Clay refining method with reduced cost for dewaxed oil

Abstract

The invention discloses a clay refining method with reduced cost for dewaxing oil. The method comprises the steps of: (1) sending dewaxed oil subjected to dewaxing to a heating device, and heating to 155-180 DEG C; (2) starting an air valve in an exhaust pipe of a blending tank for exhaust; sending dewaxing oil at 155-180 DEG C to the blending tank, so as to exhaust water vapor and volatile components in the heated dewaxed oil from the exhaust pipe; adding clay to the blending tank; and mixing; (3) sending the mixture of dewaxed oil and clay treated in the step (2) to a refining tower and standing for 30-40 min; and (4) sending the refined mixture of dewaxed oil and clay to a filter for filtering, so as to obtain lubricating oil base oil. On the premise of acquiring lubricating oil base oil with the same quality as the one prepared from the existing technology, the method employs conventional routine equipment in the whole refining process of dewaxed oil, so as to greatly reducing investment cost on equipment in large-scale refining production.

Description

technical field [0001] The invention relates to a lubricating oil refining method, in particular to a clay refining method for dewaxed oil which can reduce costs. Background technique [0002] Most domestic lubricating oil production adopts the "old three sets" of furfural refining, solvent dewaxing and clay refining to produce API HVI Ⅰ base oil. Among them, the refining of white clay is to use the adsorption capacity of white clay to remove a small amount of gum, asphaltene, nitride, unsaturated hydrocarbon, sulfide, organic acid and trace solvent, water, colored Substances and other impurities are adsorbed on it and removed to improve the oxidation stability and color of the oil. It is to make the mechanical impurities, water acid value, anti-emulsification performance, oxidation stability and other physical and chemical indicators of various base oils meet the specifications. important means. [0003] The traditional white clay refining process is to first add white cl...

AI Technical Summary

Problems solved by technology

Its disadvantages are: (1) This process is for heating the mixture of clay and oil. Since clay is a solid substance, it is very easy to deposit in the oil, and the oil temperature of the lubricating oil after dewaxing is 80°C. Between ~120°C, after adding clay, the oil becomes very viscous. Therefore, it is easy to cause the dewaxed oil to block the tubular oil-flowing equipment such as the heating furnace or heat exchanger, affecting the normal production of the equipment, and even causing the equipment to stop working.

However, special equipment such as spiral tube heating furnaces are bulky, expensive and inefficient, resulting in high production costs

In addition, because the mixture contains white clay, the temperature rises slowly, and a large amount of fuel is required. The spiral tube heating furnace is used for heating, and a special person is required to watch the fire, which is very expensive.

However, if a steam heater is used to replace the fuel oil heating furnace, the steam heater must use a special anti-blocking steam sleeve heater. However, due to the anti-blocking design of this type of heater, not only the equipment investment is large, but also the thermal efficiency is low. , using a large amount of water vapor, resulting in the fuel cost is still quite high

(2) The furnace cavity of the heating furnace is too high locally, and the oil processing capacity is large, and uneven heating causes local overheating, which leads to oil oxidation or even coking, and impurities such as asphalt and colloid in the oil increase, which greatly reduces the effect of clay refining. The oxidation stability and other indicators of the obtained lubricating oil base oil are reduced, the color is black, and the quality of the oil product is reduced

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