Method for regenerating base oil by waste oil

Abstract

The invention discloses a method for regenerating base oil by waste oil, belonging to the technical field of waste oil regeneration. The problems that the waste oil regeneration rate is low, the oil quality of regenerated oil is poor, the environment is polluted and the like in the prior art are solved. The method for regenerating the base oil by the waste oil comprises a raw material pretreating part and a solvent refining part; wherein the raw material pretreating part comprises three phases of prefractionation, reduced pressure distillation cutting and molecular distillation; the solvent refining part comprises the steps of extraction, refined solution recovery, extracted solution recovery and solvent recovery; the molecular distillation refers to the process that tower bottom oil of a reduced pressure distillation tower is fed into a short-path distiller, and separating fuel oil and residues through two-stage molecular distillation under the condition that the pressure is 0.001 to 100Pa. The method provided by the invention is suitable for regenerating the base oil by the waste oil.

Description

technical field [0001] The invention relates to a method for regenerating base oil from waste oil, which belongs to the technical field of waste oil regeneration. Background technique [0002] The waste oil regeneration process is a technical problem that various countries are actively exploring and developing. The distillation-acid washing-clay refining process used at the beginning is a traditional and ancient process route. The process is relatively simple and the equipment cost is relatively low. Low, it can be applied to any type of waste oil. The amount of sulfuric acid added varies from oil to oil, generally below 10%. The amount of clay varies depending on the quality of the oil and the quality required for regenerated oil, and is generally below 10%. The yield of regenerated oil is generally below 80%, and the quality of regenerated oil is not high, so it can only be used as low-grade oil. The problem of acid slag produced by this process has not been completely so...

AI Technical Summary

Problems solved by technology

The yield of regenerated oil is generally below 80%, and the quality of regenerated oil is not high, so it can only be used as low-grade oil

The problem of acid slag produced by this process has not been completely solved so far, forming secondary pollution of waste acid slag, waste clay, and waste water

[0003] Regeneration of waste oil needs to go through two processes of pretreatment and refining. In the existing technology, when the base oil is separated by ordinary distillation, the amount of residue is large, resulting in waste of resources

The existing waste oil regeneration process includes the following types: 1. Flocculation-sedimentation-dehydration and deslagging method. This process uses simple physical methods for treatment, and only for some high-quality oil products. The waste oil is first settled to separate water After being mixed with other heavy components, it is directly pickled in the follow-up process and adsorbed by white clay, which saves heat energy and the process is relatively simple, but the pickling settlement is slow, takes a long time, and contains a certain amount of acid residue, which is harmful to the environment. Cause pollution, the quality of the produced oil is unstable, the quality is poor, and it cannot meet the requirements

2. Clay high-temperature contact acid-free regeneration process, the regenerated oil quality of this process is good, but because this process is essentially an improved process of distillation-clay refining process, there are large amounts of Clay > 10%, and the yield of lubricating oil base oil is relatively low Low generally <80%, heavy equipment corrosion, possible blockage of furnace tubes, harsh operating conditions and other factors, so it is not suitable for the comprehensive promotion of this process in our country

Images