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Solvent dewaxing method for low waxy hydrocarbon oil

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

Active Publication Date: 2014-08-20
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 for low waxy hydrocarbon oil
  • Solvent dewaxing method for low waxy hydrocarbon oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]The raw material oil is minus four-line distillate oil, and its properties are shown in Table 1. The mass ratio of dewaxing aid to raw oil is 0.07:1, the dewaxing solvent is a butanone-toluene mixed solvent, the volume content of butanone is 50%, and the multi-point dilution process is adopted, the total agent-oil ratio is 3.8:1. 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:

[0042] (1) Use paraffin wax with a melting point of 68°C as a dewaxing aid

[0043] Paraffin wax with a melting point of 68°C is added to the raw oil as a dewaxing aid, heated to 75°C, fully melted and mixed evenly, and each dilution solvent is added in sequence. Cool to -15°C, filter to obtain dewaxed filtrate and dewaxed wax paste, and obtain dewaxed oil after removing the solvent from the filtrate. ...

Embodiment 2

[0051] The raw material oil is refined oil with furfural reduction, and its properties are shown in Table 1. The mass ratio of the dewaxing aid to the raw oil is 0.02:1, the dewaxing solvent is a butanone-toluene mixed solvent, the volume content of butanone is 75%, the multi-point dilution process is adopted, and the total agent-oil ratio is 2.0:1. 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:

[0052] (1) Use paraffin wax with a melting point of 56°C as a dewaxing aid

[0053] Paraffin wax with a melting point of 56°C is added to the raw oil as a dewaxing aid, heated to 90°C, fully melted and mixed evenly, and each dilution solvent is added in sequence. Cool to -20°C, filter to obtain dewaxed filtrate and dewaxed wax paste, and obtain dewaxed oil after removing solvent from the ...

Embodiment 3

[0059] The raw material oil is extracted oil refined by minus the third-line solvent, and its properties are shown in Table 1. The mass ratio of dewaxing aid to raw oil is 0.12:1, the dewaxing solvent is butanone-toluene mixed solvent, the volume content of butanone is 65%, the multi-point dilution process is adopted, and the total agent-oil ratio is 5.5:1. 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). Attached figure 1 The flow process preparation dewaxed oil, concrete process is as follows:

[0060] (1) Use paraffin wax with a melting point of 62°C as a dewaxing aid

[0061] Paraffin wax with a melting point of 62°C is added to the raw oil as a dewaxing aid, and the paraffin wax is heated to 80°C, fully melted and mixed evenly, and then diluted solvents are added successively. Cool to -10°C, filter to obtain a dewaxed filtrate and a dewaxed wax paste, and obtain a dewa...

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Abstract

The invention relates to a solvent dewaxing method for low waxy hydrocarbon oil. The method includes: mixing raw oil, dewaxing auxiliaries and dewaxing solvent, cooling the mixture to a filtering temperature, filtering to obtain filtrate and cerate, and removing the solvent from the filtrate to obtain dewaxed oil, wherein C17-C100 n-alkane mass content in the dewaxing auxiliaries is larger than or equal to 40%, and the mass ratio of the dewaxing auxiliaries to the raw oil ranges from 0.01:1 to 0.30:1. Compared with conventional solvent dewaxing techniques, the solvent dewaxing method has the advantage that the low waxy hydrocarbon oil can be dewaxed more effectively to lower dewaxing temperature difference and increase filtering speed.

Description

technical field [0001] The invention belongs to a method for dewaxing hydrocarbon oil. In particular, the present invention relates to a process for solvent dewaxing of low waxy 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. Industrially, the wax products after wax deoiling are divided into paraffin wax and microcrystalline wax. Hydrocarbons, and contain 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 gradually cool it down, and use the property of the solvent to be insoluble or slightly soluble to the wax component at low temperature while dissolving...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G73/08C10G73/12C10G73/10
Inventor 丁洛王玉章管翠诗王子军
Owner CHINA PETROLEUM & CHEM CORP
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