Method for producing naphtha, diesel oil and lubricant base oil by using used lubrication oil

Abstract

The invention discloses a method for producing naphtha, diesel oil and lubricant base oil by using used lubrication oil. The method mainly comprises the following steps of distilling the used lubrication oil in an atmospheric column and a vacuum tower; hydrofining through a hydrogenation reactor; rectifying in a rectifying column; and finally discharging the naphtha from the top of the rectifying column, discharging the diesel oil from the side line, and discharging the lubricant base oil from the bottom part. The method also comprises the step of preprocessing the used lubrication oil in early stage, wherein the step specifically comprises the following substeps: adding the used lubrication oil into a flocculation sedimentation tank to perform sedimentation, carrying out secondary sedimentation on the used lubrication oil in a raw material buffering tank after most of water content and impurities are removed in the flocculation sedimentation tank, and finally transferring the used lubrication oil from the raw material buffering tank into an atmospheric distillation column after the water content and impurities are removed by the secondary sedimentation. According to the method, the water content and impurities in the used lubrication oil are basically removed by two-times sedimentation, and thus trays of the atmospheric distillation column and a pressure-reduced distillation column cannot be blocked, long-term continuous production can be realized, and the production efficiency can be improved.

Description

technical field [0001] The invention relates to a method for producing naphtha, diesel oil and lubricating oil base oil from waste lubricating oil. Background technique [0002] The output of lubricating oil in my country is more than 5 million tons per year. Due to changes in the composition and physical and chemical properties of lubricating oil during use, it needs to be replaced. About 2 million tons of waste lubricating oil are produced every year. The resource utilization of waste lubricating oil can not only To make up for the lack of non-renewable petroleum resources, to meet increasingly stringent environmental protection requirements, and to produce high-quality lubricating oil base oils and clean fuels through reprocessing technology, increase the added value of waste lubricating oils and expand product usage. [0003] The current method for producing naphtha, diesel oil and lubricating oil base oil from waste lubricating oil includes the step of distilling waste l...

AI Technical Summary

Problems solved by technology

The method for producing naphtha, diesel oil and lubricating oil base oil from the above-mentioned waste lubricating oil, because the waste lubricating oil contains a large amount of impurities, the trays of the atmospheric distillation tower and the vacuum distillation tower are easy to coke, causing frequent interruptions in production, which affects Production efficiency of waste lubricating oil to produce naphtha, diesel and lubricating base oil

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