CN105013382B - Device for bleaching nitric acid solution through urea method and preparation method therefor - Google Patents
Device for bleaching nitric acid solution through urea method and preparation method therefor Download PDFInfo
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- CN105013382B CN105013382B CN201510399694.5A CN201510399694A CN105013382B CN 105013382 B CN105013382 B CN 105013382B CN 201510399694 A CN201510399694 A CN 201510399694A CN 105013382 B CN105013382 B CN 105013382B
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Abstract
The invention provides a device for bleaching a nitric acid solution through a urea method and a preparation method therefor. The device comprises an acid preparation tank and a urea storage tank, wherein the acid preparation tank is connected with the urea storage tank through a communicating pipe; the top end of the acid preparation tank is connected with one inlet end of an ejector through a nitrogen dioxide pipe, the other inlet end of the ejector is connected with the urea storage tank, and the outlet end of the ejector is connected with a liquid distributor horizontally arranged inside the acid preparation tank through a urea pipe; and the outlet of the urea storage tank is connected with the urea pipe and the ejector respectively through a circulating conveying pump. Under micro negative pressure, NO2 in nitric acid and a urea solution both enter the ejector for reaction, and enter the acid preparation tank together with the urea solution to react with carbon dioxide generated later. Long-acting colorlessness of the nitric acid solution can be realized for a long time, so that the content of carbon dioxide in the acid preparation tank is quickly controlled, and the content overstandard problem of nitrogen dioxide is solved.
Description
Technical field
The present invention relates to nitric acid production preparing technical field, and in particular to a kind of device of urea method bleaching salpeter solution and
Its preparation method.
Background technology
Nitric acid is the inorganic acid of a kind of strong oxidizing property, severe corrosive, and acid anhydrides is dinitrogen pentoxide.Nitric acid is soluble in water,
Ionize completely in water, nitric acid weak solution is in colourless or pale yellow transparent shape under normal temperature, concentrated solution shows brown.Nitric acid is unstable, easily
See that light decomposes, should keep in dark place in shady place in brown bottle, forbid to be contacted with reducing agent.Nitric acid is industrially mainly with ammonia oxygen
Change method is produced, and to manufacture chemical fertilizer, explosive, nitrate etc., in organic chemistry, red fuming nitric acid (RFNA) is important with the mixed liquor of the concentrated sulfuric acid
Nitrating agent.
At present nitric acid is applied in all trades and professions, but different industries require concentration of nitric acid to differ, such as:Neutralisation produces nitric acid
Ammonium needs nitric acid that concentration is 37-43% as raw material, and pressurization production ammonium nitrate needs nitric acid that concentration is 60% as original
Material；IT industries need the nitric acid that concentration is 68%, and many demand concentration of iron and steel cleaning industry are the nitric acid of 30-40%.
But the concentration of nitric acid of double pressurization dilute nitric acid production device productions is 60%, and the concentration of nitric acid of a nitre device production is
98%, nitre device byproduct dust technology between production red fuming nitric acid (RFNA), its concentration is 3-5%.The concentration of said apparatus production nitric acid differs
Surely meet customer need, client still needs to voluntarily prepare the aqueous solution of nitric acid of variable concentrations, but preparing aqueous solution of nitric acid process
In, red fuming nitric acid (RFNA) and dust technology mixing can produce heat, and can cause a small amount of nitric acid and decompose, and its reaction equation is 4HNO3==2H2O +
4NO2 +O2, so that dilute nitric acid solution is changed into red comprehensive color, even if colourless dust technology also micro decomposition NO in transportation2, it is dirty
Dye environment.
Conventional dust technology bleaching is often using air or steam, i.e. " cold drift " or " heat drift ", but both technologies have scarce
Fall into, a large amount of electric energy or heat energy are often expended, while taking a significant amount of time；And can not solve dust technology prepare and storage and transport process in
The NO of generation2。
The content of the invention
The present invention provides a kind of device of urea method bleaching salpeter solution and preparation method thereof, solves dust technology and is preparing
With the NO produced in storage and transport process2。
Present invention employs following technical scheme：
A kind of urea method bleaches the device of salpeter solution, described to pass through connection with acid tank comprising with acid tank and urea basin
Conduit is connected with urea basin；The top with acid tank is connected by nitrogen dioxide pipe with the arrival end of injector, the spray
Another arrival end of emitter is connected with urea basin, and the port of export of the injector is located at in acid tank by urea tube with level
The liquid distribution trough connection in portion；The outlet of the urea basin is connected respectively by circulation conveying pump with urea tube, injector.
Further scheme, described with the first cooling tube is provided with acid tank, and in the urea basin the second cooling tube is provided with.
The top with acid tank is connected to concentrated acid pipe and diluted acid pipe.
The liquid distribution trough be located at in the middle of acid tank away from the 20cm of its bottom.
Another goal of the invention of the present invention is to provide the preparation method that a kind of above-mentioned urea method bleaches salpeter solution, including
Following steps：
（1）ON cycle delivery pump, the urea liquid Jing injectors in urea basin is circulated, so as to urea be store
Tank and connect with urea basin with being pumped into tiny structure inside acid tank；
（2）Circulation conveying pump is closed, dust technology and red fuming nitric acid (RFNA) are passed through simultaneously to in acid tank, be made into the nitre of desired concn
Acid；
（3）With the NO produced in acid tank2From the effusion of its top export, and by nitrogen dioxide pipe import in injector with enter
The urea liquid entered in injector is mixed；
（4）The injector port of export is by urea tube to entering to add urea liquid with acid tank.
Further scheme, the step（1）In urea basin and with the tiny structure in acid tank be -5～-10Pa.
Further scheme, the step（4）In, analysis is with NO in acid tank2Content, the addition of urea liquid be urea with
NO2Mol ratio be 5：6～6：6.
Further scheme, the concentration of the urea liquid is 32.5% aqueous solution.
Alkalescent is presented in strong acid solution according to urea, and its alkalescence is extremely weak, so that urea and NO in nitric acid2Effect
It is quickly generated water, nitrogen and carbon dioxide, 4CO (NH2)2+6NO2=4CO2+7N2+8H2O.Carbon dioxide is generated again with water reaction
Nitric acid.
Before urea addition, NO in dust technology is analyzed first2Content, according to urea in reaction equation and NO2Mol ratio 4:6, it is real
Selection indicators are urea and NO in the addition of border2Mol ratio 5:6—6:6.Secondly by the urea liquid for preparing（32.5%）It is uniformly added into
In dust technology.Above measure ensures urea with respect to NO2It is excessive, can guarantee that the dioxy that dust technology is produced in storage and transportation
Changing nitrogen can be quickly complete by urea reaction, it is ensured that dilute nitric acid solution long-time is colourless, prevents from polluting environment.
First the decomposition when mixture is carried out in acid tank generates nitrogen dioxide, ON cycle delivery pump to diluted acid with concentrated acid
Afterwards, urea liquid is circulated by injector, so as to will be with being pumped into tiny structure in acid tank and urea basin.Matching somebody with somebody with acid tank
The NO produced during acid2Most of to escape from its top export, Jing nitrogen dioxide pipe is entered in injector；While urea basin
Interior urea liquid is reacted rapidly in injector with nitrogen dioxide.
In addition, urea liquid Jing injector port of export Jing urea tubes, liquid distribution trough are directly added into the nitric acid for being with acid tank
In solution, and ensure urea relative to NO2It is excessive, enable nitrogen dioxide in salpeter solution quickly complete by urea reaction, it is ensured that
Salpeter solution long-time is colourless, prevents from polluting environment.
The present invention is made with tiny structure is kept in acid tank, is overflowed and contaminated air so as to avoid nitrogen dioxide.To with acid tank
The amount of the urea being inside passed through is controlling, uniformly to be added by liquid distribution trough according to the amount with the nitrogen dioxide produced in acid tank
Enter acid tank, it is ensured that salpeter solution is colourless.
The amount of the urea spent by the present invention is few, and simultaneous reactions are rapid, change conventional nitric acid compound method both time-consuming
Again the drawbacks of high cost.
The present invention can make salpeter solution colourless by the amount of control addition urea, and keep long-acting, ensure under natural conditions
Salpeter solution several months in conventional groove tank is colourless.
With cooling tube is equipped with acid tank and urea basin in the present invention, the amount that nitric acid decomposes is reduced, so as to reach reduction
The addition of urea liquid, reduces cost.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
In figure：1- matches somebody with somebody acid tank, the cooling tubes of 2- first, 3- liquid distribution troughs, the cooling tubes of 4- second, 5- circulation conveying pumps, 6-
Urea basin, 7- injectors, 8- concentrated acid pipes, 9- diluted acid pipes, 10- nitrogen dioxide pipes, 11- connecting tubes, 12- urea tubes.
Specific embodiment
It is described in further detail below in conjunction with accompanying drawing：
Embodiment one：
As shown in figure 1, a kind of urea method bleaches the device of salpeter solution, it is described to match somebody with somebody comprising with acid tank 1 and urea basin 6
Acid tank 1 is connected by connecting tube 11 with urea basin 6；The top with acid tank 1 is by nitrogen dioxide pipe 10 and injector 7
Arrival end connection, another arrival end of the injector 7 is connected with urea basin 6, and the port of export of the injector 7 is by urinating
Plain pipe 12 is connected with level located at the liquid distribution trough 3 matched somebody with somebody inside acid tank 1；The outlet of the urea basin 6 passes through circulation conveying
Pump 5 is connected respectively with urea tube 12, injector 7.
Further, described with the first cooling tube 2 is provided with acid tank 1, the urea basin 6 is interior to be provided with the second cooling tube 4.
The top with acid tank 1 is connected to concentrated acid pipe 8 and diluted acid pipe 9.
Preferably, the liquid distribution trough 3 be located at in the middle of acid tank 1 away from the 20cm of its bottom.
The decomposition when mixture is carried out in acid tank generates nitrogen dioxide to diluted acid with concentrated acid, after ON cycle delivery pump, urine
Plain solution is circulated by injector, so as to will be with being pumped into tiny structure in acid tank and urea basin.With acid tank in complex acid mistake
The NO produced in journey2Most of to escape from its top export, Jing nitrogen dioxide pipe is entered in injector；Urinate in urea basin simultaneously
Plain solution is reacted rapidly in injector with nitrogen dioxide.Then by urea liquid Jing injector port of export Jing urea
Pipe, liquid distribution trough are directly added in the salpeter solution for being with acid tank, and ensure urea relative to NO2It is excessive, make salpeter solution
Middle nitrogen dioxide can be quickly complete by urea reaction, it is ensured that salpeter solution long-time is colourless, prevents from polluting environment.
Embodiment two：
A kind of urea method bleaches the preparation method of salpeter solution, comprises the following steps：
（1）ON cycle delivery pump, the urea liquid Jing injectors in urea basin is circulated, so as to urea be store
Tank and connect with urea basin with being pumped into -10Pa tiny structures inside acid tank；
（2）Circulation conveying pump is closed, dust technology and red fuming nitric acid (RFNA) are passed through simultaneously to in acid tank, be made into the nitre of desired concn
Acid；
（3）With the NO produced in acid tank2From the effusion of its top export, and by nitrogen dioxide pipe import in injector with enter
The urea liquid entered in injector is mixed；
（4）The injector port of export by urea tube to add in acid tank account for nitric acid gross mass in acid tank ten thousand/
First, concentration is 32.5% urea liquid, makes urea and NO in the urea liquid of addition2Mol ratio be 6：6.
Embodiment three：
A kind of urea method bleaches the preparation method of salpeter solution, comprises the following steps：
（1）ON cycle delivery pump, the urea liquid Jing injectors in urea basin is circulated, so as to urea be store
Tank and connect with urea basin with being pumped into -5Pa tiny structures inside acid tank；
（2）Circulation conveying pump is closed, dust technology and red fuming nitric acid (RFNA) are passed through simultaneously to in acid tank, be made into the nitre of desired concn
Acid；
（3）With the NO produced in acid tank2From the effusion of its top export, and by nitrogen dioxide pipe import in injector with enter
The urea liquid entered in injector is mixed；
（4）The injector port of export accounts for a ten thousandth with nitric acid gross mass in acid tank by urea tube to addition in acid tank
The point five, urea liquid that concentration is 32.5%, makes urea and NO in the urea liquid of addition2Mol ratio be 5：6.
Example IV：
Urea liquid is 32.5% aqueous solution of urea；
Concentration 40% with salpeter solution in acid tank 1,30 tons of gross weight, NO2Content 100ppm；
Concentration 50% with salpeter solution in acid tank 2,30 tons of gross weight, NO2Content 130ppm；
Concentration 68% with salpeter solution in acid tank 3,1 ton of gross weight, NO2Content 145ppm；
Concentration 75% with salpeter solution in acid tank 4,1 ton of gross weight, NO2Content 1500ppm；
Above salpeter solution 1-4 is all what 98 acid, 60 acid and water were blent.
Experiment 1：The aqueous solution of urea for Jia 32.5% in dilute nitric acid solution 1（Folding hundred）4kg, is uniformly added into, molten after 2 minutes
Liquid is colourless, stores colourless in 15 days under sunshine.
Experiment 2：The aqueous solution of urea 3.2kg for Jia 32.5% in dilute nitric acid solution 2（Folding hundred）, solution colour shoals, then adds
Enter 2kg（Folding hundred）, it is uniformly added into, solution is gradually colourless after 2 minutes, stores colourless in 15 days under sunshine.
Experiment 3：The aqueous solution of urea 0.2kg for Jia 32.5% in dilute nitric acid solution 3（Folding hundred）, it is uniformly added into, after 3 minutes
Solution is gradually colourless, stores colourless in 15 days under sunshine.
Experiment 4：The aqueous solution of urea 2kg for Jia 32.5% in dilute nitric acid solution 4（Folding hundred）, it is uniformly added into, it is molten after 10 minutes
Liquid is colourless, stores colourless in 15 days under sunshine.
Conclusion：NO2Relative urea excess, dilute nitric acid solution is still coloured；Using the relative NO of urea2It is excessive, can guarantee that dilute nitre
The nitrogen dioxide that acid is produced in storage and transportation can be quickly complete by urea reaction, it is ensured that dilute nitric acid solution long-time nothing
Color, prevents from polluting environment.
Above example is not limited only to protection scope of the present invention, all to be repaiied based on basic thoughts of the invention
What is changed or change belongs to protection scope of the present invention.
Claims (8)
1. a kind of urea method bleaches the device of salpeter solution, comprising with acid tank（1）With urea basin（6）, it is characterised in that：It is described
With acid tank（1）By connecting tube（11）With urea basin（6）Connection；It is described with acid tank（1）Top pass through nitrogen dioxide pipe
（10）With injector（7）Arrival end connection, the injector（7）Another arrival end and urea basin（6）Connection, the spray
Emitter（7）The port of export pass through urea tube（12）With level located at acid tank（1）Internal liquid distribution trough（3）Connection；It is described
Urea basin（6）Outlet pass through circulation conveying pump（5）Respectively with urea tube（12）, injector（7）Connection.
2. device according to claim 1, it is characterised in that：It is described with acid tank（1）Inside it is provided with the first cooling tube（2）, institute
State urea basin（6）Inside it is provided with the second cooling tube（4）.
3. device according to claim 1, it is characterised in that：It is described with acid tank（1）Top be connected to concentrated acid pipe
（8）With diluted acid pipe（9）.
4. device according to claim 1, it is characterised in that：The liquid distribution trough（3）Positioned at acid tank（1）It is middle from
At the 20cm of its bottom.
5. a kind of urea method bleaches the preparation method of salpeter solution, it is characterised in that：Comprise the following steps：
（1）ON cycle delivery pump, the urea liquid Jing injectors in urea basin are circulated, so as to by urea basin and
Connect with urea basin with being pumped into tiny structure inside acid tank；
（2）Circulation conveying pump is closed, dust technology and red fuming nitric acid (RFNA) are passed through simultaneously to in acid tank, be made into the nitric acid of desired concn；
（3）With the NO produced in acid tank2From its top export effusion, and by spraying with entering in nitrogen dioxide pipe importing injector
Urea liquid in emitter is mixed；
（4）The injector port of export is by urea tube to entering to add urea liquid with acid tank.
6. preparation method according to claim 5, it is characterised in that：The step（1）In urea basin and with acid tank
Interior tiny structure is -5～-10Pa.
7. preparation method according to claim 5, it is characterised in that：The step（4）In, analysis is with NO in acid tank2Contain
Amount, the addition of urea liquid is urea and NO2Mol ratio be 5：6～6：6.
8. preparation method according to claim 5, it is characterised in that：The concentration of the urea liquid be 32.5% it is water-soluble
Liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510399694.5A CN105013382B (en) | 2015-07-09 | 2015-07-09 | Device for bleaching nitric acid solution through urea method and preparation method therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510399694.5A CN105013382B (en) | 2015-07-09 | 2015-07-09 | Device for bleaching nitric acid solution through urea method and preparation method therefor |
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| CN105013382B true CN105013382B (en) | 2017-05-10 |
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| CN102807197B (en) * | 2012-08-30 | 2014-01-08 | 安徽淮化股份有限公司 | Control and recovery system for nitrogen dioxide content |
| CN103395759B (en) * | 2013-08-02 | 2015-01-14 | 柳州化工股份有限公司 | Decolouring method of prepared aqueous nitric acid solution |
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Effective date of registration: 20210506 Address after: 234000 No. 157, Xichang Road, Suzhou, Anhui Patentee after: WANBEI COAL-ELECTRICITY GROUP Co.,Ltd. Address before: 232038 Anhui Huainan Tian Jia An District Quanshan Anhui Huaihua Limited by Share Ltd technology research and Development Center Patentee before: ANHUI HUAIHUA CHEMICAL GROUP Co.,Ltd. |
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Granted publication date: 20170510 Termination date: 20210709 |