Renewable catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons and preparation method thereof

A technology for polycyclic aromatic hydrocarbons and monocyclic aromatic hydrocarbons, which is applied in the field of catalysts and their preparation, can solve the problems of low conversion depth of polycyclic aromatic hydrocarbons, poor catalyst regeneration performance, low yield of monocyclic aromatic hydrocarbons, etc., and achieves maximum yield and selectivity. chemical, good stability, and the effect of delaying the inactivation rate

Active Publication Date: 2017-09-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the technical problems to be solved by the present invention is to provide a new method for overcoming the problems of low conversion depth of polycyclic aromatic hydrocarbons, low yield and selectivity of single-ring aromatic hydrocarbons, and poor catalyst regeneration performance in the prior art. Catalysts for the Conversion of Polycyclic Aromatic Hydrocarbons to Monocyclic Aromatic Hydrocarbons

Method used

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  • Renewable catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons and preparation method thereof
  • Renewable catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] On a dry basis, 25 g MOR type zeolite (commercially available ammonium type), 25 g ZSM-12 molecular sieve (commercially available hydrogen type) and 50 g γ-Al 2 o 3 (Industrial product) Add to the mixer until uniform, then add 3 g of scallop powder, 5 g of HNO at a volume ratio of 1:1 to the mixture 3solution and 40 g deionized water, and grind evenly to make a dough suitable for extrusion. It was extruded through a die in the shape of a slender cylinder (diameter 1.7 mm), dried at 120 °C and calcined at 550 °C for 4 h, and then cut into carrier particles (1.7 × 4.0 mm) with the same size. for Z1.

[0034] Prepare a solution of chloroplatinic acid and impregnate the carrier particles at 40°C. The amount of Pt contained in the impregnating solution is 0.2% of the weight of the carrier on a dry basis. After 8 hours of immersion and drying, it is calcined at 450°C for 3 hours to obtain a finished product. Catalyst A.

Embodiment 2～10

[0036] According to the preparation method and process provided in Example 1, a series of finished catalysts were prepared by changing the carrier composition and the type and content of metal precursors in the impregnation solution, as shown in Table 1.

[0037] Table 1

[0038]

Embodiment 11～19

[0040] Catalysts A~J prepared by Examples 1~10 are investigated on a supercritical fixed-bed reactor (maximum reaction pressure 10MPa, operating temperature is room temperature~600°C) and the polycyclic aromatic hydrocarbon mixture is converted into BTX (wherein B is benzene, T is toluene, X is the ability of monocyclic aromatic hydrocarbons such as xylene). Table 2 is the evaluation raw material composition. The catalyst is loaded with 5 g, at a reaction temperature of 350 ° C, a reaction pressure of 5.5 MPa, and a weight hourly space velocity of 2.0 hr -1 , Hydrogen / hydrocarbon molar ratio of 6.0 and contact with the catalyst, the product is recovered and component detection, the conversion results are shown in Table 3.

[0041] Table 2

[0042] Raw material composition

Non-Fang

benzene

toluene

Ethylbenzene

Xylene

Decalin

tetralin

naphthalene

Content (wt%)

0.02

24.54

24.61

5.00

0.02

14.81

15.25

15.75 ...

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Abstract

The invention relates to a reproducible catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons and a preparation method thereof. The method mainly solves the problems of low conversion depth of polycyclic aromatic hydrocarbons, low yield and selectivity of single-ring aromatic hydrocarbons, and poor catalyst regeneration performance existing in the prior art. The present invention comprises a mixture of 30-65% MOR-type zeolite and ZSM-12 molecular sieve in terms of weight percentage by using a catalyst, and 34.5-69.9% is selected from at least one of γ-alumina, η-alumina or pseudo-boehmite A kind of technical scheme that is binding agent and 0.1~0.5% at least one kind of metal selected from Pt, Pd or Ir solves the above-mentioned problems well, and the regeneration performance of the catalyst is better, and the catalyst can be used for heavy polycyclic In the industrial production of aromatics converted into single-ring aromatics.

Description

technical field [0001] The invention relates to a reproducible catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons and a preparation method thereof. Background technique [0002] Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons PAHs) are hydrocarbons containing two or more benzene rings in their molecules, including more than 150 compounds such as naphthalene, anthracene, phenanthrene, and pyrene, and are important environmental and food pollutants. In the process of petroleum refining, how to develop high value-added products by using heavy aromatic raw materials containing a large amount of polycyclic aromatic hydrocarbons has become an important issue faced by petrochemical workers. With the deepening of the heavy quality of oil products, except for a small part as solvent oil, more heavy aromatics raw materials are used as fuel oil. However, with the improvement of environmental protection requirements, the hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80B01J29/90C07C4/26C07C15/02
CPCY02P20/52Y02P20/584
Inventor 李旭光郑均林孔德金姜向东
Owner CHINA PETROLEUM & CHEM CORP
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