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Method for reducing cloud point of base oil of hydrogenation dewaxing lubricating-oil

A lubricating oil base oil, hydrodewaxing technology, applied in the direction of only multi-stage serial refining process, etc., can solve the problems of difficult implementation, difficult base oil adsorbent bed, heavy base oil viscosity, etc.

Active Publication Date: 2005-11-02
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

Due to the competitive adsorption of oil molecules, the methods of the above two patents have limited effect on reducing cloud point. The viscosity is very high, for example, the viscosity of 150BS bright oil can reach 500mm at 40°C 2 / s or so, it is very difficult for the base oil to pass through the adsorbent bed, and these methods are difficult to implement industrially even if they are diluted with solvents
[0005] The properties of the flocs in the base oil are close to those of the saturated hydrocarbons, but in the conventional solvent dewaxing method, although some flocs are precipitated, they will quickly block the filter cloth during filtration, even if a small amount of liquid is barely absorbed. After filtration, the recovered base oil still has a high cloud point

Method used

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Experimental program
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Effect test

Embodiment 1

[0030] The composition of raw material, dilution solvent, dilution ratio, the filtration temperature of slurry are all identical with comparative example, and deflocculation aid is the mixture of oxidized microcrystalline wax and polyvinyl acetate (the trade mark of mixture is RFA6302, by Beijing Xingpu Fine Chemical Industry Co., Ltd. Technology Development Company), the mixing ratio is 2:1, and the dosage is 1.0% of the raw oil. The results of deflocculation with the addition of deflocculation aids are shown in Table 1.

Embodiment 2

[0032] Still use above-mentioned raw material oil, diluting solvent and filtration temperature are constant, select polyalpha-olefin (trade name is RFA6605, produced by Beijing Xingpu Fine Chemical Technology Development Company) and polypropylene (trade name is RFA6107, produced by Beijing Xingpu Fine Chemical Technology Development Co., Ltd.) Chemical Technology Development Company) mixture, the mixing ratio is 1:1, the dosage is 0.3% of the raw oil weight, and the properties of the deflocculated oil are shown in Table 1.

[0033] It can be seen from Table 1 that although the traditional solvent dewaxing method is used to treat the 120BS base oil raw material after hydrodewaxing, although the cloud point of the base oil can be reduced by 4 °C, it is still as high as 11 °C, and because it is extremely difficult to filter, the flocculent Matter and oil are seriously adhered on the filter cloth, and the yield is only 90.5%. After adding the deflocculation aid, the cloud point o...

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Abstract

A method for decreasing the cloud point of base oil of hydrotreated and dewaxed lubricating oil, mixing the raw material of base oil of hydrotreated and dewaxed lubricating oil with solvent and deflocculating agent, cooling, filtering in -5 to -30 Deg. C, and the filtrate being the cloud point decreased base oil of hydrotreated and dewaxed lubricating oil, thereinto, the content of deflocculating agent being the 0.002 to 5 percent of the raw material oil. With the method it can decrease obviously the cloud point and pour point of base oil, and increase the income ratio of base oil.

Description

technical field [0001] The invention relates to a method for reducing the cloud point of lubricating base oil. Background technique [0002] The conventional method of producing base oil from lubricating oil raw materials is to obtain base oil through solvent refining-solvent dewaxing-clay or hydrogenation supplementary refining of the raw material oil. The saturated hydrocarbon content of the base oil produced by this method is generally less than 90%, sulfur, nitrogen The content is higher, the color is darker, and it is difficult to produce high viscosity index base oil from intermediate base crude oil. With the development of industry, especially the development of the automobile industry, the quality requirements for base oil are getting higher and higher. On the one hand, people hope to produce base oil with high viscosity index from intermediate base crude oil; Very high or very high viscosity index base oils, which promote the development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G53/02
Inventor 杨文中丁洛王玉章
Owner CHINA PETROLEUM & CHEM CORP
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