Method for producing high-grade lubricant base oil through hydrogenating of hydrocracking tail oil

Abstract

The invention discloses a method for producing high-grade lubricant base oil through hydrogenating of hydrocracking tail oil. The method comprises the steps of: by taking the hydrocracking tail oil as a raw material, firstly carrying out decompression pre-fractionation to obtain NO.4 base oil stock with final boiling point of less than or equal to 430 DEG C and NO.6 base oil stock with initial boiling point of more than 430 DEG C; leading in the NO.4 base oil stock and NO.6 base oil stock into an isodewaxing reactor and a supplementary refining reactor together with hydrogen by adopting a feeding switching mode or respective feeding mode, so as to carry out hydrogenation isodewaxing reaction and supplementary refining reaction, wherein the isodewaxing reactor and the supplementary refining reactor are connected in series; after reaction is finished, separating out gas from liquor to obtain a liquor phase, and fractionating the liquor phase to obtain the high-grade lubricant base oil. By adopting a method of switching or independently feeding plus mixed feeding, the selectivity of raw materials and the flexibility of production can be improved. The base oil produced can achieve the requirement of API II type and III type lubricant base oil, and the yield of the obtained API III base oil is high.

Description

technical field

[0001] The invention belongs to the field of petrochemical industry, and in particular relates to a method and equipment for producing high-grade lubricating oil base oil through hydrogenation of hydrocracking tail oil. Background technique

[0002] The content of lubricating oil base oil in finished lubricating oil is usually 70% to 99%. The quality of base oil directly affects the quality of lubricating oil. The most important thing in China's lubricating oil market is internal combustion engine oil, which is divided into high, medium and low grades in terms of quality, and their market shares are 10%, 30% and 60% respectively. The current production situation of lubricating oil in my country is that the output of low-grade products is too large, the proportion of medium and high-end products is relatively small, and the gap of high-end products is relatively large. Moreover, there is a big gap between the quality and the international level. The main reas...

Examples

Embodiment 1

[0038] First, the hydrocracking tail oil (see Table 2 for properties) enters the vacuum pre-fractionator for vacuum fractionation. The cut point of vacuum fractionation is 430°C, and the light fraction of hydrocracking tail oil with an end boiling point ≤ 430°C is taken as No. 4 As the base oil, the heavy fraction of hydrocracking tail oil with an initial boiling point > 430°C was used as the No. 6 base oil (see Table 2 for properties). The base oil is mixed with new hydrogen and the circulating hydrogen boosted by the circulating hydrogen compressor, and then enters the isomerization dewaxing and supplementary refining reactor in turn (see Table 3 for the catalyst used); the reaction is separated from the gas and liquid, and the gas is desulfurized and then compressed The machine pressurization is mixed with fresh hydrogen as the raw material of the isomerization dewaxing-supplementary refining reactor, and the liquid product is often distilled under reduced pressure to obtain...

Embodiment 2

[0040] The raw material that adopts, technological process and corresponding catalyzer are identical with embodiment 1, and what differ with embodiment 1 is the technological condition selected, and reaction technological condition is shown in Table 4, and the result and the property of the lubricating base oil product of generation are shown in Table 5 and Table 7. Comparative example 1

technical field

[0001] The invention belongs to the field of petrochemical industry, and in particular relates to a method and equipment for producing high-grade lubricating oil base oil through hydrogenation of hydrocracking tail oil. Background technique

[0002] The content of lubricating oil base oil in finished lubricating oil is usually 70% to 99%. The quality of base oil directly affects the quality of lubricating oil. The most important thing in China's lubricating oil market is internal combustion engine oil, which is divided into high, medium and low grades in terms of quality, and their market shares are 10%, 30% and 60% respectively. The current production situation of lubricating oil in my country is that the output of low-grade products is too large, the proportion of medium and high-end products is relatively small, and the gap of high-end products is relatively large. Moreover, there is a big gap between the quality and the international level. The main reas...

Examples

Embodiment 1

[0038] First, the hydrocracking tail oil (see Table 2 for properties) enters the vacuum pre-fractionator for vacuum fractionation. The cut point of vacuum fractionation is 430°C, and the light fraction of hydrocracking tail oil with an end boiling point ≤ 430°C is taken as No. 4 As the base oil, the heavy fraction of hydrocracking tail oil with an initial boiling point > 430°C was used as the No. 6 base oil (see Table 2 for properties). The base oil is mixed with new hydrogen and the circulating hydrogen boosted by the circulating hydrogen compressor, and then enters the isomerization dewaxing and supplementary refining reactor in turn (see Table 3 for the catalyst used); the reaction is separated from the gas and liquid, and the gas is desulfurized and then compressed The machine pressurization is mixed with fresh hydrogen as the raw material of the isomerization dewaxing-supplementary refining reactor, and the liquid product is often distilled under reduced pressure to obtain...

Embodiment 2

[0040] The raw material that adopts, technological process and corresponding catalyzer are identical with embodiment 1, and what differ with embodiment 1 is the technological condition selected, and reaction technological condition is shown in Table 4, and the result and the property of the lubricating base oil product of generation are shown in Table 5 and Table 7. Comparative example 1

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