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Catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons to produce more dimethylbenzene and preparation method thereof

A technology for polycyclic aromatic hydrocarbons and monocyclic aromatic hydrocarbons, applied in the field of catalysts, can solve the problems of low conversion depth of polycyclic aromatic hydrocarbons, fast catalyst deactivation rate, low xylene yield, etc., to delay deactivation rate, improve service life, The effect of delaying aggregation growth

Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is to overcome the low conversion depth of polycyclic aromatic hydrocarbons, low xylene yield and low selectivity when the catalysts in the prior art are used to convert heavy polycyclic aromatic hydrocarbons into single-ring aromatic hydrocarbons. The problem of fast catalyst deactivation rate, providing a new catalyst for the conversion of polycyclic aromatic hydrocarbons that produce more xylenes into single-ring aromatic hydrocarbons

Method used

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  • Catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons to produce more dimethylbenzene and preparation method thereof
  • Catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons to produce more dimethylbenzene and preparation method thereof
  • Catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons to produce more dimethylbenzene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dry basis is 25g FAU type zeolite (commercially available hydrogen type), 25g MFI type zeolite (commercially available hydrogen type) and 50g γ-Al 2 o 3 (Industrial product) Add to the mixer until uniform, then add 3g of scallop powder, 5g of HNO at a volume ratio of 1:1 to the mixture 3 solution and 40g deionized water, and grind evenly to make a dough suitable for extrusion. It is extruded through a die, and the shape is a slender cylinder (diameter 1.7mm). After drying at 120°C, it is baked at 550°C for 4h, and then it is cut into carrier particles (1.7×4.0mm) with the same size, recorded as Z1.

[0030] Prepare a solution of chloroplatinic acid and zinc oxide to impregnate the carrier particles at 40°C. The amounts of Pt and Zn in the impregnating solution are 0.1% and 0.5% of the dry weight of the carrier, respectively. After 8 hours of immersion and drying, the Calcined at 450°C for 3 hours to obtain the finished catalyst A.

Embodiment 2～6

[0032] According to the preparation method and process provided in Example 1, a series of finished catalysts were prepared by changing the types of metal precursors in the impregnation solution during the impregnation of Z1 carrier particles, as shown in Table 1.

[0033] Table 1

[0034]

Embodiment 7～10

[0036] According to the preparation method and process provided in Example 1, a series of finished catalysts were prepared by changing the amount of metal impregnated during the impregnation of Z1 carrier particles, as shown in Table 2.

[0037] Table 2

[0038]

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Abstract

The invention relates to a catalyst for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons to produce more dimethylbenzene and a preparation method thereof, mainly solving the problems in the prior art that the conversion level of polycyclic aromatic hydrocarbons is low, the dimenthylbenzene yield and selectivity are low and the catalyst deactivation rate is high. The problems are better solved by adopting the catalyst and the preparation method thereof. The catalyst comprises 30-60wt% of mixture of FAU type zeolite and at least one molecular sieve from MOR, BEA, MFI and MCM-22, 38-69.9wt% of at least one of gamma-alumina, eta-alumina and pseudo-boehmite as a binder, 0.04-0.9wt% of at least one metal from Pt, Pd and Ir and 0.1-1wt% of at least one of Zn, Sn, La, Ce and Mo. The catalyst can be used in the industrial production of increasing production of dimethylbenzene by converting heavy polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a catalyst for converting polycyclic aromatic hydrocarbons producing multiple xylenes into monocyclic aromatic hydrocarbons and a preparation method thereof. Background technique [0002] Petroleum is an important earth resource on which human beings depend, and is closely related to people's basic necessities of life. However, due to the limited oil resources in the world and the deepening of the heavy oil produced in recent years, people must make reasonable and comprehensive utilization of these heavy oils. In heavy oil products, the annual output of heavy aromatics is increasing year by year. Except for a small part used as organic solvents, most of them are mixed into fuels. No matter from the perspective of environmental protection or economics, the resources of heavy aromatics have not been effectively integrated. use. From the perspective of market demand, production cost and environmental protection requirements, it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80C07C15/08C07C15/04C07C15/06C07C4/12
CPCY02P20/52
Inventor 孔德金李旭光郑均林侯敏陈燕
Owner CHINA PETROLEUM & CHEM CORP
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