Process for hydrogenating treatment of waste lubricating oil by tandem type double-boiling-bed reactors

Abstract

The invention relates to a hydrogenating treatment process of waste lubricating oil and particularly relates to a process for hydrogenating treatment of the waste lubricating oil by tandem type double-boiling-bed reactor. The process is characterized by comprising the following steps: a spherical prehydrogenating treatment catalyst is added into a first boiling-bed reactor, and a spherical main hydrogenating treatment catalyst is added into the second boiling-bed reactor; after being pressurized, the pretreated waste lubricating oil enters the first boiling-bed reactor from the bottom part ofthe first boiling-bed reactor, and under the action of the spherical prehydrogenating treatment catalyst, metal ions, colloid, asphaltene and residual carbon are removed by hydrogenation; the lubricating oil pretreated by hydrogenation and hydrogen flow out of an outlet at the upper part of the first boiling-bed reactor, and enter the second boiling-bed reactor from the bottom part of the second boiling-bed reactor, and under the action of the spherical main hydrogenating treatment catalyst, the deep hydrogenation refining is carried out to remove oxygen, sulfur, nitrogen and heterocyclic aromatic hydrocarbons; after the following fractional-distillation treatment for the lubricating oil refined by hydrogenation, excellent naphtha, diesel fraction, basic lubricating-oil fraction and a little amount of asphalt heavy component oil can be obtained.

Description

technical field [0001] The invention relates to a waste lubricating oil hydrotreating process, in particular to a process for hydrogenating waste lubricating oil in series double ebullating bed reactors. Background technique [0002] Waste lubricating oil comes from internal combustion engine lubricating oil, gear lubricating oil, hydraulic lubricating oil, total loss system lubricating oil, compressor lubricating oil, steam turbine lubricating oil, etc., and its composition is quite complicated. It contains a small amount of gasoline, diesel oil, moisture, colloid, asphaltene, carbon residue, metal debris, solid particles, oxygen, sulfur, nitrogen, calcium, silicon, copper, molybdenum, lead, antimony, chlorine, phosphorus, Various lubricating oil additives of boron and other elements are a kind of waste oil that is extremely difficult to deal with. [0003] At present, the technical routes adopted for the recovery and treatment of waste lubricating oil are: 1. Sulfuric aci...

AI Technical Summary

Problems solved by technology

This is because in the fixed-bed hydrofinishing waste lubricating oil process, the pretreated waste lubricating oil and hydrogen enter the reactor from the upper part of the reactor, and the waste lubricating oil and hydrogen pass through the fixed bed from top to bottom. The catalyst bed layer, the various metal ion additives contained in the waste lubricating oil are hydrogenated and decomposed under the hydrogenation process conditions, and the separated various metal ions are naturally deposited in the catalyst bed layer, blocking the gaps between the catalyst particles, Catalyst particles are bonded together in a short period of time to form a hardened layer, which causes a short-term increase in the pressure drop of the fixed-bed hydrogenation reactor, resulting in the unit having to be shut down for catalyst skimming treatment. The unit starts and shuts down frequently, which is difficult to bring economic benefits to the owner benefit

Several sets of domestic industrial units that adopt conventional distillation-fixed-bed hydrofining-conventional fractionation process technology to hydrotreat waste lubricating oil have been shut down for a long time due to the inability to solve the above technical problems

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