Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Modification method for small-grain NaY type molecular sieve

A molecular sieve and small-grain technology, applied in crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., can solve the problem of poor hydrothermal stability of small-grain NaY molecular sieve and fine-grain Y-type molecular sieve. Poor properties, complex process steps and other problems, to achieve high crystallinity, good performance, and facilitate the effect of diffusion

Active Publication Date: 2015-08-12
CHINA PETROLEUM & CHEM CORP +1
View PDF9 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The method for preparing fine-grained Y-type molecular sieves proposed in CN1081425A is to precrystallize the NaY synthesis solution at 80°C to 180°C for 1 to 10 hours, then add the directing agent after cooling to room temperature, and then add the directing agent at 80°C to 100°C. Continue to crystallize for 5 to 25 hours, the process steps are more complicated and difficult to control, and the hydrothermal stability of the fine-grained Y-type molecular sieve obtained is poor
[0014] At present, due to the poor hydrothermal stability and unstable structure of small-grain NaY molecular sieves, small-grain Y-type molecular sieves with complete structure, high crystallinity and many secondary pores cannot be obtained after subsequent modification.

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
  • Modification method for small-grain NaY type molecular sieve
  • Modification method for small-grain NaY type molecular sieve
  • Modification method for small-grain NaY type molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment is to prepare raw material small grain NaY molecular sieve

[0050] Preparation of NY-1

[0051] (1) Preparation of guiding agent: Dissolve 10 g of sodium hydroxide solid in 80 g of water, add 2 g of sodium metaaluminate (Al 2 o 3 Content is 45wt%, Na 2 O content is 41wt%), then add 36g water glass (SiO 2 Content is 28wt%, Na 2 O content is 8 wt%), mixed evenly and aged at 15°C for 4 hours to prepare the directing agent.

[0052] (2) Preparation of amorphous silicon-aluminum precursor

[0053] Prepare solid sodium aluminate to a concentration of 40gAl 2 o 3 / L sodium aluminate working solution, take SiO 2 28wt% sodium silicate solution, then diluted to a concentration of 100g SiO 2 / L sodium silicate working solution. Take 1L of sodium aluminate working solution and place it in a gel-forming tank, then add 0.2L of sodium silicate working solution, control the reaction temperature at 20°C, and feed CO with a concentration of 50v%. 2 gas, stop ...

Embodiment 2

[0067] First, carry out alkali treatment on the raw material small-grain NaY molecular sieve, beat and mix 1000 grams of NY-1 with 5 L of NaOH solution with a concentration of 1 mol / L, and maintain the temperature of 80 ° C for 2 hours, filter and wash to the solution Close to neutrality; contact the filter cake with 10 liters of 0.5 mol / L ammonium nitrate aqueous solution, stir at 300 rpm, stir at 90°C for 1 hour, then filter molecular sieves, and leave a small sample for analysis of Na 2 O content; repeat the above operation until Na in the molecular sieve 2 The O content reached 2.5wt%, and the sample number after drying was NNY-1.

Embodiment 3

[0069] First, carry out alkali treatment on the raw material small-grain NaY molecular sieve, beat and mix 1000 grams of NY-2 with 5 L of KOH solution with a concentration of 0.8 mol / L, and keep stirring at 80°C for 2 hours, filter, and wash with water until the solution Close to neutral; contact the filter cake with 10 liters of 0.5 mol / L ammonium nitrate aqueous solution, stir at 300 rpm, stir at a constant temperature of 95 ° C for 1 hour, then filter molecular sieves, and leave a small sample for analysis of Na 2 O content; repeat the above operation until Na in the molecular sieve 2 The content of O reached 2.5wt%, and the number of the dried sample was NNY-2.

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

PropertyMeasurementUnit
diameteraaaaaaaaaa
specific surface areaaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a modification method for a small-grain NaY type molecular sieve. According to the method, a NaY type molecular sieve raw material with a high silica-alumina ratio, a high degree of crystallization and good stability is employed and successively undergoes alkali washing, ammonium exchange, aluminum removal and silicon supplement, hydro-thermal treatment and treatment with a mixed solution of acid and an ammonium salt; and the obtained small-grain Y type molecular sieve has a high SiO2 / Al2O3 mol ratio and a high proportion of secondary pores, retains the stability of a Y type molecular sieve and has a high specific surface area and a high degree of crystallization. The small-grain Y type molecular sieve prepared in the invention is applicable as a cracking component for a hydrocracking catalyst used for high and medium oil and enables the hydrocracking catalyst to have good activity, medium oil selectivity and product properties.

Description

technical field [0001] The invention relates to a modification method of NaY molecular sieves, in particular to a modification method of small grain NaY molecular sieves. Background technique [0002] Y-type molecular sieve is currently the most common cracking active component in the field of heavy oil cracking. The crystal grain is generally about 1000nm. After the reaction, the product is also difficult to diffuse out, so its cracking activity and selectivity of the target product are restricted. Compared with conventional Y-type molecular sieves, small-grain Y-type molecular sieves have a larger outer surface area and more active centers on the outer surface, which is conducive to improving the cracking capacity of macromolecular hydrocarbons, and thus has superior catalytic performance. At the same time, reducing the grain size of the Y-type molecular sieve can also improve the utilization rate of active sites on the inner surface. In general, the diffusion of reactan...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
Inventor 孙晓艳樊宏飞王占宇
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com