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Process and equipment for recycling HCl in fumed silica production

A technology of fumed silica and recovery equipment, applied in the direction of chlorine/hydrogen chloride, etc., can solve the problems of easy blockage of falling film tower tubes, damage of absorption equipment, and influence on normal production, etc., achieve high purity, reduce waste, and expand recovery methods Effect

Active Publication Date: 2015-01-28
赤峰盛森硅业科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The high temperature of the exhaust gas not only causes damage to the absorption equipment, but also poses a safety hazard
At the same time, the tail gas is directly passed into the falling film tower, and the fumed silica in the tail gas is easy to block the tubes of the falling film tower, affecting normal production

Method used

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  • Process and equipment for recycling HCl in fumed silica production
  • Process and equipment for recycling HCl in fumed silica production
  • Process and equipment for recycling HCl in fumed silica production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] like figure 2 As shown, the main equipment of the HCl recovery process in the production of fumed silica includes: Venturi absorber 1, Venturi absorption tank 2, acid separator 3, acid absorption tower 4, pickling tower 5, and acid storage tank 6.

[0044] The air inlet of Venturi absorber 1 is connected to gas-phase silica tail gas main pipe, and the gas outlet is connected to acid separator 3; the gas outlet of acid separator 3 is connected to the top of acid absorption tower 4, and the gas-liquid mixed phase outlet of acid absorption tower 4 is connected to acid storage Tank 6, the gas outlet of acid storage tank 6 is connected to the bottom of pickling tower 5, and the tail gas after recovering HCl is discharged into the next-stage tail gas treatment system through the top of pickling tower 5.

[0045] The liquid phase outlets of the Venturi absorber 1 and the acid separator 3 are all connected to the Venturi absorption tank 2, and the Venturi absorption tank 2 is ...

Embodiment 2

[0057] In order to obtain high-purity HCl, on the basis of the recovery equipment in Example 1, the HCl recovery equipment in the production of fumed silica also includes: a desorption tower 8, a reboiler 9, a heat exchanger 10, a heat exchanger 11, and an acid separator 12, acid separator 13, acid separator 14 and filter press 15.

[0058] The acid storage tank 6 is also provided with two acid liquid outlets, one is the acid liquid product outlet, leading to the acid liquid storage tank; the other is connected with the acid pump, leading to the desorption tower 8 for further processing.

[0059] The pickling tower 5 is provided with two spraying devices, the top of the tower is a spraying device for steam condensed water, and the upper middle part of the tower is a spraying device for a low-concentration acid solution, which comes from the bottom of the analysis tower 8 . The steam condensed water spraying device 5-1 is arranged above the acid liquid spraying device 5-2. The...

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Abstract

The invention discloses a process and device for recycling HCl in fumed silica production in the technical field of HCl recycling in the fumed silica production. Tail gas is introduced into a system, and HCl is recycled by virtue of equipment such as a Venturi absorber, an acid separator, an acid absorption tower, an acid washing tower and an analysis tower. HCl in the tail gas is fully recycled, waste of resource is reduced, difficulty of follow-up tail gas treatment is reduced, and an HCl recycling method in the fumed silica production is also expanded. Purity of the HCl recycled by adopting the process disclosed by the invention is high, and the process disclosed by the invention has higher economic value.

Description

technical field [0001] The invention belongs to the technical field of HCl recovery in the production of gas-phase silica, and in particular relates to a process and equipment for recovering HCl in the production of gas-phase silica. Background technique [0002] Fumed silica is also called fumed white carbon black. The intake air in the process of producing fumed silica includes fumed silane halides, hydrogen and purified air. The gas phase silane halide undergoes hydrolysis reaction in the high temperature oxyhydrogen flame generated by hydrogen combustion. The reaction equation is: [0003] SiCl 4 +2H 2 +O 2 → SiO 2 +4HCl [0004] CH 3 SiCl 3 +2H 2 +3O 2 → SiO 2 +CO 2 +3HCl+2H 2 o [0005] Due to the high reaction temperature, side reactions may also occur, producing Cl 2 Wait for gas. [0006] It can be seen that in the production of fumed silica, the tail gas contains O 2 、H 2 O, SiO 2 , HCl, Cl 2 and CO 2 and other gases, at the same time, there is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/01
Inventor 马公林艾俊峰赵春宇
Owner 赤峰盛森硅业科技发展有限公司