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Solvent dewaxing method of low-wax content heavy hydrocarbon oil

A technology of heavy hydrocarbon oil and dewaxing solvent is applied in the field of dewaxing of hydrocarbon oil, which can solve problems such as difficulty in removal, and achieve the effects of increasing the frequency of warm washing, increasing the filtration speed, and reducing the temperature difference of dewaxing.

Active Publication Date: 2013-03-06
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 heavy hydrocarbon oil
  • Solvent dewaxing method of low-wax content heavy hydrocarbon oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The raw oil is light deasphalted oil, and its properties are shown in Table 1. The mass ratio of microcrystalline wax to raw oil is 0.08:1, 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 4.2:1. The deoiling solvent is the same as the dewaxing solvent, with one dilution, and the solvent-to-oil ratio is 0.8:1 (relative to the raw material oil). Attached figure 1 The flow process preparation dewaxed oil, concrete process is as follows:

[0040](1) Add petroleum microcrystalline wax with a drop melting point of 82°C to the raw oil, heat to 100°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 30°C, filter to obtain deoiled fi...

Embodiment 2

[0047] The raw oil is light dehydrogenated oil, and its properties are shown in Table 1. The mass ratio of petroleum microcrystalline wax to raw oil is 0.02:1, the dewaxing solvent is butanone-toluene mixed solvent, the volume content of butanone is 75%, and the multi-point dilution process is adopted, and the total agent-oil ratio is 2.5:1. The deoiling solvent is the same as the dewaxing solvent, with one dilution, and the solvent-to-oil ratio is 1.3:1 (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 -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 to 15°C, filter ...

Embodiment 3

[0053] The raw material oil is lightly deasphalted solvent refined extracted oil, and its properties are shown in Table 1. The mass ratio of petroleum microcrystalline wax to raw oil is 0.12:1, the dewaxing solvent is butanone-toluene mixed solvent, the volume content of butanone is 65%, and the multi-point dilution process is adopted, and the total agent-oil ratio is 6.0:1. 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 75°C to the raw material oil, heat to 75°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 a diluting solvent to the w...

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Abstract

The invention relates to a solvent dewaxing method of low-wax content heavy hydrocarbon oil. The solvent dewaxing method comprises the following steps of mixing one or more raw material oil, petroleum microcrystalline wax and dewaxing solvents, cooling to a filtration temperature, filtering to obtain a dewaxed filtrate and dewaxed cerate, and removing the solvents in the dewaxed filtrate to obtain dewaxed oil, mixing the dewaxed cerate and a deoiling solvent, heating to a filtration temperature, and filtering to obtain a deoiled filtrate and deoiled cerate, wherein a petroleum microcrystalline wax droplet melting point is in a range of 67 to 92 DEG C and a mass ratio of the petroleum microcrystalline wax to the one or more raw material oil is in a range of (0.01: 1) to (0.25: 1). Compared with the conventional solvent dewaxing technology, the solvent dewaxing method provided by the invention can effectively remove wax in low-wax content heavy hydrocarbon oil, reduce a dewaxing temperature difference and improve a filtration speed.

Description

technical field [0001] The invention belongs to a method for dewaxing hydrocarbon oil. In particular, the present invention relates to a method for solvent dewaxing of low waxy heavy hydrocarbon oils. 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 the raw material oil with the dewaxing solvent, then...

Claims

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Application Information

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IPC IPC(8): C10G53/04C10G73/22
Inventor 丁洛王玉章管翠诗王子军
Owner CHINA PETROLEUM & CHEM CORP
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