Preparation method of wear-resistant large-pore-volume microspherical silica carrier

A technology of spherical silica and large pore volume, applied in the direction of catalyst carriers, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of reduced mechanical strength and wear resistance of the carrier, the inability to greatly increase the wear resistance of the carrier, and sintering Poor performance and other problems, to achieve the effect of long service life, not easy to break, and stable performance

Inactive Publication Date: 2016-04-27
钟俊超
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, preparing a microspherical silica carrier with suitable pore structure, mechanical strength and wear resistance is a technical problem in this field, because silica raw materials such as precipitated silica and fumed silica are usually sintered The performance is poor; using silica sol as a binder can improve the mechanical strength and wear resistance of the silica carrier, but the effect is limited. Even after rec

Method used

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  • Preparation method of wear-resistant large-pore-volume microspherical silica carrier
  • Preparation method of wear-resistant large-pore-volume microspherical silica carrier

Examples

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Example Embodiment

[0040] Example 1

[0041] Take 1000g of calcined silica powder A, put it into a mixing tank, add 4000g of white carbon black emulsion A, turn on the stirring and beating, after the dispersion is uniform, use a homogenizer to grind and disperse to the average particle diameter of 5um, add 2000g activated carbon emulsion M (containing activated carbon 200g), mix well, pump into the centrifugal spray granulator preheated to 200℃ working temperature for granulation, adjust the speed of the feed pump and centrifuge, so that the obtained powder has an average diameter of 230um and a better sphericity Horizontally, the granulation is completed in 30 minutes, and the obtained granulated micropowder has better strength; half of the granulated micropowder is calcined at 680°C under aerobic conditions for 3 hours to obtain the macroporous volume microspherical silica carrier of the present invention. The average diameter of the measured carrier is 216um, the sphericity is good, and the stre...

Example Embodiment

[0042] Example 2

[0043] The other half of the granulated micropowder in Example 1 was calcined at 720°C for 3 hours to obtain the macroporous volume microspherical silica carrier of the present invention. The average diameter of the measured carrier is 213um, the sphericity is good, and the strength is good; the specific surface area is 158m 2 / g, the pore volume is 0.89ml / g, and the average pore diameter is 24nm; the measured wear rate and fragmentation rate are low. See the data listed in the table below for details.

Example Embodiment

[0044] Example 3

[0045] Take 1000g of calcined silica powder B, put it into a stirring tank, add 4000g of white carbon black emulsion C, turn on the stirring and beating, after the dispersion is uniform, use a homogenizer to grind and disperse to the average particle diameter of 5um, add 2500g of activated carbon emulsion M (containing activated carbon 250g), mix well, pump into the centrifugal spray granulator preheated to 240℃ working temperature for granulation, adjust the speed of the feed pump and centrifuge, make the obtained powder have an average diameter of 230um and a better sphericity Horizontally, the granulation is completed in 30 minutes, and the obtained granulated micropowder has better strength; half of the granulated micropowder is calcined at 680°C under aerobic conditions for 3 hours to obtain the macroporous volume microspherical silica carrier of the present invention. The average diameter of the measured carrier is 210um, with good sphericity and strength...

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Abstract

The invention provides a preparation method of a wear-resistant large-pore-volume microspherical silica carrier. The preparation method comprises the steps: roasting precipitated silica powder or white carbon black with the specific surface area of 250-600 m<2>/g at the temperature of 730-760 DEG C, and making the specific surface area reduced to 100-220 m<2>/g; adding water to the precipitated silica powder or white carbon black, adding an acid, adjusting the pH to 2-3, grinding and dispersing until the diameters of micro particles are all 1 [mu]m or less, adding the roasted silica powder, grinding and dispersing until the average diameter of micro particles is 2-5 [mu]m, adding an activated carbon emulsion, mixing evenly, carrying out spray granulation, roasting at the temperature of 650-720 DEG C, and thus obtaining the microspherical carrier with the average diameter of 50-250 [mu]m, the specific surface area of 80-200 m<2>/g, the pore volume of 0.7-1.1 ml/g, and the average pore diameter of 20-40 nm. The prepared microspherical silica carrier has the advantages of wear resistance and impact resistance, and is suitable for preparation of a catalyst for a fluidized bed.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a method for preparing a microspherical silica carrier, in particular to a method for preparing a wear-resistant microspherical silica carrier with a large pore volume. Background technique [0002] In addition to having a suitable pore structure, the catalyst should also have high mechanical strength and wear resistance, especially in the fluidized bed, between catalyst particles, between catalyst particles and the inner wall of the reactor, between catalyst particles and the solid phase in the fluidized bed There will be frequent friction and collision between the reaction raw materials or products, and the formed broken particles will expand the fluidized bed layer, and the formed finer powder, such as the part below 10-15um, is easy to blow off the fluidized bed, basically Scrapped. [0003] Preparing the carrier first, and then impregnating the active component is the most commonly u...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/08B01J35/08
CPCB01J21/08B01J35/08B01J35/1014B01J35/1019B01J35/1042B01J35/1047B01J35/1061
Inventor 钟俊超
Owner 钟俊超
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