch wax preparation method. The method comprises the following steps that 1, solid Fischer-Tropsch wax is crushed in a first liquid medium, filtration isconducted, and crushed Fischer-Tropsch wax with the surface to which the first liquid medium adheres is obtained; 2, the crushed Fischer-Tropsch wax with the surface to which the first liquid mediumadheres is stirred and mixed with a second liquid medium, filtration is conducted, crushed Fischer-Tropsch wax without the first liquid medium is obtained, and the first liquid medium and the second liquid medium are recycled; 3, the crushed Fischer-Tropsch wax without the first liquid medium is heated at 30-130 DEG C, the second liquid medium and the crushed Fischer-Tropsch wax are separated andgraded, crushed Fischer-Tropsch wax with different particle sizes is obtained, and the second liquid medium is recycled; 4, the first liquid medium mixed in the second liquid medium is separated, andthe first liquid medium and the second liquid medium are recycled. Accordingly, high pressure and high temperature are not needed, the particle size of the powdered Fischer-Tropsch wax is easy to control, energy conservation is achieved, and the investment is less.

Description

technical field [0001] The invention relates to a method for producing powdery wax, in particular to a method for preparing powdery Fischer-Tropsch wax, which belongs to the field of fine chemicals. Background technique [0002] Carbon monoxide and hydrogen can be synthesized by Fischer-Tropsch synthesis under a catalyst and a certain temperature and pressure to obtain a mixture mainly composed of alkanes, and liquid fuel can be obtained after separation. Compared with petroleum wax separated from petroleum, the number of carbon atoms of normal paraffins in Fischer-Tropsch wax is more than that of normal paraffins in petroleum wax, and the distribution of carbon atoms is wider. Fischer-Tropsch wax basically does not contain isoparaffins. Therefore, it has a high freezing point, low melt viscosity, high hardness, and basically does not contain sulfur and nitrogen compounds, so it is widely used as a lubricant in plastic processing and as a release agent for rubber processing,...

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Problems solved by technology

When using jet milling, or forming a microdispersion system with a certain gas to prepare powdered Fischer-Tropsch wax, there are potential safety hazards; due to the heat generated in the dry grinding method, it will cause the powdered paraffin or powdered Fischer-Tropsch wax to bond, thus producing Wet grinding method, the most ideal medium in wet grinding method is water, although Fischer-Tropsch wax is insoluble in water, but powdery Fischer-Tropsch wax will be agglomerated together, due to the existence of water, it is more difficult to separate powdery Fischer-Tropsch wax, powder The smaller the particle size of Fischer-Tropsch wax, the more difficult it is to separate the water contained in it. Due to the limitation of the freezing point of Fischer-Tropsch wax, the evaporation temperature is also limited. It is also very difficult to remove this part of water by vacuum drying and other methods. Fluidized bed drying is used. When using a vacuum, the boiling point of water cannot be lowered by vacuum, and the density of Fischer-Tropsch wax is lower than that of water, so Fischer-Tropsch wax always adheres to the inner wall of the container and the machine. When it needs to be cleaned, it is very difficult. The particle size requirements are different, and there are many types of products, so a method for producing powdered Fischer-Tropsch wax is needed to better meet market demand

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