CN101428774A - Method for continuously dilution diluting aqua fortis and controlling generation of NO2 - Google Patents
Method for continuously dilution diluting aqua fortis and controlling generation of NO2 Download PDFInfo
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- CN101428774A CN101428774A CNA2008101595540A CN200810159554A CN101428774A CN 101428774 A CN101428774 A CN 101428774A CN A2008101595540 A CNA2008101595540 A CN A2008101595540A CN 200810159554 A CN200810159554 A CN 200810159554A CN 101428774 A CN101428774 A CN 101428774A
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- nitric acid
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Abstract
The invention relates to a method for continuously diluting aquafortis and controlling the production of NO2, which is characterized in that the method comprises the following steps: causing the auqafortis to flow through a flat-bottomed channel; continuously spraying water to the surface of flowing nitric acid from the upper part, so that the auqafortis and the water are mixed during the flowing process; and collecting diluted nitric acid by using a container arranged at the other low end of the flat-bottomed channel. An interlayer is arranged at the bottom part of the flat-bottomed channel; and a cooling medium is introduced into the interlayer, so as to further reduce and dilute the temperature of the nitric acid. The invention has the advantages that the water is continuously sprayed on the surface of the flowing nitric acid to increase and dilute the contact area of a heating part, air and the cooling medium; and liquid finishes the mixture during the flowing process and immediately carries away heat generated to control heat accumulation during the diluting process, so that the temperature of the heating part is reduced, the decomposition of the nitric acid is controlled or avoided, and the continuous and automatic diluting process of the auqafortis is achieved.
Description
Technical field
The present invention relates to NO in a kind of serial dilution concentrated nitric acid and the control process
2The method that produces.
Technical background
Nitric acid is as the basic chemical industry raw material, and general use is very extensive, and there is different requirements in different enterprises to concentration of nitric acid.The general industrial nitric acid concentration of producing of nitric acid production producer is 98%, need during use nitric acid added and be diluted to desired concn in the entry, the general method that adds is in advance a certain amount of water to be added in the container, then to wherein adding nitric acid, reach blowing behind the desired concn, begin the operation of next round again.Be a kind of method of being interrupted dilution, and heat release very easily causes heat accumulation in the nitric acid dilution, make nitric acid decompose the NO that produces
2, not only contaminate environment but also cause the wasting of resources.Handle NO
2Waste gas can cause new resource input and waste again, or causes low load with strong power or pollution transportation.This is a difficult problem that perplexs the concentrated nitric acid dilution for a long time.By retrieval, Chinese patent application numbers 200710117994.5 discloses a kind of dilution process of concentrated nitric acid, and its adopts and place de-salted water in advance in handtailor container, adds concentrated nitric acid to substep wherein then, and adopts cooling-cycle device to cool off.This method is greatly improved in the general traditional method of efficiency ratio of dilution concentrated nitric acid, but it still adopts the interruption dilution process, and the equipment more complicated that is adopted, and the concentrated nitric acid dilution efficiency still has the space of further raising.
Summary of the invention
Purpose of the present invention is exactly in order to overcome lower, the NO of efficient that existing concentrated nitric acid stepwise dilution method exists
2Pollute big, the complicated shortcoming of diluent facilities, provide a kind of can the serial dilution concentrated nitric acid and control process in NO
2The method that produces.
The technical scheme that adopts of the present invention is:
The serial dilution concentrated nitric acid is also controlled NO
2The method that produces is characterized in that: in the concentrated nitric acid dilution, concentrated nitric acid is all contacted with the state uniform mixing of continuous flow with water.
On the basis of above-mentioned basic technical scheme, further technical scheme is: make the concentrated nitric acid flat passage of flowing through, continuously water is sprayed to mobile nitric acid surface by the top, the two is mixed in flow process, collect dilution nitric acid by the container that another low side of flat passage is provided with.
The flat passage that described flat passage is made by the corrosive of anti-nitric acid stainless steel or aluminium sheet, flat channel bottom is provided with interlayer, and logical cooling media in the interlayer is as water coolant etc., with the temperature of further reduction dilution nitric acid.
Concentrated nitric acid passes through pipe-line transportation by power-driven pump, different by weaker concn with amount of dilution, dominant discharge, make nitric acid by exporting continuous outflow, flowing through can the corrosive of anti-nitric acid stainless steel or the flat passage made of aluminium sheet, this channel bottom can be made and to have interlayer, be used for leading to cooling media in case of necessity, temperature with further reduction dilution nitric acid, at the passage upper opening, the waterpipe with the pump attachment strap sparger sprays to mobile nitric acid surface to water continuously, the two is mixed in flow process, reduce, control heat accumulation.When salpeter solution temperature rise to 40 ℃, can adopt the cooling media cooling.On mobile nitric acid surface, spray water continuously, increase the area that the dilution heating position contacts with air, cooling media, liquid is finished the heat that mixes and in time take away generation in flowing, heat accumulation in the control dilution, with effective reduction heating position temperature, control or avoid causing the nitric acid decomposition.
The invention has the advantages that: increase the area that the dilution heating position contacts with air, cooling media, reduce, control the heat accumulation in the dilution,, avoid causing nitric acid to decompose with effective reduction heating position temperature.Realize that the nitric acid dilution is pollution-free, serialization, automatization.
Description of drawings;
Fig. 1 is the synoptic diagram that dilutes concentrated nitric acid in flat passage provided by the invention.
Among the figure: 1-spray water, 2-dilution flat pan, 3-concentrated nitric acid, 4-cooling media, 5-rare nitric acid container.
Embodiment
Shown in Figure 1, stainless steel tube is connected with the concentrated nitric acid storage tank by under meter, power-driven pump, flow on demand with concentrated nitric acid 3 usefulness pump delivery to the right side of flat pan 2 high-end on, make it mobile left, concentration on demand and quantity, spray water 1 is sprayed to mobile concentrated nitric acid 3 surfaces continuously by sparger, and the two mixes in flow process, flows to rare nitric acid container 5 of low side.Can in flat pan 2 bottom interlayers, lead to cooling media 4 during this time to reduce temperature.
Be example with 98% concentrated nitric acid for example, under 20 ℃, the area of the stainless steel tube of pumping concentrated nitric acid is 66cm
2, the concentrated nitric acid flow velocity is 12.63cm/s, the area of dilution tunnel flat pan 2 is 2m
2, injection flow rate is 262cm
3/ s is evenly sprayed by concentrated nitric acid top, makes rare nitric acid temperature below 40 ℃ after the heat radiation of bottom cooling media, 16 ℃ of temperature of cooling water, and rare nitric acid output is 3m
3/ h (4.368t/h), this moment, concentrated nitric acid and water volume ratio were 3.18:1, rare concentration of nitric acid is 81%, in the process because of there not being the local superheating situation, so do not see NO
2Deng production.
Dilute concentrated nitric acid with aforesaid method, can avoid the heat accumulation of dilution, realize serialization, the industrialization of nitric acid dilution, avoid nitric acid to decompose the environmental pollution and the wasting of resources that causes.Environment and economical effects are arranged.
Claims (3)
1, serial dilution concentrated nitric acid and control NO
2The method that produces is characterized in that: in the concentrated nitric acid dilution, concentrated nitric acid is all contacted with the state uniform mixing of continuous flow with water.
2, serial dilution concentrated nitric acid according to claim 1 and control NO
2The method that produces is characterized in that: make the concentrated nitric acid flat passage of flowing through, continuously water is sprayed to mobile concentrated nitric acid surface by the top, the two is mixed in flow process, collect dilution nitric acid by the container that flat passage opposite side low side is provided with.
3, serial dilution concentrated nitric acid according to claim 2 and control NO
2The method that produces, it is characterized in that: described flat channel bottom is provided with interlayer, and logical cooling media in the interlayer is with the temperature of further reduction dilution nitric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101595540A CN101428774A (en) | 2008-11-25 | 2008-11-25 | Method for continuously dilution diluting aqua fortis and controlling generation of NO2 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101595540A CN101428774A (en) | 2008-11-25 | 2008-11-25 | Method for continuously dilution diluting aqua fortis and controlling generation of NO2 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101428774A true CN101428774A (en) | 2009-05-13 |
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ID=40644456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101595540A Pending CN101428774A (en) | 2008-11-25 | 2008-11-25 | Method for continuously dilution diluting aqua fortis and controlling generation of NO2 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101428774A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102807197A (en) * | 2012-08-30 | 2012-12-05 | 安徽淮化股份有限公司 | Control and recovery system for nitrogen dioxide content |
| CN103834497A (en) * | 2014-03-24 | 2014-06-04 | 成都先进功率半导体股份有限公司 | Epoxy resin corrodent and application of epoxy resin corrodent in removal of semiconductor packaging material |
-
2008
- 2008-11-25 CN CNA2008101595540A patent/CN101428774A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102807197A (en) * | 2012-08-30 | 2012-12-05 | 安徽淮化股份有限公司 | Control and recovery system for nitrogen dioxide content |
| 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 |
| CN103834497A (en) * | 2014-03-24 | 2014-06-04 | 成都先进功率半导体股份有限公司 | Epoxy resin corrodent and application of epoxy resin corrodent in removal of semiconductor packaging material |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090513 |