CN107867676A - Nitric oxide wet process oxidation technology - Google Patents
Nitric oxide wet process oxidation technology Download PDFInfo
- Publication number
- CN107867676A CN107867676A CN201610852123.7A CN201610852123A CN107867676A CN 107867676 A CN107867676 A CN 107867676A CN 201610852123 A CN201610852123 A CN 201610852123A CN 107867676 A CN107867676 A CN 107867676A
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- CN
- China
- Prior art keywords
- acid
- nitrogen dioxide
- nitric oxide
- absorber portion
- nitric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/36—Nitrogen dioxide (NO2, N2O4)
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Gas Separation By Absorption (AREA)
Abstract
Nitric oxide wet process oxidation technology, belong to nitric acid technical field, be included in nitric acid absorber, oxides of nitrogen gas from separator enters mixed gas absorber portion by bottom of towe, after absorbing nitrogen dioxide from the nitric acid of nitrogen dioxide absorber portion, the finished acid of generation, sour storehouse is delivered to after going out tower；Unabsorbed nitrogen dioxide gas enters oxidation panel with nitric oxide gas, nitric oxide contacts generation nitrogen dioxide with air inversion, subsequently into nitrogen dioxide absorber portion, after generation dust technology being absorbed by the water of tower top spray, dust technology by nitrogen dioxide absorber portion bottom sieve plate acid guiding pipe, it is descending along tower wall, it is directly entered mixed gas absorber portion, it is characterised in that oxidation panel also has the nitric acid for cooling down.The gas temperature that the present invention enters nitrogen dioxide absorber portion is controlled in less than 40 DEG C, sour absorber portion acid strength is successively decreased with being incremented by for sieve plate number, thus brings, and bottom of towe goes out acid concentration more than 50%, makes product quality stable.
Description
Technical field
The present invention relates to chemical field, and in particular to a kind of nitric oxide wet process oxidation technology.
Background technology
Nitric acid is produced generally by ammoxidation, and its technical process is usually：Ammonia is catalyzed in high temperature by platinum-rhodium alloy net
Oxidation generation nitric oxide, after reclaiming heat through waste heat boiler, by entering acid absorption column after separator, one in acid absorption column
Nitrogen oxide continues oxidation generation nitrogen dioxide, absorbs nitrogen dioxide generation nitric acid with water, and acid absorption column tail gas enters alkali adsorption tower,
Neutralizer is produced, further produces salt made from earth containing a comparatively high percentage of sodium chloride.
Nitric oxide production dry oxidation is typically used in the acid absorption column of prior art, is absorbed below with the acid of 12 layers of column plate
It is specifically described exemplified by tower：9 layers go out acid and have an acid tube to lead to outside tower, come downwards to 4 layers subsequently into tower along wall, are bleached
Acid is gone out by bottom of towe afterwards.Absorption tower 5-8 layers do not have liquid presence, in this 4 layers of column plates, utilize the oxidation of air and unabsorbed nitrogen
Thing counter current contacting, it is nitrogen dioxide by conversion of nitric oxide gas, is referred to as " nitric oxide oxygen in the step industry in this 4 layers
Change ".Because the reaction is exothermic reaction, gas can constantly bring the heat of generation into upper strata column plate, cause the acid of 9-10 layers
Degree can not improve, and the acid concentration of 9,10 layers of column plate occur less than the phenomenon of 11,12 layers of column plate acid concentration, cause bottom of towe acid concentration
Requirement often up to qualified less than design.
The content of the invention
The present invention is directed to problems of the prior art, there is provided a kind of nitric oxide wet process oxidation technology, main profit
With the acid solution of low temperature in oxidation of nitric oxide section absorbing reaction liberated heat, solve the problems of the prior art.
The present invention adopts the following technical scheme that realization：
Nitric oxide wet process oxidation technology, it is included in nitric acid absorber, the oxides of nitrogen gas from separator is by tower
Bottom enters mixed gas absorber portion, after absorbing nitrogen dioxide from the nitric acid of nitrogen dioxide absorber portion, the finished acid of generation, goes out
Sour storehouse is delivered to after tower；Unabsorbed nitrogen dioxide gas enters oxidation panel, nitric oxide and air inversion with nitric oxide gas
Contact generation nitrogen dioxide, subsequently into nitrogen dioxide absorber portion, by dust technology after the water absorption generation dust technology of tower top spray
It is descending along tower wall by the acid guiding pipe of nitrogen dioxide absorber portion bottom sieve plate, it is directly entered mixed gas absorber portion, it is characterised in that
Oxidation panel also has the nitric acid for cooling down.
Specific technical scheme of the invention is as follows：The superiors that nitric acid from cooler enters oxidation of nitric oxide section sieve
Plate, and nitric oxide gas counter current contacting from bottom to top, and after absorbing reaction heat, from the orlop tower of oxidation of nitric oxide section
Plate enters sour storage tank, and squeezes into cooler by sour pump, circulates according to this.
The temperature for cooling down nitric acid is 30-40 DEG C；Supplemented in sour storage tank by the qualified finished acid from acid absorption column；Sour pump
Another outlet connects sour storehouse；Acid absorption column goes out acid concentration >=50%；The acid strength of upper absorber portion is passed with successively decreasing for pedal
Increase.
Beneficial effect is possessed by the present invention：Into nitrogen dioxide absorber portion gas temperature be controlled in 40 DEG C with
Under, make nitrogen dioxide absorber portion acid strength with successively decreasing for sieve plate number and be incremented by that (sieve plate number successively decreases 1 layer, the increase of the concentration of nitric acid
One percentage point), thus bring, bottom of towe goes out acid concentration more than 50%, makes product quality stable.
Embodiment
Embodiment
Carried out by the ammonia that preliminary filtered air and liquefied ammonia evaporate according to the ratio of prior art in blender
Mixing, subsequently into ammoxidation device, the nitrogen oxides of reaction, after reclaiming heat through waste heat boiler, into acid absorption column, acid absorbs
The water of tower origin self-water-supplying process carries out spray-absorption.
Absorption tower 1-4 layers sieve plate is mixed gas absorber portion, and 5-8 layers sieve plate is oxidation of nitric oxide section, and 9-12 sections are two
Nitrogen oxide absorber portion.
9 layers of absorption tower, which go out acid, has an acid tube to lead to outside tower, and 4 layers of sieve plate are come downwards to along wall, subsequently into tower, further
After absorbing the nitrogen dioxide in mixed gas, bleaching generation finished acid is carried out, acid is gone out by bottom of towe.From the nitric acid (temperature of cooler
For 30-40 DEG C) enter 8 layers of sieve plate of oxidation of nitric oxide section, and nitric oxide gas counter current contacting from bottom to top, and absorb
After reaction heat, enter sour storage tank from 5 layers of sieve plate of oxidation of nitric oxide section, and cooler is squeezed into by sour pump, circulate according to this；Sour storage tank
It is interior to be supplemented by the qualified finished acid from acid absorption column；Another outlet of sour pump connects sour storehouse；Acid absorption column go out acid concentration >=
50%, bottom of towe goes out acid and squeezes into sour storehouse.
The tail gas that acid absorbs enters alkali adsorption tower by the top of tower, produces neutralizer, neutralizer removes salt made from earth containing a comparatively high percentage of sodium chloride.
Claims (3)
1. nitric oxide wet process oxidation technology, being included in nitric acid absorber, the oxides of nitrogen gas from separator is by bottom of towe
Into mixed gas absorber portion, after absorbing nitrogen dioxide from the nitric acid of nitrogen dioxide absorber portion, the finished acid of generation, go out tower
After deliver to sour storehouse；Unabsorbed nitrogen dioxide gas enters oxidation panel with nitric oxide gas, and nitric oxide connects with air inversion
Touch generation nitrogen dioxide, subsequently into nitrogen dioxide absorber portion, after absorbing generation dust technology by the water of tower top spray, dust technology by
The acid guiding pipe of nitrogen dioxide absorber portion bottom sieve plate, it is descending along tower wall, it is directly entered mixed gas absorber portion, it is characterised in that oxygen
Change section and also have the nitric acid for being used for cooling down；Nitric acid from cooler enters the superiors' sieve plate of oxidation of nitric oxide section, under certainly
Nitric oxide gas counter current contacting on and, and after absorbing reaction heat, enter acid from the orlop column plate of oxidation of nitric oxide section
Storage tank, and cooler is squeezed into by sour pump, circulate according to this.
2. nitric oxide wet process oxidation technology according to claim 1, it is characterised in that the temperature for cooling down acid is 30-40
℃；Acid absorption column goes out acid concentration >=50%.
3. nitric oxide wet process oxidation technology according to claim 1, it is characterised in that by being absorbed from acid in sour storage tank
The qualified finished acid supplement of tower；Another outlet of sour pump connects sour storehouse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610852123.7A CN107867676A (en) | 2016-09-26 | 2016-09-26 | Nitric oxide wet process oxidation technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610852123.7A CN107867676A (en) | 2016-09-26 | 2016-09-26 | Nitric oxide wet process oxidation technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107867676A true CN107867676A (en) | 2018-04-03 |
Family
ID=61751147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610852123.7A Pending CN107867676A (en) | 2016-09-26 | 2016-09-26 | Nitric oxide wet process oxidation technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107867676A (en) |
-
2016
- 2016-09-26 CN CN201610852123.7A patent/CN107867676A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180403 |