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A kind of modified kaolin and its preparation method and application

A kaolin and modification technology, which is applied in the field of modified kaolin and its preparation, can solve the problems of unfavorable cost and energy consumption, layered structure damage, hard viscosity, etc., and achieve heavy oil cracking ability, activity and gasoline yield, energy low consumption and operating costs, and improved pore distribution

Active Publication Date: 2016-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the method of treating kaolin with acid in the prior art has no particularly obvious effect on improving the cracking performance of kaolin, especially the cracking performance of heavy oil, while the method of treating metakaolin with acid has to be roasted at a high temperature above 700°C. Transforming kaolin into metakaolin is very unfavorable in terms of cost and energy consumption, and after kaolin is roasted at a high temperature above 700°C, its layered structure is destroyed, hard and viscous, and it is difficult to disperse as a catalyst carrier

Method used

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  • A kind of modified kaolin and its preparation method and application
  • A kind of modified kaolin and its preparation method and application

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Embodiment approach

[0020] According to a preferred embodiment of the present invention, preferably the kaolin of the present invention is prepared according to the following steps: uniformly mix the kaolin raw material and aqueous sulfuric acid solution, and perform the first heat treatment on the obtained mixture; wash and filter the solid after the first heat treatment, The filtered solids are subjected to a second heat treatment.

[0021] The method for modifying kaolin provided by the present invention does not need to roast kaolin at a high temperature above 700°C to transform it into metakaolin, so the energy consumption and operating cost are relatively low, and the prepared modified kaolin has at least the aforementioned properties of the present invention. Compared with the catalyst made of unmodified kaolin, the heavy oil cracking ability, activity and gasoline yield of the cracking catalyst used as a carrier have been significantly improved. It can be seen that the method of the prese...

Embodiment 1

[0035]Kaolin (produced by Suzhou Kaolin Industry Co., Ltd., whose chemical composition is shown in Table 1, the following examples and comparative examples are the same) and sulfuric acid aqueous solution (concentration is 85% by weight) according to the weight of sulfuric acid: kaolin (on a dry basis) = 0.4:1 Mix evenly, put the resulting mixture in a muffle furnace and dry at 150°C for 1.5 hours, take out the product after cooling, then slurry and wash the product with deionized water 5 times the weight of the original kaolin at 80°C for 40 minutes, filter After being pumped into a filter cake, it was washed with deionized water 5 times the weight of the original kaolin, and the filtered product was dried at 120°C for 12 hours.

Embodiment 2

[0037] Mix kaolin and sulfuric acid aqueous solution (concentration: 98% by weight) according to the weight ratio of sulfuric acid: kaolin (on a dry basis) = 0.5:1, put the resulting mixture in a muffle furnace and roast at 240°C for 1.5 hours, take it out after cooling product, then the product was slurried and washed at 80°C for 40 minutes with deionized water 5 times the weight of the original kaolin and filtered, then the filter cake was washed with deionized water 5 times the weight of the original kaolin and filtered, after filtration The product was dried at 120°C for 12 hours, and the obtained modified kaolin sample was recorded as B-2, and its physical and chemical characterization results are listed in Table 1.

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Abstract

The invention provides modified kaolin and a preparation method thereof. The method comprises the following steps: uniformly mixing a kaolin raw material and a sulfuric acid aqueous solution; performing first thermal treatment on the obtained mixture; washing the solid subjected to first thermal treatment with water; filtering; and performing second thermal treatment on the filtered solid. The invention further provides application of the modified kaiolin in catalytic cracking. According to the modified kaolin, the pore distribution is obviously improved, and the superficial area and pore volume of the kaolin are increased; a cracking catalyst prepared through the modified kaolin serving as a carrier has the heavy oil cracking capacity, activity and gasoline yield superior to those of the catalyst prepared by the non-modified kaolin.

Description

technical field [0001] The invention relates to a modified kaolin and its preparation method and application. Background technique [0002] Kaolin is the most commonly used filling component in catalytic cracking (FCC) catalysts. In addition to acting as a catalyst matrix, it can also provide active centers and reaction sites for the cracking of some macromolecules. Soil is directly used as a carrier for the preparation of cracking catalysts, while raw kaolin clay has a small surface area and pore volume, and a small number of active centers, so its ability to crack macromolecules is actually extremely limited. Its role in the catalyst is mainly as a matrix. Provide the necessary physical properties for the catalyst. [0003] With the development of the oil refining industry in the direction of deep processing, heavy oil catalytic cracking by blending heavy fractions with a boiling point greater than 500 ° C has become an important way to improve economic benefits, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40B01J21/16C10G11/02
Inventor 袁海亮潘兴红周平石磊
Owner CHINA PETROLEUM & CHEM CORP
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