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Method for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons to produce more dimethylbenzene

A technology for polycyclic aromatic hydrocarbons and monocyclic aromatic hydrocarbons, which is applied in the field of converting polycyclic aromatic hydrocarbons that produce more xylene into monocyclic aromatic hydrocarbons, can solve the problems of low conversion depth of polycyclic aromatic hydrocarbons, fast catalyst deactivation rate, low xylene yield, etc. problems, to achieve the effect of delaying the inactivation rate, improving the service life, and delaying the growth of aggregation

Active Publication Date: 2015-07-08
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 to overcome the low conversion depth of polycyclic aromatic hydrocarbons, low xylene yield and low selectivity, and fast catalyst deactivation rate when heavy polycyclic aromatic hydrocarbons are converted into single-ring aromatic hydrocarbons in the prior art. To provide a new method for the conversion of polycyclic aromatic hydrocarbons that produce more xylenes into monocyclic aromatic hydrocarbons

Method used

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  • Method for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons to produce more dimethylbenzene
  • Method for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons to produce more dimethylbenzene
  • Method for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons to produce more dimethylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 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.

[0029] 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

[0031] 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.

[0032] Table 1

[0033]

Embodiment 7～10

[0035] 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.

[0036] Table 2

[0037]

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Abstract

The invention relates to a method for converting polycyclic aromatic hydrocarbons into monocyclic aromatic hydrocarbons to produce more dimethylbenzene, 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 technical scheme that polycyclic aromatic hydrocarbon mixtures and hydrogen are taken as the raw materials and are contacted with a catalyst in a fixed bend reactor to react under the conditions that the reaction temperature is 330-420 DEG C, the reaction pressure is 4-7MPa, the weight hourly space velocity is 1-3hr<-1> and the hydrogen-hydrocarbon mole ratio is 5.0-8.0 to generate monocyclic aromatic hydrocarbon mixtures producing more dimethylbenzene. The method 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 method for converting polycyclic aromatic hydrocarbons producing multiple xylenes into single-cyclic aromatic hydrocarbons. 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 is an important development dire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/02C07C15/08C07C4/06B01J29/80B01J29/12
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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