CN103112835A - Indirect bleaching method in concentrated nitric acid production process - Google Patents
Indirect bleaching method in concentrated nitric acid production process Download PDFInfo
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- CN103112835A CN103112835A CN2012104466622A CN201210446662A CN103112835A CN 103112835 A CN103112835 A CN 103112835A CN 2012104466622 A CN2012104466622 A CN 2012104466622A CN 201210446662 A CN201210446662 A CN 201210446662A CN 103112835 A CN103112835 A CN 103112835A
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- nitric acid
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- bleaching
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Abstract
The invention provides an indirect bleaching method in a concentrated nitric acid production process, which comprises the following steps: a. using absorption tower outlet process gas in a dilute nitric acid production process as concentrated nitric acid bleaching gas, wherein the pressure is controlled at 0.8 MPa, and the temperature is not higher than 60 DEG C; and b. introducing the bleaching gas in the step a into the bottom of a concentrated nitric acid bleaching tower, feeding the concentrated nitric acid from the tower top while keeping the negative pressure of the tower top at not lower than -50 KPa, recycling the gas through a water injector, and directly recovering the concentrated nitric acid. The method provided by the invention utilizes the process gas, the proportion of the partial pressure of water in which is very small, in the dilute nitric acid production process as the bleaching gas, so that no additional water can be introduced; and the gas temperature is controllable, so the finished product concentrated nitric acid can not be decomposed, thereby enhancing the quality of the concentrated nitric acid product and lowering the energy consumption of the system.
Description
Technical field
The present invention relates to the nitric acid preparation method in chemical production field, particularly a kind of bleaching method of concentrated nitric acid.
Background technology
In concentrated nitric acid production at present, bleaching method has two kinds, i.e. cold process denitration and Re Fa denitration (" nitric acid production and operation ", Jing Shuanwu, Chen Xiaoqin work, 1994).
The cold process denitration is the air denitration, to utilize air to resolve the nitrogen oxide that is dissolved in nitric acid, bringing a certain amount of moisture (wet air) into air in the air denitration is diluted nitric acid, particularly southern atmospheric moisture is larger, bring in nitric acid moisture into air more, so the narrower north that is useful in of air denitration applicability, and the low temperature concentrated nitric acid can become N2O by superposition
4, i.e. 2NO
2=N
2O
4
Hot method denitration utilizes the nitrogen oxide in rectifying nitric acid vapor parsing nitric acid out, and under high-temperature, nitric acid can generate NO
2, but hot method flow process is longer, and pressure reduction is large, operation inconvenience, energy consumption is higher.
4HNO
3=2H
2O+4NO
2+O
2。
Summary of the invention
Purpose of the present invention is exactly the defective that exists in order to overcome existing bleaching technology, and the bleaching method in a kind of indirect method concentrated nitric acid production process is provided, and improves the concentrated nitric acid product quality, reduces system energy consumption.
The technical solution used in the present invention is as follows:
Indirect bleaching method in a kind of concentrated nitric acid production process comprises the following steps:
A, the absorption tower in dilute nitric acid production process outlet process gas, control pressure 0.8MPa, temperature is higher than 60 degree, as concentrated nitric acid bleaching gas,
B, bleaching gas in step a is introduced concentrated nitric acid bleaching tower bottom, concentrated nitric acid enters from tower top, keeps the tower top negative pressure and is not less than-50KPa, and bleaching gas reclaims through water-jet exhauster, the direct extraction of concentrated nitric acid.
In technique scheme, the pressure of bleaching gas and temperature must strictly be controlled, and the bleaching gaseous tension is the important indicator of moisture in gas, and bleaching gas is controlled at and is not less than 0.8MPa.NO in the low concentrated nitric acid of bleaching gas temperature
2Can fall and close, the high concentrated nitric acid of temperature can decompose.First control process gas 0.8MPa, temperature 20 degree in operation, then control outlet temperature 40～45 degree through interchanger.
The control of bleaching tower negative pressure in technique scheme.The low bleaching gas volume that sucks of negative pressure is little, and denitration effect is poor, and the bleaching gas volume of the large suction of negative pressure is large, and denitration effect is relatively better, but has entrainment, and suitable tower top negative pressure is the guarantee of product quality.Therefore control tower top negative pressure general control-5～-30KPa, optimum range-10～-15KPa.
Adopt method of the present invention, its product quality is better than national standard.Utilize the process gas in the dilute nitric acid production process, compressed, the condensation of its process gas itself.In gas, moisture covers very small proportion, as bleaching gas, can extra band not enter moisture, and gas temperature is controlled with it, the finished product concentrated nitric acid is produced decompose, and improves the concentrated nitric acid product quality, reduces system energy consumption.
Embodiment:
1, adopt the nitric acid concentration tower of 1 meter of diameter, the concentrated nitric acid bleaching tower that diameter is 0.8 meter, the concentrated nitric acid interchanger of 200 squares.
2, nitric acid concentration tower is per hour thrown 3.0 cubes, rare nitric acid, and upgrading tower tower top temperature 84.5 degree are controlled rare nitric acid process gas 0.81MPa, temperature 20.5 degree.Rare nitric acid process gas decompression is controlled temperature 42 degree by the interchanger heat exchange, is bleaching gas.
3, at concentrated nitric acid bleaching tower top, water-jet exhauster is set, is used for to bleach gas recovery.Bleaching gas is introduced from concentrated nitric acid bleaching tower bottom, and concentrated nitric acid enters from the bleaching tower jacking, by adjusting injector hydraulic pressure, controls bleaching tower top negative pressure at-11KPa.The direct extraction of concentrated nitric acid, extraction finished product concentrated nitric acid sampling analysis, concentrated nitric acid content 98.58%, nitrous acid content 0.07%.
Claims (4)
1. the indirect bleaching method in a concentrated nitric acid production process, comprise the following steps:
A, the absorption tower in dilute nitric acid production process outlet process gas, control pressure is not less than 0.8MPa, temperature is higher than 60 degree, as concentrated nitric acid bleaching gas;
B, described bleaching gas is introduced concentrated nitric acid bleaching tower bottom, concentrated nitric acid enters from tower top, keeps the tower top negative pressure and is not less than-50KPa, and bleaching gas reclaims through water-jet exhauster, the direct extraction of concentrated nitric acid.
2. the indirect bleaching method in a kind of concentrated nitric acid production process according to claim 1, is characterized in that bleaching gas temperature and be controlled at 40-45 degree.
3. the indirect bleaching method in a kind of concentrated nitric acid production process according to claim 1 and 2, it is characterized in that bleaching the tower top negative pressure control built in-5～-30KPa.
4. the indirect bleaching method in a kind of concentrated nitric acid production process according to claim 3, it is characterized in that bleaching the tower top negative pressure control built in-10～-15KPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210446662.2A CN103112835B (en) | 2012-11-11 | 2012-11-11 | Indirect bleaching method in concentrated nitric acid production process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210446662.2A CN103112835B (en) | 2012-11-11 | 2012-11-11 | Indirect bleaching method in concentrated nitric acid production process |
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| CN103112835A true CN103112835A (en) | 2013-05-22 |
| CN103112835B CN103112835B (en) | 2014-11-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103523761A (en) * | 2013-10-15 | 2014-01-22 | 苏州市晶协高新电子材料有限公司 | Continuous nitric acid discoloring device and method thereof |
| CN104986743A (en) * | 2015-07-09 | 2015-10-21 | 安徽淮化股份有限公司 | Bleaching process and device used in nitric acid preparation process |
| CN106586985A (en) * | 2015-10-14 | 2017-04-26 | 安徽华尔泰化工股份有限公司 | Concentrated nitrate tail gas recovery apparatus |
| CN113426270A (en) * | 2021-08-10 | 2021-09-24 | 联仕(昆山)化学材料有限公司 | White blowing device and white blowing process for producing electronic-grade nitric acid |
| CN115784179A (en) * | 2022-11-17 | 2023-03-14 | 安徽金禾实业股份有限公司 | Process for co-producing nitric acid with various concentrations through super-azeotropic rectification |
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| GB636951A (en) * | 1947-03-11 | 1950-05-10 | Herman Frischer | Process of and apparatus for the production of nitric acid |
| CN2389147Y (en) * | 1999-09-08 | 2000-07-26 | 中国石油兰州化学工业公司 | Concentrated nitric acid bleaching tower |
| CN1261594A (en) * | 1998-12-24 | 2000-08-02 | 普拉塞尔技术有限公司 | Method for producing nitric acid |
| US6969446B1 (en) * | 2000-05-22 | 2005-11-29 | Qvf Engineering Gmbh | Method for producing concentrated nitric acid and installation for carrying out a method of this type |
| CN101837961A (en) * | 2010-05-25 | 2010-09-22 | 安徽淮化股份有限公司 | Dilute nitric acid preparing method meeting requirements of energy saving and emission reduction as well as low cost and device |
| CN102530893A (en) * | 2012-03-08 | 2012-07-04 | 青岛科技大学 | Nitric acid extraction and concentration method |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB636951A (en) * | 1947-03-11 | 1950-05-10 | Herman Frischer | Process of and apparatus for the production of nitric acid |
| CN1261594A (en) * | 1998-12-24 | 2000-08-02 | 普拉塞尔技术有限公司 | Method for producing nitric acid |
| CN2389147Y (en) * | 1999-09-08 | 2000-07-26 | 中国石油兰州化学工业公司 | Concentrated nitric acid bleaching tower |
| US6969446B1 (en) * | 2000-05-22 | 2005-11-29 | Qvf Engineering Gmbh | Method for producing concentrated nitric acid and installation for carrying out a method of this type |
| CN101837961A (en) * | 2010-05-25 | 2010-09-22 | 安徽淮化股份有限公司 | Dilute nitric acid preparing method meeting requirements of energy saving and emission reduction as well as low cost and device |
| CN102530893A (en) * | 2012-03-08 | 2012-07-04 | 青岛科技大学 | Nitric acid extraction and concentration method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103523761A (en) * | 2013-10-15 | 2014-01-22 | 苏州市晶协高新电子材料有限公司 | Continuous nitric acid discoloring device and method thereof |
| CN103523761B (en) * | 2013-10-15 | 2015-08-05 | 苏州市晶协高新电子材料有限公司 | A kind of nitric acid continuous stripping devices and methods therefor |
| CN104986743A (en) * | 2015-07-09 | 2015-10-21 | 安徽淮化股份有限公司 | Bleaching process and device used in nitric acid preparation process |
| CN104986743B (en) * | 2015-07-09 | 2018-07-27 | 安徽淮化股份有限公司 | Bleaching process and its device in a kind of nitric acid process for preparation |
| CN106586985A (en) * | 2015-10-14 | 2017-04-26 | 安徽华尔泰化工股份有限公司 | Concentrated nitrate tail gas recovery apparatus |
| CN113426270A (en) * | 2021-08-10 | 2021-09-24 | 联仕(昆山)化学材料有限公司 | White blowing device and white blowing process for producing electronic-grade nitric acid |
| CN115784179A (en) * | 2022-11-17 | 2023-03-14 | 安徽金禾实业股份有限公司 | Process for co-producing nitric acid with various concentrations through super-azeotropic rectification |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103112835B (en) | 2014-11-26 |
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