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Solvent de-waxing method

A dewaxing and solvent technology, which is applied in the field of lubricating oil solvent dewaxing and vacuum heavy distillate oil solvent dewaxing with a specific formula of solvent, which can solve the problems of adverse effects of wax stability and difficult process, and achieve improvement The effect of deoiling wax yield and improving filtration speed

Active Publication Date: 2013-05-15
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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Examples

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Embodiment Construction

[0014] The properties of the dewaxing raw materials used in the examples of the present invention and the comparative examples are shown in Table 1.

[0015] The dewaxing solvent that the embodiment of the present invention adopts is methyl ethyl ketone / methyl tert-amyl ether mixed solvent, the dewaxing solvent that comparative example adopts is methyl ethyl ketone / toluene mixed solvent and methyl ethyl ketone / methyl tert-butyl ether mixed solvent, solvent composition sees each Examples and Comparative Examples.

[0016] 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 70°C, 30°C, -10°C and -22°C.

[0017] See Tables 2-5 for the operating conditions and results of solvent dewaxing in the embodiments of the present invention and comparative examples.

[0018] Table 1 Properties of dewaxing feedstock.

[0019] project Minus second-line d...

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PUM

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Abstract

The invention relates to a solvent de-waxing method. According to the invention, a solvent is added into a fused de-waxing raw material, an obtained mixture is cooled to a de-waxing temperature, a multi-point dilution method or a one-step full dilution method is employed for addition of the solvent, and filtration and separation are carried out at the de-waxing temperature so as to obtain de-waxed oil and de-waxed cerate, wherein the solvent is a mixture of tert amyl methyl ether and C3-C6 aliphatic ketone. Compared with the prior art, the method provided by the invention can improve a filtration speed of solvent de-waxing and yield of the de-waxed oil.

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 using a solvent with a specific formula. 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 production of lubricating oil base oil from lubricating oil raw materials must remove the solid hydrocarbons in order to lower its freezing point or pour point. Said solid hydrocarbons are usually referred to as waxes, mainly long-chain normal alkanes. [0003] 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. The dewaxing solvent is mostl...

Claims

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Application Information

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IPC IPC(8): C10G73/12C10G53/04C10M177/00
Inventor 王士新袁平飞李殿昭
Owner CHINA PETROLEUM & CHEM CORP
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