Microcrystalline wax decolouration method

A microcrystalline wax and white technology, applied in the refining of petroleum wax, etc., can solve the problems of reduced processing capacity of equipment, frequent replacement of raw materials, and reduced yield of qualified products, and achieve optimal operation mode, outstanding decolorization effect, and high-quality effect

Active Publication Date: 2006-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] US4148711 discloses a two-stage hydrofining method for microcrystalline wax. This method recycles part of the hydrogenated products of the second stage to the inlet of the second stage. Device processing volume reduction
US5205923 discloses a microcrystalline wax hydrofinishing method. In this method, when the activity of the catalyst decreases, the microcrystalline wax is replaced by paraffin as the feed of the device, so as to achieve the purpose of cleaning the catalyst and restoring the activity of the catalyst. The disadvantage is that the device frequently replaces raw materials and the qualified product Reduced yield

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0012] The effects of the present invention are specifically described below through examples.

[0013] The hydrorefining raw materials used in the examples and comparative examples of the present invention are C75 microcrystalline wax and Y80 microcrystalline wax, and their properties are shown in Table 1.

[0014] The embodiment of the present invention and comparative example adopt two catalyst beds to pack the same catalyst, and the catalyst that adopts is the petroleum wax hydrorefining catalyst that active metal is W-Ni, and its WO 3 29.4%, NiO 4.4%, also containing SiO 2 5.0%, P 2 o 5 2.5%, catalyst specific surface area 235m 2 / g, pore volume 0.47ml / g.

[0015] The hydrogenation products of the embodiments of the present invention and comparative examples are characterized by Saybolt color (GB / T3555), the larger the number, the better the color.

[0016] See Table 2 for the operating conditions and results of hydrofinishing in Examples and Comparative Examples ...

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PUM

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Abstract

The invention offers a decolouration method for microcrystalline wax, especially for stripping the color of the microcrystalline wax through hydrogenation refining. The invention inncludes two catalyst beds with different volume, the volume of the first bed is larger than the second, the volume ratio of the two beds is 1.2í½2.0í†1, and the bed reaction temperature is 40íµí½100íµ higher than the second. Comparing with the present operational methods whose second bed is equale to or larger than the first bed, said invention improves the decolouration effect on the condition of making every index of the product acceptable, could be used to produce white microcrystalline products of high grade whose condensed-nuclei aromatics are specificated, and meet the needs for special fields.

Description

technical field [0001] The invention relates to a method for decolorizing microcrystalline wax, in particular to removing the color of microcrystalline wax by adopting a hydrogenation refining method. Specifically, it is a microcrystalline wax hydrodecolorization method using two catalyst beds with different volumes. Background technique [0002] Microcrystalline wax is a petroleum wax product isolated from the vacuum residue fraction of petroleum. The production of microcrystalline wax from vacuum residue generally requires processes such as solvent deasphalting, solvent refining, and solvent dewaxing and deoiling. The microcrystalline wax obtained after deoiling is darker in color and contains more sulfur nitrogen compounds, polycyclic aromatic hydrocarbons and metal impurities. The production of commercial microcrystalline wax must refine the deoiled microcrystalline wax to improve product color and reduce viscosity. Aromatic content. [0003] The refining of deoiled m...

Claims

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Application Information

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IPC IPC(8): C10G73/44
Inventor 王士新袁平飞李殿昭刘平蔡立
Owner CHINA PETROLEUM & CHEM CORP
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