Process for refining base oil by using regenerated waste oil from inclined wall wiped film vacuum distillation

Abstract

The invention relates to a process for refining base oil by using regenerated waste oil from inclined wall wiped film vacuum distillation, which belongs to the field of waste oil regeneration. The key technical point of the process is to emphasize the solution of the problem that the vacuum wiped film distillation technology in the prior art has drawbacks of large residual oil discharge amount and low product yield due to the fact that the distilled liquid film of a wiped film evaporator is easy to be scraped by a wiped film scraper blade to fall onto the bottom of the evaporator to be discharged. For solving the problem, the process adopts a technical scheme of high-temperature flocculation neutralization topping, inclined wall vacuum wiped film distillation, vacuum distillation tower rectification separation and vacuum high-temperature clay absorption refining. The technical key points of the process also include: the vacuum inclined wall wiped film vacuum distillation technology and a complete cone inclined wall wiped film evaporator are adopted; and technical processes that the cone barrel and heating evaporation liquid surface incline 2 to 30 degrees outwards, that two processes of distillation and gasification at different temperatures and the like are adopted; the discharge amount of residual oil is reduced; the product yield is increased; and the product quality is improved.

Description

Technical field [0001] Petrochemical industry, especially in the field of waste engine oil regeneration and refining base oil Background technique [0002] At present, domestic waste engine oil regeneration and refining base oil technologies are mostly head distillation-sulfuric acid refining-lime milk-clay adsorption refining process or head distillation-acid-clay process, etc. [0003] Foreign waste engine oil recycling and refining technology is relatively advanced, and thin-film distillation-clay technology or thin-film distillation-hydrofining technology is mostly used. According to the author Dai Junliang, Waste Lubricating Oil Regeneration (Third Edition), published by Sinopec Press, printed for the second time in August 2000, Chapter 15, Section 2, Wiping Film Distillation-Clay Process, the process product Yield is very low, and base oil fraction (65%), light oil fraction (7%) comprehensive yield (72%) residue oil discharge is but up to (28%) and contains lubricatin...

AI Technical Summary

Problems solved by technology

The existing wiping film distillation technology adopts a single gasification distillation temperature, and the barrel and evaporating liquid surface of the wiping film evaporator are vertical. When its accumulated amount exceeds its own adhesion capacity, it will fall off vertically to the bottom of the evaporator and be discharged; increasing the recovery and oil content of residual oil

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