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Method for preparing modified kaolin with mixed acid

A kaolin, modified technology, applied in chemical instruments and methods, catalyst activation/preparation, catalytic cracking, etc., can solve problems such as consumption, high energy consumption, production cycle, and difficulty in industrial production, and achieve cost reduction and good adhesion performance effect

Active Publication Date: 2011-09-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies are to use the acid-modified kaolin after filtering and washing. The purpose of doing this is mainly because the pH of the acid-modified kaolin slurry is often too low. If it is directly added to the catalyst, it will destroy the catalyst. Molecular sieve, which in turn affects the performance of the catalyst, but because the particles of kaolin are very small, it is difficult to filter and it is difficult to carry out large-scale industrial production, and it will inevitably consume higher energy consumption and production cycle

Method used

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  • Method for preparing modified kaolin with mixed acid
  • Method for preparing modified kaolin with mixed acid
  • Method for preparing modified kaolin with mixed acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Put 500 grams of kaolin A into a 1000 ml quartz crucible, bake it at 650° C. for 3 hours, and cool it down to obtain roasted kaolin A1.

[0075] Get 150 grams (dry basis) of roasting kaolin A1, pour in the enamel reactor that 770g acidic solution (containing the HCl of 4.6wt%, the nitric acid of 0.5% and the tartaric acid of 6.8wt%) is housed, add 80 grams ( dry base) basic aluminum chloride, reacted at 110° C. for 1 hour, cooled to obtain the mixed slurry B1 containing modified kaolin of the present invention, filtered and washed B1, dried, and analyzed the pore structure. The results are shown in Table 3 .

Embodiment 2

[0077] 500 grams of kaolin A are packed into a 1000 ml quartz crucible, roasted at 730°C for 2 hours, and then cooled to obtain roasted kaolin A2.

[0078] Get 100 grams (dry basis) of roasted kaolin A2, pour it into an enamel reaction kettle equipped with 820g acidic solution (containing 10.5wt% HCl and 2.1wt% acetic acid), mix well and add 60 grams (dry basis) of basic formula Aluminum chloride and 20 grams (dry basis) of metal aluminum powder were reacted at 95° C. for 2.5 hours, cooled to obtain the mixed slurry B2 containing modified kaolin of the present invention, dried after filtering and washing B2, and carried out pore structure analysis , the results are shown in Table 3.

[0079] Table 3 Characterization results of pore structure

[0080]

[0081] It can be seen from the data in Table 3 that the modified kaolin prepared by the present invention has a large pore volume, especially a relatively high proportion of medium and large pores.

Embodiment 3

[0083] 500 grams of kaolin A are packed into a 1000 ml quartz crucible, fired at 870° C. for 1 hour, and then roasted kaolin A3 is obtained after cooling.

[0084] Get 380 grams (dry basis) of calcined kaolin A3, pour in the enamel reactor that 600g acidic solution (containing the HCl of 28wt% and the oxalic acid of 3.5wt%) is housed, react at 115 ℃ for 1.5 hours, cool, make this For the invented mixed slurry B3 containing modified kaolin, B3 was filtered, washed and dried, then aged at 800°C and 100% water vapor for 6 hours, and the pore structure of the samples before and after aging was analyzed. The results are shown in Table 4.

[0085] Table 4 Pore structure characterization before and after aging

[0086]

[0087] As can be seen from the data in Table 4, the pore structure of the modified kaolin prepared by the present invention shows good hydrothermal stability, and the pore volume retention rate after aging reaches more than 70%, especially the large pores in the mod...

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PUM

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Abstract

The present invention relates to a method for modifying kaolin. The method comprises the following steps: calcined kaolin, applied aluminum source and an acid solution are added to a container in a stirring state; a mixed slurry is obtained after a uniform stirring process, and substances in the mixed slurry are subjected to a reaction through heating the mixed slurry to obtain a new slurry; and the new slurry can be used as raw materials for preparing a catalytic cracking catalyst with no filtering. The method is characterized in that the acidic solution is a mixed acid system comprising inorganic acid and organic acid. The modified kaolin has developed middle / large pore volumes, a favorable hydrothermal stability and certain L acid characteristics. A catalyst prepared from the modified kaolin slurry has a high heavy oil conversion capability.

Description

technical field [0001] The invention relates to a method for modifying kaolin, in particular to a method for preparing modified kaolin with mixed acid. The modified kaolin is suitable for the preparation of catalytic cracking catalyst. Background technique [0002] With the growth of the world economy, the demand for energy is increasing day by day. As one of the most important energies in the world today—petroleum will be further developed, so the oil refining industry will still maintain its dominant position in energy utilization in the 21st century. In my country, the fluid catalytic cracking unit (FCCU) has always been the most important secondary processing unit in refineries due to its strong adaptability to raw materials, high yield of light oil products, and high octane number of gasoline; Cracking undertakes the production tasks of 75% of gasoline, 35% of diesel and propylene in my country, so catalytic cracking is also called the heart of refineries in China. The...

Claims

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Application Information

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IPC IPC(8): B01J21/16B01J37/00B01J35/10B01J29/08C10G11/05
Inventor 高雄厚王宝杰赵连鸿张海涛张忠东马建刚刘超伟张莉赵晓争曹庚振熊晓云
Owner PETROCHINA CO LTD
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