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

A safe and low-energy-consumption forming method of titanium-silicon molecular sieve spray

A technology of titanium-silicon molecular sieve and molding method, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve problems such as low feed rate, difficulty in mixing uniformly, and high spray temperature

Active Publication Date: 2018-01-02
ZHENGZHOU UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, it is not easy to mix evenly with the original powder spray, and it is easy to block the nozzle
However, spraying with concentrated crystallization liquid or crystallization liquid and the original powder filter cake requires a higher spray temperature and a lower feed rate because the crystallization liquid contains more difficult-to-volatile organic compounds, which not only increases energy Consumption will also lead to safety hazards such as carbonization or explosion of organic matter

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
  • A safe and low-energy-consumption forming method of titanium-silicon molecular sieve spray
  • A safe and low-energy-consumption forming method of titanium-silicon molecular sieve spray
  • A safe and low-energy-consumption forming method of titanium-silicon molecular sieve spray

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 (preparation of titanium silicon molecular sieve crystallization solution and titanium silicon molecular sieve raw powder)

[0026] According to the method described in "Zeolites, 1992, Vol.12: 943-950", the nano-sized TS-1 molecular sieve crystallization solution was prepared.

[0027] Mix 382.5 g of tetraethyl orthosilicate with 178.5 g of tetrapropylammonium hydroxide, add 1046.6 g of distilled water, mix and hydrolyze at normal pressure and 60 °C for 1.0 h to obtain a hydrolysis solution of tetraethyl orthosilicate , slowly added a solution consisting of 18.7 g tetrabutyl titanate and 85 g anhydrous isopropanol under vigorous stirring, and stirred the resulting mixture at 75 °C for 3 h to obtain a clear transparent colloid. Put this into a stainless steel sealed reaction kettle, crystallize at a constant temperature at 170 °C for 72 h, and then quench it to obtain a crystallization solution of nano-sized titanium-silicon molecular sieve.

[0028] A small ...

Embodiment 2

[0029] Embodiment 2 (preparation of titanium silicon molecular sieve cluster)

[0030] Take 800 g of the titanium-silicon molecular sieve crystallization solution obtained in Example 1, add 16.8 g of a pre-agglomeration aid polyacrylamide solution with a mass fraction of 1‰, stir for a period of time, and add dilute nitric acid to adjust the pH of the crystallization solution to 7. Then suction filtration and separation can obtain millimeter-sized titanium-silicon molecular sieve clusters.

[0031] A small amount of titanium-silicon molecular sieve clusters was taken and dried overnight at 120 °C. Analysis showed that the mass fraction of titanium-silicon molecular sieve clusters was 30%. After calcining in air atmosphere at 550 ℃ for 6 h, the titanium-silicon molecular sieve raw powder was obtained. The obtained sample was subjected to XRD analysis, and there were five characteristic diffraction peaks with diffraction angles 2θ=7.8°, 8.8°, 23.2°, 23.8°, and 24.3°.

Embodiment 3

[0032] Embodiment 3 (titanium silicon molecular sieve cluster spray)

[0033] Take 74.1 g of the millimeter-sized titanium-silicon molecular sieve cluster obtained in Example 2, add 5.44 g of silica sol (mass fraction 30%), 1.146 g of white carbon black, and 19.33 g of citric acid aqueous solution (pH value is 3-5), and the slurry solidifies The content is 25%, and then beat evenly. The slurry was sprayed under the conditions of an inlet temperature of 190 °C, an outlet temperature of 70 °C, and a feed rate of 18 g / min.

[0034] The formed particles were calcined under programmed temperature conditions, the heating rate was 5 ℃ / min, and the calcination was performed at 230 ℃ for 20 min, at 350 ℃ for 60 min, and at 720 ℃ for 3 h in an air atmosphere. The shaped titanium-silicon molecular sieve particle A is prepared. The photographs were characterized by SEM scanning electron microscope as figure 1 As shown, the shape of the formed titanium-silicon molecular sieve is circula...

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
particle sizeaaaaaaaaaa
quality scoreaaaaaaaaaa
Login to View More

Abstract

The invention provides a safe low-energy-consumption forming method for a titanium-silicon molecular sieve spray. The method comprises the steps that an additive is added into hydro-thermal synthesized titanium-silicon molecular sieve crystallization liquid at first to enable the titanium-silicon molecular sieve crystallization liquid to be preclustered to a millimeter-sized cluster; organic matter such as most water and temple agent is separated out; the preclustered cluster is dispersed into an acid aqueous solution, spraying is carried out at the low inlet temperature and the high feeding speed to enable the cluster to achieve secondary dehydration so as to be clustered into micron-sized particles, roasting is carried out, and a spherical TS-1 catalyst is obtained. The problems that mixing is uneven and a spray head is blocked when raw powder spray is adopted are solved, and the potential safety hazard of organic matter carbonization or burning explosion caused when inlet and outlet temperature is too high during crystallization liquid concentration spraying is avoided.

Description

technical field [0001] The invention relates to a safe and low-energy-consumption forming method of titanium-silicon molecular sieve spraying. Background technique [0002] Since Taramasso first synthesized titanium-silicon molecular sieve catalysts in 1983, the molecular sieves have excellent catalytic properties for the epoxidation of alkenes, the oxidation of alkanes, the oxidation of alcohols, the hydroxylation of phenols and benzene, etc. It is one of the research hotspots of new materials for green chemical technology. Titanium-silicon molecular sieves have the advantages of catalytic oxidation activity, high product selectivity, and mild reaction conditions when used in ammoximation reactions, and are considered to be typical representatives of environmentally friendly catalysts. [0003] Patent EP0200260 studies the formation of titanium-silicon molecular sieve catalysts, first using SiO 2 Wrap titanium-silicon molecular sieve crystals, and then spray molding to ma...

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 Patents(China)
IPC IPC(8): B01J29/89
CPCB01J29/89B01J35/08
Inventor 王向宇叶晓雪高鑫刘杨青薛艳温贻强常中华
Owner ZHENGZHOU UNIV
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