CN108658095A - The energy-saving reclaiming process and system that a kind of ammonium hydroxide recycling concentration is easily adjusted - Google Patents
The energy-saving reclaiming process and system that a kind of ammonium hydroxide recycling concentration is easily adjusted Download PDFInfo
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- CN108658095A CN108658095A CN201810862448.2A CN201810862448A CN108658095A CN 108658095 A CN108658095 A CN 108658095A CN 201810862448 A CN201810862448 A CN 201810862448A CN 108658095 A CN108658095 A CN 108658095A
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- Prior art keywords
- ammonia
- water
- ammonium hydroxide
- spray column
- spray
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/022—Preparation of aqueous ammonia solutions, i.e. ammonia water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
Abstract
The invention discloses the energy-saving reclaiming process that a kind of ammonium hydroxide recycling concentration is easily adjusted, and include the following steps：Step 1：Ammonia nitrogen waste water after being absorbed to liquid ammonia pollution using soft water is stripped to obtain ammonia steam and high temperature deamination water using steam；Step 2：The high temperature deamination water generated in step 1 is exchanged heat with the ammonia nitrogen waste water for entering step one, and for the absorption to liquid ammonia pollution in step 1 after the cooling of high temperature deamination water；Ammonia steam will be generated in step 1 condenses the isolated ammonia of laggard promoting the circulation of qi liquid and ammonium hydroxide；Step 3：Ammonium hydroxide is backed into step 1 in step 2 and continues to strip；Negative-pressure adsorption being formed with the water purification of circular flow being passed through by Venturi method to obtaining ammonia in step 2 mix, forming high concentration ammonium hydroxide, when remaining ammonia emission is absorbed using the concentrated sulfuric acid, and realization tail gas is up to standard；Realize that ammonium hydroxide recycles concentration and adjusts by adjusting water purification additive amount.
Description
Technical field
The present invention relates to ammonia exhaust gas processing technology field, specially a kind of energy saving recycling that ammonium hydroxide recycling concentration is easily adjusted
Technique and system.
Background technology
Many fields use liquefied ammonia as raw material and solvent in the industrial production, can be discharged during use extra liquefied ammonia and
Gas ammonia tail gas, these tail gas direct emissions pollute the environment, therefore liquid ammonia pollution needs to discharge after treatment.The prior art is all
It is to absorb ammonia by absorption tower to form low concentration ammonia-containing water, however ammonia-containing water is dealt with improperly and can still cause environment dirty
Dye.
Steam ammonia still process is generally passed through using steam stripping ammonia-removing tower in the recovery processing of ammonia-containing water, it is then cold by condenser
Solidifying recycling weak aqua ammonia controls reflux ratio to adjust the temperature of tower top, to ammonia concn needed for arrival, so steam consumption quantity is big
(120-150kg/ tons of water), while steam pressure is required also high (>=0.4MPa), when ammonia content is few in waste water, to need
Larger regurgitant volume makes system be not in Optimum Operation state, increases energy consumption, and is contained to control ammonia in steam by flowing back
Amount, control mode is unstable, due to being that ammonia steam condensate directly recycles ammonium hydroxide, when recycling 15% or less ammonia concn, and recycling
Rate is low, overflows ammonia taste weight, due to how much taking raw water boiling liquid (spume water in especially running) out of, can not ensure that ammonium hydroxide is pure
Degree.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of ammonium hydroxide energy-saving reclaiming process for easily adjusting of recycling concentration and
System solves Ammonia recovery ammonium hydroxide recycling concentration of giving up at present and is not easy to adjust, and energy consumption is big, and recycling ammonium hydroxide efficiency is low, concentration is low
Problem.
To achieve the above object, the present invention provides the following technical solutions：A kind of easily adjust energy saving time of ammonium hydroxide recycling concentration
Knock off skill, includes the following steps：
Step 1：Ammonia nitrogen waste water after being absorbed to liquid ammonia pollution using soft water is stripped to obtain ammonia using steam
Steam and high temperature deamination water；
Step 2：The high temperature deamination water generated in step 1 is exchanged heat with the ammonia nitrogen waste water for entering step one, and high
For the absorption to liquid ammonia pollution in step 1 after warm deamination water cooling；Laggard promoting the circulation of qi liquid is condensed by ammonia steam is generated in step 1
Isolated ammonia and ammonium hydroxide；
Step 3：Ammonium hydroxide is backed into step 1 in step 2 and continues to strip；Pass through to obtaining ammonia in step 2
Venturi method forms negative-pressure adsorption with the water purification of circular flow being passed through and mix, formation high concentration ammonium hydroxide, when remaining ammonia emission
It is absorbed using the concentrated sulfuric acid, realizes that tail gas is up to standard；Realize that ammonium hydroxide recycles concentration and adjusts by adjusting water purification additive amount.
Further, the ammonia that gives up is recycled to fully absorb, in the step 1, exhaust gas is inhaled by the first spray column
It receives, residual gas enters the second spray column, and the second spray column residual gas enters third spray column, and third spray column uses dense sulphur
Acid absorbs, and realizes that tail gas is up to standard；And first spray column shower water be the second spray column spray-absorption after ammonia nitrogen waste water.
Further, in order to reduce energy consumption, waste water boiling point is reduced, ammonia nitrogen is more easy to escape under negative pressure, and deamination water reaches direct
Discharge standard in the step 1, strips ammonia nitrogen waste water using low-pressure steam under subnormal ambient, step 3 Chinese mound
In the negative-pressure adsorption realized of method be mixed into step 1 air lift and form lasting subnormal ambient.
A kind of energy saving recovery system that ammonium hydroxide recycling concentration is easily adjusted, including intermediate fluid reservoir, steam stripping ammonia-removing tower, condensation
Device, further includes vapour liquid separator, Venturi tube, ammonium hydroxide case, and the intermediate fluid reservoir connects vapour by water pump, and by heat exchanger
Carry deammoniation tower water inlet, steam stripping ammonia-removing tower steam inlet steam-out (SO)；
Steam stripping ammonia-removing tower gas outlet is sequentially connected condenser and vapour liquid separator, and vapour liquid separator water outlet passes through reflux pump
Steam stripping ammonia-removing tower water inlet is accessed, vapour liquid separator gas outlet connects Venturi tube air inlet, and Venturi tube water outlet connects ammonia
Water tank inlet, ammonium hydroxide case water return outlet connect Venturi tube water inlet by water pump, and concentration detector, row are equipped in ammonium hydroxide case
The mouth of a river and water supplement port.
Further, it absorbs the ammonia that gives up and obtains ammonia waste water, and reuse has the deamination water of heat so as to energy saving, further includes spray
Absorption system is drenched, spray-absorption system bottom wastewater trough connects spray tube, and the bottom waste water of spray-absorption system by water pump
Slot connects intermediate fluid reservoir by water pump, and steam stripping ammonia-removing tower water return outlet passes sequentially through heat exchanger, deep freezer connection spray by water pump
Drench the bottom wastewater trough of absorption system.
In order to improve useless ammonia absorptivity, ammonia nitrogen concentration in ammonia nitrogen waste water is improved, the spray-absorption system is by the first spray
It drenches tower, the second spray column and third spray column to constitute, the bottom wastewater trough of respective bottom of tower connects respective spray by water pump
Pipe；
Useless ammonia air inlet pipe accesses the first spray column air inlet, and the first spray column exhaust outlet connects the second spray column air inlet,
Second spray column exhaust outlet connects third spray column air inlet；Third spray column is sprayed using the concentrated sulfuric acid；
The bottom wastewater trough of first spray column connects intermediate fluid reservoir, and the bottom wastewater trough of the first spray column by water pump
The bottom wastewater trough of the second spray column is connected by water pump, and steam stripping ammonia-removing tower water return outlet by water pump and is sequentially connected heat exchange
Device, deep freezer connect the bottom wastewater trough of the second spray column；Waste water is sprayed for the first spray column after second spray column absorbs, the
Waste water carries out being used for ammonia still process after one spray column absorbs, and the deamination water after exchanging heat is sprayed for the second spray column.
In order to reduce energy consumption, waste water boiling point is reduced, ammonia nitrogen is more easy to escape under negative pressure, and deamination water reaches direct emission standard,
The steam stripping ammonia-removing tower is negative pressure steam stripping ammonia-removing tower.
In order to extend waste water and steam time of contact, M type column plates are equipped in the steam stripping ammonia-removing tower.
For direct emission deamination water, the steam stripping ammonia-removing tower water return outlet is equipped with drainpipe.
For qualified discharge, the third spray column air inlet is also connect with the residual exhaust gases mouth of ammonium hydroxide box top.
Beneficial effects of the present invention：Ammonium hydroxide recycling concentration is easily adjusted, and without adjusting ammonia concn by return water, energy consumption is low, returns
Receive efficient ammonium hydroxide, recyclable high concentration ammonium hydroxide, deamination water containing ammonia nitrogen concentration is low can direct emission.
Description of the drawings
Fig. 1 is the principle of the present invention figure.
Specific implementation mode
As shown in Figure 1, a kind of energy-saving reclaiming process that ammonium hydroxide recycling concentration is easily adjusted and system, including spray-absorption system
1, intermediate fluid reservoir 2, steam stripping ammonia-removing tower 4, condenser 6, further include vapour liquid separator 7, Venturi tube 8, ammonium hydroxide case 9, the spray
The waste liquid outlet 101 of leaching absorption system 1 connects intermediate fluid reservoir 2, and intermediate fluid reservoir 2 is connected by water pump, and by heat exchanger 3
Steam stripping ammonia-removing tower water inlet 401,402 steam-out (SO) of steam stripping ammonia-removing tower steam inlet, steam stripping ammonia-removing tower water return outlet 403 pass through water pump
Pass sequentially through the spray water inlet 102 of heat exchanger 3, the connection spray-absorption of deep freezer 5 system 1；
Steam stripping ammonia-removing tower gas outlet 404 is sequentially connected condenser 6 and vapour liquid separator 7, and vapour liquid separator water outlet 701 is logical
Reflux pump access steam stripping ammonia-removing tower water inlet 401 is crossed, vapour liquid separator gas outlet 702 connects Venturi tube air inlet 801, literary mound
In pipe water outlet 802 connect ammonia water tank inlet 901, ammonium hydroxide case water return outlet 902 passes through water pump and connects Venturi tube water inlet
803, and concentration detector 903, discharge outlet 904 and water supplement port 905 are equipped in ammonium hydroxide case 9.
The spray-absorption system 1 is made of the first spray column 103, the second spray column 104 with third spray column 105, institute
Spray-absorption system 1 is stated to be made of with third spray column 105 the first spray column 103, the second spray column 104, respective bottom of tower
Bottom wastewater trough 101 connects respective spray tube 102 by water pump；
Useless ammonia air inlet pipe accesses the first spray column air inlet 106, the first spray column exhaust outlet 107 connect the second spray column into
Gas port 108, the second spray column exhaust outlet 109 connect third spray column air inlet 110；Third spray column 105 is sprayed using the concentrated sulfuric acid；
The bottom wastewater trough 101 of first spray column 103 connects intermediate fluid reservoir 2 by water pump, and the first spray column 103
Bottom wastewater trough 101 connects the bottom wastewater trough 101 of the second spray column 104 by water pump, and steam stripping ammonia-removing tower water return outlet 403 is logical
It crosses water pump and is sequentially connected heat exchanger 3, deep freezer 5 connects the bottom wastewater trough 101 of the second spray column 104；The stripping deamination
Tower 4 is negative pressure steam stripping ammonia-removing tower；The steam stripping ammonia-removing tower water return outlet 403 is equipped with drainpipe 404.
A kind of energy-saving reclaiming process that ammonium hydroxide recycling concentration is easily adjusted, includes the following steps：
Step 1：Ammonia nitrogen waste water after being absorbed to liquid ammonia pollution using soft water is steamed under subnormal ambient using low pressure
Vapour is stripped to obtain ammonia steam and high temperature deamination water；In the wherein described step 1, exhaust gas is absorbed by the first spray column,
Residual gas enters the second spray column, and the second spray column residual gas enters third spray column, and third spray column uses the concentrated sulfuric acid
It absorbs, realizes that tail gas is up to standard；And first spray column shower water be the second spray column spray-absorption after ammonia nitrogen waste water.
Step 2：The high temperature deamination water generated in step 1 is exchanged heat with the ammonia nitrogen waste water for entering step one, and high
For the absorption to liquid ammonia pollution in step 1 after warm deamination water cooling；Laggard promoting the circulation of qi liquid is condensed by ammonia steam is generated in step 1
Isolated ammonia and ammonium hydroxide；
Step 3：Ammonium hydroxide is backed into step 1 in step 2 and continues to strip；Pass through to obtaining ammonia in step 2
Venturi method forms negative-pressure adsorption with the water purification of circular flow being passed through and mix, formation high concentration ammonium hydroxide, when remaining ammonia emission
It is absorbed using the concentrated sulfuric acid, realizes that tail gas is up to standard, while lasting subnormal ambient is formed for step 1 air lift；Added by adjusting water purification
Dosage realizes that ammonium hydroxide recycling concentration is adjusted.
Detailed step is：The present invention, using after soft water absorption ammonia nitrogen exhaust gas, ammonia nitrogen waste water is pumped into negative by spray system 1
Pressure steam stripping ammonia-removing tower carries out deamination with low pressure steam contacts are passed through, and under subnormal ambient, reduces waste water boiling point, ammonia nitrogen is more easy to escape
Go out, effectively reduce required vapor (steam) temperature, reduce energy consumption so that deamination water meets qualified discharge standard containing ammonia nitrogen concentration is low；
Into before negative pressure steam stripping ammonia-removing tower, waste water exchanges heat with the deamination water after negative pressure steam stripping ammonia-removing tower ammonia still process in heat exchanger 3
Preheating is conducive to save energy consumption, while the deamination water after heat exchange sprays after deep freezer 5 further cooling for spray system 1
It absorbs the realization of ammonia nitrogen exhaust gas and recycles water resource.
And the ammonia steam of negative pressure steam stripping ammonia-removing tower output obtained after condenser condenses containing after ammonium hydroxide and ammonia through vapour-liquid
Separator 7 carries out gas-liquid separation, and the recovered negative pressure steam stripping ammonia-removing tower that is pumped into containing ammonium hydroxide continues deamination；
Vapour liquid separator gas outlet 702 connects Venturi tube air inlet 801, and ammonium hydroxide case 9 is supplemented only by water supplement port 905
Water, by water pump and with Venturi tube water outlet 802, venturi water inlet 803 formed circulating jet, to from Venturi tube into
Ammonia of the sucking of gas port 801 after the separation of vapour liquid separator 7, substitution air pump is energy saving, maintains negative pressure steam stripping ammonia-removing tower continuous negative pressure
Environment；Have simultaneously and is sufficiently mixed using ammonia and water purification, efficient, recycling concentration height, and then the concentration adjusting of ammonium hydroxide is to pass through
Water purification inflow controls, and easily adjusts.
Concentration detector 903 is set in ammonium hydroxide case 9, after meeting concentration requirement, ammonium hydroxide is discharged, fills into water purification again.For quilt
For the remaining ammonia that ammonium hydroxide case 9 recycles for qualified discharge, the third spray column air inlet 110 is also residual with 9 top of ammonium hydroxide case
Remaining exhaust outlet connection.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modification, equivalent replacement or improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (10)
1. a kind of energy-saving reclaiming process that ammonium hydroxide recycling concentration is easily adjusted, which is characterized in that include the following steps：
Step 1：Ammonia nitrogen waste water after being absorbed to liquid ammonia pollution using soft water is stripped to obtain ammonia steam using steam
With high temperature deamination water；
Step 2：The high temperature deamination water generated in step 1 is exchanged heat with the ammonia nitrogen waste water for entering step one, and high temperature is de-
For the absorption to liquid ammonia pollution in step 1 after ammonium hydroxide cooling；Gas-liquid separation is carried out after the condensation of ammonia steam being generated in step 1
Obtain ammonia and ammonium hydroxide；
Step 3：Ammonium hydroxide is backed into step 1 in step 2 and continues to strip；Pass through literary mound to obtaining ammonia in step 2
In method form negative-pressure adsorption with the water purification of circular flow being passed through and mix, formation high concentration ammonium hydroxide, when remaining ammonia emission, uses
The concentrated sulfuric acid absorbs, and realizes that tail gas is up to standard；Realize that ammonium hydroxide recycles concentration and adjusts by adjusting water purification additive amount.
2. a kind of energy-saving reclaiming process that ammonium hydroxide recycling concentration is easily adjusted according to claim 1, which is characterized in that the step
In rapid one, exhaust gas is absorbed by the first spray column, residual gas enter the second spray column, the second spray column residual gas into
Enter third spray column, third spray column is absorbed using the concentrated sulfuric acid, realizes that tail gas is up to standard；And first spray column shower water be second spray
Drench the ammonia nitrogen waste water after tower spray-absorption.
3. a kind of energy-saving reclaiming process that ammonium hydroxide recycling concentration is easily adjusted according to claim 1, which is characterized in that the step
In rapid one, ammonia nitrogen waste water is stripped using low-pressure steam under subnormal ambient, the negative pressure that Venturi method is realized in step 3
Absorption is mixed into step 1 air lift and forms lasting subnormal ambient.
4. the energy saving recovery system that a kind of ammonium hydroxide recycling concentration is easily adjusted, including it is intermediate fluid reservoir (2), steam stripping ammonia-removing tower (4), cold
Condenser (6), which is characterized in that further include vapour liquid separator (7), Venturi tube (8), ammonium hydroxide case (9), the intermediate fluid reservoir
(2) by water pump and by heat exchanger (3) connect steam stripping ammonia-removing tower water inlet (401), steam stripping ammonia-removing tower steam inlet (402) outside
Connect steam；
Steam stripping ammonia-removing tower gas outlet (404) is sequentially connected condenser (6) and vapour liquid separator (7), vapour liquid separator water outlet
(701) by reflux pump access steam stripping ammonia-removing tower water inlet (401), vapour liquid separator gas outlet (702) connect Venturi tube into
Gas port (801), Venturi tube water outlet (802) connect ammonia water tank inlet (901), and ammonium hydroxide case water return outlet (902) passes through water pump
Venturi tube water inlet (803) is connected, and is equipped with concentration detector (903), discharge outlet (904) and water supplement port in ammonium hydroxide case (9)
(905)。
5. a kind of energy saving recovery system that ammonium hydroxide recycling concentration is easily adjusted according to claim 4, which is characterized in that further include
Spray-absorption system (1), spray-absorption system (1) bottom wastewater trough (101) connects spray tube (102) by water pump, and sprays
The bottom wastewater trough (101) of absorption system (1) connects intermediate fluid reservoir (2) by water pump, and steam stripping ammonia-removing tower water return outlet (403) is logical
Cross the bottom wastewater trough (101) that water pump passes sequentially through heat exchanger (3), deep freezer (5) connects spray-absorption system (1).
6. a kind of energy saving recovery system that ammonium hydroxide recycling concentration is easily adjusted according to claim 5, which is characterized in that the spray
Leaching absorption system (1) is made of the first spray column (103), the second spray column (104) and third spray column (105), respective tower
The bottom wastewater trough (101) at bottom connects respective spray tube (102) by water pump；
Useless ammonia air inlet pipe accesses the first spray column air inlet (106), the first spray column exhaust outlet (107) connect the second spray column into
Gas port (108), the second spray column exhaust outlet (109) connect third spray column air inlet (110)；Third spray column (105) is using dense
Sulfuric acid sprays；
The bottom wastewater trough (101) of first spray column (103) connects intermediate fluid reservoir (2), and the first spray column by water pump
(103) bottom wastewater trough (101) connects the bottom wastewater trough (101) of the second spray column (104) by water pump, and strips deamination
Tower water return outlet (403) by water pump and be sequentially connected heat exchanger (3), deep freezer (5) connect the second spray column (104) bottom it is useless
Sink (101).
7. a kind of energy saving recovery system that ammonium hydroxide recycling concentration is easily adjusted according to claim 4, which is characterized in that the vapour
It is negative pressure steam stripping ammonia-removing tower to carry deammoniation tower (4).
8. a kind of energy saving recovery system of useless ammonia according to claim 4, which is characterized in that the steam stripping ammonia-removing tower (4)
It is interior to be equipped with M type column plates.
9. a kind of energy saving recovery system that ammonium hydroxide recycling concentration is easily adjusted according to claim 5, which is characterized in that the vapour
It carries deammoniation tower water return outlet (403) and is equipped with drainpipe (404).
10. a kind of energy saving recovery system that ammonium hydroxide recycling concentration is easily adjusted according to claim 6, which is characterized in that described
Third spray column air inlet (110) is also connect with the residual exhaust gases mouth at the top of ammonium hydroxide case (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810862448.2A CN108658095A (en) | 2018-08-01 | 2018-08-01 | The energy-saving reclaiming process and system that a kind of ammonium hydroxide recycling concentration is easily adjusted |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810862448.2A CN108658095A (en) | 2018-08-01 | 2018-08-01 | The energy-saving reclaiming process and system that a kind of ammonium hydroxide recycling concentration is easily adjusted |
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| Publication Number | Publication Date |
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| CN108658095A true CN108658095A (en) | 2018-10-16 |
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ID=63788317
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810862448.2A Pending CN108658095A (en) | 2018-08-01 | 2018-08-01 | The energy-saving reclaiming process and system that a kind of ammonium hydroxide recycling concentration is easily adjusted |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110575744A (en) * | 2019-10-09 | 2019-12-17 | 江苏沃德凯环保科技有限公司 | Special fabric ammonia-containing waste gas circulating purification and recovery process |
| CN112499710A (en) * | 2020-10-20 | 2021-03-16 | 阮氏化工（常熟）有限公司 | Device and method for purifying ammonia water by using ammonia-containing wastewater |
| CN114230071A (en) * | 2021-11-26 | 2022-03-25 | 安徽金禾实业股份有限公司 | Treatment method of DMF (dimethyl formamide) -containing wastewater |
-
2018
- 2018-08-01 CN CN201810862448.2A patent/CN108658095A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110575744A (en) * | 2019-10-09 | 2019-12-17 | 江苏沃德凯环保科技有限公司 | Special fabric ammonia-containing waste gas circulating purification and recovery process |
| CN112499710A (en) * | 2020-10-20 | 2021-03-16 | 阮氏化工（常熟）有限公司 | Device and method for purifying ammonia water by using ammonia-containing wastewater |
| CN112499710B (en) * | 2020-10-20 | 2023-01-24 | 阮氏化工（常熟）有限公司 | Device and method for purifying ammonia water by using ammonia-containing wastewater |
| CN114230071A (en) * | 2021-11-26 | 2022-03-25 | 安徽金禾实业股份有限公司 | Treatment method of DMF (dimethyl formamide) -containing wastewater |
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