CN218810377U - Production system for improving quality of sodium nitrate - Google Patents
Production system for improving quality of sodium nitrate Download PDFInfo
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- CN218810377U CN218810377U CN202222982656.0U CN202222982656U CN218810377U CN 218810377 U CN218810377 U CN 218810377U CN 202222982656 U CN202222982656 U CN 202222982656U CN 218810377 U CN218810377 U CN 218810377U
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- 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
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Abstract
The utility model discloses a promote production system of sodium nitrate quality, including raw material heater, pre-distillation tower and converter, the sodium nitrate inlet pipe is connected to the raw material heater feed inlet, and the discharge gate passes through pipe connection to the pre-distillation tower, and the gas phase exit linkage of pre-distillation tower top is to the condenser, and the gas phase exit linkage of condenser is to vapour and liquid separator, and the liquid phase exit linkage is to the condensate collection tank, and the liquid phase exit linkage of pre-distillation tower is to the converter, and converter bottom lower part still is equipped with the compressed air entry. According to the system, the raw material liquid is subjected to a pretreatment process, a raw material heating process and a pre-distillation process, and then enters a conversion process to be converted and other processes to obtain an industrial-grade sodium nitrate product (which implements the GB/T4553-2016 standard), so that the content of nitrogen oxide in the raw material liquid can be reduced, and the quality of sodium nitrate is improved.
Description
Technical Field
The utility model relates to a sodium nitrate preparation technical field relates to a promote production system of sodium nitrate quality.
Background
Sodium nitrate is a white to yellow crystalline solid powder that is very soluble in water, absorbs heat when dissolved in water, the solution cools, and the aqueous solution is neutral. The sodium nitrate has wide application, and is related to the aspects of enamel industry, mechanical industry, metallurgical industry, medical industry, light industry, fertilizer industry and the like, such as enamel powder preparation; as a metal cleaner; used as heat treatment agent for steel making and aluminum alloy; as a medium for penicillin; used as a quick-acting fertilizer for acid soil, etc. In addition, the electroplating grade or chemically pure sodium nitrate can be used for adding electroplating black chromium, can also be used in an electrolyte for plating the black chromium, and can be used in low chromic acid passivation, zinc dipping and oxidation solution of magnesium and magnesium alloy of a zinc coating.
At present, the common domestic methods for producing sodium nitrate comprise: firstly, sodium nitrate is produced by using sodium hydroxide and dilute nitric acid as raw materials; secondly, dilute nitric acid and sodium oxide are used as raw materials to produce sodium nitrate; thirdly, sodium carbonate and dilute nitric acid are used as raw materials to produce sodium nitrate; fourthly, sodium chloride and silver nitrate are used as raw materials to produce sodium nitrate. If the cost for preparing the sodium nitrate by using high-purity raw materials is high, the sodium nitrate is generally produced as a byproduct of some processes, partial impurities are contained and need to be removed, and the quality of the sodium nitrate is improved by selecting a proper impurity removal process, so that new impurities are prevented from being introduced.
Disclosure of Invention
The utility model provides a promote production system of sodium nitrate quality is through the purification of the rare sodium nitrate solution edulcoration to containing impurity for produce industrial-grade sodium nitrate, can also send the compressed air aeration to the tail gas treatment for the acid gas that contains in the nitric oxide gas that produces in the conversion tower and the raw materials liquid simultaneously, reduce the content of nitric oxide, promote the quality of sodium nitrate.
The utility model provides a technical scheme who takes, a promote production system of sodium nitrate quality, including raw material heater, pre-distillation tower and converter, the sodium nitrate inlet pipe is connected to the raw material heater feed inlet, and the discharge gate passes through pipe connection to the pre-distillation tower, and pre-distillation tower top gas phase exit linkage to condenser, the gas phase exit linkage of condenser to vapour and liquid separator, and liquid phase exit linkage to condensate collection tank, the liquid phase exit linkage of pre-distillation tower to the converter, converter bottom lower part still is equipped with the compressed air entry.
Furthermore, a flow meter is arranged on the sodium nitrate feeding pipe.
Furthermore, a circulation loop is arranged on the outer side of the lower part of the pre-distillation tower through a circulation pump, a reboiler and a pipeline.
Further, a part of the condenser condensate is refluxed to the preliminary distillation column through a pipe, and the other part is connected to a condensate collection tank through a pipe.
Furthermore, a discharge port of the condensate collecting tank is connected to a condensate water tank, and the condensate water tank is connected with a feeding port of the pre-distillation tower through pumping.
Further, the top of the gas-liquid separator is provided with a gas outlet and a vacuum pump.
Further, a gas phase outlet is arranged at the top of the conversion tower and connected to a tail gas treatment link.
The utility model discloses following beneficial effect has:
the system can adopt a dilute sodium nitrate solution with the mass fraction of about 30 percent as a raw material liquid to prepare industrial sodium nitrate, the content of sodium nitrite and nitric acid in the dilute sodium nitrate solution needs to be converted into sodium nitrate, and in the conversion process, both acid gas and nitric oxide can influence the product quality and yield. The system can discharge acid gas and nitric oxide gas generated by conversion through the arrangement of the pre-distillation tower and the conversion tower, reduce the content of nitric oxide in feed liquid and improve the quality of sodium nitrate; meanwhile, for timely condensation and separation of the gas phase, a small part of sodium nitrate solution taken away by the gas phase can be recovered, the waste of raw materials is reduced, and the production cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of the system provided by the present invention.
1: a flow meter; 2: a raw material heater; 3: a preliminary distillation column; 4: a delivery pump; 5, a conversion tower; 6: a circulation pump; 7: a reboiler; 8: a condenser; 9: a gas-liquid separator; 10. vacuum pump, 11: a condensate collection tank; 12: condensate tank, 13 and a feed supplement pump.
Detailed Description
The present invention will be further explained with reference to the following examples and drawings.
Promote production system of sodium nitrate quality, as shown in fig. 1, including raw materials heater 2, pre-distillation tower 3 and converter 5, the sodium nitrate inlet pipe is connected to raw materials heater 2 feed inlet, the discharge gate passes through pipe connection to pre-distillation tower 3, pre-distillation tower top gas phase exit linkage to condenser 8, condenser 8's gas phase exit linkage to vapour and liquid separator 9, liquid phase exit linkage to condensate collection tank 11, pre-distillation tower 3's liquid phase exit linkage to converter 5, converter bottom lower part still is equipped with compressed air entry.
In a preferred scheme, a flow meter 1 is arranged on the sodium nitrate feeding pipe. Dilute sodium nitrate solution with the concentration of about 30 percent is taken as raw material liquid, and the raw material liquid also contains sodium nitrite and nitric acid, and the PH value is 2-4. The raw material liquid is metered by a flowmeter and then enters a raw material heater for heating. The raw material heater adopts steam condensate or low-pressure steam for heat supply, and the temperature of the raw material liquid is heated from about 50 ℃ to about 90-120 ℃. And (4) feeding the heated raw material liquid to a pre-distillation tower in a middle feeding mode for flash evaporation.
In a preferred embodiment, a circulation circuit is provided outside the lower part of the preliminary distillation column 3 via a circulation pump 6, a reboiler 7, and piping. The tower is in a negative pressure environment, the temperature is about 70 ℃, steam of 0.8MPa is adopted for heating, and the raw material liquid entering the tower is concentrated for the first time. When the concentration of the solution is between 40 and 45 percent, the solution is pumped into the upper part of the conversion tower 5 through the delivery pump 4. In a further preferable scheme, a wire mesh demister can be arranged at the top of the pre-distillation tower to capture liquid carried in a gas phase.
In a preferred embodiment, a part of the condensate of the condenser 8 is returned to the preliminary distillation column 3 via a pipe, and the other part is connected to a condensate collecting tank 11 via a pipe, which receives mainly waste water containing sodium nitrate. The discharge hole of the condensate collecting tank 11 is connected to a condensate water tank 12, and the condensate water tank 12 is connected with the feed supplement hole of the pre-distillation tower 3 through pumping. The temperature of the condensate water tank is about 35 DEG C
The gas phase at the top of the pre-distillation tower enters a condenser at the top for cooling, the medium of the condenser is circulating water or low-temperature water, part of the gas phase is cooled into a liquid phase and flows back to the tower plate, and the gas phase which is not cooled down and a small amount of liquid phase containing the gas phase are sent to a gas-liquid separator 9. The outlet temperature of the condenser is about 35 ℃.
Preferably, the top of the gas-liquid separator 9 is provided with a gas phase outlet and a vacuum pump. The gas phase separated by the gas-liquid separator is pumped out by a vacuum pump, and the vacuum degree of the pre-distillation tower is maintained. And (3) sending the separated liquid phase to a condensate receiving tank, sending the condensate to a condensate water tank after the condensate reaches a certain height, and pumping the condensate containing sodium nitrate in the condensate water tank back to the pre-distillation tower to supplement the solution for the pre-distillation tower so as to prevent evaporation.
The top of the conversion tower 5 is provided with a gas phase outlet which is connected to the tail gas treatment link. Compressed air enters the conversion tower 5 from the bottom, NO dissolved in the compressed air is blown off, and the NO and acid gas originally contained in the raw material are discharged from the top of the tower and sent to a tail gas treatment system. The content of nitric oxide in the sodium nitrate is reduced, so that the quality of the sodium nitrate is improved, and the produced industrial-grade sodium nitrate meets the standard.
The system mainly improves the quality of the sodium nitrate through a raw material heating process, a pre-distillation process, a conversion process and gas phase treatment of a pre-distillation and conversion tower.
Claims (7)
1. The utility model provides a production system of promotion sodium nitrate quality which characterized in that: including raw materials heater (2), distillation column (3) and converter (5) in advance, the sodium nitrate inlet pipe is connected to raw materials heater (2) feed inlet, the discharge gate passes through pipe connection to distillation column (3) in advance, distillation column top gas phase exit linkage to condenser (8) in advance, the gas phase exit linkage of condenser (8) to vapour and liquid separator (9), liquid phase exit linkage to condensate collection tank (11), the liquid phase exit linkage of distillation column (3) in advance to converter (5), converter bottom lower part still is equipped with compressed air entry.
2. The system of claim 1, wherein: a flow meter (1) is arranged on the sodium nitrate feeding pipe.
3. The system of claim 1, wherein: the outer side of the lower part of the pre-distillation tower (3) is provided with a circulating loop through a circulating pump (6), a reboiler (7) and a pipeline.
4. The system of claim 1, wherein: one part of the condensate of the condenser (8) is refluxed to the pre-distillation tower (3) through a pipeline, and the other part of the condensate is connected to a condensate collecting tank (11) through a pipeline.
5. The system of claim 1, wherein: the discharge hole of the condensate collecting tank (11) is connected to a condensate water tank (12), and the condensate water tank (12) is connected with the feed supplement hole of the pre-distillation tower (3) through pumping.
6. The system of claim 1, wherein: the top of the gas-liquid separator (9) is provided with a gas-phase outlet and a vacuum pump.
7. The system of claim 1, wherein: the top of the conversion tower (5) is provided with a gas phase outlet which is connected to the tail gas treatment link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222982656.0U CN218810377U (en) | 2022-11-09 | 2022-11-09 | Production system for improving quality of sodium nitrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222982656.0U CN218810377U (en) | 2022-11-09 | 2022-11-09 | Production system for improving quality of sodium nitrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218810377U true CN218810377U (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222982656.0U Active CN218810377U (en) | 2022-11-09 | 2022-11-09 | Production system for improving quality of sodium nitrate |
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| Country | Link |
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| CN (1) | CN218810377U (en) |
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2022
- 2022-11-09 CN CN202222982656.0U patent/CN218810377U/en active Active
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