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Method for producing low sulfur gasoline by using by inferior gasoline fractions

A low-quality gasoline and gasoline technology, applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problem of affecting the activity and stability of hydrodesulfurization catalysts, increase the depth of hydrodesulfurization of heavy fractions, and accelerate the shrinkage of diolefins Synthetic coke and other problems, to achieve the effect of reducing the risk of condensation into coke, inhibiting carbon deposition, and prolonging the operation cycle

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantage is that it does not need fractional distillation to process full fraction FCC gasoline. The disadvantage is that most of the residual sulfur compounds in the final product are mercaptan sulfur compounds, which leads to unqualified mercaptan sulfur in the product
This method does not undergo pretreatment before FCC gasoline fractionation, and there will be the following problems: because FCC gasoline will contain a small amount of dienes, and dienes will not only polymerize themselves, but also react with other hydrocarbons in FCC gasoline at a certain temperature. Reaction occurs to form colloids or coking precursors. At the same time, the distilled light gasoline also contains more mercaptan sulfur (mercaptan sulfur content> 10μg / g). In order to make the blended gasoline meet the standard, it is necessary to increase the concentration of heavy fractions Hydrodesulfurization Depth
The disadvantage of this method is that in the early stage of alkali-free deodorization, the oil is fully contacted with oxygen, and the oxygen in the oil accelerates the polymerization of diolefins to form coke and the further condensation of colloids into coke, which affects the activity and quality of subsequent hydrodesulfurization catalysts. stability

Method used

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  • Method for producing low sulfur gasoline by using by inferior gasoline fractions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Use 1000 grams of aluminum hydroxide powder, add 20 milliliters of nitric acid, 700 milliliters of deionized water and an extrusion aid to mix and roll, extrude into a clover shape, dry at 110°C for 3 hours, and roast at 550°C for 3 hours to obtain an alumina carrier.

[0041] Mix 30 grams of copper nitrate, 18 grams of zinc nitrate, 7 grams of ammonium dihydrogen phosphate and 60 milliliters of deionized water, dissolve at 60 ° C for 1 hour to obtain 65 milliliters of Cu-Zn-P co-immersion solution, and 100 grams of oxidized The aluminum carrier was impregnated with the above impregnating solution at room temperature, dried at 120°C for 8 hours, and calcined at 500°C for 8 hours to obtain the pretreatment catalyst FHT1. The physical properties of the FHT1 catalyst are listed in Table 1.

Embodiment 2

[0043] Use 900g of aluminum hydroxide powder, add 18ml of nitric acid, 600ml of deionized water, 450g of silica sol and extrusion aid, mix and roll, extrude into a clover shape, dry at 110°C for 3 hours, and roast at 550°C for 3 hours to obtain the carrier .

[0044] Mix 60 grams of copper nitrate, 45 grams of zinc nitrate, 4.3 grams of diammonium hydrogen phosphate and 60 milliliters of deionized water, dissolve at 60 ° C for 1 hour to obtain 65 milliliters of Cu-Zn-P co-immersion solution, and 100 grams of roasted carrier T-2 was impregnated with the above impregnation solution at room temperature, dried at 120°C for 8 hours, and calcined at 500°C for 8 hours to obtain the pretreatment catalyst FHT2. The physical properties of the FHT2 catalyst are listed in Table 1.

Embodiment 3

[0050] This example shows the desulfurization effect of inferior FCC gasoline.

[0051] (1) Raw oil pretreatment

[0052] The evaluation test was carried out on a fixed-bed reactor device, and 30 ml of the FHT1 catalyst prepared in Example 1 was loaded into the reactor. Pass hydrogen first (hydrogen volume space velocity 3.0h -1 ), the hydrogen pressure is 1.0MPa, and it is raised from room temperature to 260°C within 6 hours, and then reduced at constant temperature for 8 hours.

[0053] After reduction, the temperature is lowered to 220°C, and the FCC gasoline raw material is fed, the hydrogen partial pressure is 1.6MPa, the hydrogen-oil volume ratio is 400:1, and the volume space velocity is 3.0h -1 . After the oil inlet is stable, sample and analyze. Table 3 lists the main properties of the raw material and the product after pretreatment for 5000 hours.

[0054] (2) Cutting of raw oil light distillate and heavy distillate

[0055] The pretreated FCC gasoline is separ...

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Abstract

The invention discloses a method for producing low sulfur gasoline by using by inferior gasoline fractions. The method comprises the following steps of: pretreating a full-range inferior gasoline material to remove diene and thiol; performing fractionation to obtain light fractions and heavy fractions; performing selective hydrodesulfurization on the heavy fractions by using a selective hydrodesulfurization catalyst; and mixing a desulfurization product and the light fractions to obtain a clean gasoline product. In a pretreatment catalyst adopted, alumina or silicon-containing alumina is taken as a carrier, copper and zinc are taken as active ingredients, and phosphorus is taken as an aid. Compared with the prior art, the method has the advantages that: deep desulfurization can be achieved, the loss of octane number is small, the catalysts have high activity and stability, and the running period of a device is long.

Description

technical field [0001] The invention relates to a method for deep desulfurization of inferior gasoline fractions to produce clean gasoline, in particular to a method for demercaptanization, diene removal and hydrodesulfurization of inferior gasoline fractions. Background technique [0002] With the increasingly stringent environmental protection regulations, countries around the world have put forward more and more stringent requirements for gasoline products, especially for the sulfur content in gasoline. / g to ≯150μg / g, and will develop into ≯50μg / g, even ≯10μg / g "sulfur-free gasoline". Where ≯ means "not greater than" or "less than or equal to". [0003] At present, catalytic cracking (FCC) is an important source of gasoline. For example, the proportion of FCC gasoline in refined gasoline in Chinese refineries is more than 80%, while the sulfur content in FCC gasoline is generally 200-1000μg / g, and the mercaptan content is generally 20~100μg / g. Therefore, FCC gasoline ...

Claims

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Application Information

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IPC IPC(8): C10G67/00
Inventor 尤百玲赵乐平方向晨庞宏
Owner CHINA PETROLEUM & CHEM CORP
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