Method for preparing white micro-crystalline wax

A microcrystalline wax, white technology, applied in petroleum wax refining and other directions, can solve the problems of special catalyst performance requirements, narrow selection of raw wax, large material loss, etc., to reduce production links and environmental pollution, and solve the problem of long production process, The effect of improving quality

Inactive Publication Date: 2011-04-20
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the first three kinds of white microcrystalline wax is to firstly process paraffin-based deasphalted oil through solvent refining and solvent dewaxing to obtain deoiled microcrystalline wax, and then go through hydrogenation refining or a combined process with white clay refining to prepare the target product Microcrystalline wax, the main defects of this type of process route are: (1) The process route is long, energy consumption is high, the material loss in the production process is large, and the product yield is low
(2) Due to the limitation of the preparation process of high-grade microcrystalline wax, the selection range of raw material wax is narrow
[0006] It can be seen from the above-mentioned disclosed technical schemes of documents that the existing white microcrystalline wax product preparation process mainly firstly produces coarse microcrystalline wax, and then uses it as a raw material to obtain a white microcrystalline wax product through a hydrogenation process using a suitable catalyst. This route mainly has defects such as narrow selection of raw material wax, high quality requirements, and special catalyst performance requirements.

Method used

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  • Method for preparing white micro-crystalline wax

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Paraffin-based deasphalted oil and naphthenic deasphalted oil were fully mixed at a ratio of 96:4 by weight. The properties of paraffin-based deasphalted oil, naphthenic deasphalted oil, and blended oil A after mixing are shown in Table 1.

[0020] The mixed oil enters the two-stage hydrogenation reactor for hydrogenation reaction, and the hydrogenated oil obtained is fractionated and cut to obtain a heavy fraction at 480°C to 750°C. The operating parameters of the reaction conditions and the property analysis of the heavy fraction are shown in Table 2. Catalyst property analysis See the first set of catalyst systems in Table 4.

[0021] 480 ℃ ~ 750 ℃ ​​heavy fraction, mixed with dewaxing solvent at a ratio of 4:1, the dewaxing solvent is a mixture of butanone and toluene, wherein the weight of butanone accounts for 50% of the mixture, and toluene accounts for 50%, gradually cooling down the temperature To -20°C, after filtration, wax filtrate and oil-containing wax pas...

Embodiment 2

[0023] Using the blended oil A raw material and hydrogenation process conditions in implementation 1, the hydrogenation catalyst is selected as the second group of catalysts in Table 4, and the heavy fraction at 480°C to 750°C is mixed with the dewaxing solvent, and the dewaxing solvent is acetone and benzene The mixture, wherein the weight of acetone accounts for 70% of the mixture, benzene accounts for 30%, gradually cooling down to -15 ° C, after filtration, wax filtrate and oily wax paste are obtained, after recovery of oily wax paste, deoiled wax, deoiled wax It is a white microcrystalline wax product, and the yield and property analysis of the white microcrystalline wax product are shown in Table 5.

Embodiment 3

[0025] Using the blended oil A raw material and hydrogenation process conditions in implementation 1, the hydrogenation catalyst is selected as the third group of catalysts in Table 4, and the heavy fraction at 480°C to 750°C is mixed with the dewaxing solvent, and the dewaxing solvent is methyl ethyl ketone and A mixture of benzene, wherein the weight of methyl ethyl ketone accounts for 70% of the mixture, and benzene accounts for 30%. Gradually cool down and lower the temperature to -15°C. After filtration, the wax filtrate and oily wax paste are obtained. After the oily wax paste is recovered, deoiled wax is obtained. The oil wax is a white microcrystalline wax product, and the yield and property analysis of the white microcrystalline wax product are shown in Table 5.

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Abstract

The invention relates to a method for preparing white micro-crystalline wax. The method comprises the following steps of: feeding blended oil of paraffin base vacuum residue deasphalted oil and naphthenic base vacuum residue deasphalted oil serving as a raw material into a first reaction bed to perform hydrogenation modification reaction and feeding the raw material into a second reaction bed to perform hydrorefining reaction; cutting the obtained hydrogenated oil by using an atmospheric and vacuum fractionation device to obtain a heavy lubricating oil component of between 480 and 750 DEG C; mixing the heavy lubricating oil component and an acetone benzol dewaxing solvent; cooling the mixture to below -15 DEG C; and filtering to obtain dewaxed filtrate and deoiled wax, wherein the deoiled wax is the white micro-crystalline wax; the Saybolt color number of the white micro-crystalline wax is +20; the drip melting point ranges from 77 to 82 DEG C; the penetration is 23 to 30 (1 / 10mm); the oil content ranges from 0.85 to 3.8 percent; the sulfur / nitrogen content is below 2mu g / g; the heavy metal content and arsenic content are less than 1mg / kg; and the product quality can reach SH0009-90 cosmetic-grade paraffin industry standard.

Description

technical field [0001] The invention relates to a preparation method of petroleum wax, in particular to a preparation method of petroleum microcrystalline wax. Background technique [0002] White microcrystalline wax belongs to special microcrystalline wax, which is an important raw material for medicine, daily chemical industry and other fine chemical products. Microcrystalline wax is the degassed wax obtained when lubricating oil is refined from the vacuum residue produced by atmospheric and vacuum equipment. Its main components are cyclic hydrocarbons with normal or isomeric alkyl side chains, especially naphthenes. Refined microcrystalline wax is crude crystalline wax, in addition to containing more sulfur, nitrogen, oxygen heteroatom compounds and aromatic compounds, it also contains a small amount of polymer condensed ring compounds such as colloidal asphaltenes. [0003] According to the existing production process, microcrystalline wax is a product processed by solv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G73/44
Inventor 汪军平熊春珠李春娣田凌燕蔡烈奎
Owner PETROCHINA CO LTD
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