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Light cycle oil selective hydrorefining method

A light cycle oil, hydrorefining technology, applied in the petroleum industry, processing hydrocarbon oil, etc., can solve the problems of large loss of aromatics, low hydrogenation selectivity, etc., and achieve the effect of high denitrification activity and improvement of aromatics retention rate.

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem of low hydrogenation selectivity and large loss of aromatics in the hydrofining process of existing light cycle oil, and provides a highly selective hydrogenation method for light cycle oil refined method

Method used

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  • Light cycle oil selective hydrorefining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of composite carrier: A: Take 95 grams of boehmite and 5.0 grams of gallium-containing layered UFI molecular sieve (see Table 1 for the molar ratio of Si / Ga and Si / [Ga+Al]) and mix evenly. B: Take 20.0 grams of water, add 5.0 grams of aqueous solution containing 30% nitric acid in weight percentage, and 3.5 grams of 10 wt% phosphoric acid, mix and dissolve evenly. Slowly add B to A and stir evenly. After kneading for 40 minutes, dry at 130°C for 3 hours, and bake at 500°C for 2 hours to obtain γ-Al 2 o 3 Composite carrier 1, the composition of the composite carrier is shown in Table 1.

[0019] Catalyst preparation, the impregnation method is used to prepare the catalyst, and the impregnating solution is prepared by weighing 5.5 grams of basic cobalt carbonate, adding 5.6 grams of citric acid, 60.0 grams of water, heating and dissolving, adding 20.0 grams of ethylenediamine, and then adding 20 grams of ammonium molybdate Stir until completely dissolved, we...

Embodiment 2～9

[0022] The preparation method of the composite carrier is exactly the same as that in Example 1, except that the ratio of the raw materials of the carrier and the molar ratio of Si / Ga and Si / [Ga+Al] of the gallium-containing layered UFI molecular sieve are different. The composition of the prepared composite carrier is shown in Table 1. The preparation method of the catalyst is exactly the same as that of Example 1, except that when the active component is NiO or CoO+NiO, the basic cobalt carbonate in the impregnation solution is partially or completely replaced by nickel salt, and the active group loaded on the composite carrier is The specific active components in the catalyst are shown in Table 2. Catalyst activity evaluation conditions are the same as [Example 1], and the evaluation results are shown in Table 3.

[0023] Table 1

[0024]

[0025] *Phosphorus source is ammonium hydrogen phosphate, **ammonium dihydrogen phosphate, phosphoric acid is unmarked, wt% means ...

Embodiment 10～16

[0039] The catalyst of Example 4 is selected, and the results in Table 4 of different sulfur content LCO raw materials and different evaluation conditions are listed in Table 5.

[0040] Table 4

[0041] Sulfur content (ppm) Nitrogen content (ppm) PAH content (wt%) Total aromatics content (wt%) raw material 1 2000 350 45.5 72.6 raw material 2 4000 260 48.3 78.3 raw material 3 6000 530 52.6 80.6 raw material 4 8000 420 56.3 77.2 raw material 5 10000 760 48.7 85.3 raw material 6 15000 620 58.9 80.6

[0042] wt% means percentage by weight.

[0043] table 5

[0044]

[0045] wt% means percentage by weight.

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Abstract

The invention relates to a light cycle oil selective hydrorefining method, and mainly aims at solving the problem that at present arene is largely lost in the hydrorefining process. The problem is well solved by adopting the technical scheme that light cycle oil of which the sulfur content is 2000-15000ppm and hydrogen are used as raw materials; under the condition that the volume ratio of hydrogen to light cycle oil is 300-800 : 1, the temperature is 250-450 DEG C, the weight air speed is 0.5-3 per hour and the pressure is 3-12MPa, the raw materials are contacted with a catalyst; and after the reaction, the removal rate of sulfur in the light cycle oil is larger than 96.0% according to weight percent, the denitrification percent is large than 96.0%, the polycyclic aromatic hydrocarbon conversion rate is larger than 40.0%, and the total remaining rate of arene in a product is larger than 97.0% according to weight percent. The light cycle oil selective hydrorefining method can be applied to industrial production of benzene and dimethylbenzene in a light cycle oil selective hydrogenation mode.

Description

technical field [0001] The invention relates to a method for selective hydrotreating of light cycle oil. Background technique [0002] Catalytic cracked light cycle oil (LCO), usually used as a lower quality blended diesel component, is generally used in blends with straight run diesel. From the perspective of the composition of LCO, the total aromatics content is as high as 50% to 85%, of which naphthalene-based bicyclic aromatics account for about 70%, single-ring aromatics and tricyclic aromatics each account for about 15%, and the others are alkanes, cycloalkanes and alkenes. Wait. The sulfur content of LCO is high (0.2-1.5wt%), the cetane number is only 20-35, and the ignition performance is poor. The annual processing capacity of catalytic cracking (FCC) units in my country has exceeded 68 million tons, and the annual production capacity of LCO has exceeded 10 million tons. In my country, a large amount of LCO is transferred into the general composition of diesel oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G49/08
Inventor 孔德金钱斌郑均林杨德琴
Owner CHINA PETROLEUM & CHEM CORP
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