Method for preparing precipitated white carbon black with controllable specific surface area

A technology of precipitation silica and specific surface area, applied in the direction of silicon dioxide, silicon oxide, etc.

Inactive Publication Date: 2010-01-06
通化双龙化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, changing the process conditions is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] use 5m 3 Enamel reaction kettle, add 2m of water glass with modulus 3.4 and specific gravity 1.085 3 , start the agitator at 60 rpm, heat up while stirring, when the temperature of the water glass solution rises to 85°C, keep the constant temperature, add 15% sulfuric acid for 40 minutes to react, and make the end point pH value of the suspension reach 9- 10; then the above reaction, water glass and sulfuric acid are added dropwise to the reaction, and 1m 3 The water glass is added dropwise in 55 minutes, and the pH value of the reaction process is kept unchanged at 9-10, and the temperature is kept at 85°C; following the above reaction, add acid to the reaction kettle separately, and use 30 minutes to remove the unreacted water in the reaction kettle The glass was completely reacted and the pH of the suspension was adjusted to 3. The suspension is filtered out the mother liquor with a chamber filter, and the filter cake is washed with water, and the water washing is ...

Embodiment 2

[0024] Different from Example 1, the bottom material adds water glass 1.7m 3 , when water glass and sulfuric acid are added dropwise in parallel, the amount of water glass added is 1.3m 3 , The product is not crushed.

Embodiment 3

[0026] What differs from embodiment 1 is that base material adds water glass 1.5m 3 , when water glass and sulfuric acid are added dropwise in parallel, the amount of water glass added is 1.5m 3 , The product is not crushed.

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Abstract

The invention relates to a preparation method of a chemical raw material, namely a method for preparing precipitated white carbon black with controllable specific surface area. The raw materials comprise water glass with modulus of 3.3-3.5 and water solution proportion of 1.085+/-0.001 and 15 percent of sulphuric acid. The method comprises the following steps: reaction: when the quantity of bottom material and the water glass is 30-80 percent of the total inventory rating, stirring, and rising the temperature to 84+/-1 DEG C, beginning to add the 15 percent of sulphuric acid for reaction, then adding the water glass and the sulphuric acid and keeping the pH value constant when the pH value of a suspending liquid reaches 9-10, finishing the addition of the left 70-20 percent of water glass within 55min, continuously adding the sulphuric acid to enable the water glass to completely react and adjusting the pH value to be 2-3; washing with water and drying: filtering the suspending liquid by a filter and drying by a spray dryer. The preparation method can be used for preparing the white carbon black with the specific surface area of 50-250 m<2>/g, which is particularly suitable for being used as rubber reinforcing filler.

Description

technical field [0001] The invention relates to a method for preparing chemical raw materials, that is, a method for preparing white carbon black by precipitation method with controllable specific surface area. Background technique [0002] In the prior art, the specific surface area is an important technical index of silica, which determines the application performance of silica to a large extent. In the Chinese chemical industry standard HG / T3061-1999, the specific surface integral of precipitated silica is divided into six categories: [0003] Classification of Precipitated Hydrated Silica [0004] category Specific surface area m 2 / g category Specific surface area m 2 / g A ≥191 D 106-135 B 161-190 E 71-105 C 136-160 F ≤70 [0005] Note: Precipitated hydrated silica, that is, precipitated white carbon black. [0006] At present, the production of precipitat...

Claims

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Application Information

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IPC IPC(8): C01B33/12C08K3/36C08L21/00
Inventor 杜崇恩白英杰
Owner 通化双龙化工股份有限公司
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