Static mixed rotational flow separation and extraction process of regenerative base oil N-methyl pyrrolidone

Abstract

The invention relates to a static mixed rotational flow separation and extraction process of regenerative base oil N-methyl pyrrolidone, comprising the following steps in sequence: (a) carrying out sedimentation of used oil and removing moisture and solid impurities; (b) filtering by a filter, and removing tiny solid particles and colloids; (c) adding sodium hydroxide solution and flocculating; (d) removing floccules and residual sodium hydroxide solution; (e) carrying out reduced pressure distillation by a distiller, and collecting distillate oil; (f) mixing the distillate oil with organic solvent by a static mixer on line; (g) separating out raffinate oil and raffinate oil containing organic solvent from mixed liquor by a swirler; (h) carrying out the reduced pressure distillation on the raffinate oil by a climbing film evaporator, and removing the organic solvent in the raffinate oil; and (i) carrying out the reduced pressure distillation by a molecule (short range) distiller, removing residual organic solvent and peculiar smell gas, and obtaining the regenerative base oil. The separation and extraction process provided by the invention has the advantages of conciseness in procedure, safety in operation, less equipment investment, high product yield, energy conservation, environmental friendliness and the like.

Description

(1) Technical field [0001] The invention relates to a fine chemical product production process, in particular to a regeneration base oil N-methylpyrrolidone static mixing cyclone separation extraction process. (2) Background technology [0002] Lubricating oil is widely used in transportation, mechanical processing and other industries. Due to the influence of various unfavorable factors under the working conditions, it will gradually lose its use function and application value, and must be replaced. The replaced lubricating oil is called waste engine oil. It is a new way of environmental protection, energy saving and comprehensive utilization of resources to prepare recycled base oil from waste engine oil through certain treatment methods, and then reconcile it into lubricating oil for recycling. [0003] At present, the "vacuum distillation-sulfuric acid-clay" process is commonly used in the field of domestic waste engine oil regeneration, and the most advanced process is...

AI Technical Summary

Problems solved by technology

"Vacuum Distillation-Sulfuric Acid-clay" process has low yield and poor quality of base oil regeneration, and there is a large amount of SO in the regeneration process 2 Waste gas, waste sulfuric acid slag, waste white clay slag, and waste washing liquid are discharged, causing serious secondary pollution, which is not allowed by the national environmental protection regulations and is an obsolete process technology

In the "vacuum distillation-furfural extraction-white clay" process, furfural extraction is to mix distillate oil with furfural in the extraction tower, which requires a relatively large investment in equipment for the extraction tower and consumes power; it is easy to produce emulsification during furfural extraction phenomenon, separation is difficult; furfural extraction has a high ratio of oil to oil, and the yield of regenerated base oil is low; furfural has certain toxicity, which is harmful to the human body and the environment, and can no longer meet the requirements of environmental protection; It not only reduces the yield of recycled base oil and increases the production cost, but also the discarded white clay will cause certain harm to the environment