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Preparation method of low-carbon hydrocarbon aromatization catalyst

An aromatization and catalyst technology, which is applied in the field of preparation of low-carbon hydrocarbon aromatization catalysts, can solve problems such as poor reaction stability of aromatization catalysts, alleviate frequent catalyst regeneration, improve mass transfer and diffusion capabilities, and alleviate Effects of Reactor Switching

Active Publication Date: 2014-11-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of poor reaction stability of aromatization catalysts in the prior art, and a new method for preparing low-carbon hydrocarbon aromatization catalysts is provided

Method used

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  • Preparation method of low-carbon hydrocarbon aromatization catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] NaZSM-5 molecular sieve raw powder (silicon-aluminum ratio is 20) and silica sol (SiO 2 Content 40%) were mixed at a weight ratio of 1:0.75, kneaded and extruded. After that, it was dried at 120° C. for 10 hours, and then pelletized. Add a mixture of 10 grams of tetrapropylammonium bromide, 20 grams of 1,6-hexanediamine and 50 grams of distilled water in advance in the reaction kettle, place a stainless steel mesh on the top of the mixture, place 20 grams of the formed molecular sieve on the stainless steel mesh, and seal Reactor. The gas-solid phase treatment was carried out at 150°C for 36 hours. After the product was taken out, it was washed with water, dried at 120°C for 10 hours, and then baked at 550°C for 4 hours to remove the template agent. Afterwards, the obtained material was exchanged three times with ammonium nitrate solution, washed twice with water, and dried at 120° C. for 10 hours to obtain an ammonia-type molecular sieve. The ammonia-type molecular...

Embodiment 2

[0022] The preparation process of the molecular sieve material and the catalyst is the same as [Example 1], except that the gas-solid phase treatment time of the reactor at 150° C. is extended to 72 hours.

Embodiment 3

[0024] The preparation process of the molecular sieve material and the catalyst is the same as [Example 1], except that the gas-solid phase treatment time of the reactor at 150° C. is extended to 144 hours.

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Abstract

The invention relates to a preparation method of a low-carbon hydrocarbon aromatization catalyst, mainly solving the problem of bad reaction stability of aromatization catalysts in the prior art. The method disclosed herein comprises the following steps: a) kneading 50-90 parts of ZSM-5 molecular sieve and 10-50 parts of binding agent for forming to obtain a formed catalyst precursor mixture I; b) putting the mixture I in vapor containing a template selected from at least one of tetrapropylammonium bromide, 1,6-hexanediamine, triethylamine orethylenediamine, and crystallizing for 10-240 h at 100-240 DEG C to obtain a catalyst precursor II without ZSM-5 molecular sieve; and c) washing the precursor II, carrying out ammonia exchange on the precursor II, and drying the precursor II, then loading at least one element selected from VIIIA, IIB and IIIB groups by dipping, wherein the loading amount is 0.1-10% of the weight of the precursor II. The method disclosed herein well solves the problem and can be used in the industrial production of the low-carbon hydrocarbon aromatization catalyst.

Description

technical field [0001] The invention relates to a preparation method of a low-carbon hydrocarbon aromatization catalyst. Background technique [0002] Aromatics are widely used in synthetic fibers, synthetic resins, synthetic rubbers and various fine chemicals, and are indispensable basic organic chemical raw materials; in addition, non-benzene aromatics are also important blending components for the production of high-octane gasoline. In recent years, the downstream products of aromatics have developed rapidly, leading to a continuous increase in the demand for aromatics in domestic and foreign markets. Among them, the annual growth rate of China's demand for aromatics is over 10%. [0003] C4-C6 low-carbon hydrocarbons and mixed hydrocarbons containing C4-C6 low-carbon hydrocarbons are secondary liquids in the petrochemical and oil refining industries, produced in ethylene projects, oil refineries and natural gas purification processes. Among the many low-carbon hydrocarb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40B01J29/46C07C15/02C07C2/76C07C5/41
Inventor 李玉宁任丽萍李亚男金照生滕加伟
Owner CHINA PETROLEUM & CHEM CORP