Free-pollution cyclic regeneration pre-treatment technology of waste lubricating oil

Abstract

The invention provides a free-pollution cyclic regeneration pre-treatment technology of waste lubricating oil. The process comprises the steps of chemical reaction dechloridation, hydrogenation heat treatment, atmospheric flashing, propane refining and reduced pressure distillation. Through the chemical reaction dechloridation, the problems about corrosion of organic chloride to the subsequent devices, pipeline blockage and catalyst poisoning during regeneration can be solved; through hydrogenation heat treatment, additives in the waste lubricating oil can be destroyed, ash formation matter istransformed into residues which can be removed through filtration, and the problems are solved that during propane refining, an interface is not clear and separation is difficult, and during reducedpressure distillation, fractionating tower plates scale. After light oil is drawn out through atmospheric flashing, the additives, metal salt, oxide condensation compounds, colloid and asphaltenes inthe waste lubricating oil are removed through propane refining, and finally, light components are effectively separated from the base oil through reduced pressure distillation. By means of the technology, undesired components in the waste lubricating oil can be effectively removed, high-quality raw materials are provided for subsequent hydrogenation refining, and long-period running of the subsequent hydrogenation device is ensured.

Description

technical field

[0001] The invention belongs to the fields of hazardous waste recovery, environmental protection and petrochemical industry, and relates to a pollution-free continuous regeneration pretreatment process of waste lubricating oil. Background technique

[0002] During the process of mechanical transmission and lubrication, lubricating oil is subjected to high-temperature catalytic oxidation, which will produce oxidized condensates, colloids, asphaltene, metal salts produced by organic acid corrosion of metals, and will also be mixed with external environment and mechanical wear. Metal powder, water, dust, oil and other impurities contaminate lubricating oil, making it reduce or even lose the functions of lubrication, auxiliary cooling, rust prevention, cleaning, sealing and buffering. Since a large amount of valuable lubricating oil base oil in waste lubricating oil has not aged and deteriorated, the recycling and utilization of waste lubricating oil is not only ...

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