Method for converting C9+ heavy arenes into light arenes

A technology for heavy aromatics and light aromatics, applied in chemical instruments and methods, organic chemistry, hydrocarbon oil cracking, etc., to achieve the effects of reduced total hydrogen consumption, extended operating cycle, and reduced loss of aromatic rings

Active Publication Date: 2011-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is not advisable to directly use heavy aromatic

Method used

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  • Method for converting C9+ heavy arenes into light arenes
  • Method for converting C9+ heavy arenes into light arenes

Examples

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preparation example Construction

[0017] The preparation method of the iridium-containing catalyst is as follows: first impregnating the molded carrier with an impregnating solution prepared with an Ir-containing compound, and then drying, high-temperature water chlorine activation treatment and reduction to obtain the catalyst. The iridium-containing compound used to prepare the immersion solution is preferably chloroiridic acid, ammonium chloroiridate, iridium chloride or iridium oxide. In order to distribute the iridium evenly in the carrier, it is preferable to add a halide, preferably hydrochloric acid, to the impregnating solution, so that the Cl therein - Competitive adsorption with iridium ions. The liquid / solid volume ratio during immersion is preferably 1.0-3.0:1, and the immersion temperature is preferably 20-40°C. Filter after impregnation, dry the solid at 100-200°C, and then conduct water chlorine activation treatment.

[0018] The water chlorine activation treatment is a process in which the d...

example 1

[0030] Preparation of iridium-containing catalysts.

[0031] Get 128 grams of aluminum hydroxide powder (SB powder, produced by Changling Catalyst Factory), add 38.4 grams of concentration and knead it with 5% by mass nitric acid and 25.6 milliliters of deionized water, extrude, and pelletize the strips at 120° C. Dry for 8 hours, and bake at 550° C. for 6 hours to obtain 100 g of γ-alumina carrier.

[0032] Get 100 grams of gamma-alumina carriers, use the mixed solution of chloroiridic acid and hydrochloric acid as the impregnating solution and soak for 24 hours at 25° C., containing 0.45 mass % of Ir and 2.5 mass % of HCl in the impregnating solution (both based on dry base alumina carrier base calculation), add deionized water to make the liquid / solid volume ratio 1.5. After impregnation, filter, and dry the obtained solid at 120°C for 12 hours, 550°C, H 2 Under the condition that the O / HCl molar ratio is 20, water chlorine is activated for 6 hours, 350°C, H 2 Under the ...

example 2

[0034] The catalyst was prepared according to the method of Example 1, except that the prepared impregnating solution contained 0.30% by mass of Ir, and the obtained catalyst B had an Ir content of 0.30% by mass and a chlorine content of 1.3% by mass.

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Abstract

The invention discloses a method for converting C9+ heavy arenes into light arenes, which comprises: reacting the C9+ heavy arenes by contacting the C9+ heavy arenes with an iridium-containing catalyst at 450 to 500 DEG C in the presence of hydrogen, and reacting the product of the primary reaction by contacting the product with a zeolite-containing catalyst at 380 to 420 DEG C in the presence of hydrogen, wherein the iridium-containing catalyst comprises a high-temperature resistant organic oxide carrier as well as iridium in an amount which is 0.01 to 2.0 mass percent based on the mass of the carrier and halogen in an amount which is 0.01 to 3.0 mass percent based on the mass of the carrier; and the zeolite-containing catalyst comprises a zeolite-containing carrier and a metal of the platinum group in an amount which is 0.01 to 2.0 mass percent based on the mass of the carrier. When the method is used, the total hydrogen consumption of the reaction system is reduced, the selectivity of dimethylbenzene is improved, the aromatic ring loss is reduced, the carbon accumulation rate of the zeolite catalyst is reduced greatly and the operation cycle of the reaction system is prolonged.

Description

technical field [0001] The invention is a method for lightening heavy aromatic hydrocarbons, specifically, a method for converting C 9 + A method for producing benzene, toluene and xylene by lightening heavy aromatics. Background technique [0002] Heavy aromatics generally refer to catalytic reforming, disproportionation and isomerization reactions to generate oil and C contained in ethylene cracking hydrogenated gasoline 9 ~C 16 mono- and bicycloalkylaromatics. For a long time, heavy aromatic resources have not been rationally and fully utilized, except for a small amount used as solvent and extraction of C 9 、C 10 Except for monomeric aromatics, they are generally directly blended into gasoline pools as fuel. However, it is not advisable to directly use heavy aromatics as fuels from both economic and environmental point of view. On the one hand, heavy aromatics can be converted into light aromatics such as benzene, toluene, and xylene (BTX); pollution, and conside...

Claims

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Application Information

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IPC IPC(8): C10G47/18C10G47/14C07C4/18C07C15/04C07C15/06C07C15/08
CPCY02P20/52
Inventor 蔡迎春马爱增潘锦程
Owner CHINA PETROLEUM & CHEM CORP
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