Method for pretreating waste mineral oil and performing hydrogenation regeneration to produce lubricating base oil

Abstract

The invention discloses a method for pretreating waste mineral oil and performing hydrogenation regeneration to produce lubricating base oil. The method is characterized in that: pretreatment of the waste mineral oil sequentially comprises the following steps of performing sedimentation dehydration, washing, centrifuging by using a disc-type centrifuge, centrifuging by using a horizontal centrifuge, evaporating by using a scraping film evaporator, and performing reduced pressure distillation; preheated lubricating base oil enters a hydrogenating device, enters a pre-hydrogenation protection reactor first and then enters the hydrorefining reactor to produce the high-grade lubricating base oil. By the method for pretreating the waste mineral oil and performing hydrogenation regeneration to produce the lubricating base oil, various non-ideal components in the waste lubricating oil can be effectively removed only after pretreatment provided by the invention; the method is simple in steps and is convenient to operate; manpower and material resources are saved; the lubricating base oil product is good in quality and high in yield, wastes are not produced, and no pollution is caused to the environment; operating conditions are relatively mild, using requirements on equipment are lowered, the regenerating efficiency is increased by 10-15%, continuous operation of the equipment is facilitated, and pollution of the waste oil on the environment and shortage of a petroleum product are relieved.

Description

technical field [0001] The invention relates to a method for pretreatment of waste mineral oil-hydrogenation to regenerate lubricating oil base oil, which belongs to the field of lubricating oil preparation. Background technique [0002] In terms of composition, lubricating oil is composed of 80% -90% base oil and 10% - 20% additives. The main chemical composition is a mixture of various hydrocarbons and a small amount of non-hydrocarbons. However, after the lubricating oil has been used for a period of time, the performance of the lubricating oil has deteriorated due to physical, chemical or human factors, such as aldehydes, ketones, resins, asphalt colloidal substances, carbon black and organic acids, salt, water, metal shavings, etc. Contaminated impurities can no longer be used and become waste lubricating oil. In fact, waste lubricating oil is not waste, but only a few percent of the used lubricating oil has really deteriorated. Therefore, how to effectively remove the...

AI Technical Summary

Problems solved by technology

Afterwards, carry out short-path distillation, at least through the following two stages of distillation in sequence. The operating conditions of the first-stage short-path distillation are temperature 150-250, vacuum degree 30-100Pa, fractional distillation of light lubricating oil base stock, and then the material enters the second-stage short-path distillation, Its operating conditions are temperature 180~260, vacuum degree 5~20pa, medium-quality lubricating oil base oil is evaporated, and residual oil is discharged from the bottom of the tower. The purity of regenerated lubricating oil after the pretreatment method of this technical scheme is not high, and the regeneration efficiency is not high. High, and the pretreatment steps are not easy, which is not conducive to industrialized integrated production