Method for preparing kaolin in-situ crystallization ZSM-5 molecular sieve

A technology of ZSM-5 and kaolin, which is applied in the field of synthesis and preparation of ZSM-5 molecular sieves, can solve problems such as low crystallinity and difficulty in reaching the level of industrial application, and achieve good stability, super strong vanadium-capturing passive nickel performance, Strong anti-metal pollution effect

Active Publication Date: 2008-12-31
北京惠尔三吉绿色化学科技有限公司 +1
View PDF6 Cites 46 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In these documents or patents, the crystallinity of ZSM-5 molecular sieve synthesized by in-s...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing kaolin in-situ crystallization ZSM-5 molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take 100 grams of kaolin, add 12 grams of sodium silicate and 86 grams of silica sol, mix well, grind, then put it into a muffle furnace, and roast at 1000 ° C for 3 hours to obtain roasted kaolin powder.

[0044] Add 108 grams of deionized water in the three-necked flask, then add 0.8 grams of NaOH and 13.31 grams of TPABr successively under stirring, and then add 60 grams of the above-mentioned roasted kaolin micropowder and 6.84 grams of pseudo-boehmite after stirring for 10 minutes, and stir for 10 minutes Then add 8.19 grams of NaCl successively, and the silicon-aluminum ratio is (SiO 2 / Al 2 o 3 ) is 3.80 grams of ZSM-5 molecular sieve of 40 as crystal seed. Stir for 10 minutes, then use sulfuric acid solution to adjust the pH value of the mixed slurry to 10, then raise the temperature of the reaction mixture to 30°C and stir for 2 hours, then transfer the mixture to a high-pressure crystallization kettle for crystallization at 150°C for 24 hours. After the rea...

Embodiment 2

[0046] Take 100 grams of kaolin, add 15 grams of sodium carbonate and 30 grams of silica gel powder, mix well, extrude into pellets, put them into a muffle furnace, and roast at 1100°C for 3 hours to obtain roasted kaolin pellets.

[0047] Add 72 grams of deionized water in the container, then add 0.96 grams of NaOH and 10.38 grams of TBAOH successively under stirring, and then add 53.33 grams of the above-mentioned roasted kaolin pellets and 16.15 grams of water glass after stirring for 10 minutes. Add 12.64 grams of NaCl, the ratio of silicon to aluminum is (SiO 2 / Al 2 o 3 ) is 8.27 grams of 40 ZSM-5 molecular sieves as seed crystals. Stir for 10 minutes, then use sulfuric acid solution to adjust the pH value of the mixed slurry to 10.5, then raise the temperature of the reaction mixture to 40°C and stir for 4 hours, then transfer the mixture to a high-pressure crystallization kettle for crystallization at 160°C for 30 hours. After the reaction, the product is filtered, ...

Embodiment 3

[0049] Take 1,000 grams of kaolin, add 2,000 grams of water, 500 grams of water glass, and 100 grams of silica sol. Grind with a ball mill for 60 minutes, and then use a small spray drying spray to form a sample of 960 grams. The sample is analyzed for particle size, and the content of 40-149um is 92%. The diameter is 63um. Kaolin microspheres were calcined in a muffle furnace at 1200° C. for 3 h to obtain calcined kaolin microspheres.

[0050] Add 64.8 grams of deionized water in the container, then add 1.12 grams of NaOH and 5.85 grams of n-butylamine successively under stirring, and then add 32.98 grams of the above-mentioned roasted kaolin microspheres and 20.77 grams of water glass after stirring for 10 minutes, and stir for 10 minutes Afterwards, 14.74 grams of NaCl and 1.48 grams of ZSM-5 molecular sieves with a silicon-aluminum ratio of (SiO2 / Al2O3) of 40 were added successively as seed crystals. Stir for 10 minutes, then use sulfuric acid solution to adjust the pH va...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a preparation method of kaolin in situ crystallization ZSM-5 molecular sieves and is characterized in that the internal and external surfaces of modified kaolin are provided with ZSM-5 molecular sieves by in situ crystallization; calculated by relative crystallinity, the relative content of the ZSM-5 molecular sieves in the kaolin is 30-80 %. The in situ crystallization ZSM-5 molecular sieves of the invention have the advantages of high crystallinity, small crystal grain, high activity and good stability.

Description

technical field [0001] The invention relates to a synthesis and preparation method of ZSM-5 molecular sieve, which is a method for preparing kaolin-based high-content ZSM-5 molecular sieve by in-situ crystallization. This kaolin-based ZSM-5 molecular sieve can be used as a catalyst or assistant in hydrocarbon conversion reactions such as catalytic cracking, aromatization, and hydrocracking, and has higher activity, better stability and selectivity. Background technique [0002] ZSM-5 molecular sieve has been widely used due to its good shape selectivity, and its introduction into catalytic cracking can shape-selectively crack low-octane components such as straight-chain alkanes in gasoline fractions, thereby improving gasoline octane Alkanes, and increase the yield of light olefins, especially propylene. The ZSM-5 molecular sieve prepared by the traditional method is not only complicated in the preparation process, but also has poor hydrothermal stability when the ZSM-5 mol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B39/38
Inventor 张瑞驰郭金宝李庆杰
Owner 北京惠尔三吉绿色化学科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap