Method for continuously producing white carbon black by hypergravity technology

A white carbon black and supergravity technology, applied in the direction of silicon oxide, silicon dioxide, etc., can solve problems such as uneven distribution, long reaction time, and large product particles, to achieve enhanced mass transfer, overcome long reaction time, and uniform performance Effect

Inactive Publication Date: 2009-07-15
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process is simple, the raw materials are easy to obtain, and the operation is easy, but the reaction time is too long, the product particles are large, the distribution is uneven, and the purity is not high.

Method used

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  • Method for continuously producing white carbon black by hypergravity technology
  • Method for continuously producing white carbon black by hypergravity technology
  • Method for continuously producing white carbon black by hypergravity technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment adopts as figure 1 For the shown device, at first prepare a sodium silicate solution with a volume fraction of 10% and a dilute sulfuric acid with a mass fraction of 10%, weigh 150g of sodium chloride, add the sodium chloride and the sodium silicate solution to the barrel 6, and open The heating coil 8 starts heating, and at the same time, the circulation valve 11 is opened, the sulfuric acid addition valve 10 and the outlet valve 12 are closed, and the pipeline pump 9 is turned on, so that the feed liquid circulates in the circulation pipeline and is filtered through the filter net 4, and the rotameter 2 is adjusted. , make it reach 250L / h, turn on the rotary bed 3, and adjust its rotating speed to be 900rpm. After the temperature measured by the temperature probe 7 reaches 75°C, it will automatically keep warm for 10 minutes, then close the heating coil 8, open the outlet valve 12, close the circulation valve 11, open the sulfuric acid adding valve 10,...

Embodiment 2

[0028] Except that following condition changes, all the other conditions are the same as embodiment 1.

[0029] The mass fraction of dilute sulfuric acid is 20%, and the specific surface area of ​​the obtained white carbon black is 565.2m 2 / g, the DBP oil absorption value is 1.01mL / g, and the average particle size is below 10nm.

Embodiment 3

[0031] Except that following condition changes, all the other conditions are the same as embodiment 1.

[0032] The mass fraction of dilute sulfuric acid is 50%, and the specific surface area of ​​the obtained white carbon black is 525.9m 2 / g, the DBP oil absorption value is 1.19mL / g, and the average particle size is below 10nm.

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Abstract

The invention provides a method for producing white carbon black continuously by using supergravity technique. In a supergravity revolving bed, amorphous superfine white carbon black is produced by using the sulphuric acid sedimentation method through simultaneous continuous feeding and discharging ways. The mechanism of the method is identical with that of the traditional sulphuric acid sedimentation method, both taking sodium silicate as a silicon source, and taking dilute sulphuric acid as an acidulant. The raw material has low cost and is easily available. Meanwhile, the method is combined with the great intensified mass transferring and intensified micro mixing actions of the supergravity revolving bed, and has the advantage that the continuous production can avoid the unstability of the performance of the products in different batches, thereby lowering the production cost, reducing the auxiliary time of assembling, disassembling the equipment and charging and discharging in the intermittent reaction, and having even structure and stable quality.

Description

technical field [0001] The invention relates to a method for preparing an inorganic ultrafine powder material. The powder material is amorphous ultrafine silicon dioxide, commonly known as white carbon black, and the method used is a continuous supergravity inorganic acid precipitation method. Background technique [0002] White carbon black is a non-toxic, odorless, non-polluting inorganic non-metallic material, its microstructure is flocculent or net-like, and it is white powder. Because of its small particle size, large specific surface area, strong surface adsorption, large surface energy, high chemical purity, and good dispersion performance, it is widely used as rubber reinforcing agent, catalyst carrier, additive, decolorizer, matting agent, plastic filling agent, ink thickener, metal soft polishing agent, insulating filler, high-grade daily cosmetic filler, etc. It has become an indispensable additive in more than a dozen fields such as rubber, plastics, papermaking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 郭锴陈建峰付景坤赵光磊马丽丽
Owner BEIJING UNIV OF CHEM TECH
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