A kind of alumina carrier and preparation method thereof

A technology of alumina carrier and alumina sol, which is applied in the direction of catalyst carrier, chemical instruments and methods, organic chemistry, etc., can solve the problems of increased propane cracking reaction, carbon deposition, accelerated catalyst deactivation rate, etc., and achieve high carbon capacity , the effect of stability improvement

Active Publication Date: 2018-03-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, an excessively high reaction temperature will increase the propane cracking reaction, cause serious carbon deposition, and accelerate the catalyst deactivation rate. Therefore, the development of propane dehydrogenation catalysts with high activity, high selectivity and high stability has become the key to this technology

Method used

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  • A kind of alumina carrier and preparation method thereof
  • A kind of alumina carrier and preparation method thereof

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preparation example Construction

[0019] The preparation method of spherical carrier of the present invention comprises the following steps:

[0020] (1) Add acid peptization to aluminum hydroxide to obtain alumina sol, add pore expander to alumina sol, drop ball forming,

[0021] (2) After drying the wet balls formed in step (1), one-stage calcination is carried out at 620-680°C, and then the temperature is raised to 900-1100°C for two-stage calcination to obtain the carrier.

[0022] In the above-mentioned method, (1) step is to form with alumina sol dropping ball, the pore-enlarging agent that adds in aluminum sol preferably C 10 ~C 16 hydrocarbons, urea or ammonium carbonate. The C 10 ~C 16 The preferred hydrocarbon is kerosene, and the ammonium carbonate salt is preferably ammonium bicarbonate or ammonium carbonate.

[0023] The mass ratio of the added pore-enlarging agent to the alumina contained in the aluminum sol is 0.05-0.6, preferably 0.1-0.5.

[0024] There are many ways to prepare alumina so...

example 1

[0043] Get 27g of aluminum flakes, add 610 grams of hydrochloric acid solution with a concentration of 18% by mass, dissolve the aluminum flakes, obtain a solution with an aluminum chloride content of 4% by mass, transfer it to a neutralization tank, and add 850 grams of a solution with a concentration of 6% by mass. mass % ammonia water, mixed uniformly at 60°C, and the pH value is 7.5-8.5. The generated aluminum hydroxide was filtered and washed, and 9 mL of nitric acid with a volume ratio of 1:1 was added to the filter cake for acidification, and 40 mL of a solution containing 30 grams of urea and a hydrochloric acid solution containing 32 grams of stannous chloride were added under stirring to make the solution The Sn content in is 0.32% of dry base alumina quality, stirs 1 hour to acidify, then adds 30 grams of kerosene and 3 grams of nonylphenol polyoxyethylene ethers and stirs for 1 hour, in the sol with Al 2 o 3 The calculated solid content was 20% by mass. The sol i...

example 2

[0045] Prepare the alumina carrier according to the method of Example 1, the difference is to get 132 grams of aluminum hydroxide powder (produced by German Sasol company, brand SB, the alumina content is 76% by mass), add 100mL deionized water, stir for 1 hour to make it slurry Then add 9 mL of nitric acid with a volume ratio of 1:1 to acidify the aluminum sol, and the obtained tin-containing θ-Al 2 o 3 The physical properties of carrier b are listed in Table 1.

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Abstract

An alumina support has a specific surface area of ​​50-130m2 / g and a total pore volume of 0.5-1.0ml / g, and the pore volume of pores with a diameter of 2-10 nanometers in the support accounts for 4-15% of the total pore volume. The pore volume of pores with a diameter of 10-20 nm accounts for 40-60% of the total pore volume, the pore volume of pores with a diameter of 20-50 nm accounts for 1.0-5.0% of the total pore volume, and the diameter is greater than 50 nm but not greater than 10 The pore volume of micron macropores accounts for 20-50% of the total pore volume. The catalyst obtained after the carrier supports the active components is used for the reaction of producing olefins from the dehydrogenation of low-carbon alkanes, and has good reaction performance.

Description

technical field [0001] The invention relates to alumina and its preparation method, in particular to an alumina carrier and its preparation method. Background technique [0002] Propylene is an important basic organic chemical raw material, which is widely used in the production of various chemical products such as polypropylene, acetone, acrylonitrile, propylene oxide, and acrylic acid. At present, the supply of propylene mainly comes from the by-products of naphtha cracking to ethylene and petroleum catalytic cracking processes. Since the 1990s, with the increasing demand for propylene, the traditional propylene production process can no longer meet the demand for propylene in the chemical industry, and the development of other alternative process technologies must be accelerated. Among them, the process of propane dehydrogenation to propylene has attracted the most attention. By 2010, the propylene production capacity from the propane dehydrogenation unit accounted for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/04C07C11/06C07C5/333
CPCY02P20/52
Inventor 马爱增刘昌呈王春明
Owner CHINA PETROLEUM & CHEM CORP
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