Method for reducing lubricating oil basic oil cloud point
A lubricating oil base oil and lubricating oil material technology, which is applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems that cannot be removed, the cloud point of dewaxed oil is high, and is not very effective, so as to reduce the turbidity point effect
Inactive Publication Date: 2006-11-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0011] The method for reducing the cloud point of isomerized dewaxed lubricating oil base oil is not very effective. For example, US4428819 uses ZSM-5 molecular sieve dewaxing catalyst to carry out catalytic dewaxing of some heavy lubricating oils, and it is found that some petroleum waxes cannot be removed. , there is also the problem of high cloud point of dewaxed oil. Use acid clay or alumina to remove residual wax in isomerized dewaxed lubricating oil base oil, because there is competitive adsorption of some oil molecules, so it reduces isomerized dewaxed oil. Wax lube base oil cloud point also has very limited effect
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Embodiment
[0034] In the embodiment, the lubricating oil stock is pre-dewaxed by solvent firstly, and the pre-dewaxed oil is successively subjected to hydrogenation treatment for isomerization dewaxing. The operating conditions and test results are listed in Table 3. It can be seen from Table 3 that the cloud point of the final isomerized dewaxed oil dropped to -1°C.
[0035] Density (20℃), g / m 3
[0036] Isomerization dewaxing process conditions
[0037] Solvent pre-dewaxing process conditions
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Abstract
A method for lowering lubricating oil basic oil turbidity point, wherein the pour point of the dewaxed oil is -5 deg. C - 15 deg. C after the lubricating oil is dewaxed through the solvent, the pre-dewaxed oil is hydrotreated for lowering its sulfur and nitrogen content, the hydrotreated pre-dewaxed oil is dewaxed through isomerous process, obtaining lubricating oil basic with lowered oil turbidity point.
Description
technical field [0001] The present invention relates to a method for treating hydrocarbon oils with a refining process in the absence of hydrogen and at least one hydrotreating process. Background technique [0002] In addition to the production of lubricating oil base oil from lubricating oil stock, it is necessary to remove sulfur, nitrogen compounds and some polycyclic aromatic hydrocarbons to improve its viscosity index and oxidation stability, and to remove solid hydrocarbons to lower its freezing point or pour point. The solid hydrocarbon contained in lubricating oil is usually called wax, which is composed of linear alkanes and some non-linear alkanes. The most commonly used method to remove wax contained in lubricating oil is solvent dewaxing. Solvent dewaxing is to reduce the temperature of lubricating oil in the presence of dewaxing solvent to make the wax form solid crystals, and dissolve the oil through the solvent and dissolve the wax in a s...
Claims
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IPC IPC(8): C10G67/04
Inventor 韩鸿祖德光石亚华李大东
Owner CHINA PETROLEUM & CHEM CORP