CN216909222U

CN216909222U - Paranitroaniline recovery device

Info

Publication number: CN216909222U
Application number: CN202123279669.3U
Authority: CN
Inventors: 吕成文
Original assignee: Liaoning Senyuan Chemical Ltd By Share Ltd
Current assignee: Liaoning Senyuan Chemical Ltd By Share Ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-07-08
Anticipated expiration: 2031-12-24

Abstract

The utility model discloses a p-nitroaniline recovery device which comprises a falling film absorption tower and a condenser pipe, wherein the top surface of the falling film absorption tower is provided with an air inlet. Has the beneficial effects that: the utility model adopts the condenser pipe and the industrial water chiller, in the process of recovering the nitroaniline, water cooled by the industrial water chiller is injected into the condenser pipe, so that the surface temperature of the condenser pipe is low, ammonia gas and waste gas enter the falling film absorption tower through the air inlet, the ammonia gas and the waste gas firstly pass through the condenser pipe with lower temperature, free ammonia in the waste gas and the ammonia gas is condensed and combined with acid gas ions in the waste gas to form ammonium bicarbonate, the ammonium bicarbonate is crystallized and adsorbed on the outer surface of the condenser pipe, and the ammonium bicarbonate is removed in advance, so that the phenomenon that the ammonium bicarbonate formed by the free ammonia in the waste gas and the acid gas ions in the waste gas is condensed and blocked in the falling film absorption tower is avoided, the ammonia recovery of the falling film absorption tower is avoided being influenced, and the smoothness of the ammonia recovery is improved.

Description

Paranitroaniline recovery device

Technical Field

The utility model relates to the technical field of p-nitroaniline production, in particular to a p-nitroaniline ammonia recovery device.

Background

Para nitroaniline, yellow needle crystal, high toxicity, easy sublimation, slight solubility in cold water, solubility in boiling water, ethanol, ether, benzene and acid solution, wide application in synthetic chemicals in dye industry, intermediate of various printing and dyeing and pharmaceutical chemicals, and application in analytical reagent.

Paranitroaniline can produce a large amount of ammonia and other acid gas in process of production, form mixed waste gas, generally adopt falling film absorption tower to carry out ammonia recovery, however, at the in-process of retrieving, the temperature reduces, free ammonia ion and acid gas's ion can condense and form the ammonium bicarbonate crystallization, attach to inside the falling film absorption tower, produce and block up, thereby influence continuity and the smooth and easy nature of retrieving, reduce recovery efficiency, can further make the improvement, in addition, ammonium bicarbonate can directly be applied to the production of ammonia fertilizer, also can further recycle.

An effective solution to the problems in the related art has not been proposed yet.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Aiming at the defects of the prior art, the utility model provides a paranitroaniline ammonia recovery device which has the advantages of smoother ammonia recovery and reduction of ammonia waste, and further solves the problems in the background art.

(II) technical scheme

In order to realize the advantages of smoother ammonia recovery and reduction of ammonia waste, the utility model adopts the following specific technical scheme:

paranitroaniline ammonia recovery unit, including falling liquid film absorption tower and condenser pipe, the air inlet has been seted up to falling liquid film absorption tower top surface, and the air inlet below is equipped with the condenser pipe in the inside mount of falling liquid film absorption tower to the condenser pipe both ends are through connection respectively has inlet tube and outlet pipe, falling liquid film absorption tower installs industry cold water machine in one side, and industry cold water machine intake end and play water end respectively with inlet tube and play water end through connection.

Further, falling liquid film absorption tower side surface through connection has the spray tube, and the spray tube extends to the condenser pipe top to spray tube surface through connection has the shower nozzle, the condenser pipe below is located the inside fixedly connected with baffle of falling liquid film absorption tower, and baffle surface through connection has the gas-supply pipe to baffle top fixed mounting has level switch, the baffle top surface is located falling liquid film absorption tower opposite side surface through connection has the raceway, and the raceway other end through connection has the bin to raceway surface mounting has the solenoid valve.

Furthermore, the top surface of the gas pipe is fixedly connected with a canopy through a supporting rod, and the area of the bottom surface of the canopy is larger than that of the top surface of the gas pipe.

Furthermore, the gas transmission pipe is provided with a plurality of, and gas transmission pipe top surface height is greater than liquid level switch mounting height.

Furthermore, the spray heads are provided with a plurality of spray heads, and the spray heads adopt nonmetal spray heads.

Furthermore, the condenser pipe adopts a chromium-plated stainless steel spiral pipe, and the distribution height of the condenser pipe is not less than one meter.

(III) advantageous effects

Compared with the prior art, the utility model provides a p-nitroaniline recovery device, which has the following beneficial effects:

(1) the utility model adopts the condenser pipe and the industrial water chiller, in the process of recovering the nitroaniline, water cooled by the industrial water chiller is injected into the condenser pipe, so that the surface temperature of the condenser pipe is low, ammonia gas and waste gas enter the falling film absorption tower through the air inlet, firstly, the ammonia gas and the waste gas pass through the condenser pipe with lower temperature, free ammonia in the waste gas and the ammonia gas is condensed and combined with acid gas ions in the waste gas to form ammonium bicarbonate, the ammonium bicarbonate is crystallized and adsorbed on the outer surface of the condenser pipe and is removed in advance, thereby the phenomenon that the ammonium bicarbonate formed by the free ammonia in the waste gas and the acid gas ions in the waste gas is condensed and blocked in the falling film absorption tower is avoided, the influence on the ammonia recovery of the falling film absorption tower is avoided, and the smoothness of the ammonia recovery is improved.

(2) The utility model adopts the spray pipe and the partition board, after ammonia gas recovery is finished, low-temperature water can be injected into the spray pipe, high-temperature water is sprayed out through the spray head and sprayed on the surface of the condenser pipe to dissolve ammonium bicarbonate to form ammonium bicarbonate solution, the ammonium bicarbonate solution falls above the partition board, the liquid level meter detects the liquid level, when the liquid level reaches a set value, the electromagnetic valve is opened, and the ammonium bicarbonate solution enters the storage box through the water pipe, so that the ammonium bicarbonate is collected, the ammonium bicarbonate solution can be directly applied to ammonia fertilizer production, ammonia waste is avoided, the environment is more protected, meanwhile, the condenser pipe is also cleaned, and the next work is facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a p-nitroaniline ammonia recovery device provided by the utility model;

FIG. 2 is a front view of a p-nitroaniline ammonia recovery unit according to the present invention;

FIG. 3 is an enlarged view of the node A of the paranitroaniline recovery device provided by the utility model;

FIG. 4 is a schematic view of the structure of a gas pipe according to the present invention.

In the figure:

1. a falling film absorption tower; 2. an air inlet; 3. a condenser tube; 4. a water inlet pipe; 5. a water outlet pipe; 6. an industrial water chiller; 7. a storage tank; 8. a water delivery pipe; 9. a nozzle; 10. an electromagnetic valve; 11. a partition plate; 12. a gas delivery pipe; 13. a canopy; 14. a liquid level switch; 15. a strut; 16. and (4) a spray head.

Detailed Description

For further explanation of the various embodiments, the drawings which form a part of the disclosure and which are incorporated in and constitute a part of this specification, illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and to enable others of ordinary skill in the art to understand the various embodiments and advantages of the utility model, and, by reference to these figures, reference is made to the accompanying drawings, which are not to scale and wherein like reference numerals generally refer to like elements.

According to the embodiment of the utility model, a p-nitroaniline ammonia recovery device is provided.

Referring to the drawings and the detailed description, as shown in fig. 1-4, a paranitroaniline recovery device according to an embodiment of the utility model includes a falling film absorption tower 1 and a condenser pipe 3, wherein a gas inlet 2 is formed in the top surface of the falling film absorption tower 1, the device is a common device, the condenser pipe 3 is fixed below the gas inlet 2 and located inside the falling film absorption tower 1, two ends of the condenser pipe 3 are respectively connected with a water inlet pipe 4 and a water outlet pipe 5 in a penetrating manner, an industrial water cooler 6 is installed on one side of the falling film absorption tower 1, the device is a common device, a water inlet end and a water outlet end of the industrial water cooler 6 are respectively connected with the water inlet pipe 4 and the water outlet end in a penetrating manner, the device is a common cooling water conveying structure, water cooled by the industrial water cooler 6 is injected into the condenser pipe 3 during paranitroaniline recovery, so that the surface temperature of the condenser pipe 3 is low, and ammonia gas and waste gas enter the falling film absorption tower 1 through the gas inlet 2, at first through condenser pipe 3 that the temperature is lower, free ammonia in waste gas and the ammonia combines with the acid gas ion condensation in the waste gas, form ammonium bicarbonate, the crystallization is adsorbed at condenser pipe 3 surface, get rid of ammonium bicarbonate in advance, thereby avoid the ammonium bicarbonate that free ammonia in waste gas and the ammonia and the acid gas ion formation in the waste gas form to condense and arouse the phenomenon of jam inside falling liquid film absorption tower 1, avoid influencing falling liquid film absorption tower 1 and carry out ammonia recovery, thereby improved ammonia recovery's smooth and easy nature.

In one embodiment, a spray pipe 9 is connected to one side surface of the falling film absorption tower 1 in a penetrating manner, the spray pipe 9 extends to the upper part of the condensation pipe 3, the spray pipe 9 is communicated with cold water, a spray nozzle 16 is connected to the surface of the spray pipe 9 in a penetrating manner, a partition 11 is fixedly connected to the lower part of the condensation pipe 3 in the falling film absorption tower 1 in a penetrating manner, a gas pipe 12 is connected to the surface of the partition 11 in a penetrating manner, a liquid level switch 14 is fixedly installed above the partition 11, a water pipe 8 is connected to the top surface of the partition 11, which is positioned on the other side surface of the falling film absorption tower 1 in a penetrating manner, the other end of the water pipe 8 is connected in a penetrating manner, a storage tank 7 is connected to the other end of the water pipe 8 in a penetrating manner, a solenoid valve 10 is installed on the surface of the water pipe 8, the output end of the liquid level switch 14 is electrically connected with the input end of the solenoid valve 10, and is a liquid level control structure, when the ammonia gas is recovered, low-temperature water can be injected into the spray pipe 9 through the spray nozzle 16 and sprayed on the surface of the condensation pipe 3, dissolve ammonium bicarbonate, form ammonium bicarbonate solution, fall 11 tops of baffle, the level gauge detects the liquid level, when the liquid level reaches the setting value, open solenoid valve 10, ammonium bicarbonate solution enters into bin 7 through raceway 8 to collect ammonium bicarbonate, but direct application in the production of ammonia fertilizer, it is extravagant to have avoided the ammonia, environmental protection more, has also cleared up condenser pipe 3 simultaneously, the next work of being convenient for.

In one embodiment, the top surface of the air pipe 12 is fixedly connected with the canopy 13 through the support rod 15, and the area of the bottom surface of the canopy 13 is larger than that of the top surface of the air pipe 12, so that spray water is prevented from entering the air pipe 12.

In one embodiment, the air delivery pipe 12 is provided in plurality, and the height of the top surface of the air delivery pipe 12 is greater than the installation height of the liquid level switch 14, so as to further prevent water from entering the air delivery pipe 12.

In one embodiment, the spray head 16 is provided in plurality, and the spray head 16 adopts a non-metal spray head, so that the corrosion influence is reduced.

In one embodiment, the condenser pipe 3 adopts a chromium-plated stainless steel spiral pipe, the corrosion influence is reduced, the distribution height of the condenser pipe 3 is not less than one meter, the condensation path is prolonged, and the condensation efficiency is improved.

The working principle is as follows:

in the process of recovering paranitroaniline, water cooled by an industrial water cooler 6 is injected into a condenser pipe 3, so that the surface temperature of the condenser pipe 3 is low, ammonia gas and waste gas enter a falling film absorption tower 1 through an air inlet 2, firstly, the free ammonia in the waste gas and the ammonia gas is condensed and combined with acid gas ions in the waste gas through the condenser pipe 3 with lower temperature to form ammonium bicarbonate, the ammonium bicarbonate is adsorbed on the outer surface of the condenser pipe 3 in a crystallization manner and is removed in advance, so that the phenomenon that the ammonium bicarbonate formed by the free ammonia in the waste gas and the acid gas ions in the waste gas is condensed and blocked in the falling film absorption tower 1 is avoided, the ammonia recovery of the falling film absorption tower 1 is avoided being influenced, the smoothness of the ammonia recovery is improved, after the ammonia recovery is finished, low-temperature water can be injected into a spray pipe 9, and the high-temperature water is sprayed out through a spray head 16, spray 3 surfaces at condenser pipe, dissolve ammonium bicarbonate, form ammonium bicarbonate solution, fall baffle 11 top, the level gauge detects the liquid level, when the liquid level reaches the setting value, open solenoid valve 10, ammonium bicarbonate solution enters into bin 7 through raceway 8, thereby collect ammonium bicarbonate, but direct application in ammonia fertilizer production, it is extravagant to have avoided ammonia, environmental protection more, condenser pipe 3 has also been cleared up simultaneously, the next work of being convenient for.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. Paranitroaniline ammonia recovery unit, its characterized in that, including falling liquid film absorption tower (1) and condenser pipe (3), air inlet (2) have been seted up to falling liquid film absorption tower (1) top surface, and air inlet (2) below is equipped with condenser pipe (3) in falling liquid film absorption tower (1) inside mount to condenser pipe (3) both ends are through connection respectively have inlet tube (4) and outlet pipe (5), industry cold water machine (6) are installed to falling liquid film absorption tower (1) one side, and industry cold water machine (6) intake end and outlet end respectively with inlet tube (4) and outlet end through connection.

2. The paranitroaniline recovery device according to claim 1, wherein a spray pipe (9) is connected to one side surface of the falling film absorption tower (1) in a penetrating manner, the spray pipe (9) extends to the position above the condensation pipe (3), a spray head (16) is connected to the surface of the spray pipe (9), a partition plate (11) is fixedly connected to the lower part of the condensation pipe (3) and positioned inside the falling film absorption tower (1), a gas pipe (12) is connected to the surface of the partition plate (11) in a penetrating manner, a liquid level switch (14) is fixedly mounted above the partition plate (11), a water pipe (8) is connected to the top surface of the partition plate (11) and positioned on the other side surface of the falling film absorption tower (1) in a penetrating manner, a storage box (7) is connected to the other end of the water pipe (8) in a penetrating manner, and an electromagnetic valve (10) is mounted on the surface of the water pipe (8).

3. The paranitroaniline recovery device according to claim 2, wherein the top surface of the gas transmission pipe (12) is fixedly connected with a canopy (13) through a support rod (15), and the area of the bottom surface of the canopy (13) is larger than that of the top surface of the gas transmission pipe (12).

4. The paranitroaniline recovery device according to claim 2, wherein a plurality of air delivery pipes (12) are arranged, and the height of the top surface of each air delivery pipe (12) is greater than the installation height of the liquid level switch (14).

5. The paranitroaniline ammonia recovery device according to claim 2, wherein a plurality of spray heads (16) are provided, and the spray heads (16) are non-metal spray heads.

6. The paranitroaniline ammonia recovery device according to claim 1, wherein the condenser pipe (3) adopts a chromium-plated stainless steel spiral pipe, and the distribution height of the condenser pipe (3) is not less than one meter.