Solvent dewaxing method by use of dewaxing assistant
A technology of dewaxing additives and dewaxing solvents, which is applied in the field of lubricating oil solvent dewaxing using additives and solvent dewaxing of vacuum heavy distillate oil, which can solve the problems of adverse effects of wax stability and difficult process, etc. Achieve good oil and wax separation effect, increase filtration speed and increase yield
Active Publication Date: 2014-07-23
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 be removed before it can be applied to some strict wax applications, and it will be a comparison to separate the additives from the wax. difficult process
Method used
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[0013] See Table 1 for the properties of the dewaxing raw materials used in the Examples and Comparative Examples of the present invention.
[0014] The dewaxing solvent used in the examples and comparative examples of the present invention is a methyl ethyl ketone-toluene mixed solvent, and the solvent composition is shown in the examples and comparative examples.
[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 used in the embodiment of the present invention is:
[0017] Auxiliary 1: 590~700℃ fraction of Fischer-Tropsch synthetic wax, average molecular weight 735, drop point 98℃.
[0018] Auxiliary 2: The fraction> 700℃ of Fischer-Tropsch synthetic wax, with an average molecular weight of 990 and a dropping point of 108℃.
[0019] The operating conditions and results of solvent dewaxing in t...
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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 solvent dewaxing of lubricating oil by using an auxiliary agent. The method of the present invention is suitable for solvent dewaxing of vacuum distillate oil, especially suitable for solvent dewaxing of vacuum heavy distillate oil. The vacuum heavy distillate oil mentioned in the present invention includes reduced fourth-line distillate oil and vacuum residue light dewaxing. 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 to dilute, cool to a low temperature to make the wax crystallize, and then filter to separate the oil and wax. [0003] In the waxy petroleum fraction, the petroleum wax contained is mainly long-chain normal paraffins and isoparaffins, and as the boiling point increas...
Claims
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IPC IPC(8): C10G73/22
Inventor 王士新袁平飞李殿昭
Owner CHINA PETROLEUM & CHEM CORP