Device and method for recovering gas of nitrogen oxides in production process of nitro-cotton

A production process and recovery device technology, applied in chemical instruments and methods, separation methods, nitric acid, etc., can solve the problems of low concentration of dilute nitric acid, large amount of dilute nitric acid, single nitric acid user, etc., to improve economic benefits and meet sales needs , to ensure the effect of normal operation

Inactive Publication Date: 2016-02-17
SICHUAN NITROCELLULOSE CORP
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Problems solved by technology

The Chinese patent with the application number 201210512696.7 discloses a treatment method for nitrogen oxide waste gas. The method includes pickling unit, water washing unit and alkali washing unit, and the waste gas emission can be achieved through step-by-step absorption; but in the alkali washing unit, there will be Industrial waste salt causes secondary pollution and low recovery rate of nitric acid; due to the large amount of gunpowder smoke generated in the production process of nitrocellulose, a large amount of dilute nitric acid is generated, and the concentration of dilute nitric acid obtained by this method is low, and the nitric acid user is single, so it is difficult to take out , affecting the normal operation of gunpowder recovery and reducing the economic benefits of nitrocellulose production

Method used

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  • Device and method for recovering gas of nitrogen oxides in production process of nitro-cotton

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Experimental program
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Effect test

Embodiment 1

[0030] like figure 1 as shown in figure 1 The structure diagram of the gunpowder smoke recovery device in the shown nitrocellulose production process of the present invention, the gunpowder smoke recovery device in the nitrocellulose production process includes: the first absorption unit 1, the second absorption unit 2, the third absorption unit 3, exhaust fan 4 and The first hydrometer 5, the second hydrometer 6; the first absorption unit 1 includes the absorption tower 1a that the absorbent is water; the second absorption unit 2 includes 4 series-connected absorption towers 2a that the absorbent is water, It is arranged at the post station of the first absorption unit 1 and is connected in series with it; the third absorption unit 3 includes up to two absorption towers 3a whose absorbent is a mixed solution of urea and hydrogen peroxide, and is arranged at the post station of the second absorption unit 2 and connected with it. in series.

[0031] The bottom of the water wash...

Embodiment 2

[0048] In the nitrocellulose production process provided by the present invention, the gunpowder smoke recovery device is as embodiment 1, and the recovery method comprises the following steps:

[0049] (1) Close and open the valve on the connecting pipeline between the first absorption unit 1 and the second absorption unit 2 absorption tower, and the upper water inlet 9 of the last absorption tower circulation pump 7 of the second absorption unit 2 flows into the absorption tower of the second absorption unit 2 Add water, the water flows back to the first absorption unit 1, after the liquid level of the washing absorption tower 1a reaches 10-30%, close the valve on the connecting pipeline of the first absorption unit 1 and the second absorption unit 2 absorption tower, start the circulation pump 7, Water circulates from top to bottom in the absorption tower;

[0050] (2) Treat that the liquid level of each absorption tower of the second absorption unit 2 reaches 10-30%, start...

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Abstract

The invention relates to the field of treatment of waste gas generated in the production of nitro-cotton, aims to provide a device and a method for recovering gas of nitrogen oxides in the production process of nitro-cotton. The device comprises a first absorption unit, a second absorption unit, a third absorption unit, an exhaust fan, a first hydrometer and a second hydrometer, wherein the first absorption unit comprises a water washing absorption tower; the second absorption unit comprises at least two water washing absorption towers connected in series, is arranged at a station behind the first absorption unit and is connected with the first absorption unit in series; the third absorption unit comprises at least one absorption tower with a urea and hydrogen peroxide mixed solution as an absorbent, is arranged at a station behind the second absorption unit and is connected with the second absorption unit in series; an outlet for 60% nitric acid is formed behind the first hydrometer, and an outlet for 30% nitric acid is formed behind the second hydrometer; multi-stage water washing treatment and urea and hydrogen peroxide treatment are adopted, secondary pollution cannot be caused in the whole treatment process, nitric acid with two kinds of concentration can be provided simultaneously, users of nitric acid are increased, normal operation of a recovery system for the gas of nitrogen oxides is guaranteed, and the economic efficiency of recovery of the gas of nitrogen oxides is improved.

Description

technical field [0001] The invention relates to the field of waste gas treatment of nitrocellulose production, in particular to a treatment method for gunpowder smoke in the production process of nitrocellulose. Background technique [0002] Cellulose nitrate, commonly known as nitrocellulose or nitrocellulose, is the product of the reaction between cellulose and nitric acid, and its molecular formula is C 6 h 7 o 2 (ONO 2 ) a (OH) 3-an , where a is the degree of esterification and n is the degree of polymerization. Nitrocellulose was originally used in the military field as an important raw material for the manufacture of propellants, missiles, and rocket propellants; with the development of science and technology, the application range of nitrocellulose is no longer limited to military products, and is reflected in all aspects of daily life, such as Automobile paint, solid alcohol and adhesives for electronic products, etc. [0003] At present, the preparation proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56C01B21/38
Inventor 熊仕明王维智邱清海朱华
Owner SICHUAN NITROCELLULOSE CORP
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