Hydrofining process of waste lubricating oil

Abstract

The invention provides a hydrofining process of waste lubricating oil. The process comprises: after pre-treating, dewatering and removing impurities from a raw material, removing pitch and colloid in a propane extraction or wiped film vaporization device, and perfecting the product quality via a two-stage hydrofining reactor, and filling a hydrogenation protective agent and a demetallization agent in a pre-hydrogenation reaction, wherein the reaction temperature is 310-360 DEG C, the pressure is 6-12 MPa, the volume ratio of hydrogen to oil is 100-300, and the liquid volume space velocity is 0.5-1.2h<-1>, the reaction temperature of a main hydrogenation reactor is 320-400 DEG C, the pressure is 6-12 MPa, the volume ratio of hydrogen to oil is 500-1000, the liquid volume space velocity is 0.2-0.6h<-1>, and the used catalyst is Ni-Mo-W-Ce / Al2O3 or Ni-Mo-P-La / Al2O3; no acid or alkali waste is discharged in the production process, thereby being environmentally friendly and pollution-free, the recovery rate of the waste oil is higher than 95%, and the oil quality can be greatly improved to increase the economic benefits.

Description

technical field

[0001] The invention relates to a waste lubricating oil hydrogenation refining process. Specifically, it relates to a hydrogenation technology to remove impurities in waste lubricating oil, so as to obtain clean gasoline and diesel blending combination and lubricating oil base oil. Background technique

[0002] In terms of composition, lubricating oil is composed of 80%-90% base oil and 10%-20% additives. The main chemical composition is a mixture of various hydrocarbons and a small amount of non-hydrocarbons. However, after the lubricating oil has been used for a period of time, the performance of the lubricating oil has deteriorated due to physical, chemical or human factors, such as aldehydes, ketones, resins, asphalt colloidal substances, carbon black and organic acids, salt, water, metal shavings, etc. Contaminated impurities can no longer be used and become waste lubricating oil. In fact, waste lubricating oil is not waste, but only a few percent of t...

Examples

Embodiment 1

[0027] The raw material waste lubricating oil 1 (see Table 1 for its properties) is first filtered through the dehydration and impurity removal unit 2 to filter out large particles of impurities larger than 25 μm, and remove the moisture in the raw material, and then enter the weight removal and fractionation device 3 to remove Removal of colloid and asphalt, deweighting adopts the method of propane extraction; then heat exchange with the material flowing out of the dechlorination reactor 8 through the heat exchanger 4, and then heated to 310°C by the heater 5 and enters the prehydrogenation reactor 6 , at a pressure of 6.0MPa, a volume ratio of hydrogen to oil of 300, and a volumetric space velocity of 1h -1Under certain conditions, various metal impurities are removed and some olefins are saturated. The upper part of the prehydrogenation reactor is filled with 1 / 3 volume of hydrogenation protection agent. The hydrogenation protection agent uses spherical Al-Ti-HY with large p...

Embodiment 2

[0029] Raw material waste lubricating oil 1 (see Table 1 for its properties) is first filtered and removed by dehydration and impurity removal device 2 to filter out large particles of impurities larger than 25 μm and remove moisture in the raw material, and then enter the weight removal and fractionation device 3 to remove In addition to colloid and asphalt, deweighting adopts the method of propane extraction; after heat exchange with the material flowing out of the dechlorination reactor 8 through the heat exchanger 4, it is heated to 330 ° C by the heater 5 and enters the prehydrogenation reactor 6 , at a pressure of 8.0MPa, a volume ratio of hydrogen to oil of 200, and a volumetric space velocity of 2h -1 Under certain conditions, various metal impurities are removed and some olefins are saturated. The upper part of the prehydrogenation reactor is filled with 1 / 3 volume of hydrogenation protection agent. The hydrogenation protection agent uses spherical Al-Ti-HY with large ...

Embodiment 3

[0031] Raw material waste lubricating oil 1 (see Table 1 for its properties) is first filtered and removed by dehydration and impurity removal device 2 to filter out large particles of impurities larger than 25 μm and remove moisture in the raw material, and then enter the weight removal and fractionation device 3 to remove Colloid and asphalt are removed, and weight removal adopts the method of wiped film evaporation; after heat exchange with the material flowing out of the dechlorination reactor 8 through the heat exchanger 4, it is heated to 360°C by the heater 5 and then enters the prehydrogenation reactor 6 , at a pressure of 12.0MPa, a volume ratio of hydrogen to oil of 100, and a volumetric space velocity of 3h -1 , to remove various metal impurities and saturate some olefins, the upper part of the prehydrogenation reactor is filled with 1 / 3 volume of hydrogenation protection agent, the hydrogenation protection agent uses spherical Al-Ti-HY with large pores as the carrie...

technical field

[0001] The invention relates to a waste lubricating oil hydrogenation refining process. Specifically, it relates to a hydrogenation technology to remove impurities in waste lubricating oil, so as to obtain clean gasoline and diesel blending combination and lubricating oil base oil. Background technique

[0002] In terms of composition, lubricating oil is composed of 80%-90% base oil and 10%-20% additives. The main chemical composition is a mixture of various hydrocarbons and a small amount of non-hydrocarbons. However, after the lubricating oil has been used for a period of time, the performance of the lubricating oil has deteriorated due to physical, chemical or human factors, such as aldehydes, ketones, resins, asphalt colloidal substances, carbon black and organic acids, salt, water, metal shavings, etc. Contaminated impurities can no longer be used and become waste lubricating oil. In fact, waste lubricating oil is not waste, but only a few percent of t...

Examples

Embodiment 1

[0027] The raw material waste lubricating oil 1 (see Table 1 for its properties) is first filtered through the dehydration and impurity removal unit 2 to filter out large particles of impurities larger than 25 μm, and remove the moisture in the raw material, and then enter the weight removal and fractionation device 3 to remove Removal of colloid and asphalt, deweighting adopts the method of propane extraction; then heat exchange with the material flowing out of the dechlorination reactor 8 through the heat exchanger 4, and then heated to 310°C by the heater 5 and enters the prehydrogenation reactor 6 , at a pressure of 6.0MPa, a volume ratio of hydrogen to oil of 300, and a volumetric space velocity of 1h -1Under certain conditions, various metal impurities are removed and some olefins are saturated. The upper part of the prehydrogenation reactor is filled with 1 / 3 volume of hydrogenation protection agent. The hydrogenation protection agent uses spherical Al-Ti-HY with large p...

Embodiment 2

[0029] Raw material waste lubricating oil 1 (see Table 1 for its properties) is first filtered and removed by dehydration and impurity removal device 2 to filter out large particles of impurities larger than 25 μm and remove moisture in the raw material, and then enter the weight removal and fractionation device 3 to remove In addition to colloid and asphalt, deweighting adopts the method of propane extraction; after heat exchange with the material flowing out of the dechlorination reactor 8 through the heat exchanger 4, it is heated to 330 ° C by the heater 5 and enters the prehydrogenation reactor 6 , at a pressure of 8.0MPa, a volume ratio of hydrogen to oil of 200, and a volumetric space velocity of 2h -1 Under certain conditions, various metal impurities are removed and some olefins are saturated. The upper part of the prehydrogenation reactor is filled with 1 / 3 volume of hydrogenation protection agent. The hydrogenation protection agent uses spherical Al-Ti-HY with large ...

Embodiment 3

[0031] Raw material waste lubricating oil 1 (see Table 1 for its properties) is first filtered and removed by dehydration and impurity removal device 2 to filter out large particles of impurities larger than 25 μm and remove moisture in the raw material, and then enter the weight removal and fractionation device 3 to remove Colloid and asphalt are removed, and weight removal adopts the method of wiped film evaporation; after heat exchange with the material flowing out of the dechlorination reactor 8 through the heat exchanger 4, it is heated to 360°C by the heater 5 and then enters the prehydrogenation reactor 6 , at a pressure of 12.0MPa, a volume ratio of hydrogen to oil of 100, and a volumetric space velocity of 3h -1 , to remove various metal impurities and saturate some olefins, the upper part of the prehydrogenation reactor is filled with 1 / 3 volume of hydrogenation protection agent, the hydrogenation protection agent uses spherical Al-Ti-HY with large pores as the carrie...

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