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Circulation novel process for preparing white carbon black

A technology of white carbon black and new process, which is applied in the field of new circular process for preparing white carbon black, can solve the problems of environmental pollution, consumption of large energy, protection of unfavorable ecological environment, etc., and achieves high utilization rate, reduction of production cost, improvement of The effect of recycling value

Inactive Publication Date: 2008-12-17
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] White carbon black is an inorganic fine chemical product with a wide range of uses. The traditional production method is to use water glass as raw material to carry out double decomposition reaction with sulfuric acid or hydrochloric acid. A large amount of sodium sulfate or sodium chloride aqueous solution will consume a lot of energy to recycle such low-concentration substances. If they are not recycled and discharged outside, they will definitely cause serious pollution to the environment or be detrimental to the protection of the ecological environment.
This traditional production method has great technical defects not only for enterprises but also for the country and society.

Method used

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  • Circulation novel process for preparing white carbon black

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 Add 300ml of water glass with a modulus of 3.2 to a dilute solution of 10°Be' after purification and add it to a 1000ml stirred reactor, keep the reaction material at 45°C, and add 20g of refined NH 4 HCO 3 , so that it undergoes the following reaction: Na 2 O mSiO 2 +2NH 4 HCO 3 =2NaHCO 3 +mSiO 2 ·nH 2 O↓+2NH 3 ↑+(1-mn)H 2 O, where water glass solution and NH 4 HCO 3 The molar ratio is controlled at 1:2.0~1:2.2 (among which 3.1<m<3.4), after 45-60 minutes of reaction, the gas escaping from the top of the reactor can not smell ammonia smell (it can be checked by wet test paper), then the reaction is over , to obtain loose precipitated silica.

[0019] The precipitate that above-mentioned reaction is made is filtered under vacuum condition, obtains filter cake first and mother liquor first, after initial mother liquor first evaporates 1 / 3 moisture through vacuum low temperature, the mass concentration that makes sodium bicarbonate in mother l...

Embodiment 2

[0022] Such as figure 1 Add 300ml of water glass with a modulus of 3.2 to a 9°Be′ dilute solution after purification and add it to a 1000ml stirred reactor, keep the reaction material at 30°C, and add 19g of refined NH 4 HCO 3 , so that it undergoes the following reaction: Na 2 O mSiO 2 +2NH 4 HCO 3 =2NaHCO 3 +mSiO 2 ·nH 2 O↓+2NH 3 ↑+(1-mn)H 2 O, where water glass solution and NH 4 HCO 3 The molar ratio is controlled at 1:2.0~1:2.2 (among which 3.1<m<3.4), after 45-60 minutes of reaction, the gas escaping from the top of the reactor can not smell ammonia smell (it can be checked by wet test paper), then the reaction is over , to obtain loose precipitated silica.

[0023] The precipitate that above-mentioned reaction is made is filtered under vacuum condition, obtains filter cake first and mother liquor first, after initial mother liquor first evaporates 1 / 3 moisture through vacuum low temperature, the mass concentration that makes sodium bicarbonate in mother liquo...

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Abstract

The invention relates to a new cycle technique for preparing white carbon black, comprising the following steps: 1) a water glass solution reacts with an ammonium hydrogen carbonate solution or solid ammonium hydrogen carbonate in the condition of the temperature of 30 to 50 DEG C, the white carbon black is obtained and ammonia escapes simultaneously; 2) the ammonia escaped from the step 1) is mixed with CO2 gas produced in the process of the preparation of the water glass solution and the obtained mixture is absorbed by water to obtain the ammonium hydrogen carbonate; 3) the white carbon black produced by reaction is filtered under the condition of vacuum to obtain a mother liquid A and a filter cake A, the mother liquid A is recovered and the filter cake A is washed, dried and crushed so as to obtain the white carbon black. The invention 1) solves the effective recovery of by-products in the production process, is used for self-production, improves the utilization value of materials, without three wastes discharge in the production process, and has high material utilization rate, good effect of discharge reduction and stable and reliable quality of products; 2) recovery of sodium bicarbonate is carried out after the mass concentration is increased by the evaporation in vacuum at low temperature, thus reducing the usage of organic solvent.

Description

technical field [0001] The invention relates to a new recycling process for preparing white carbon black. Background technique [0002] White carbon black is an inorganic fine chemical product with a wide range of uses. The traditional production method is to use water glass as raw material to carry out metathesis reaction with sulfuric acid or hydrochloric acid to produce it. During this process, low concentration, liquid A large amount of sodium sulfate or sodium chloride aqueous solution will consume a large amount of energy to reclaim such low-concentration substances. If it is not recycled and discharged, it will definitely cause serious pollution to the environment or be unfavorable for the protection of the ecological environment. This traditional production method has great technical defects both to the enterprise and to the country and society. Contents of the invention [0003] The problem to be solved by the present invention is to propose a new recycling proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 徐旺生郭嘉刘芳赵彬王慧龙文露舒琼
Owner WUHAN INSTITUTE OF TECHNOLOGY
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