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Oxidation absorption method for converting high-concentration dinitrogen tetroxide waste gas into potassium fertilizer

A technology of dinitrogen tetroxide and oxidation absorption, applied in chemical instruments and methods, potash fertilizers, separation methods, etc., to achieve significant environmental benefits, create economic benefits, and offset treatment costs

Inactive Publication Date: 2014-07-16
LANZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As far as the applicant knows: the absorption technology that can treat more than 60% of high-concentration dinitrogen tetroxide waste gas into potassium fertilizer, so that the content of nitrogen oxides and nitrite in the tail gas can reach the national emission standards, has not been reported yet

Method used

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  • Oxidation absorption method for converting high-concentration dinitrogen tetroxide waste gas into potassium fertilizer
  • Oxidation absorption method for converting high-concentration dinitrogen tetroxide waste gas into potassium fertilizer
  • Oxidation absorption method for converting high-concentration dinitrogen tetroxide waste gas into potassium fertilizer

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Embodiment Construction

[0028] Such as figure 1 Shown: a device for the harmless treatment of high-concentration dinitrogen tetroxide waste gas, including a primary absorption tower 7, a secondary absorption tower 15, and a tertiary absorption tower 20; the tops of the absorption towers are connected with intake pipes and the absorption liquid inlet pipe; that is, the top of the primary absorption tower 7 is provided with a primary air inlet pipeline and a primary absorption liquid inlet pipe 4, and the top of the secondary absorption tower 15 is provided with a primary tail gas pipe 14 and a secondary absorption liquid inlet pipe 17. The top of the third-stage absorption tower 20 is provided with a second-stage tail gas pipe 19 connected to the second-stage absorption tower and a third-stage absorption liquid inlet pipe 23; 2 o 4 The exhaust gas source 11 is connected, the intake pipeline 14 of the secondary absorption tower is connected with the primary absorption tower 7, the intake pipeline 19 o...

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Abstract

The invention relates to an oxidation absorption method for converting high-concentration dinitrogen tetroxide waste gas into potassium fertilizer. The method comprises the following steps of oxidizing and absorbing the dinitrogen tetroixde waste gas with the molar content of 20 to 70 percent collectively through two levels of dilute nitric acid HNO3 and hydrogen peroxide H2O2 to obtain nitric acid, and then converting the nitric acid into potassium fertilizer by utilizing potassium hydroxide KOH alkali liquid. The method can be applied to the working condition that the waste gas pressure, concentration and flow rate are continuously varied, the absorption heat can be radiated in time by adopting large liquid spraying quantity and a kettle liquid cooling method, and a purpose of controlling the temperature can be realized. By adopting the oxidation absorption method, the technical bottle necks of rapidly oxidizing NO, reducing the contents of nitrous acid and nitrite and absorbing and radiating the heat can be broken through. The high-concentration dinitrogen tetroxide waste gas can be absorbed, the emission of toxic acid gas can be reduced, the air pollution can be prevented, and the environmental protection benefit is remarkable. The dinitrogen tetroxide waste gas is converted into the potassium fertilizer, so that waste is changed into treasure, the economic benefit is increased, the processing cost can be offset, and a novel way is provided for processing the tail gas of the nitric acid industry.

Description

technical field [0001] The invention relates to a nitrogen oxide waste gas treatment method, in particular to an oxidation absorption method for converting high-concentration dinitrogen tetroxide waste gas into potassium fertilizer. Background technique [0002] At the spaceport, dinitrogen tetroxide (N 2 o 4 ) liquid volatilizes into gaseous dinitrogen tetroxide (N 2 o 4 ), nitrogen dioxide (NO 2 ) and nitrogen (N 2 ), these exhaust gases need to be discharged from storage tanks and equipment, and the emissions form highly toxic yellow smoke in the air, seriously polluting the atmosphere and causing great harm to the environment and human health. Therefore, there is a need for a technology for treating waste gas of dinitrogen tetroxide, which can timely convert the waste gas into environmentally friendly substances for reuse. At present, the treatment methods of nitrogen oxide exhaust gas widely used at home and abroad can be divided into two categories: dry method an...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/56B01D53/73C05D1/00
Inventor 常彦龙焦天恕黄凌志张海军张立清赵冰郭跃萍张俊旺郑宇凡
Owner LANZHOU UNIVERSITY
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