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Light hydrocarbon aromatization catalyst and preparation method thereof

A catalyst and aromatization technology, which is applied in the field of aromatization catalyst containing zinc and its preparation field, can solve the problems of less than 20% of total utilization rate, low utilization rate of refinery gas, large amount of carbon deposits on catalyst, etc. The effect of low yield, low carbon deposition and long life per pass

Inactive Publication Date: 2011-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 aromatization catalyst and preparation method thereof
  • Light hydrocarbon aromatization catalyst and preparation method thereof
  • Light hydrocarbon aromatization catalyst and preparation method thereof

Examples

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preparation example Construction

[0024] The preparation method of the catalyst of the present invention includes adding silica sol to HZSM-5 powder, making the mass ratio of silica sol and HZSM-5 0.3 to 20.0:1, preferably 0.5 to 15.0:1, kneading evenly, and extrusion molding , drying and calcining to obtain a composite carrier, impregnating the composite carrier with a solution containing a zinc compound and a rare earth compound, then drying, calcining, and treating with water vapor at 450-700°C.

[0025] The pH value of the silica sol is not greater than 6.0, preferably not greater than 4.0, and more preferably 1.0 to 4.0. If the pH value of the acidic silica sol does not meet the requirements, nitric acid, hydrochloric acid, formic acid or acetic acid can be added, preferably nitric acid to adjust the pH of the silica sol. pH. The silicon oxide content of the silica sol is 5-70% by mass, preferably 30-40% by mass, and the particle size of the solid particles in the silica sol is 10-50 nm, preferably 20-30 ...

example 1

[0032] Preparation of the catalyst of the present invention.

[0033] (1) Preparation of composite carrier

[0034] Get 50g of HZSM-5 zeolite powder (zeolite content 95% by mass) with a silica / alumina molar ratio of 55, add 68g of acidic silica sol with a pH value of 4 and a particle size of 20 nm (with a silica content of 30% by mass, Beijing Hengtai Kaida Science and Trade Co., Ltd.), kneaded evenly, then extruded, dried at 110°C for 4 hours, and roasted at 550°C for 4 hours to obtain a composite carrier, which contained 70% by mass of HZSM-5 zeolite, 30% by mass of silica.

[0035] (2) Preparation of catalyst

[0036] Get 50 grams of composite carrier, use 50 grams of zinc nitrate containing 4.7 mass %, mixed rare earth chloride (its oxide composition is 31 mass % of lanthanum oxide, 51 mass % of cerium oxide, 14 mass % of praseodymium oxide, 4 mass % of neodymium oxide) The solution of 4.5% by mass was soaked at 25°C for 1 hour, dried at 110°C for 8 hours, calcined at 5...

example 2

[0038] Composite carrier is prepared according to the method of example 1 (1) step, the difference is that the acidic silica sol used is 158g, after extruding, drying and roasting, the obtained HZSM-5 zeolite content is 50% by mass, and the silicon oxide content is 50% by mass Composite carrier b. Get above-mentioned composite carrier, introduce zinc and mixed rare earth according to the method for example 1 (2) step, make catalyst B after steam treatment, its composition and physical property are shown in Table 1.

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Abstract

The invention provides a light hydrocarbon aromatization catalyst which comprises a composite carrier and modified components, wherein the modified components comprise the following compositions which are calculated based on the carrier in mass percentage by mass percent: 1.0-10.0% of ZnO, 0.5 to 10.0% of rare earth oxide; the composite carrier comprises 10 to 90% of H zeolite socony mobile-5 (HZSM-5) and 10 to 90% of silica. The catalyst preparation is simple and has high aromatization activity and selectivity on light hydrocarbon, and the carbon-depositing amount of the catalyst after reaction is less. With mixed C4 as a raw material for aromatization reaction, the yield of aromatics reaches 50 % by mass and the one-way service life of the catalyst lasts as long as 700 hours.

Description

technical field [0001] The invention relates to a light hydrocarbon aromatization catalyst and a preparation method thereof, in particular to a zinc-containing 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 poor, and it is ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C10G45/68
Inventor 于中伟王子健孙义兰陈春芳
Owner CHINA PETROLEUM & CHEM CORP
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