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Macroporous microsphere silica gel and preparation thereof

A technology of macroporous microspheres and silica gel, applied in chemical instruments and methods, silicon oxide, silicon dioxide, etc., can solve problems such as deep oxidation, lower separation efficiency, lower yield of target products, etc., and achieve production cost reduction, process The effect of easy operation and low raw material price

Active Publication Date: 2008-06-25
李永兆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a kind of macroporous microsphere silica gel and its preparation method, which can solve the problems existing in the prior art, such as reduced separation efficiency, deep oxidation and reduced yield of target product, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Sodium silicate solution with a concentration of 26% and dilute sulfuric acid with a concentration of 30% react step by step in a swirling granulation device and are sprayed into the air through the nozzle of the granulation device, and then polycondensed to form gel particles. After 1-12 hours of aging, soak in any salt solution of 1.0% sodium carbonate, sodium bicarbonate, potassium nitrate, and sodium hydroxide for 10 hours, and soak it in an acid solution with a concentration of 5%. Washing and drying with water, and then performing surface treatment at a high temperature of 700°C, the macroporous microsphere silica gel of the present invention is obtained. The test results are as follows: the macroporous microsphere silica gel has a pore volume of 1.32mL / g and a specific surface area of ​​218m 2 / g, pore size 24.2nm.

Embodiment 2

[0018] The gel-making conditions and post-treatment are exactly the same as in Example 1, but in the inorganic salt soaking process, any two mixed salts of 1.0% sodium carbonate, sodium bicarbonate, potassium nitrate, and sodium hydroxide are used for soaking. Pore ​​volume 1.34mL / g, specific surface area 190m 2 / g, pore size 28.2nm.

Embodiment 3

[0020] Be that 28% sodium silicate solution and 32% dilute sulfuric acid are used to make gel, and then the post-treatment process is exactly the same as example 1, but the concentration is 1.0% sodium carbonate, sodium bicarbonate, nitric acid in the inorganic salt soaking process Soak in any three mixed salt solutions of potassium and sodium hydroxide. The result of macroporous microsphere silica gel measurement is that the pore volume is 1.50mL / g, and the specific surface area is 132m 2 / g, pore size 45.4nm.

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Abstract

The invention provides a method for preparing silica gel with macrospore and microsphere, which can solve the problems in the prior art that separation efficiency is decreased, deep oxidation easily occurs in catalyzing process and yield of target product is reduced. The technical proposal of the invention is as follows: average aperture of the silica gel with macrospore and microsphere is 10 to 60nm; specific surface area is 100 to 400m<2> / g; pore volume is 1.00 to1.60ml / g; and grain diameter is between 50 to 900Mum. The inventions is characterized by cheap price of raw materials, simple working procedure and easy operation as well as greatly reducing of producing cost of the silica gel with macrospore and microsphere, which is in particular suitable for separation and purification of biomacromolecule and Chinese herbal medicine.

Description

technical field [0001] The invention relates to the technical field of inorganic silicon chemical industry, in particular to a catalyst for polymer polymerization, a catalyst carrier, macroporous microsphere silica gel for rapidly separating and purifying Chinese herbal medicines and biomacromolecules, and a manufacturing method thereof. Background technique [0002] Silica gel has a loose and porous structure and is widely used in industrial production, daily life and other fields. In the field of chemical engineering, silica gel can be used as a carrier for catalysts. For the carrier, the key factors affecting its performance are the pore volume, pore diameter and specific surface area of ​​the particles. For the polymer polymerization reaction, its molecules are relatively large, so the pore size of the catalyst carrier required for the reaction is relatively large, otherwise coking is easily formed. In the field of separation and purification of biomacromolecules, the ...

Claims

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Application Information

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IPC IPC(8): C01B33/14C01B33/157C01B33/16B01J32/00
Inventor 李永兆
Owner 李永兆