Light-hydrocarbon aromatized catalyst and preparation method thereof

A catalyst and aromatization technology, which is applied in the field of light hydrocarbon aromatization catalyst and its preparation, can solve the problems of large carbon deposition, rapid deactivation, and less than 20% of the total utilization rate of the catalyst, and achieves high aromatics yield, single pass The effect of long life and low carbon deposition

Active Publication Date: 2009-12-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0002] The utilization rate of refinery gas in my country is very low. The main reason is to separate olefins as raw materials for alkylation or composite gasoline or to produce additives for petroleum products. The total utilization rate is less than 20%.
However, in the process of aromatization of light hydrocarbons, the catalyst has more carbon deposits and deactivation is faster. Generally, the single-pass reaction cycle is only about 200 hours, and frequent regeneration is required to ensure the progress of the reaction.

Method used

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  • Light-hydrocarbon aromatized catalyst and preparation method thereof
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  • Light-hydrocarbon aromatized catalyst and preparation method thereof

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preparation example Construction

[0019] The preparation method of catalyst provided by the invention comprises the steps:

[0020] (1) impregnating the precursor of alumina with an aqueous solution of a phosphorus-containing compound, drying and roasting to obtain aluminum phosphate;

[0021] (2) mixing hydrogen-type zeolite with an MFI structure and aluminum phosphate, extruding, drying, and roasting to obtain a composite carrier;

[0022] (3) impregnating the above-mentioned composite carrier with a solution containing a zinc compound, then drying and calcining.

[0023] The step (1) of the above method is the preparation of aluminum phosphate, and the precursor of alumina used in it is preferably pseudo-boehmite. The phosphorus-containing compound used to prepare the immersion liquid is preferably phosphoric acid, metaphosphoric acid, ammonium hydrogen phosphate, diammonium hydrogen phosphate or ammonium phosphate. The amount of the phosphorus compound contained in the impregnating liquid should make the...

example 1

[0033] Preparation of the catalyst of the present invention.

[0034] (1) Preparation of aluminum phosphate

[0035] Get 91.2g pseudo-boehmite powder (production of Sasol company, SB, alumina content 75% by mass), add 120g of diammonium hydrogen phosphate aqueous solution containing 11.5% by mass of phosphorus at 25°C, stir for 1 hour, dry at 110°C for 5 hours, and roast at 550°C for 5 hours to obtain 13.8% by mass of phosphorus And aluminum phosphate containing 36.2% by mass of aluminum has an Al / P molar ratio of 3.0.

[0036] (2) Preparation of composite carrier

[0037] Take 52.6g of HZSM-5 zeolite powder (zeolite content of 95% by mass) with a silica / alumina molar ratio of 55 and 50g of the aluminum phosphate prepared in step (1) and mix evenly, add 50g of nitric acid aqueous solution with a concentration of 1.0% by mass for peptization and kneaded evenly, extruded, dried at 110°C for 6 hours, and calcined at 550°C for 5 hours to obtain a composite carrier with a HZSM-...

example 2

[0041] Aluminum phosphate is prepared according to the method of example 1 (1) step, the difference is that 110.4g of pseudoboehmite powder is added to 100 grams of phosphorus-containing 7.4% by mass of diammonium hydrogen phosphate aqueous solution, and after drying and roasting, phosphorus-containing The aluminum phosphate containing 7.4% by mass and 43.9% by mass of aluminum has an Al / P molar ratio of 6.8.

[0042] Get above-mentioned aluminum phosphate, prepare catalyst by the method for example 1 (2), (3) step, the composition and physical property of the catalyst B that make are shown in Table 1.

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Abstract

The invention relates to a light-hydrocarbon aromatized catalyst which comprises the following components according to the mass percent: 20-75 percent of zeolite with MFI structure, 20-75 percent of aluminum phosphate and 0.5-8.0 percent of zinc oxide. The catalyst is used for the light-hydrocarbon aromatization reaction and has better aromatization activity, low carbon deposition rate in the reaction and long one-way service life.

Description

technical field [0001] The invention relates to a light hydrocarbon aromatization catalyst and a preparation method thereof, in particular to a zinc-containing light hydrocarbon aromatization catalyst and a preparation method thereof. Background technique [0002] The utilization rate of refinery gas in my country is very low. The main reason is to separate olefins as raw materials for alkylation or composite gasoline or to produce additives for petroleum products. The total utilization rate is less than 20%. With the improvement of refining and processing capacity, as well as the application of the newly developed catalytic cracking process (MGG) for producing more olefins and liquefied gas, and the application of heavy oil catalytic cracking to produce light olefins (DCC), the yield of light hydrocarbons has increased year by year, but Most of them are used as civil fuels, resulting in a waste of resources; and because of the high olefin content, the combustion quality is ...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J29/70B01J27/18C10G45/68
Inventor 陈春芳于中伟马爱增孙义兰王子健孟宪波
Owner CHINA PETROLEUM & CHEM CORP
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