Method for conversion of C10+ heavy aromatics into light aromatics by virtue of hydrogenation

A technology for lightening and heavy aromatic hydrocarbons by hydrogenation, which is applied in the directions of hydrotreating process, treatment of hydrocarbon oil, petroleum industry, etc., can solve the problems of low content of heavy aromatic hydrocarbons, poor stability of catalyst activity, etc. The product is flexible and the effect of reducing the speed of carbon deposition and coking

Active Publication Date: 2015-02-18
CHINA NAT OFFSHORE OIL CORP +2
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a C 10 + The hydrogenation and lightening method of heavy aromatics increases the production of light aromatics or high-octane gasoline blending components through the hydroge

Method used

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  • Method for conversion of C10+ heavy aromatics into light aromatics by virtue of hydrogenation
  • Method for conversion of C10+ heavy aromatics into light aromatics by virtue of hydrogenation

Examples

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preparation example Construction

[0029] Preparation of prehydrogenation catalyst: Take 400g of macroporous pseudo-boehmite, add 360mL of 3% dilute nitric acid solution, 12g of scallop powder, knead, shape, dry at 120°C for 8h, and roast at 550°C for 4h to obtain γ-Al 2 o 3 Carrier 320g; Dissolve 72g of nickel acetate and 20g of citric acid in deionized water to prepare 360mL of impregnation solution; load the impregnation solution on the carrier by saturated impregnation method, then dry at 120°C for 8h, and roast at 600°C for 3h to obtain pre-added 356g of hydrogen catalyst; wherein the content of active metal Ni in the catalyst is 10wt%.

[0030] Preparation of hydrocracking catalyst: Take 280g of modified Y molecular sieve, add 40g of binder kaolin, 16g of scallop powder, 400mL of 3% dilute nitric acid solution, knead, shape, dry at 120°C for 8h, and roast at 600°C for 4h Prepare the molecular sieve carrier; take 3 g of metal Pt nitrate and add deionized water to make an impregnating solution 290 mL, plac...

Embodiment 1

[0033] Take the by-product C from a refinery reforming unit 10 + The heavy aromatic fraction is used as raw material, and the properties of the raw material are shown in Table 1. After the raw material is mixed with hydrogen, it passes through the pre-hydrogenation reactor and the hydrocracking reactor in sequence, and the feed volume space velocity is 1.0h -1 , the hydrogen hydrocarbon volume ratio is 1000:1, the reaction temperatures in the middle of the two reactor beds are 350°C and 360°C respectively, and the reaction pressure is 2.5MPa. After the product is separated by the No. 1 rectification tower, the bottom material enters the No. Distillation tower, the fraction before 205°C was extracted from the top of the tower, and the material at the bottom of the tower was recycled to the reaction system. The product analysis data are shown in Table 2.

Embodiment 2

[0035] Experiment with the same raw materials as in Example 1. After the raw material is mixed with hydrogen, it passes through the pre-hydrogenation reactor and the hydrocracking reactor in sequence, and the feed volume space velocity is 1.0h -1 , the hydrogen hydrocarbon volume ratio is 1000:1, the reaction temperatures in the middle of the two reactor beds are 340°C and 355°C, and the reaction pressure is 3.0MPa. After the product is separated by the No. 1 rectification tower, the bottom material enters the No. 2 rectifier Distillation tower, the fraction before 205°C was extracted from the top of the tower, and the material at the bottom of the tower was recycled to the reaction system. The product analysis data are shown in Table 2.

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Abstract

The invention relates to a method for conversion of C10+ heavy aromatics into light aromatics by virtue of hydrogenation. The method is characterized by comprising the following steps: preheating heavy aromatics raw material through a heating furnace, performing oil-gas mixing on the preheated heavy aromatics raw material and hydrogen, respectively performing pre-hydrogenation saturation and hydrocracking reaction through two reactors in series connection in order; isolating benzene, toluene and light alkane mixture from reaction product through one-step rectification, isolating C8-C9 aromatics crude product or light fraction before 205 DEG.C for high-octane petrol blending component from tower bottom material through rectification, and circularly reacting tower bottom heavy fraction. The method can be used for processing byproduct C10+ heavy aromatics of a reformer or a steam cracking device in a refinery plant, and increasing the production of light aromatics or high-octane petrol blending component. The method provided by the method has the features of high heavy aromatics conversion activity, good catalyst stability and flexible product on the process.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, in particular to a C 10 + A method for hydrogenation and lightening of heavy aromatics. Background technique [0002] A large amount of C 9 、C 10 and above heavy aromatics. Currently, except C 9 Aromatics (a small amount of C 10 Aromatics) can be used for transalkylation reaction to prepare mixed xylenes, C 10 The components with higher economic value in heavy aromatics and above account for only about 8%. Generally, through a simple rectification operation, high-value durene, naphthalene, methylnaphthalene, etc. are separated, and the remaining small part is used to produce solvent oil or as a blending component of gasoline, and most of them are used as low-priced fuel. 20% to 30% C 10 Heavy aromatics are converted to heavy residues. According to existing C 10 + The production and operation mode of heavy aromatics has a low utilization rate of raw materials, which not only waste...

Claims

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Application Information

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IPC IPC(8): C10G67/02
CPCC10G67/02C10G2300/1096
Inventor 臧甲忠张国辉于海斌范景新宫毓鹏成宏张雪梅郭春垒刘航李健
Owner CHINA NAT OFFSHORE OIL CORP
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