Preparation method for base oil of aluminium product rolling oil

Abstract

The invention discloses a preparation method for base oil of aluminium product rolling oil, and belongs to the technical field of lubricating oil preparation. The method comprises the following steps: (1) raw oil and hydrogen are mixed and then pass through a hydrogenation reaction unit to obtain hydrogenated oil; (2) the hydrogenated oil enters the upper part of a desulfurizing tower, steam stripping is performed to obtain desulfurized oil by means of filling superheated steam into the middle lower part of the desulfurizing tower, the desulfurized oil is heated and then enters a desulfurization reactor, and the desulfurization reactor is filled with zinc oxide desulfurizer; and (3) materials coming out of a hydrogen sulfide removing device enter a fractional device for fractionation so as to obtain different models of base oil of the aluminium product rolling oil. The base oil of aluminium product rolling oil prepared through the method disclosed by the invention has low viscosity as well as low and stable sulphur content. According to the invention, pollution to the environment is less, corrosion on the fractionating column equipment is low, device fluctuation and even unscheduled shutdown caused by pipeline blockage are avoided, and production efficiency is improved; and moreover, the accuracy of the fractionating column is high, so that viscosity of the product is lowered.

Description

technical field [0001] The invention belongs to the technical field of lubricating oil preparation. Background technique [0002] In the prior art, the production of aluminum rolling oil has the following problems: [0003] 1. The viscosity of aluminum rolling oil products is high, which affects its use in aluminum plants. The viscosity of the base oil of 1# aluminum rolling oil is greater than 1.71mm 2 / s, and the aluminum factory confirms whether to change the oil according to the viscosity of the rolling oil during use. Generally, the index of the aluminum factory is not more than 1.90 mm 2 / s; 2# aluminum rolling oil base oil viscosity is greater than 2.31mm 2 / s, and the aluminum factory confirms whether to change the oil according to the viscosity of the rolling oil during use. Generally, the index of the aluminum factory is not more than 2.60 mm 2 / s; the above analysis shows that the ex-factory viscosity of base oil directly affects the frequency of base oil repl...

AI Technical Summary

Problems solved by technology

[0004] 2. The sulfur content of aluminum plate and foil rolling oil products is unstable and high, resulting in unqualified corrosion

The desulfurization system adopts acid-base refining, which pollutes the environment greatly, and the alkali slag is not easy to handle; the sulfur content of the product is not easy to control, fluctuating from high to low; the product loss is too large, and the operation is difficult; in summary, the acid-base refining process directly leads to oil products Unstable sulfur content

[0005] 3. The corrosion on the top of the fractionation tower is too large, and the pipeline is often blocked, resulting in device fluctuations and even unplanned shutdowns

Due to the high sulfur content of the fractionation tower feed, the probability of sulfur corrosion is increased, and the corrosion of the fractionation tower is mainly concentrated in the top system. Due to the existence of clear water, the top cooler, reflux tank, reflux pump, top reflux Corrosion of the line etc. is obviously heavy, the sewage line of the dehydration tank of the reflux tank is often blocked, and the treatment often causes operational fluctuations during the start-up period. Moreover, because the oil at the top of the tower is relatively volatile, the reflux line at the top of the tower is blocked, which is very dangerous to deal with, and even causes the device to be unplanned. shutdown

[0006] The separation accuracy of the fractionating tower is low, resulting in a wide distillation range of some products