System for treating tail gas produced by white carbon black production by gas phase method

Abstract

The invention relates to a system for treating tail gas produced by white carbon black production by a gas phase method. The system comprises a washing tower, a falling-film tower, a first hydrochloric acid washing tower, a second hydrochloric acid washing tower, an alkaline washing tower, an acidification tower, a neutralizing tower and a fluidized bed dryer, wherein an inlet for white carbon black powder byproduct mixed gas is formed in the lower part of the washing tower; a washing spraying device is arranged in the washing tower; a washing liquid outlet is formed in the bottom of the washing tower; a washing liquid inlet is formed in the upper part of the washing tower; a washing tower gas outlet is formed in the top of the washing tower; the washing liquid outlet is connected with a first circulating water pump connected to the washing liquid inlet. According to the system for treating the tail gas produced by white carbon black production by the vapor phase method, the problem that the system resistance is increased as equipment is blocked by white carbon black in a white carbon black tail gas treatment technology is solved; the temperature of tail gas entering the falling-film tower is greatly reduced to be less than 50 DEG C, and the influence, which is caused by high temperature, on the falling-film tower is avoided.

Description

technical field [0001] The invention relates to a tail gas treatment system for producing white carbon black by a gas phase method. Background technique [0002] Fumed silica, commonly known as fumed white carbon black, has a small particle size (7~40nm) and a large specific surface area (50-400m 2 / g), high product purity (SiO 2 ≥99.8%), divided into hydrophilic and hydrophobic products. As an important nano-scale inorganic chemical raw material, this product has excellent surface chemical properties and good physiological inertia, and is widely used in silicone rubber, adhesives, paints, coatings, inks, paper, cosmetics, medicine, food and other fields. It is an indispensable raw material for high-tech fields and defense industry. Its average annual growth rate is as high as ten percent, and its products have a bright future, which belongs to the sunrise industry. [0003] The tail gas (mainly composed of hydrogen chloride, chlorine and white carbon black dust) produce...

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Problems solved by technology

[0004] 1. The white carbon black in the tail gas is easy to block the tubes of the falling film tower, and the white carbon black that cannot settle in the tubes enters the absorption tower, which will easily cause plugging of the packing holes and make the production unable to run continuously for a long time;

[0005] 2. The tail gas temperature of gas-phase silica is relatively high (generally above 200°C), and it directly enters the falling film tower, which not only affects the absorption of hydrogen chloride, but also affects the service life of the falling film tower

However, due to the high maintenance cost of the Venturi tube, it is not conducive to reducing production costs

In addition, although the production of hydrochloric acid has been recycled, the final treatment of hydrochloric acid has not been effectively solved.

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