CN210251260U

CN210251260U - Concentrated nitric acid dilution system

Info

Publication number: CN210251260U
Application number: CN201920702271.XU
Authority: CN
Inventors: 周洋
Original assignee: Chongqing Jiangchuan Chemical Group Co ltd
Current assignee: Chongqing Jiangchuan Chemical Group Co ltd
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2020-04-07
Anticipated expiration: 2029-05-16

Abstract

The utility model discloses a concentrated nitric acid dilution system, including the elevated tank, the elevated tank is connected with a plurality of distillation columns, and is a plurality of the distillation column is connected with the condenser, the condenser is connected with the finished product jar be provided with between condenser and the finished product jar and thoughtlessly fail the device, thoughtlessly fail device and absorption tank. The utility model discloses a concentrated nitric acid dilution system has promoted the precision of diluting the concentration.

Description

Concentrated nitric acid dilution system

Technical Field

The utility model relates to a chemical production field especially relates to a concentrated nitric acid dilution system.

Background

Nitric acid is used as an important chemical raw material and is widely applied in chemical production, commercial nitric acid for industrial use is concentrated nitric acid with the concentration of 86-98%, but the concentrated nitric acid cannot be directly used in industrial application, and the concentrated nitric acid can be diluted and then used. The concentrated nitric acid dilution process is a mixing process of concentrated nitric acid and water, and because of the strong corrosivity of nitric acid and the problem that a large amount of acid mist and the like can be generated in the dilution process, if the dilution is not standardized enough, danger can also occur, so the requirement on mixing equipment in the dilution process of the concentrated nitric acid is very high, the effect of the traditional mixing equipment is not good enough, the preparation process is not well controlled, and meanwhile, the error between the concentration of the prepared dilute nitric acid and the required concentration is too large, and the precision is not high.

Those skilled in the art have therefore endeavored to develop a concentrated nitric acid dilution system that improves the accuracy of the diluted concentration.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide a concentrated nitric acid dilution system that promotes the precision of diluting the concentration.

In order to realize the above object, the utility model provides a concentrated nitric acid dilution system, including the elevated tank, the elevated tank is connected with a plurality of distillation columns, and is a plurality of the distillation column is connected with the condenser, the condenser is connected with the finished product jar be provided with the defeated device of mixing between condenser and the finished product jar, defeated device of mixing and absorption tank.

Preferably, the number of distillation columns is 40 to 60.

Preferably, the lower end of the distillation column is provided with a discharge pipeline.

Preferably, the mixed transportation device comprises a first flask, a second flask and an acid-resistant mixed transportation pump, wherein a feeding port of the first flask is connected with a discharging port of the condenser, a discharging port of the first flask is connected with a feeding port of the acid-resistant mixed transportation pump, a first discharging port of the second flask is connected with a feeding port of the acid-resistant mixed transportation pump, a second discharging port of the second flask is connected with a feeding port of the finished product tank, and a pipeline between the feeding port of the finished product tank and the second discharging port of the second flask is provided with a liquid flow regulating valve; the discharge port of the acid-proof mixing and conveying pump is connected with the feeding port of the second flask, and the air inlet of the absorption tank is connected with the air outlet of the second flask.

Preferably, a liquid flow regulating valve is arranged on a pipeline between the first discharge port of the second flask and the feeding port of the acid-resistant mixing and conveying pump; and a liquid flow regulating valve is arranged on a pipeline between the discharge hole of the first flask and the feeding hole of the acid-proof mixing and conveying pump.

Preferably, a switch valve is arranged on a pipeline between the air inlet of the absorption tank and the air outlet of the second flask.

Preferably, the second flask is further provided with a water inlet.

Preferably, a heating component is arranged in the distillation column, and a temperature detector is arranged on the distillation column.

Preferably, a circulating water jacket is arranged on the surface of the distillation column, and a water inlet and a water outlet on the circulating water jacket are respectively connected with the first circulating water upper water pipe and the first circulating water return pipe.

The utility model has the advantages that: the concentrated nitric acid diluting system has simple structure, the industrial concentrated nitric acid is purified and condensed and then is uniformly mixed with pure water according to a certain proportion, and the prepared dilute nitric acid has high concentration precision; the liquid conveying in the whole preparation process is subjected to flow control and temperature control, and the controllability is strong and the safety is higher.

Drawings

Fig. 1 is a schematic structural diagram of a concentrated nitric acid diluting system according to an embodiment of the present invention.

Detailed Description

The invention will be further explained with reference to the following figures and examples:

as shown in figure 1, the embodiment of the utility model discloses concentrated nitric acid dilution system, including elevated tank 1, elevated tank 1 is connected with a plurality of distillation columns 2, and a plurality of distillation columns 2 are connected with condenser 3, and condenser 3 is connected with finished product jar 4, is provided with between condenser 3 and finished product jar 4 and thoughtlessly defeated device 5, thoughtlessly defeated device 5 and absorption tank 6. The lower end of the distillation column 2 is provided with a discharge pipe 2b which is normally closed and opened to discharge the contents of the column from the discharge pipe when the contents of the column are to be cleaned. The number of distillation columns 2 is 40-60, which can satisfy the amount of industrial reagent for producing dilute nitric acid each time. In other embodiments, the number of distillation columns 2 is 50 or 70 or other values, and is not limited herein. The number of distillation columns is set according to the quality of the concentrated nitric acid that is desired to be processed. Be provided with second circulating water upper water pipeline 3a and second circulating water return water pipeline 3b on condenser 3, the condensing temperature of control condenser not only can liquefy the concentrated nitric acid of gasification, and the temperature that can also reduce concentrated nitric acid of needs helps when mixing with the pure water, and the temperature of release is too high to lead to the unstable decomposition of concentrated nitric acid.

In this embodiment, a heating unit 10 is provided in the distillation column 2, and a temperature detector 14 is provided on the distillation column 2. Heating element is used for heating the distillation to concentrated nitric acid, detects the distillated temperature through thermodetector, and then control heating temperature for concentrated nitric acid can turn into concentrated nitric acid steam, because the gasification temperature of concentrated nitric acid is less than the gasification temperature of water, consequently the concentration of the concentrated nitric acid after the distillation through distillation column is purer, cools off concentrated nitric acid steam through the condenser.

In this embodiment, a circulating water jacket 2a is disposed on the surface of the distillation column 2, and a water inlet and a water outlet of the circulating water jacket 2a are respectively connected to the first circulating water upper water pipe 12 and the first circulating water return pipe 13. The circulating water jacket is used for controlling the heating temperature, and when the temperature displayed by the temperature detector is too high, the circulating water in the circulating water jacket is cooled, so that the temperature can be kept at the stable heating temperature all the time.

In this embodiment, the mixing and conveying device 5 comprises a first flask 7, a second flask 8 and an acid-resistant mixing and conveying pump 11, a feeding port of the first flask 7 is connected with a discharging port of the condenser 3, a discharging port of the first flask 7 is connected with a feeding port of the acid-resistant mixing and conveying pump 11, a first discharging port 8a of the second flask 8 is connected with a feeding port of the acid-resistant mixing and conveying pump 11, a second discharging port 8b of the second flask 8 is connected with a feeding port of the finished product tank 4, and a pipeline between the feeding port of the finished product tank 4 and the second discharging port 8b of the second flask 8 is provided with a liquid flow regulating valve; the discharge port of the acid-proof mixing and conveying pump 11 is connected with the feeding port 8c of the second flask 8, and the air inlet of the absorption tank 6 is connected with the air outlet 8d of the second flask 8. The acid-proof mixed delivery pump is made of an acid-proof material, so that the corrosion of nitric acid to the pump is prevented, and the acid-proof mixed delivery pump can be a three-screw pump or other mixed delivery pumps, and is not limited herein. The acid-resistant mixing and conveying pump is used for uniformly mixing and conveying the distilled concentrated nitric acid and water in the acid-resistant mixing and conveying pump. The second flask 8 is also provided with a water inlet for adding water to the second flask.

In this embodiment, a liquid flow regulating valve is arranged on a pipeline between the first discharge port 8a of the second flask 8 and the feeding port of the acid-proof mixing and conveying pump 11; a liquid flow regulating valve is arranged on a pipeline between the discharge hole of the first flask 7 and the feeding hole of the acid-proof mixing and conveying pump 11, and the liquid flow regulating valve is a switch for controlling the flow and opening and closing of the pipeline liquid. And a switch valve is arranged on a pipeline between the gas inlet of the absorption tank 6 and the gas outlet 8d of the second flask 8 and used for controlling whether gas is introduced into the absorption tank or not. The water inlet of the second flask 8 is connected with a pure water input pipeline, and a liquid flow regulating valve is arranged on the pure water input pipeline. The pipelines between the elevated tank 1 and the plurality of distillation columns 2 are provided with liquid flow regulating valves.

The utility model discloses a concentrated nitric acid dilution system, entire system needs to prepare dilute nitric acid under the vacuum condition, confirm the volume of industry concentrated nitric acid and the volume of pure water according to the concentration and the volume of preparing dilute nitric acid earlier, to the industry concentrated nitric acid of the required volume of overhead tank splendid attire, control the liquid flow control valve between overhead tank and a plurality of distillation columns, industry concentrated nitric acid reposition of redundant personnel gets into a plurality of distillation columns, heat the distillation columns and distill, make the solute in the industry concentrated nitric acid become concentrated nitric acid gas and get into the condenser pipe and cool off for liquid concentrated nitric acid, liquid concentrated nitric acid after the cooling gets into in the first flask, to the pure water of the required volume of splendid attire in the second flask, industry concentrated nitric acid distillation finishes the back, open the liquid flow control valve between first flask and the acidproof thoughtlessly defeated pump of opening, open the liquid flow valve between second flask and the acidproof thoughtlessly defeated pump, and open the ooff valve, pure water and distilled concentrated nitric acid enter an acid-resistant mixing pump to be uniformly mixed and are transported to a second flask, gas generated in the preparation process is chemically absorbed by an absorption tank, at the moment, mixed dilute nitric acid is contained in the second flask, a liquid flow regulating valve between the second flask and a finished product tank is opened, and the dilute nitric acid in the second flask flows out to the finished product tank to be stored. During the operation, the flow ratio of the distilled concentrated nitric acid and the pure water can be set to control the mixing ratio of the pure water and the distilled concentrated nitric acid, for example, the flow ratio of the pure water can be increased, for example, the flow ratio of 2 parts of the pure water and the flow ratio of 1 part of the concentrated nitric acid are mixed in an acid-proof mixing pump until the concentrated nitric acid is completely flowed out, and in order to mix the dilute nitric acid in the second flask more uniformly, the dilute nitric acid in the second flask can be mixed more uniformly through the acid-proof mixing pump.

The concentrated nitric acid diluting system has simple structure, the industrial concentrated nitric acid is purified and condensed and then is uniformly mixed with pure water according to a certain proportion, and the prepared dilute nitric acid has high concentration precision; the liquid conveying in the whole preparation process is subjected to flow control and temperature control, and the controllability is strong and the safety is higher.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A concentrated nitric acid diluting system is characterized in that: including elevated tank (1), elevated tank (1) is connected, a plurality of with a plurality of distillation columns (2) distillation column (2) are connected with condenser (3), condenser (3) are connected with finished product jar (4) be provided with between condenser (3) and finished product jar (4) and thoughtlessly defeated device (5), thoughtlessly defeated device (5) and absorption tank (6).

2. The concentrated nitric acid dilution system of claim 1, further comprising: the number of distillation columns (2) is 40-60.

3. The concentrated nitric acid dilution system of claim 1, further comprising: the lower end of the distillation column (2) is provided with a discharge pipeline (2 b).

4. The concentrated nitric acid dilution system of claim 1, further comprising: the mixed conveying device (5) comprises a first flask (7), a second flask (8) and an acid-resistant mixed conveying pump (11), wherein a feeding port of the first flask (7) is connected with a discharging port of the condenser (3), a discharging port of the first flask (7) is connected with a feeding port of the acid-resistant mixed conveying pump (11), a first discharging port (8 a) of the second flask (8) is connected with a feeding port of the acid-resistant mixed conveying pump (11), a second discharging port (8 b) of the second flask (8) is connected with a feeding port of the finished product tank (4), and a pipeline between the feeding port of the finished product tank (4) and the second discharging port (8 b) of the second flask (8) is provided with a liquid flow regulating valve; the discharge hole of the acid-proof mixing and conveying pump (11) is connected with the feeding hole (8 c) of the second flask (8), and the air inlet of the absorption tank (6) is connected with the air outlet (8 d) of the second flask (8).

5. The concentrated nitric acid dilution system of claim 4, wherein: a liquid flow regulating valve is arranged on a pipeline between a first discharge hole (8 a) of the second flask (8) and a feeding hole of the acid-resistant mixing and conveying pump (11); and a liquid flow regulating valve is arranged on a pipeline between the discharge hole of the first flask (7) and the feeding hole of the acid-proof mixing and conveying pump (11).

6. The concentrated nitric acid dilution system of claim 4, wherein: and a switching valve is arranged on a pipeline between the air inlet of the absorption tank (6) and the air outlet (8 d) of the second flask (8).

7. The concentrated nitric acid dilution system of claim 4, wherein: the second flask (8) is also provided with a water inlet.

8. The concentrated nitric acid diluting system as claimed in any one of claims 1 to 7, wherein: a heating component (10) is arranged in the distillation column (2), and a temperature detector (14) is arranged on the distillation column (2).

9. The concentrated nitric acid dilution system of claim 8, wherein: and a circulating water jacket (2 a) is arranged on the surface of the distillation column (2), and a water inlet and a water outlet on the circulating water jacket (2 a) are respectively connected with a first circulating water upper water pipe (12) and a first circulating water return pipe (13).