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Preparation method of silica gel carrier

A carrier, silica gel technology, applied in the direction of silicon oxide, can solve the problems of many silica gel components and complicated preparation process, and achieve the effect of avoiding re-agglomeration, simple preparation method and short process flow

Inactive Publication Date: 2006-07-19
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silica gel prepared by these patents has more components, and the preparation process is more complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put 200ml of deionized water into the reactor equipped with stirrer, temperature controller and pH meter, start the temperature controller and stirrer, make the temperature of the reactor temperature 85°C, and stir the speed at 3000 revolutions / min. To prepare solution A, first prepare a sodium silicate solution with a concentration of 0.3 mol / L, and then add the surfactant sodium dodecylbenzene sulfonate to this solution to make the concentration of sodium dodecyl benzene sulfonate 0.01 mol / l; Prepare sulfuric acid solution B, the concentration of B solution is 0.5mol / L. Solution A was added dropwise at a rate of 3 ml / min, while solution B was added dropwise, so that the pH value of the solution in the reactor was always maintained at 8.0, while maintaining the temperature and stirring speed of the reactor. Immediately stop adding solution B after dripping solution A, aging at a constant temperature for 1 hour under stirring, and let it stand overnight.

[0018] Add ammon...

Embodiment 2

[0020] The preparation process is the same as in Example 1. When the concentration of sodium silicate in solution A is 0.2 mol / L, the concentration of sodium lauryl sulfate is 0.01 mol / l, and the pH of the mixed solution is 8.5 when the solution is added in parallel, the temperature of the solution is At 80℃, the surface area of ​​the obtained silica gel carrier is 226m 2 / g, the most probable pore size distribution is 7.4803nm, the bulk density is 0.4847g / ml, and the particle size is 30nm.

Embodiment 3

[0022] The preparation process is the same as in Example 1. The concentration of sodium silicate in solution A is 0.5 mol / L, the concentration of surfactant Tween-80 is 0.015 mol / L, and the temperature of the mixed solution is maintained at 80°C and the pH value is maintained at 8.0. , The specific surface area of ​​the obtained silica gel is 255m 2 / g, the most probable distribution is 9.1850nm. The bulk density is 0.4389g / ml, and the particle size is 30nm.

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Abstract

The preparation method for silicagel carrier for polyolefin catalyst comprises: preparing silicate solution A with surfactant and dilute inorgaci acid solution B; adding solution A and B into reaction kettle, adjusting B solution for constant-temperature ageing; cooling, adding ammonium salt into the solution; after separating solid, filtering ,clearing, drying, grinding, and baking to obtain the objective product. This invention uses co-current flow method to form a great deal of crystal hucleus, decreases particle agglomeration and forms pore by space buffer action of surfactant, and can change the specific surface area and size and pore distribution of silicagel.

Description

Technical field [0001] The invention relates to a silica gel carrier, in particular to a method for preparing a silica gel carrier for polyolefin catalysts. Background technique [0002] Except for Ziegler-Natta homogeneous catalysts for polyolefin catalysts, metallocene olefin polymerization catalysts are all supported by silica gel. There have been many patent reports on the preparation method of silica gel, such as US5231066, JP2003192713, EP0505583, US5895770, US4100105, US4892853, US5372983 and so on. The US5625013 patent (Preparation of a supported catalyst for the polymerization of alpha-olefins) discloses that sodium or potassium water glass is introduced into a swirling inorganic acid aqueous solution through a special spray tube to form a hydrogel, which is directly washed and dried without aging. The diameter is 10-300nm, the specific surface area is 10-1000m 2 / g, the pore volume is 0.5~2.5cm 3 / g, a silica gel carrier with a pore size of 40~200. In the patent (CN140...

Claims

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Application Information

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IPC IPC(8): C01B33/113C08F4/02
Inventor 陈鸿博林昌健张慧陈建华
Owner XIAMEN UNIV
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