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Method for preparing silica sol in tubular slurry reactor

A slurry reactor, tube-and-tube technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as uneven heating

Active Publication Date: 2018-10-12
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tube-and-tube slurry reactor increases the contact area between the heating medium and the reactants, and overcomes the shortcomings of uneven heating

Method used

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  • Method for preparing silica sol in tubular slurry reactor
  • Method for preparing silica sol in tubular slurry reactor
  • Method for preparing silica sol in tubular slurry reactor

Examples

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Embodiment 1

[0022] A method for preparing silica sol in a tubular slurry reactor, its components are calculated in parts by mass, comprising the following process steps:

[0023] The particle size of silicon powder is 100 mesh, and the addition amount is 20 parts, added in 4 times; the lye is composed of 0.5 parts of KOH and 99.5 parts of water. The height of the reactor is 0.7m, and it is formed by arranging 6 slurry reaction tubes with an inner diameter of 14mm. The aspect ratio is 50:1. The outer diameter of the slurry reactor is 0.06m; the reaction temperature is 50°C, and the reaction time is 2 hours. The particle size of the obtained silica sol was 14 nm. image 3 A scanning electron microscope of silica sol was obtained for this example.

Embodiment 2

[0025] A method for preparing silica sol in a tubular slurry reactor, its components are calculated in parts by mass, comprising the following process steps:

[0026] The particle size of the silicon powder is 300 mesh, and the addition amount is 60 parts, added in 5 times; the lye consists of 0.5 parts of KOH, 0.5 parts of NaOH and 99 parts of water. The height of the reactor is 5m, and it is formed by arranging 60 slurry reaction tubes with an inner diameter of 20mm. The aspect ratio is 250:1. The outer diameter of the slurry reactor is 0.15m; the reaction temperature is 65°C, and the reaction time is 12 hours. The particle size of the obtained silica sol was 32 nm. Figure 4 A scanning electron microscope of silica sol was obtained for this example.

Embodiment 3

[0028] A method for preparing silica sol in a tubular slurry reactor, its components are calculated in parts by mass, comprising the following process steps:

[0029] The particle size of the silicon powder is 300 mesh, and the addition amount is 40 parts, added in 4 times; the lye is composed of 0.5 parts of NaOH and 99.5 parts of water. The height of the reactor is 4m, and it is formed by arranging 14 slurry reaction tubes with an inner diameter of 50mm. The aspect ratio is 80:1, and the outer diameter of the slurry reactor is 0.5m; the reaction temperature is 90°C, and the reaction time is 10 hours. The particle size of the obtained silica sol was 21 nm. Figure 5 A scanning electron microscope of silica sol was obtained for this example.

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Abstract

The invention discloses a method for preparing silicon sol by using a tubular slurry reactor and provides a reactor for preparing silicon sol, wherein an aim of homogeneous phase of the system is achieved by using the gas (H2) generated by silicon powder hydrolysis under the synergistic effect of the rising effect, the silicon powder settling and the liquid level rising in the tubular reactor. In the invention, with the stirring effect on the system caused by the gas generated by the silicon powder hydrolysis, dynamic balance among the silicon powder settling, alkali liquid rising and gas rising is realized so that the silicon powder is in a suspended state and does not settle to the tube bottom. Meanwhile, the bubbles (H2) generated by the silicon powder hydrolysis are of the same size and are generated in each position in the tube, and the gas distribution is uniform without dead angle. By adopting the tubular slurry reactor, the contact area between the heating medium and the reactants is increased, and the shortcoming of non-uniform heating is overcome.

Description

technical field [0001] The invention relates to a reactor for preparing silica sol, in particular to a method for preparing silica sol in a tubular slurry reactor. Background technique [0002] Silica sol refers to nano-scale SiO 2 The dispersion system in water is mainly used in chemical mechanical polishing (CMP), precision casting, textile, papermaking, industrial catalysis and other fields. Its industrial preparation methods are mainly ion exchange method and silicon powder hydrolysis method. The ion exchange method produces a large amount of waste water, and the operation is complicated. In comparison, the silicon powder hydrolysis method uses simple silicon powder and water as raw materials and alkali as a catalyst. It is easy to operate, and the process is environmentally friendly and pollution-free. [0003] CN203565067U discloses a silica sol reaction device, through the heating paddle on the stirring shaft, the purpose of stirring and system heating is achieved s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/141
Inventor 白云翔周波张春芳顾瑾孙余凭
Owner JIANGNAN UNIV
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