Dilute nitric acid preparing method meeting requirements of energy saving and emission reduction as well as low cost and device

A technology of dilute nitric acid and nitric acid, applied in the direction of nitric acid, separation methods, chemical instruments and methods, etc., can solve problems such as environmental pollution, achieve the effects of convenient operation, simple structure, and reduced cost of acid preparation

Inactive Publication Date: 2012-08-22
ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the industrial dilute nitric acid prepared in the market produces a large amount of nitrogen oxide gas during the preparation process, which causes great pollution to the environment.

Method used

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  • Dilute nitric acid preparing method meeting requirements of energy saving and emission reduction as well as low cost and device
  • Dilute nitric acid preparing method meeting requirements of energy saving and emission reduction as well as low cost and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (To use 98% concentrated nitric acid and 58% dilute nitric acid to prepare 100m 3 , the concentration is 68% dilute nitric acid as an example, specifically explaining the method for preparing dilute nitric acid in an environment-friendly manner. )

[0019] Such as figure 1 as shown,

[0020] 1. According to the volume ratio of concentrated nitric acid and dilute nitric acid 1:2.8711, measure through the flow meter FI1, 74.1675m of 58% dilute acid 3 Inject the stainless steel acid tank 30, open the dilute acid pump 35, circulate the 58% dilute nitric acid in the stainless steel acid tank 30, and release the undissolved part nitrogen oxide gas from the dilute nitric acid;

[0021] 2. Lead the process soft water into the liquid distribution pipe on the tower tail water tank 22 and maintain the liquid level of the tower tail water tank 22 at 30%~50%;

[0022] 3. According to the volume ratio of concentrated nitric acid and dilute nitric acid 1: 2.8711, measure through f...

Embodiment 2

[0027] (to use 98% concentrated nitric acid and the dilute nitric acid preparation 100m of the 1-3% that the tower tail tank 22 of embodiment 1 obtains 3 , the concentration is 68% dilute nitric acid as an example, specifically explaining the method for preparing dilute nitric acid in an environment-friendly manner. )

[0028] Such as figure 1 Shown:

[0029] 1. Turn on the special injection acid pump 25, according to the volume ratio of concentrated nitric acid and dilute nitric acid 1.7526:1, through the flow meter FI3, dilute nitric acid from the tower tail tank 22 with a concentration of 1% to 3% is injected into the stainless steel acid tank 30. When the flow meter FI3 measurement shows 36.3293m 3 , keep the indication on the vacuum gauge P1 on the outlet pipe of the acid pump 26 as 80-90Kpa, so as to remove the uncombined nitrogen oxides in the stainless steel dilute acid tank 30. Turn on the dilute acid pump 35 to circulate the 1% to 3% dilute nitric acid in the sta...

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Abstract

The invention discloses a dilute nitric acid preparing method meeting the requirements of energy saving and emission reduction as well as low cost and a device. The method comprises the steps of adding the high-concentration nitric acid into the low-concentration nitric acid for intensive mixing by circulating reflux, blowing compressed air into the mixed nitric acid, extracting undissolved nitric oxide gas until the mixed nitric acid reaches the required concentration of dilute nitric acid, stopping reflux, stopping introducing the compressed air, and sending the undissolved nitric oxide gasto a water tank to be absorbed by water to form a nitric acid solution. The dilute nitric acid preparing method adopts a mode of air stripping of ascending compressed air flow and descending recycledacid countercurrent so as to avoid the discharge of a large number of waste water and waste gas in the acid preparation process and effectively reduce the cost for acid preparation. The dilute acid preparation device of the invention has simple structure and is operated conveniently. The invention protects the environment, saves energy, has obvious economic and environmental benefits, and has popularization value when preparing the industrial dilute nitric acid.

Description

technical field [0001] The invention relates to a method for preparing dilute nitric acid, in particular to a method for preparing dilute nitric acid in line with energy saving, emission reduction and low cost, and a device for realizing the method. Background technique [0002] Industrial dilute nitric acid is widely used in important fields such as chemical fertilizers, organic chemicals, military industry, medicine, non-ferrous metals, IT industry and atomic energy. However, the industrial dilute nitric acid prepared in the market produces a large amount of nitrogen oxide gas during the preparation process, which causes great pollution to the environment. In recent years, with the promulgation and implementation of new national environmental protection regulations and the implementation of energy conservation and emission reduction regulations, there is an urgent need for a method for preparing dilute nitric acid that meets energy conservation and emission reduction and l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/40B01D53/18
Inventor 孙爱鸿吴明春
Owner ANHUI WANBEI COAL REFCO GRP LTD HANSHAN HENGTAI NONMETALLIC MATERIALS BRANCH
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