Preparation method of white carbon black, as well as white carbon black

A technology of white carbon black and sodium sulfate, applied in the field of white carbon black, can solve the problems of large water consumption, difficult to control the sodium sulfate content index, etc., and achieve the effect of reducing the water consumption for washing

Active Publication Date: 2013-01-30
ZHUZHOU XINGLONG CHEM IND
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Problems solved by technology

[0004] The invention solves the technical problems of large water consumption and difficult control of the sodium sulfate content index in the product in the tradi

Method used

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] A preparation method of white carbon black, comprising the following steps:

[0016] S1, white carbon black synthesis: mix the water glass solution with concentrated sulfuric acid, and obtain a white carbon black synthesis solution after the reaction;

[0017] S2, white carbon black coarse filtration: the white carbon black synthesis solution obtained in step S1 is first dehydrated by membrane filtration to obtain sodium sulfate aqueous phase mother liquor and white carbon black slurry material, and sampling analysis is obtained to obtain the sodium sulfate content in the white carbon black slurry material ;

[0018] S3, white carbon black washing: according to the sodium sulfate content in the white carbon black slurry material obtained in step S2, add washing water to the white carbon black slurry material according to the content of required sodium sulfate and the solubility of sodium sulfate in the white carbon black product, The amount and temperature of the washi...

Embodiment 1

[0035] at 4m 3 In the reactor of , first add 2.1m 3 water, then add 1.0m 3 of water glass solution (2.53mol / L) and 0.075m 3 The concentrated sulfuric acid was reacted at 84 ° C for 100 min, and the white carbon black synthesis solution was obtained after cooling. The silica synthesis liquid was filtered to obtain a silica slurry material, and the content of sodium sulfate was 2.78 wt% in sampling and analysis. Then, according to the requirement that the content of sodium sulfate in the product was 0.9 wt%, 5 m 3 40°C hot water, fully stirred and then dehydrated and concentrated, the sodium sulfate content in the concentrated slurry was measured to be 0.95wt%; 0.13 m of the concentrated slurry was added 3 The hot water at 40°C is fully stirred and then dehydrated and concentrated. The sodium sulfate content after the secondary concentrated slurry is measured to be 0.9wt%; the total amount of washing water is 5.13 m 3 ; The secondary concentrated slurry is transferred to a...

Embodiment 2

[0038] at 4m 3 In the reactor of , first add 2.1m 3 water, then add 1.0m 3 of water glass solution (2.53mol / L) and 0.075m 3 The concentrated sulfuric acid was reacted at 84 ° C for 100 min, and the white carbon black synthesis solution was obtained after cooling. The silica synthesis liquid was filtered by membrane to obtain silica slurry material, and the content of sodium sulfate was 2.86 wt% in sampling and analysis. 3 40 ℃ hot water, fully stirred and then dehydrated and concentrated, the sodium sulfate content in the concentrated slurry was measured to be 0.56wt%; 0.9 m of the concentrated slurry was added 3 The hot water at 40°C is fully stirred and then dehydrated and concentrated for the second time, and the sodium sulfate content after the measurement of the secondary concentrated slurry is 0.5 wt%; Silica S2 is obtained.

[0039] The specific surface area of ​​the silica S1 is 190m 2 / g, the oil absorption rate DBP is 2.42cm 3 / g, the sodium sulfate content ...

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Abstract

The invention provides a preparation method of white carbon black. The preparation comprises the following steps: S1, white carbon black synthesis, wherein sodium silicate solution and concentrated sulfuric acid are mixed to react to prepare white carbon black synthesized liquid; S2, coarse filter of white carbon black, wherein the white carbon black synthesized liquid is dehydrated for the first time by virtue of membrane filtration to obtain a white carbon black slurry material, the white carbon black slurry material is sampled to analyze the content of sodium sulfate; S3, white carbon black washing, wherein a proper amount of washing water at a proper temperature is added for washing according to the content of sodium sulfate obtained in the step S2, the washed material is concentrated and filtered, and the content of sodium sulfate in the concentrated and filtered material is measured; and S4, the step S3 is repeated until the content of sodium sulfate in the concentrated and filtered material is between 0.2wt% and 1.7wt% and reaches the product requirement, and then the concentrated and filtered material is dried to obtain the white carbon black product. According to the preparation method provided by the invention, the washing water amount can be effectively reduced and the complete washing can be ensured, so that white carbon black products of various specifications which are different in content of sodium sulfate can be prepared.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a preparation method of white carbon black and the white carbon black prepared by the preparation method. Background technique [0002] Silica is also known as hydrated silica. At present, the conventional production methods mainly include gas phase method and precipitation method. Among them, silica is mainly used as reinforcing agent for silicone rubber, coating and unsaturated, resin thickener, reinforcing agent for natural rubber and synthetic rubber, toothpaste friction agent, etc. [0003] The precipitation method refers to the use of sulfuric acid, hydrochloric acid, CO 2 With water glass as the basic raw material to produce silicon dioxide; the production process of the precipitation method is mainly produced by using sulfuric acid and water glass as raw materials, and the silica synthesis solution obtained after the reaction is a mixed system of silicon diox...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 周敏唐建强唐志凡彭令军唐任志张洁
Owner ZHUZHOU XINGLONG CHEM IND
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