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Continuous production device of amorphous silica gel and production method

A production device and amorphous technology, applied in chemical instruments and methods, silicon oxide, silicon dioxide, etc., can solve the problems of long production cycle, high energy consumption, unstable product quality, etc., to eliminate quality differences and improve production. The effect of efficiency

Pending Publication Date: 2017-08-18
上海华震科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of amorphous silica gel in the industry adopts a batch-type preparation process, which must go through steps such as mixing reaction, gelation, aging, hole expansion, water washing, and drying. Each step is equipped with special production equipment, and the production process is controlled separately. The quality of the final product is also affected by the SiO in the initial sodium hydroxide. 2 content, the pH value of the solution during gelation, gel aging time, temperature, washing treatment conditions, drying and other processes have a great influence, so the intermittent operation of batches will easily lead to unstable product quality, long production cycle and energy consumption. High, unstable product quality and other shortcomings

Method used

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  • Continuous production device of amorphous silica gel and production method
  • Continuous production device of amorphous silica gel and production method
  • Continuous production device of amorphous silica gel and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, adjust the screw extruder according to the process requirements for the preparation of amorphous silica gel; adjust the temperature of the mixing reaction section to 30°C, the temperature of the jacket of the aging section to 90°C, and the temperature of the washing section to 60°C, and then adjust the temperature of the 8% Sodium natrium and 18% sulfuric acid are preheated to 30°C in a storage tank and then continuously added to the screw extruder at a mass ratio of 1:0.75. The screw speed is controlled at 1 R / min, and the material is kept in the mixing reaction section for 2 hours. The aging section is kept for 4 hours, and then 60°C water is added to the screw extruder to rinse the material after the material advances to the water washing section. When the sodium ion at the outlet of the rinse water is less than 50ppm, the washing is stopped, and the product extrusion end of the screw extruder The extruded product was sent to a drying room at 400°C for drying, ...

Embodiment 2

[0025] According to the process conditions of Example 1, the screw speed is adjusted to 4.5R / min, so that the material is retained in the mixing reaction section for 1h, and the aging section is reserved for 1h. When the sodium ion concentration of the washing water outlet in the washing section is less than 50ppm, the washing is suspended. All the other conditions are not changed. The pore structure of the final silica gel product is: specific surface area: 150m 2 / g; Pore volume: 0.35ml / g; Pore diameter: 5.2nm.

Embodiment 3

[0027] Set the jacket temperature of the mixing reaction section and the aging section to 90°C, adjust the temperature of the water washing section to 80°C, and then add 10% sodium bicarbonate and 22% sulfuric acid to the screw extruder continuously at a mass ratio of 1:1.5 , control the screw speed to 0.7R / min, keep the material mixing reaction section for 3h, and the aging section for 6h, and then add 80°C water to the screw extruder to rinse the material after the material advances to the water washing section, and wait for the water at the outlet When the sodium ion concentration is less than 50ppm, the product is sent to a drying room at 600°C for drying. After crushing and screening, the pore structure of the silica gel product is: specific surface area: 220m 2 / g; Pore volume: 1.47ml / g; Pore diameter: 29.8nm.

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Abstract

The invention belongs to the technical field of amorphous silica gel production, and relates to achieving continuous production of amorphous silica gel by using a screw-rod extrusion machine. A continuous production device of the amorphous silica gel is characterized in that the outlet of a sodium silicate tank and the outlet of a sulfuric acid tank are connected with inlet pipelines of a feeding mechanism at the front end of the screw-rod extrusion machine through a metering pump separately; an inner cavity of a cylinder of the screw-rod extrusion machine is provided with a reaction segment, an aging segment and a water-washing extrusion segment in the flow direction of materials; in the reaction segment, sodium silicate and sulfuric acid are rapidly mixed and subjected to reaction to generate initial products which are white silica-gel pieces; in the aging segment, the initial products are soaked in hot water, aged and shaped; in the water-washing extrusion segment, a large amount of salt generated when sodium silicate reacts with sulfuric acid is washed away, and an product outlet at the extrusion end is connected and communicated with a product drying chamber. The continuous production device of the amorphous silica gel has the advantages that in combination with a traditional batch-type silica-gel preparation process, the steps of reaction, aging, water washing and the like are achieved in one screw-rod extrusion machine, during production, it is only necessary to observe whether or not various mechanical parts work normally, and it is unnecessary to adjust the continuous production device of the amorphous silica gel again. The continuous production device of the amorphous silica gel is conductive to continuous production in industries, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of amorphous silica gel production, and relates to a production device and a production method of amorphous silica gel, in particular to a continuous production device and production method of amorphous silica gel realized by a screw extruder. Background technique [0002] The main component of amorphous silica gel is silicon dioxide, which has a rigid skeleton structure and a good pore structure, and can be used in drug purification, DNA separation, food drying, and production of high-precision electronics. [0003] At present, the preparation of amorphous silica gel in the industry adopts a batch-type preparation process, which must go through steps such as mixing reaction, gelation, aging, hole expansion, water washing, and drying. Each step is equipped with special production equipment, and the production process is controlled separately. The quality of the final product is also affected by the SiO in th...

Claims

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Application Information

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IPC IPC(8): C01B33/154C01B33/158C01B33/16
CPCC01B33/154C01B33/158C01B33/16C01P2006/12C01P2006/14C01P2006/16
Inventor 江邦和杨峰刘爽
Owner 上海华震科技有限公司
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