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Device and method for separating hydrogen chloride from tail gas of fumed silica production

A technology of gas-phase silica and hydrogen chloride, which is applied in the direction of separation methods, chemical instruments and methods, chlorine/hydrogen chloride, etc., can solve problems such as low concentration of hydrochloric acid, low external sales price, and influence on the normal operation of gas-phase silica devices, and achieve The effect of high added value and high purity

Inactive Publication Date: 2018-12-04
XINTE ENERGY
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Problems solved by technology

[0003] In the tail gas treatment part, hydrogen chloride gas is absorbed by water to produce a large amount of hydrochloric acid. The concentration of hydrochloric acid in this part is relatively low, generally 22-26%. The impact is relatively large, and hydrochloric acid is basically unable to be sold outside in winter, which affects the normal operation of the fumed silica plant

Method used

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  • Device and method for separating hydrogen chloride from tail gas of fumed silica production

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Embodiment 1

[0038] Such as figure 1 As shown, this embodiment provides a device for separating hydrogen chloride from exhaust gas from gas-phase white carbon black production, including:

[0039] The concentrated acid absorption tower 1 is used to use the first absorption liquid concentrated hydrochloric acid to rinse the gas-phase white carbon black production tail gas passed into the concentrated acid absorption tower 1 to obtain the first tail gas that has been treated by the concentrated acid absorption tower 1; Gas-phase white carbon black production tail gas includes: hydrogen chloride, chlorine, nitrogen, oxygen;

[0040] It should be noted that the device for separating hydrogen chloride from the gas-phase white carbon black production tail gas in this embodiment also includes: a concentrated acid buffer tank 2, which is connected to the bottom of the concentrated acid absorption tower 1, and the concentrated acid buffer tank 2 is used for buffering The bottom liquid of concentrated a...

Embodiment 2

[0057] Such as figure 1 As shown, this embodiment provides a method for separating hydrogen chloride from gas-phase white carbon black production tail gas using the device in embodiment 1, which includes the following steps:

[0058] (1) Pass the gas-phase white carbon black production tail gas containing hydrogen chloride, chlorine, nitrogen, and oxygen to the bottom of the concentrated acid absorption tower 1, and the first absorption liquid concentrated hydrochloric acid with a mass percentage concentration of 24-27% in the concentrated acid absorption tower 1. Gas-liquid contact in the packing layer, the temperature is controlled at 30~45℃, the flow rate of the first absorption liquid concentrated hydrochloric acid is controlled at 6~10m 3 / h, the first tail gas processed by the concentrated acid absorption tower 1 is obtained. After the first absorption liquid concentrated hydrochloric acid absorbs part of the hydrogen chloride in the gas-phase white carbon black production t...

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Abstract

The invention discloses a device and method for separating hydrogen chloride from tail gas of fumed silica production. The device comprises a concentrated acid absorption tower, a dilute acid absorption tower, an alkali absorption tower and a hydrochloric acid analysis tower. An absorption and analysis cycle system is constituted by the concentrated acid absorption tower, the dilute acid absorption tower and the hydrochloric acid analysis tower in the device; hydrogen chloride gas in fumed silica is separated out through the absorption and analysis cycle system. The device and method have thefollowing beneficial effects that all hydrogen chloride in the fumed silica tail gas can be separated and recovered without production of hydrochloric acid with low added value; high-concentration hydrochloric acid with the mass percentage concentration of 37%-40% can be produced; and the recovered hydrogen chloride has high purity and the volume content can reach 99.9%.

Description

Technical field [0001] The invention belongs to the technical field of polysilicon production, and specifically relates to a device and a method for separating hydrogen chloride from exhaust gas from gas-phase white carbon black production. Background technique [0002] Fumed white carbon black is a kind of nano-scale powder material with wide application. Its production process is to use chlorosilane to obtain nano-scale silica powder through hydrogen-oxygen flame high temperature hydrolysis. Since this production process uses chlorosilane, hydrogen and air as raw materials, a part of the tail gas will be produced after the synthesis of gas-phase white carbon black, which is mainly composed of nitrogen, oxygen, water vapor, hydrogen chloride and chlorine. Among them, hydrogen chloride and chlorine are poisonous and harmful gases. Direct discharge. There is a multi-stage tail gas absorption tower in the gas-phase white carbon black production device, which is used to treat the c...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/68C01B7/07
CPCB01D53/1412B01D53/1418B01D53/1425B01D53/1456B01D53/68B01D53/78B01D2257/2045C01B7/0706C01P2006/80
Inventor 胡光健许鹏黄鹏包全星杨涛杜新
Owner XINTE ENERGY
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