CN107814365A - A kind of juice circulation method of dust technology produced by processing nitrotoleune Waste Sulfuric Acid - Google Patents
A kind of juice circulation method of dust technology produced by processing nitrotoleune Waste Sulfuric Acid Download PDFInfo
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- CN107814365A CN107814365A CN201711044153.6A CN201711044153A CN107814365A CN 107814365 A CN107814365 A CN 107814365A CN 201711044153 A CN201711044153 A CN 201711044153A CN 107814365 A CN107814365 A CN 107814365A
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- nitrogen oxide
- oxide gas
- nitrotoleune
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- sulfuric acid
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- 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
- C01B21/38—Nitric acid
- C01B21/44—Concentration
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- 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
- C01B21/38—Nitric acid
- C01B21/40—Preparation by absorption of oxides of nitrogen
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Abstract
The invention discloses a kind of juice circulation method of dust technology produced by processing nitrotoleune Waste Sulfuric Acid, step is：Start-up；Production phase, it is 15% 40% low concentration dust technologies by the mass fraction that denitration condenser is handled from Waste Sulfuric Acid, cools, control is more than nitrotoleune with the concentrated nitric acid Mixed adjustment of mass fraction more than 50% to density；Isolate free nitrotoleune liquid, oxidized nitrogen compressor set concentrate more than 50%；Continue on for subsequently adjusting density after the obtained concentrated nitric acid part of concentration more than 50%, another part is discharged into finished product tank field；The oxidized nitrogen compressor compresses of nitrogen oxide gas absorb, then oxidized nitrogen absorption tower absorbs rear discharge up to standard.The nitrotoleune separation of present invention low concentration dust technology suitable for sulfur waste acid treatment and concentration improve, and improve the use value of low value dust technology, preferably solve the problems, such as the line balancing of dust technology, improve the economy of sulfur waste acid treatment.
Description
Technical field
The present invention relates to spent acid concentrate chemical process, dust technology produced by handling nitrotoleune Waste Sulfuric Acid in particular to one kind
Juice circulation method.
Background technology
At present, relatively advanced sulfur waste acid treatment process is inhaled for the vacuum concentration of Waste Sulfuric Acid and the pressurization of nitrogen oxide in the world
Receive；The condensation dust technology that concentration is 15%-40% is typically produced in the denitration process that Waste Sulfuric Acid is concentrated in vacuo, if Waste Sulfuric Acid is nitre
Base toluene spent acid, then contain largely free nitrotoleune in dust technology；Nitrogen oxide caused by Waste Sulfuric Acid denitration process is condensed
It is sent into nitrogen oxide pressure oxidation nitrogen absorption tower afterwards to absorb, pressure oxidation nitrogen absorption tower typically uses 0.65mPa operating pressures, absorbs
Nitrogen oxide in tail gas concentration of emission≤240mg/m3；Nitrogen oxide absorption tower obtains 50% concentration nitric acid；Dust technology is condensed to be sent into
Dust technology groove and 50% nitric acid obtained from smoke of gunpowder nitrogen oxide absorption tower are mixed into 40% dust technology as finished product dust technology
Use.
Contain largely free nitro compound in dust technology；The density range of dust technology is 1.1kg/L-1.25kg/L,
The density of nitro compound is about 1.19kg/L, and the density of two kinds of materials is very close, it is difficult to realize free nitro compound from
Continuously separated in dust technology；In follow-up nitrification production, a large amount of nitro compounds waste, and merge side reaction and produce.
Therefore, it is necessary to develop it is a kind of free nitro compound is successfully separated, the processing nitre of dust technology concentrate to 50%
The juice circulation method of dust technology produced by base toluene Waste Sulfuric Acid.
The content of the invention
Present invention aim to solve the deficiency of above-mentioned background technology, there is provided one kind processing nitrotoleune Waste Sulfuric Acid institute
Produce the juice circulation method of dust technology.
The technical scheme is that：A kind of juice circulation method of dust technology produced by processing nitrotoleune Waste Sulfuric Acid,
Step is：
Start-up：
By the mass fraction 15%-40% low concentration dust technologies from Waste Sulfuric Acid processing denitration condenser, cool, weight
Power sedimentation separation go on a tour from nitrotoleune, control makes startup sour and 15%- as the nitric acid flow of concentration 50% for starting acid
After 40% low concentration dust technology is mixed into nitrogen oxide gas compressor group, concentration reaches more than 50%；
Production phase：
A. the mass fraction 15%-40% low concentration dust technologies of denitration condenser will be handled from Waste Sulfuric Acid, are cooled,
Control makes it be mixed with 15%-40% low concentration dust technologies from the nitric acid flow of nitrogen oxide gas compressor group mass fraction more than 50%
Afterwards, density is more than nitrotoleune density；
B. gravity settling separation goes out the nitrotoleune to dissociate in mixed nitrate, and the mixed nitrate for separating nitrotoleune is passed through
The nitrogen oxide gas compressor group improves concentration to more than 50%；
C. the nitric acid of concentration more than 50% part obtained and the quality point subsequently from sulfur waste acid treatment denitration condenser
Number 15%-40% low concentrations dust technology carries out step abc and forms circulation technology；Another part is discharged into finished product tank field；
D. caused nitrogen oxide gas merges with nitrogen oxide gas caused by Waste Sulfuric Acid denitration process in system, through the oxygen
Change oxidized nitrogen absorption tower absorption discharge again after nitrogen compressor absorbs；
E. absorb the bottom of the tower absorbing liquid is combined into nitrogen oxide gas compressor group raising concentration with mixed nitrate in step b and arrived
More than 50%.Dust technology concentration in the present invention is mass percent.
Preferably, the mixed nitrate that nitrotoleune was separated in step b enters back into nitrogen oxide gas compressor group through changing hands groove, leads to
Cross and change hands the flow that Liquid level mixed nitrate in groove enters nitrogen oxide gas compressor group.
Preferably, step d is to merge the nitrogen oxide gas that separation process obtains in cooling procedure, step b in step a,
Again with Waste Sulfuric Acid denitration process caused by nitrogen oxide gas merge, oxidized nitrogen absorbs again after nitrogen oxide gas compressor absorption
Tower absorbs discharge.
Preferably, upper end intakes in the concentrated nitric acid density domination absorption tower exported in step d by nitrogen oxide gas compressor group
Amount.
Preferably, the absorption flow quantity of nitrogen oxide gas compressor group is entered in step e by absorb the bottom of the tower Liquid level.
Preferably, step is：
Start-up：
By the mass fraction 15%-40% low concentration dust technologies from Waste Sulfuric Acid processing denitration condenser, cool, weight
Power sedimentation separation go on a tour from nitrotoleune, control, as the sour nitric acid flow of concentration 50% is started, makes startup from changing hands in groove
After acid is mixed into nitrogen oxide gas compressor group with 15%-40% low concentration dust technologies, concentration reaches more than 50%；
Production phase：
A. the mass fraction 15%-40% low concentration dust technologies of denitration condenser will be handled from Waste Sulfuric Acid, are cooled,
Control makes it be mixed with 15%-40% low concentration dust technologies from the concentrated nitric acid flow of nitrogen oxide gas compressor group mass fraction more than 50%
After conjunction, density is more than nitrotoleune density；
B. mixed nitrate passes in succession through automatic segregator, manual separation device isolates free nitrotoleune, will separate
The mixed nitrate of nitrotoleune is passed through the nitrogen oxide gas compressor group again through changing hands groove, concentration is improved to more than 50%, wherein logical
Cross and change hands the flow that Liquid level mixed nitrate in groove enters nitrogen oxide gas compressor group；
C. the nitric acid of concentration more than 50% part obtained is with subsequently coming from sulfur waste acid treatment denitration condenser mass fraction
15%-40% low concentrations dust technology carries out step abc and forms circulation technology；Another part is discharged into finished product tank field；
D. nitrogen oxide gas caused by system intercooler and oxidation nitrogen caused by automatic segregator, manual separation device
Body, change hands caused by groove nitrogen oxide gas and merge, then with Waste Sulfuric Acid denitration process caused by nitrogen oxide gas merge, through the oxygen
Change oxidized nitrogen absorption tower absorption discharge again after nitrogen compressor set absorbs；The concentrated nitric acid density exported by nitrogen oxide gas compressor group
Control upper end inflow in absorption tower；
E. by its flow of absorb the bottom of the tower absorbing liquid Liquid level, nitrogen oxide is combined into mixed nitrate in step b
Compressor set improves concentration to more than 50%.
Device produced by above-mentioned processing nitrotoleune Waste Sulfuric Acid used in the juice circulation method of dust technology, including cooling
Device, automatic segregator, manual separation device, change hands groove, nitrogen oxide gas compressor group, nitrogen oxide absorption tower；
The cooler, automatic segregator, manual separation device, change hands groove, nitrogen oxide gas compressor group by liquid line according to
Secondary connection, the nitrogen oxide gas compressor group outlet line are divided into two-way, lead to nitrogen oxide absorption tower through gas line all the way, another
The two-way for being divided into parallel connection is continued on road by liquid line, and all the way towards automatic segregator, another way sets finished product discharge pipe, cooling
Active redundancy pipeline is provided between the liquid line in device exit and the liquid line in automatic segregator exit；
Low concentration dust technology coming expects pipe is connected in cooler inlet line, the cooler, automatic segregator, is divided manually
From device, change hands groove upper end and connected through gas line and merge, then with the nitrogen oxide gas discharge pipe of process upstream be merged into inlet gas
Phase pipe leads to nitrogen oxide gas compressor group；The discharge of the first nitrotoleune is respectively equipped with above the automatic segregator, manual separation device
Pipe, the second nitrotoleune discharge pipe；
Nitrogen oxide absorb the bottom of the tower is communicated to the liquid line changed hands between groove, nitrogen oxide gas compressor group by absorbing liquid discharging tube
Line.
Preferably, the cooler discharging opening and automatic segregator charging aperture, automatic segregator discharging opening and manual separation
Device charging aperture, manual separation device discharging opening are with changing hands groove charging aperture, changing hands groove discharging opening and nitrogen oxide gas compressor group charging aperture is equal
Connected by liquid line.
Preferably, in addition to control unit, the first densitometer, the nitrogen oxide gas compressor are provided with the automatic segregator
The liquid line all the way that group discharging opening leads to automatic segregator is provided with the first regulating valve, first densitometer and the first regulation
Valve is connected by DCS control systems.
Further, described change hands in groove is provided with first liquid level gauge, and described change hands is provided between groove and nitrogen oxide gas compressor group
First delivery pump, the first liquid level gauge are connected with the first delivery pump by DCS control systems；
Further, the finished product discharge pipe is provided with the second densitometer, and the nitrogen oxide on nitrogen oxide absorption tower absorbs water pipe
The 3rd regulating valve is provided with, second densitometer is connected with the 3rd regulating valve by DCS control systems.
Further, the absorbing liquid discharging tube is provided with the second regulating valve, and nitrogen oxide absorb the bottom of the tower is provided with the second liquid
Position meter, second regulating valve are connected with second liquid level gauge by DCS control systems.
Preferably, the nitrogen oxide absorption tower column plate outer wall sets column plate working solution delivery pipe, the column plate working solution row
Pipe is put to connect with manual separation device to the liquid line changed hands between groove.
Preferably, the row's steam condensate (SC) pipe for leading to sour water pond is connected with the low concentration dust technology coming expects pipe.
Beneficial effects of the present invention are：
1. 15%-40% low concentrations dust technology and the concentrated nitric acid of concentration 50% are mixed into 37%-40% dust technology, it is ensured that
Dust technology density is bigger than nitrotoleune all the time, then by gravity settling separation, solves the nitro that dissociates in 15%-40% dust technologies
The problem of toluene separation is difficult.
2. 15%-40% dust technology concentration is brought up into more than 50%, use value is improved, eliminates nitrogen oxide absorption
Tower driving and parking needs to produce a large amount of 30% low concentration dust technologies, it is necessary to the problems such as longer working time acid filling of flower prepares；Add
The economy of sulfur waste acid treatment device.
After 3. the oxidized nitrogen compressor set of nitrogen oxide, nitrogen oxide absorption tower absorb, tail gas reaches European emission standard discharge,
With it is environment-friendly the advantages of.
4. automaticity is high, pass through the dilute nitre finished acid Density Detection signal of nitrogen oxide gas compressor group 50%, adjustment oxidation
Nitrogen absorbing tower apical sink water, more than 50% dust technology for being stablized nitrogen oxide gas compressor group separator.
Brief description of the drawings
Fig. 1 is the juice circulation method use device schematic diagram of dust technology produced by present invention processing nitrotoleune Waste Sulfuric Acid
Wherein：1- cooler 2- automatic segregator 3- manual separation device 4- active redundancy pipelines 5- changes hands groove 6- nitrogen oxides
Compressor set 7- nitrogen oxides absorption tower 8- low concentration dust technology coming expects pipe 9- nitrogen oxide gas discharge pipe 10- import gas phase pipes
11- finished product discharge pipe 12- the first densitometer 13- the first regulating valve 14- first liquid level gauges the first delivery pumps of 15- 16- second
Densitometer 17- row's steam condensate (SC) pipe 18- first gas pipeline 19- second gas pipeline 20- third gas pipelines 21-
Service valve 22- gas pipelines merge the gas pipeline 6.1- nitrogen oxide gas compressor 6.2- separator 7.1- oxygen of section 5.1- the 4th
Change nitrogen and absorb water pipe 7.2- column plate working solution delivery pipe 7.3- vapor liquid equilibrium pipe 7.4- absorbing liquid discharging tube 7.5- tail gas row
Put the regulating valves of pipe 7.6- the second regulating valve 7.7- second liquid level gauges 7.8- the 3rd.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, the juice circulation method institute of dust technology produced by processing nitrotoleune Waste Sulfuric Acid provided by the invention
Device is, including cooler 1, automatic segregator 2, manual separation device 3, changes hands groove 5, nitrogen oxide gas compressor group 6, nitrogen oxide
Absorption tower 7 and liquid line and gas line；Nitrogen oxide gas compressor group 6 includes the preceding latter linked He of nitrogen oxide gas compressor 6.1
Separator 6.2.
Cooler 1, automatic segregator 2, manual separation device 3, change hands groove 5, nitrogen oxide gas compressor group 6 by liquid line according to
Secondary connection, the outlet line of nitrogen oxide gas compressor group 6 are divided into the two-way of parallel connection, lead to nitrogen oxide absorption tower 7 through gas line all the way,
Another way continues the two-way for being divided into parallel connection by liquid line, sets finished product discharge pipe towards automatic segregator 2, another way all the way
11, active redundancy pipeline 4 is provided between the liquid line in the exit of cooler 1 and the liquid line in the exit of automatic segregator 2；Low concentration
Dust technology coming expects pipe 8 is connected in the inlet line of cooler 1, and cooler 1, automatic segregator 2, the upper end of manual separation device 3 are through gas
Fluid line connection merges, then is merged into import gas phase pipe 10 with the nitrogen oxide gas discharge pipe 9 of process upstream and leads to nitrogen oxide pressure
Contracting unit 6.
It is specially in the present embodiment：The upper right side discharging opening of cooler 1 divides with the lower-left endfeed mouth of automatic segregator 2, automatically
From the lower right side discharging opening of device 2 and the bottom righthand side charging aperture of manual separation device 3, the upper right side discharging opening of manual separation device 3 and change hands on groove 5
Endfeed mouth, change hands the lower right side of groove 5 and the left side of the first delivery pump 15, the top of the first delivery pump 15 and the left side of nitrogen oxide gas compressor group 6
Side charging aperture is connected by liquid line, and the discharge outlet pipeline of 6 separator of nitrogen oxide gas compressor group 6.2 is divided into the gas-liquid of parallel connection
Two-way, leads to the bottom feed mouth of nitrogen oxide absorption tower 7 through gas line all the way, and another way is separated into the two of parallel connection through liquid line
Road, connected all the way with the discharge outlet liquid line of cooler 1, another way sets finished product discharge pipe 11.Automatic segregator 2, manually
The top of separator 3 is additionally provided with the special discharge line of the nitrotoleune discharge system of separation.The upper right side discharging opening of cooler 1 with
Active redundancy pipeline 4 between the liquid line of the lower-left endfeed mouth of automatic segregator 2 is provided with service valve 21, right with automatic segregator 2
Downside discharging opening is connected with the liquid line of the bottom righthand side charging aperture of manual separation device 3.Automatic segregator 2, the top of manual separation device 3
It is respectively equipped with the first nitrotoleune discharge pipe 2.1, the second nitrotoleune discharge pipe 3.1.The bottom of nitrogen oxide absorption tower 7 passes through absorption
Liquid discharging tube 7.4 is connected to the liquid line changed hands between groove 5, nitrogen oxide gas compressor group 6.
Present apparatus system also includes DCS control systems, and the first densitometer 12, nitrogen oxide compression are provided with automatic segregator 2
The liquid line all the way that the discharging opening of unit 6 leads to automatic segregator 2 is provided with the first regulating valve 13, the first densitometer 12 and first
Regulating valve 13 is connected by DCS control systems；Change hands in groove 5 and be provided with first liquid level gauge, change hands groove 5 and nitrogen oxide gas compressor group 10
Between be provided with the first delivery pump 15, first liquid level gauge is connected with the first delivery pump 15 by DCS control systems, and the first delivery pump 15 pushes up
Portion's liquid line is provided with flowmeter 15.1；Finished product discharge pipe 11 is provided with the second densitometer 16, the oxidation on nitrogen oxide absorption tower 7
Nitrogen absorbs water pipe 7.1 and is provided with the 3rd regulating valve 7.8, and the second densitometer 16 is connected with the 3rd regulating valve 7.8 by DCS control systems
Connect.Absorbing liquid discharging tube 7.4 is provided with the second regulating valve 7.6, and the bottom of nitrogen oxide absorption tower 7 is provided with second liquid level gauge 7.7, and second
Regulating valve 7.6 is connected with second liquid level gauge 7.7 by DCS control systems.
Gas line includes the first gas pipeline 18 of the top of cooler 1 setting, second that the top of automatic segregator 2 is set
The third gas pipeline 20 that gas pipeline 19, the top of manual separation device 3 are set, change hands the 4th gas pipeline of the top of groove 5 setting
5.1, first gas pipeline 18, second gas pipeline 19, third gas pipeline 20, the connection of the 4th gas pipeline 5.1, which merge, to be formed
Gas pipeline merges section 22, and gas pipeline merges section 22 and nitrogen oxide gas discharge pipe 9 is merged into import gas phase pipe 10 and leads to oxygen
Change nitrogen compressor set 6.The bottom of nitrogen oxide absorption tower 7 is connected to gas pipeline by absorbing liquid discharging tube 7.4 and merges section 22.This reality
Apply in example and be relatively large in diameter because gas pipeline merges section 22, therefore the liquid of nitrogen oxide gas compressor group 6 to be entered can be passed directly into
Gas pipeline merges section 22, then enters nitrogen oxide gas compressor group 6 by import gas phase pipe 10 together with nitrogen oxide gas, so as to inhale
Gas pipeline merging section 22 can be also passed directly into by receiving liquid discharging tube 7.4；Also can be directly by the liquid of nitrogen oxide gas compressor group 6 to be entered
Body enters nitrogen oxide gas compressor group 6 by fluid pipeline.
The column plate outer wall of nitrogen oxide absorption tower 7 sets column plate working solution delivery pipe 7.2, column plate working solution delivery pipe 7.2 and hand
Flow separator 3 to the liquid line changed hands between groove 5 connects.The row's steaming for leading to sour water pond is connected with low concentration dust technology coming expects pipe 8
Vapour condensate pipe 17.Nitrogen oxide absorption tower bubble cap plate cancels column plate discharge orifice, it is ensured that the tower in the case of any amount of water
Plate keeps full liquid level；The vapor liquid equilibrium pipe 7.3 at the top of nitrogen oxide absorption tower 7 ensures that nitrogen oxide absorption tower is surprisingly let out in certain layer of column plate
Full tower occurs without liquid flooding in the case of leakage, it is ensured that nitrogen oxide absorption tower continuous-stable works.Tail gas is set at the top of nitrogen oxide absorption tower
Delivery pipe 7.5.
By said apparatus system, the juice circulation method specific steps of dust technology produced by handling nitrotoleune Waste Sulfuric Acid
For：
Start-up：
Steam condensate (SC) caused by start-up flows out from low concentration dust technology coming expects pipe 8, by arranging steam condensate (SC) pipe
17 are discharged into acid waste water system i.e. sour water pond, and valve on steam condensate (SC) pipe 17 is arranged under system normal operation and is closed.
It is first drive or overhaul after start-up, it is relatively low to come from the dust technology concentration of separator 6.2, dilute without adjusting
The function of concentration of nitric acid, the valve 21 on active redundancy pipeline 4 is opened, the nitric acid that low concentration dust technology coming expects pipe 8 flows out, is directly entered
Manual separation nitrotoleune in manual separation device 3.The dust technology of concentration 50% is noted before driving in groove 5 is changed hands, as start-up
Concentration regulation start acid.DCS control systems are with the second densitometer 16 detection nitrogen oxide gas compressor group 6 on finished product discharge pipe 11
The nitric acid density of outflow is signal, and by controlling the aperture of the first delivery pump 15, control, which is changed hands, starts sour flow in groove 5, make startup
After acid is mixed into nitrogen oxide gas compressor group with 15%-40% low concentration dust technologies, concentration reaches more than 50%.
Production phase：
A. by the mass fraction 15%-40% low concentration dust technologies from low concentration dust technology coming expects pipe 8, through cooler 1
Heat transfer is cooled to 20 DEG C, promotes the solubility of dust technology para-nitrotoluene to decline.Mass fraction 15%-40% after cooling is low
Concentration dust technology adjusts concentration to 37%-40% with the concentrated nitric acid from the mass fraction more than 50% of nitrogen oxide gas compressor group 6 again,
This concentration is adjusted to density that DCS control systems are determined using the first densitometer 12 as signal, controls the aperture of the first regulating valve 13, adjusts
The whole flow for adding the concentrated nitric acid from the mass fraction more than 50% of nitrogen oxide gas compressor group 6, it is ensured that dust technology density after adjustment
All the time bigger than nitrotoleune, dust technology is heavy phase.
B. mixed nitrate passes in succession through automatic segregator 2, manual separation device 3 is isolated free nitrotoleune, then flow automatically
Enter to change hands groove 5.The gravitational settling of automatic segregator 2 continuously separates nitrotoleune, manual separation device 3 divides nitrotoleune interval
From, nitrotoleune from the special discharge line at automatic segregator 2, the top of manual separation device 3 (the first nitrotoleune discharge pipe 2.1,
Second nitrotoleune discharge pipe 3.1) give off system.Change hands groove 5 and remain the liquid level no more than highest liquid level 50%, DCS
The liquid level that control system is determined using first liquid level gauge 14 automatically controls the aperture of the first delivery pump 15 as signal, adjusts feed flow,
By unnecessary concentration 37%-40% dust technologies by being sent into the import gas phase of the import of nitrogen oxide gas compressor 6.1 through flowmeter 15.1
Pipe 10, concentration is improved to more than 50% by nitrogen oxide gas compressor group 6.
C. the nitric acid of concentration more than 50% part obtained continues and subsequently comes from sulfur waste acid treatment denitration condenser quality
Fraction 15%-40% low concentrations dust technology carries out step abc and forms circulation technology；Another part is discharged into finished product tank field.
D. nitrogen oxide gas caused by system intercooler 1 and nitrogen oxide caused by automatic segregator 2, manual separation device 3
Gas, change hands nitrogen oxide gas caused by groove 5 gas pipeline merge section 22 in merge, then with oxidized nitrogen discharge pipe 9
The Waste Sulfuric Acid denitration process of discharge produces nitrogen oxide gas and merged, and entering nitrogen oxide gas compressor group 6 through import gas phase pipe 10 absorbs,
6 unabsorbed nitrogen oxide gas of nitrogen oxide gas compressor group is passed through the bottom of nitrogen oxide absorption tower 7 after being come out from separator 6.2, with water
Counter-current absorption, produce 30% low concentration dust technology, the dilute nitre of concentration 37%-40% that the first delivery pump 15 conveys through flowmeter 15.1
Acid is mixed into working solution with 30% low concentration dust technology in absorbing liquid discharging tube 7.4 and adds nitrogen oxide gas compressor group 6；Tail gas reaches
European emission standard discharges, and is discharged from the tail gas discharging pipe 7.5 at top.DCS control systems are with second on finished product discharge pipe 11
The nitric acid density that densitometer 16 detects the outflow of nitrogen oxide gas compressor group 6 is signal, by controlling the aperture of the 3rd regulating valve 7.8, i.e.,
Nitrogen oxide absorbs the inflow of water pipe 7.1 (top of tower of nitrogen oxide absorption tower 7 absorbs water), makes nitrogen oxide gas compressor group separator
6.2 dust technologies of concentration more than 50% stablized.
E.DCS control systems pass through control using the measure liquid level of the bottom second liquid level gauge 7.7 of nitrogen oxide absorption tower 7 as signal
The aperture of the second regulating valve 7.6 is made, control merges into the absorption flow quantity of nitrogen oxide gas compressor group 6 with mixed nitrate in step b
Concentration is improved to more than 50% into nitrogen oxide gas compressor group, can also avoid the occurrence of flooding.
Delivery pump 15 is two, and one opens one standby, when production failure of pump, starts stand-by pump immediately, can fully ensure that system
Consecutive production.This method newly added equipment is few, formerly has nitrogen oxide to absorb and is arranged between Waste Sulfuric Acid treatment process, it is not necessary to
Newly-increased place is built.
Claims (6)
1. it is a kind of handle nitrotoleune Waste Sulfuric Acid produced by dust technology juice circulation method, it is characterised in that step is：
Start-up：
By the mass fraction 15%-40% low concentration dust technologies from Waste Sulfuric Acid processing denitration condenser, cool, gravity sinks
Drop isolates free nitrotoleune, controls as the nitric acid flow of concentration 50% for starting acid, makes startup acid low with 15%-40%
After concentration dust technology is mixed into nitrogen oxide gas compressor group, concentration reaches more than 50%；
Production phase：
A. the mass fraction 15%-40% low concentration dust technologies of denitration condenser will be handled from Waste Sulfuric Acid, cools, controls
After the nitric acid flow of nitrogen oxide gas compressor group mass fraction more than 50% makes it be mixed with 15%-40% low concentration dust technologies,
Density is more than nitrotoleune density；
B. gravity settling separation goes out the nitrotoleune to dissociate in mixed nitrate, will separate described in the mixed nitrate warp of nitrotoleune
Nitrogen oxide gas compressor group improves concentration to more than 50%；
C. the nitric acid of concentration more than 50% part and the mass fraction subsequently from sulfur waste acid treatment denitration condenser obtained
15%-40% low concentrations dust technology carries out step abc and forms circulation technology；Another part is discharged into finished product tank field；
D. caused nitrogen oxide gas merges with nitrogen oxide gas caused by Waste Sulfuric Acid denitration process in system, through the nitrogen oxide
Oxidized nitrogen absorption tower absorption discharge again after compressor absorbs；
E. in absorb the bottom of the tower absorbing liquid and step b mixed nitrate be combined into nitrogen oxide gas compressor group improve concentration to 50% with
On.
2. the juice circulation method of dust technology produced by processing nitrotoleune Waste Sulfuric Acid as claimed in claim 1, it is characterised in that：
The mixed nitrate that nitrotoleune was separated in step b enters back into nitrogen oxide gas compressor group through changing hands groove, by changing hands liquid level in groove
Mixed nitrate is controlled to enter the flow of nitrogen oxide gas compressor group.
3. the juice circulation method of dust technology produced by processing nitrotoleune Waste Sulfuric Acid as claimed in claim 1, it is characterised in that：
Step d is to merge separation process obtains in cooling procedure, step b in step a nitrogen oxide gas, then with Waste Sulfuric Acid denitration work
Nitrogen oxide gas caused by sequence merges, and oxidized nitrogen absorption tower absorbs discharge again after nitrogen oxide gas compressor absorption.
4. the juice circulation method of dust technology produced by processing nitrotoleune Waste Sulfuric Acid as claimed in claim 1, it is characterised in that：
Upper end inflow in the concentrated nitric acid density domination absorption tower exported in step d by nitrogen oxide gas compressor group.
5. the juice circulation method of dust technology produced by processing nitrotoleune Waste Sulfuric Acid as claimed in claim 1, it is characterised in that：
Enter the absorption flow quantity of nitrogen oxide gas compressor group in step d by absorb the bottom of the tower Liquid level.
6. the juice circulation method of dust technology produced by processing nitrotoleune Waste Sulfuric Acid as claimed in claim 1, it is characterised in that
Step is：
Start-up：
By the mass fraction 15%-40% low concentration dust technologies from Waste Sulfuric Acid processing denitration condenser, cool, gravity sinks
Drop isolates free nitrotoleune, control from changing hands in groove as the nitric acid flow of concentration 50% for starting acid, make startup acid and
After 15%-40% low concentration dust technologies are mixed into nitrogen oxide gas compressor group, concentration reaches more than 50%；
Production phase：
A. the mass fraction 15%-40% low concentration dust technologies of denitration condenser will be handled from Waste Sulfuric Acid, cools, controls
It is set to be mixed with 15%-40% low concentration dust technologies from the concentrated nitric acid flow of nitrogen oxide gas compressor group mass fraction more than 50%
Afterwards, density is more than nitrotoleune density；
B. mixed nitrate passes in succession through automatic segregator, manual separation device isolates free nitrotoleune, will separate nitro
The mixed nitrate of toluene is passed through the nitrogen oxide gas compressor group again through changing hands groove, concentration is improved to more than 50%, wherein by turning
Liquid level mixed nitrate enters the flow of nitrogen oxide gas compressor group in hand groove；
C. the nitric acid of concentration more than 50% part obtained is with subsequently coming from sulfur waste acid treatment denitration condenser mass fraction 15%-
40% low concentration dust technology carries out step abc and forms circulation technology；Another part is discharged into finished product tank field；
D. nitrogen oxide gas caused by system intercooler and automatic segregator, nitrogen oxide gas caused by manual separation device, turn
Caused by hand groove nitrogen oxide gas merge, then with Waste Sulfuric Acid denitration process caused by nitrogen oxide gas merge, through the nitrogen oxide
Oxidized nitrogen absorption tower absorption discharge again after compressor set absorbs；The concentrated nitric acid density domination exported by nitrogen oxide gas compressor group
Upper end inflow in absorption tower；
E. by its flow of absorb the bottom of the tower absorbing liquid Liquid level, nitrogen oxide compression is combined into mixed nitrate in step b
Unit improves concentration to more than 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711044153.6A CN107814365B (en) | 2017-10-31 | 2017-10-31 | Cyclic concentration method for treating dilute nitric acid generated by nitrotoluene waste sulfuric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711044153.6A CN107814365B (en) | 2017-10-31 | 2017-10-31 | Cyclic concentration method for treating dilute nitric acid generated by nitrotoluene waste sulfuric acid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107814365A true CN107814365A (en) | 2018-03-20 |
| CN107814365B CN107814365B (en) | 2020-04-28 |
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| CN109627170A (en) * | 2018-12-17 | 2019-04-16 | 湖北东方化工有限公司 | The method for extracting poly-nitro toluene from nitrotoleune acid waste water |
| CN111644019A (en) * | 2020-06-10 | 2020-09-11 | 湖北东方化工有限公司 | Production method of nitrogen oxide gas full-automatic pressure absorption process |
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| CN105366653A (en) * | 2014-08-25 | 2016-03-02 | 蒋小华 | Nitric acid production technology with double-pressurized method |
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