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Method for synchronization of silicon hydrolysis reaction and tubular membrane separation

A technology of hydrolysis reaction and tubular membrane, which is applied in the field of silicon hydrolysis and can solve problems such as imbalance

Inactive Publication Date: 2014-02-26
NANJING DINGSHIHE MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to make up for the deficiencies in the prior art, to provide a method for synchronously carrying out reaction and separation to keep the reaction in an unbalanced state; to provide a staggered tube-membrane separation method to completely hydrolyze silicon powder and solve membrane surface pollution problems, making the process continuous and stable

Method used

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  • Method for synchronization of silicon hydrolysis reaction and tubular membrane separation
  • Method for synchronization of silicon hydrolysis reaction and tubular membrane separation
  • Method for synchronization of silicon hydrolysis reaction and tubular membrane separation

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Embodiment 1

[0020] A method for synchronously carrying out silicon hydrolysis reaction and tubular membrane separation, its components are calculated in parts by weight, comprising the following process steps:

[0021] After sieving, the maximum particle size is 0.5mm, the amount of silicon powder with an average particle size of 0.2mm is 7g / min, and the feed amount of the hydrolyzate composed of 1 part of NaOH and 99 parts of water is 1000g / min. The conical reactor The taper is 15°, the height is 2m, the flow velocity of the hydrolyzate at the feed port is 0.5m / s, and the hydrolysis reaction temperature is 50°C. The separation section uses a PES tubular membrane with an inner diameter of 8 mm and a polyester non-woven fabric as the supporting tube layer. The membrane pore diameter is 0.1 μm. The membrane tubes are arranged in an equilateral triangle, the tube spacing is 16 mm, and the height of the membrane separation section is 1 m. Adjust the suction vacuum to keep the permeate volume ...

Embodiment 2

[0023] A method for synchronously carrying out silicon hydrolysis reaction and tubular membrane separation, its components are calculated in parts by weight, comprising the following process steps:

[0024] After sieving, the maximum particle size is 0.3mm, the amount of silicon powder with an average particle size of 0.15mm is 6g / min, and the feed amount of the hydrolyzate composed of 1 part of NaOH and 95 parts of water is 1000g / min. The conical reactor The taper is 15°, the height is 2m, the flow velocity of the hydrolyzate at the feed port is 0.4m / s, and the hydrolysis reaction temperature is 60°C. The separation section uses a polysulfone tubular membrane with an inner diameter of 8mm and a polyester non-woven fabric as the support tube layer. The membrane pore diameter is 0.08μm. The membrane tubes are arranged in an equilateral triangle, the tube spacing is 18mm, and the height of the membrane separation section is 1m. Adjust the suction vacuum to keep the permeate volu...

Embodiment 3

[0026] A method for synchronously carrying out silicon hydrolysis reaction and tubular membrane separation, its components are calculated in parts by weight, comprising the following process steps:

[0027] After sieving, the maximum particle size is 0.2mm, the amount of silicon powder with an average particle size of 0.12mm is 8g / min, and the feed amount of the hydrolyzate composed of 1 part of KOH and 95 parts of water is 1500g / min. The conical reactor The taper is 30°, the height is 2m, the flow velocity of the hydrolyzate at the feed port is 0.3m / s, and the hydrolysis reaction temperature is 60°C. The separation section uses a PES tubular membrane with an inner diameter of 10mm and a polyester non-woven fabric as the support tube layer. The membrane pore diameter is 0.1 μm. The membrane tubes are arranged in an equilateral triangle, the tube spacing is 14mm, and the height of the membrane separation section is 1m. Adjust the suction vacuum to keep the permeate volume at 1L...

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Abstract

The invention relates to a silicon hydrolysis technology and particularly relates to a method for synchronization of silicon hydrolysis reaction and tubular membrane separation. According to the method, a balancing technology which is used for balancing the gravity, buoyancy and settling resistance stood by silicon powder grains in a hydrolysis solution during hydrolysis, a countercurrent-contact reaction technology and a tubular membrane separation technology are used, so that a reaction product is separated from reactants in time; meanwhile, tubular membranes are of staggered arrangement, and hydrogen gas generated during silicon hydrolysis reaction plays a role in stirring unreacted silicon powder deposited on the outside surfaces of the tubular membranes in annular gaps among the tubular membranes, so that the surface pollution of the membranes is lightened; the unreacted silicon powder intercepted on the outside surfaces of the membranes is subjected to periodical directional cleaning in a pressure-driven manner, so that the complete hydrolysis of the silicon powder is guaranteed, and the completeness and continuity of reaction are realized.

Description

technical field [0001] The invention relates to a silicon hydrolysis technology, in particular to a method in which hydrolysis reaction and tubular membrane separation are carried out synchronously. Background technique [0002] Generally, there are several methods for preparing silica sol: one-step dissolution method of elemental silicon, ion exchange method, direct acid neutralization method, electrolytic electrodialysis method, peptization method and dispersion method, etc. In industrial production, the one-step dissolution method and ion exchange method of elemental silicon are usually used. [0003] Patent CN86104144A directly mixes silicon powder with Na 2 SiO 3 or K 2 SiO 3 React, add slowly, after the reaction is completed, cool while stirring, and filter at 50°C to remove unreacted silicon powder. In patent CN101121520A, silicon powder is hydrolyzed under the action of basic catalyst [0004] Add it into deionized water to prepare a seed solution, add silicon ...

Claims

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Application Information

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IPC IPC(8): C01B33/32
Inventor 孙余凭顾瑾白云翔
Owner NANJING DINGSHIHE MEMBRANE TECH CO LTD
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