Solvent dewaxing method of low wax content hydrocarbon oil

A dewaxing solvent and dewaxing technology, applied in the field of dewaxing of hydrocarbon oil, can solve problems such as difficulty in removal

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to remove wax from furfural refined extract oil by conventional solvent dewaxing process

Method used

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  • Solvent dewaxing method of low wax content hydrocarbon oil
  • Solvent dewaxing method of low wax content hydrocarbon oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The extracted oil is used as the raw material, and its properties are shown in Table 1. The mass ratio of microcrystalline wax to raw oil is 0.12:1, the dewaxing solvent is butanone-toluene mixed solvent, the volume content of butanone is 95%, the multi-point dilution process is adopted, and the total agent-oil ratio is 2:1. The deoiling solvent is the same as the dewaxing solvent, with one dilution, and the solvent-to-oil ratio is 0.7:1 (relative to the raw material oil). Attachedfigure 1 The flow process preparation dewaxed oil, concrete process is as follows:

[0040] (1) Add petroleum microcrystalline wax with a drop melting point of 75°C to the raw material oil, heat to 80°C, fully melt and mix well, then add dilution solvents successively. Cool to -15°C, filter to obtain dewaxed filtrate and dewaxed wax paste, and obtain dewaxed oil after removing the solvent from the filtrate. Add diluting solvent to the wax paste and mix evenly, heat to 15°C, filter to obtain ...

Embodiment 2

[0047] The raw material is hydrotreated oil, whose properties are shown in Table 1. The mass ratio of petroleum microcrystalline wax to raw oil is 0.06:1, the dewaxing solvent is butanone-toluene mixed solvent, the volume content of butanone is 50%, and the multi-point dilution process is adopted, and the total agent-oil ratio is 6:1. The deoiling solvent is the same as the dewaxing solvent, with one dilution, and the solvent-to-oil ratio is 1.5:1 (relative to the raw material oil). Attached figure 1 The flow process preparation dewaxed oil, concrete process is as follows:

[0048] (1) Add petroleum microcrystalline wax with a drop melting point of 80°C to the raw material oil, heat to 90°C, fully melt and mix evenly, then add dilution solvents successively. Cool to -10°C, filter to obtain a dewaxed filtrate and a dewaxed wax paste, and obtain a dewaxed oil after removing the solvent from the filtrate. Add diluting solvent to the wax paste and mix evenly, heat to 30°C, filt...

Embodiment 3

[0053] Trifurfural-reduced refined oil is used as raw material, and its properties are shown in Table 1. The mass ratio of petroleum microcrystalline wax to raw oil is 0.01:1, the dewaxing solvent is butanone-toluene mixed solvent, the volume content of butanone is 70%, and the multi-point dilution process is adopted, and the total agent-oil ratio is 4:1. The deoiling solvent is the same as the dewaxing solvent, with one dilution, and the solvent-to-oil ratio is 0.3:1 (relative to the raw material oil). Attached figure 1 The flow process preparation dewaxed oil, concrete process is as follows:

[0054] (1) Add petroleum microcrystalline wax with a drop melting point of 84°C to the raw material oil, heat to 100°C, fully melt and mix evenly, then add dilution solvents successively. Cool to -20°C, filter to obtain dewaxed filtrate and dewaxed wax paste, and obtain dewaxed oil after removing solvent from the filtrate. Add diluting solvent to the wax paste and mix evenly, heat t...

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Abstract

The present invention relates to a solvent dewaxing method of low wax content hydrocarbon oil. The solvent dewaxing method comprises: mixing raw material oil from a crude oil pressure reduction fraction segment, petroleum micro crystalline wax and a dewaxing solvent, cooling to achieve a filtration temperature, filtering to obtain a dewaxing filtrate and a dewaxing cerate, removing the solvent from the dewaxing filtrate to obtain dewaxing oil, mixing the dewaxing cerate and a deoiling solvent, heating to achieve a filtration temperature, and filtering to obtain a deoiling filtrate and a deoiling cerate, wherein a petroleum micro crystalline wax dropping-melting point is 67-92 DEG C, and a mass ratio of the petroleum micro crystalline wax to the raw material oil is 0.005:1-0.2:1. Compared with the conventional solvent dewaxing technology, the solvent dewaxing method of the present invention has the following characteristics that: wax in the low wax content hydrocarbon oil can be effectively removed, dewaxing temperature difference can be reduced, and a filtration rate can be increased.

Description

technical field [0001] The invention belongs to a method for dewaxing hydrocarbon oil. Specifically, the present invention relates to a method for solvent dewaxing of low-waxy hydrocarbon oil raw materials in the petroleum vacuum distillation section. Background technique [0002] In order to maintain the low-temperature fluidity of the lubricating oil, the wax contained in the raw oil must be removed during the production of the lubricating base oil to lower the freezing point or pour point of the lubricating base oil. The deoiled wax products are divided into paraffin wax and microcrystalline wax. Paraffin wax is mainly composed of normal alkanes and a certain amount of isoparaffins, while microcrystalline wax contains normal paraffins, isoparaffins and alkyl cyclic hydrocarbons, and contains A certain amount of alkylaromatics. There are many methods for lubricating oil dewaxing, the most common of which is solvent dewaxing. The principle of solvent dewaxing is to mix t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/04C10G73/22
Inventor 丁洛管翠诗王玉章王子军程志斌
Owner CHINA PETROLEUM & CHEM CORP
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