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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: 2012-10-31
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

[0033] The raw material oil is extracted oil refined by minus fourth-line solvent, and its properties are shown in Table 1. The dewaxing aid is paraffin wax with a melting point of 62° C., and the paraffin oil content is 1.2%, and the mass ratio of the dewaxing aid to the raw oil is 0.12: 1; the dewaxing solvent is a butanone-toluene mixed solvent, and the volume content of butanone is 50%; the multi-point dilution process is adopted, and the total agent-oil ratio is 2.0:1. Prepare dewaxed oil by the flow process of accompanying drawing 1, and concrete process is as follows:

[0034] Add the dewaxing aid to the raw oil, heat to 75°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

[0038] The raw material oil is the minus third-line distillate oil, and its properties are shown in Table 1. The dewaxing aid is paraffin wax with a melting point of 56° C., the wax oil content is 2.0%, and the mass ratio of the dewaxing aid to the raw oil is 0.07: 1; the dewaxing solvent is a 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 3.5:1. Prepare dewaxed oil by the flow process of accompanying drawing 1, and concrete process is as follows:

[0039] Add the dewaxing aid to the raw oil, heat to 80°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.

Embodiment 3

[0043]The raw material oil is furfural refined oil of light deasphalted oil, and its properties are shown in Table 1. The dewaxing aid is paraffin wax with a melting point of 68° C., the wax oil content is 0.5%, and the mass ratio of the dewaxing aid to the raw oil is 0.02: 1; the dewaxing solvent is a 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 5.5:1. Prepare dewaxed oil by the flow process of accompanying drawing 1, and concrete process is as follows:

[0044] Add the dewaxing aid to the raw oil, heat to 90°C, fully melt and mix well, 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.

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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. Using the solvent dewaxing method can more effectively dewaxing the low waxy hydrocarbon oil 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, wax products after wax deoiling are divided into paraffin wax and microcrystalline wax. Paraffin wax is mainly composed of normal paraffins and a certain amount of isoparaffins, while microcrystalline waxes contain normal paraffins, isoparaffins and alkyl cycloalkanes. , and contains a certain amount of alkyl aromatic hydrocarbons. 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...

Claims

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Application Information

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