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Solvent dewaxing method of low-wax content heavy hydrocarbon oil

A technology of heavy hydrocarbon oil and dewaxing solvent, which is applied in the field of dewaxing of hydrocarbon oil and can solve problems such as difficult removal

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

[0031] The raw oil is light deasphalted oil, and its properties are shown in Table 1. The drop melting point of microcrystalline wax is 80 ℃, and the oil content of microcrystalline wax is 1.2%, and the mass ratio of microcrystalline wax and stock oil is 0.12: 1; Dewaxing solvent is butanone-toluene mixed solvent, and the volume content of butanone is 65%; the multi-point dilution process is adopted, and the total agent-oil ratio is 2.5:1. Attached figure 1 The flow process preparation dewaxed oil, concrete process is as follows:

[0032] Add petroleum microcrystalline wax to raw oil, heat to 85°C, fully melt and mix well, then add dilution solvents successively. Cool to -10°C, filter to obtain dewaxed filtrate and dewaxed wax paste, dewaxed oil is obtained from the filtrate after solvent removal, and oily wax is obtained from the wax paste after solvent removal. The dewaxing results are shown in Table 2.

Embodiment 2

[0036] The raw oil is light dehydrogenated oil, and its properties are shown in Table 1. The drop melting point of microcrystalline wax is 75 ℃, and the oil content of microcrystalline wax is 3.0%, and the mass ratio of microcrystalline wax and stock oil is 0.07: 1; Dewaxing solvent is butanone-toluene mixed solvent, and the volume content of butanone is 75%, the multi-point dilution process is adopted, and the total agent-oil ratio is 6.0:1. Attached figure 1 The flow process preparation dewaxed oil, concrete process is as follows:

[0037] Add petroleum microcrystalline wax to the raw material oil, heat to 75°C, fully melt and mix evenly, then add each dilution solvent in turn. Cool to -15°C, filter to obtain dewaxing filtrate and dewaxed wax paste, obtain dewaxed oil after removing solvent from filtrate, and obtain oily wax after removing solvent from wax paste. The dewaxing results are shown in Table 2.

Embodiment 3

[0041] The raw material oil is furfural extracted oil from light deasphalted oil, and its properties are shown in Table 1. The drop melting point of microcrystalline wax is 82 ℃, and the oil content of microcrystalline wax is 1.8%, and the mass ratio of microcrystalline wax and raw material oil is 0.02: 1; Dewaxing solvent is butanone-toluene mixed solvent, and the volume content of butanone It is 75%, and the multi-point dilution process is adopted, and the total agent-oil ratio is 4.0:1. Attached figure 1 The flow process preparation dewaxed oil, concrete process is as follows:

[0042]Add petroleum microcrystalline wax to raw oil, heat to 100°C, fully melt and mix evenly, then add each dilution solvent in turn. Cool to -20°C, filter to obtain dewaxed filtrate and dewaxed wax paste, dewaxed oil is obtained from the filtrate after solvent removal, and oily wax is obtained from the wax paste after solvent removal. The dewaxing results are shown in Table 2.

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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 filtrate and cerate, and removing the solvents in the filtrate to obtain dewaxed oil, 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). 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 products after wax deoiling are divided into paraffin wax and microcrystalline wax. 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 solvent's property of insoluble or slightly soluble to the wax component at low temperature and dissolve other components to make the wax crystallize in the dewaxing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G53/04C10G73/22
Inventor 丁洛王玉章管翠诗
Owner CHINA PETROLEUM & CHEM CORP
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