Solvent dewaxing method by use of dewaxing assistant

A technology of dewaxing aids and dewaxing solvents, which is applied in the field of solvent dewaxing of vacuum heavy distillate oil and lubricating oil solvent dewaxing using additives, which can solve problems such as difficult process and adverse effects of wax stability, etc. Achieve the effects of increasing filtration speed, good oil and wax separation effect, and increasing yield

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the oxygen molecules and double bonds in the additives are mixed into the wax, which has an adverse effect on the stability of the wax. It must b

Method used

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  • Solvent dewaxing method by use of dewaxing assistant
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  • Solvent dewaxing method by use of dewaxing assistant

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Embodiment Construction

[0013] The properties of the dewaxing raw materials used in the examples of the present invention and the comparative examples are shown in Table 1.

[0014] The dewaxing solvent used in the examples and comparative examples of the present invention is a mixed solvent of methyl ethyl ketone-toluene, and the solvent composition is shown in each example and comparative example.

[0015] The solvent dilution in the solvent dewaxing process of the embodiment of the present invention and the comparative example adopts four-point dilution, and the dilution points are 75°C, 35°C, -10°C and -20°C.

[0016] The auxiliary agent that the embodiment of the present invention adopts is:

[0017] Additive 1: 590-700°C fraction of Fischer-Tropsch synthetic wax, with an average molecular weight of 735 and a dropping point of 98°C.

[0018] Additive 2: Fischer-Tropsch synthetic wax >700°C fraction, average molecular weight 990, dropping point 108°C.

[0019] See Tables 2-5 for the operating c...

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Abstract

The invention discloses a solvent dewaxing method by the use of a dewaxing assistant, comprising the following steps of: mixing molten dewaxing materials and a dewaxing assistant, adding a dewaxing solvent, and cooling to a dewaxing temperature. The addition mode of the solvent is a multipoint dilution method or a one-time full dilution method. Dewaxing oil and dewaxing cerate can be obtained by filtration and separation at the dewaxing temperature. The dewaxing assistant is Fischer-Tropsch synthetic wax with high-melting point. According to the invention, the filtration speed and the dewaxing oil yield are raised, and simultaneously the applied assistant needs not to be separated from wax and generates no unfavorable impact on wax properties.

Description

technical field [0001] The invention relates to a method for solvent dewaxing of lubricating oil, in particular to a method for dewaxing lubricating oil by using an auxiliary agent. The method of the present invention is suitable for solvent dewaxing of vacuum distillate oil, especially for solvent dewaxing of vacuum heavy distillate oil. asphalt oil. Background technique [0002] The dewaxing of lubricating oil mainly includes solvent dewaxing and catalytic dewaxing. The conventional solvent dewaxing method is to add solvent to the dewaxing raw material for dilution, cool to low temperature to crystallize the wax, and then filter to separate the oil and wax. [0003] In waxy petroleum fractions, the petroleum waxes contained are mainly long-chain normal paraffins and isoparaffins, and the content of isoparaffins increases with the increase of boiling point. Normal alkanes form large, intact crystals when precipitated from a solvent, whereas isoparaffins do not form intact...

Claims

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Application Information

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IPC IPC(8): C10G73/22
Inventor 王士新袁平飞李殿昭
Owner CHINA PETROLEUM & CHEM CORP
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