Solvent dewaxing method for low waxy 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: 2015-04-29
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

[0031] The extracted oil is used as the raw material, 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 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 95%; the multi-point dilution process is adopted, and the total diluent-oil ratio is 2:1. Prepare dewaxed oil by the flow process of accompanying drawing 1, and concrete process is as follows:

[0032] Add petroleum microcrystalline wax to raw oil, heat to 80°C, fully melt and mix evenly, then add each dilution solvent in turn. 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 material is tri-distillate oil, and its properties are shown in Table 1. The drop melting point of microcrystalline wax is 84 ℃, and the oil content of microcrystalline wax is 1%, 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 70%, using multi-point dilution technology, the total diluent oil ratio is 3.5:1. Prepare dewaxed oil by the flow process of accompanying drawing 1, and concrete process is as follows:

[0037] 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 -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 is tetrahydrotreated 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 3%, and the mass ratio of microcrystalline wax and raw material oil is 0.01: 1; Dewaxing solvent is butanone-toluene mixed solvent, and the volume content of butanone 50%, using multi-point dilution process, the total diluent oil ratio is 6:1. Prepare dewaxed oil by the flow process of accompanying drawing 1, and concrete process is as follows:

[0042]Add petroleum microcrystalline wax to the raw material oil, heat to 90°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 for low waxy hydrocarbon oil. The method includes mixing raw oil of a crude oil vacuum distillate fraction section, petroleum microcrystalline wax and a 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 the drop melting point of the petroleum microcrystalline wax is 67 DEG C to 92 DEG C, the mass ratio of the petroleum microcrystalline wax to the raw oil ranges from 0.005:1 to 0.2:1. Though use of the solvent dewaxing method, wax in the low waxy hydrocarbon oil can be more effectively removed, the dewaxing temperature difference can be reduced and the filtering speed 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 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 com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/04C10G73/22
Inventor 丁洛管翠诗王玉章陈国成闫亮
Owner CHINA PETROLEUM & CHEM CORP
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