Device for recovering di-n-propylamine from hydrochloride wastewater

Abstract

The utility model discloses a device for recovering di-n-propylamine from hydrochloride wastewater, which comprises a feeding component, a first reaction kettle, a distillation cooling device, a second reaction kettle and a separation receiving component which are sequentially connected through pipelines, and a PH (potential of hydrogen) detection device is arranged in the first reaction kettle. The utility model provides the device for recovering the di-n-propylamine from the hydrochloride wastewater, the steps of feeding, neutralizing, distilling and separating liquid are carried out in sequence to recover the di-n-propylamine from the hydrochloride wastewater, and the pH detector is arranged in the first reaction kettle, so that the use amount of liquid caustic soda can be intuitively controlled, and errors caused by manual sampling and measurement are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and particularly relates to a device for recovering di-n-propylamine from hydrochloride waste water. Background Art

[0002] Dipropylamine is a colorless, transparent liquid with an ammoniacal odor that can form hydrates. It is readily soluble in water, ethanol, and ether. It is a flammable, highly toxic, and corrosive liquid found naturally in tobacco leaves and artificially discharged industrial waste. Dipropylamine is commonly used in the production of pharmaceuticals, pesticides, dyes, mineral flotation agents, emulsifiers, and as an intermediate for fine chemicals. During chemical reactions, dipropylamine readily reacts with hydrogen chloride produced or present in the reaction solution to form dipropylamine hydrochloride as a byproduct. With the increasing environmental pressures and the tightening of regulations on toxic and hazardous raw materials, the price of chemical raw materials, especially dipropylamine, continues to rise. To protect the environment, conserve resources, and reduce production costs, recovering dipropylamine from dipropylamine hydrochloride is a feasible and effective method, and an inevitable trend.

[0003] In the related art, distillation is generally used to recover dipropylamine. However, it is difficult to control the amount of alkali solution during the distillation process, which can easily lead to errors. Utility Model Content

[0004] The utility model aims to provide a device for recovering di-n-propylamine from hydrochloride wastewater, so as to solve the problem in the prior art that the amount of alkali solution is difficult to control and errors are easily generated during the distillation process.

[0005] To this end, the utility model provides a device for recovering dipropylamine from hydrochloride wastewater, comprising: a feeding component, a first reactor, a distillation cooling device, a second reactor and a separation and receiving component connected in sequence through pipelines, wherein the first reactor is provided with a pH detection device.

[0006] Preferably, the feeding assembly includes a first header tank and a second header tank, wherein the first header tank and the second header tank are connected to the first reactor via a pipeline. The first header tank is used to store hydrochloride wastewater, and the second header tank is used to store liquid caustic soda.

[0007] Preferably, a first shut-off valve and a first flow regulating valve are provided on the pipeline connecting the first high-level tank and the first reactor; a second shut-off valve and a second flow regulating valve are provided on the pipeline connecting the second high-level tank and the first reactor.

[0008] Preferably, the first reactor is provided with a first stirring system and a first heating and cooling system. The first stirring system uses a motor to drive a stirring rod to rotate within the first reactor, stirring the material entering the first stirring reactor. The first heating and cooling system heats the first reactor body via heating rods on the reactor wall and cools the first reactor via a water cooling system.

[0009] Preferably, a temperature detection device is provided in the first reactor to detect the temperature in the first reactor.

[0010] Preferably, the second reactor is provided with a second stirring system and a second heating and cooling system. The second stirring system uses a motor to drive a stirring rod to rotate within the second reactor, stirring the material entering the second stirred tank. The second heating and cooling system heats the second reactor body via heating rods on the reactor wall and cools the second reactor via a water cooling system.

[0011] Preferably, the second reactor is provided with a solid feeding device for adding solid caustic soda flakes into the second reactor.

[0012] Preferably, the separation and receiving assembly includes a separation device, a first receiving device and a second receiving device. The separation device is connected to the second reactor through a pipeline, and the separation device is connected to the first receiving device and the second receiving device through pipelines.

[0013] Preferably, a discharge valve is provided on the pipeline between the second reactor and the separation and receiving component.

[0014] Preferably, a three-way valve is provided on the pipeline connecting the separation device and the first receiving device and the second receiving device.

[0015] Beneficial effects:

[0016] 1. The utility model provides a device for recovering di-n-propylamine from hydrochloride wastewater. The steps of feeding, neutralization, distillation, and liquid separation are performed in sequence to recover di-n-propylamine from hydrochloride wastewater. A pH detector is provided in the first reactor, which can intuitively control the amount of liquid caustic soda, thereby reducing the error of manual sampling and measurement.

[0017] 2. The utility model is provided with a first shut-off valve and a first flow regulating valve on the pipeline connecting the first high-level tank and the first reactor; a second shut-off valve and a second flow regulating valve are provided on the pipeline connecting the second high-level tank and the first reactor. Cooperating with the heating and cooling system of the first reactor, the heat release of the system can be effectively controlled, which is safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 The utility model provides a pipeline schematic diagram of a device for recovering di-n-propylamine from hydrochloride wastewater.

[0020] In the figure, 1-first high-level tank, 2-second high-level tank, 3-first shut-off valve, 4-first flow regulating valve, 5-second shut-off valve, 6-second flow regulating valve, 7-first reactor, 8-temperature detection device, 9-PH detection device, 10-first stirring system, 11-distillation cooling device, 12-second stirring system, 13-solid feeding device, 14-second reactor, 15-discharging valve, 16-separation device, 17-three-way valve, 18-first receiving device, 19-second receiving device. DETAILED DESCRIPTION

[0021] The present invention can be more easily understood by referring to the following detailed description of the preferred embodiments of the present invention and the included Examples. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. In the event of any conflict, the definitions in this specification shall prevail.

[0022] Example 1:

[0023] Provides such Figure 1 The device shown in the figure for recovering di-n-propylamine from hydrochloride wastewater comprises: a feeding assembly, a first reactor 7, a distillation cooling device 11, a second reactor 14 and a separation and receiving assembly which are sequentially connected through pipelines.

[0024] The feeding assembly includes a first high-level tank and a second high-level tank 2. The first high-level tank 1 and the second high-level tank 2 are connected to the first reactor 7 through a pipeline. A first shut-off valve 3 and a first flow regulating valve 4 are provided on the pipeline connecting the first high-level tank 1 and the first reactor 7; a second shut-off valve 5 and a second flow regulating valve 6 are provided on the pipeline connecting the second high-level tank 2 and the first reactor 7. Among them, the first high-level tank 1 is used to store hydrochloride wastewater, and the second high-level tank 2 is used to store liquid alkali. The first shut-off valve 3 controls the start and stop of the first high-level tank 1, and controls the flow of materials from the first high-level tank 1 into the first reactor 7 through the first flow regulating valve 4; the second shut-off valve 5 controls the start and stop of the second high-level tank 2, and controls the flow of materials from the second high-level tank 2 into the second reactor 14 through the second flow regulating valve 6.

[0025] The first reactor 7 is equipped with a first stirring system 10 and a first heating and cooling system. A pH detector 9 and a temperature detector 8 are also provided. The first stirring system 10 uses a motor to drive a stirring rod to rotate within the first reactor 7, stirring the material entering the first stirring tank. The first heating and cooling system heats the first reactor 7 via heating rods on the reactor wall and cools the first reactor 7 via a water cooling system. The pH detector 9 detects the pH value within the first reactor 7, and the temperature detector 8 detects the temperature within the first reactor 7.

[0026] The second reactor 14 is equipped with a second stirring system 12 and a second heating and cooling system. A solid feeding device 13 is also provided in the second reactor 14. The second stirring system 12 uses a motor to drive a stirring rod to rotate within the second reactor 14, stirring the material entering the second stirring tank. The second heating and cooling system heats the reactor body 14 using heating rods in the reactor wall and cools the reactor body 14 using a water cooling system. The solid feeding device 13 is used to add solid caustic soda flakes to the second reactor 14.

[0027] The separation and receiving assembly includes a separation device 16, a first receiving device 18, and a second receiving device 19. The separation device 16 is connected to the second reactor 14 via a pipeline, and the separation device 16 is connected to the first receiving device 18 and the second receiving device 19 via pipelines. A discharge valve 15 is installed on the pipeline between the second reactor 14 and the separation and receiving assembly. A three-way valve 17 is installed on the pipeline connecting the separation device 16 to the first receiving device 18 and the second receiving device 19.

[0028] Working Principle: Adjust the stirring speed of the first reactor 7, open the first shut-off valve 3 of the first header tank 1, control the feed rate via the first flow control valve 4, activate the cooling function of the heating and cooling system of the first reactor 7, and control the temperature at room temperature. Then, open the second shut-off valve 5 of the second header tank 2, and control the feed rate via the second flow control valve 6. Monitor the pH value in the first reactor 7 in real time. Once the pH value reaches the required value, close the second shut-off valve 5 of the second header tank 2. Activate the heating function of the heating and cooling system of the first reactor 7 to initiate distillation, and control the distillation progress via the temperature detection device 8. After distillation, the product is cooled in the cooling device and then enters the second reactor 14. Caustic soda flakes are added via the solid feeder 13. After stirring, open the feed valve 15 to enter the separation and receiving assembly. After standing in the separation assembly 16, adjust the three-way valve 17 to recover the raw material and alkaline wastewater. The raw material enters the first receiving assembly 18, and the alkaline wastewater enters the second receiving assembly 19.

Claims

1. A device for recovering di-n-propylamine from hydrochloride wastewater, characterized in that: include: The feeding assembly, the first reactor, the distillation cooling device, the second reactor and the separation and receiving assembly are connected in sequence through pipelines, and the first reactor is provided with a pH detection device.

2. A device for recovering di-n-propylamine from hydrochloride wastewater according to claim 1, characterized in that, The feeding assembly includes a first elevated tank and a second elevated tank, and the first elevated tank and the second elevated tank are connected to the first reactor via a pipeline.

3. A device for recovering di-n-propylamine from hydrochloride wastewater according to claim 2, characterized in that, A first shut-off valve and a first flow regulating valve are provided on the pipeline connecting the first high-level tank and the first reactor; a second shut-off valve and a second flow regulating valve are provided on the pipeline connecting the second high-level tank and the first reactor.

4. A device for recovering di-n-propylamine from hydrochloride wastewater according to claim 1, characterized in that The first reactor is provided with a first stirring system and a first heating and cooling system.

5. A device for recovering di-n-propylamine from hydrochloride wastewater according to claim 4, characterized in that, The first reactor is provided with a temperature detection device.

6. A device for recovering di-n-propylamine from hydrochloride wastewater according to claim 1, characterized in that, The second reactor is provided with a second stirring system and a second heating and cooling system.

7. A device for recovering di-n-propylamine from hydrochloride wastewater according to claim 6, characterized in that: The second reactor is provided with a solid feeding device.

8. A device for recovering di-n-propylamine from hydrochloride wastewater according to claim 1, characterized in that: The separation and receiving assembly includes a separation device, a first receiving device and a second receiving device. The separation device is connected to the second reactor through a pipeline, and the separation device is connected to the first receiving device and the second receiving device through pipelines.

9. A device for recovering di-n-propylamine from hydrochloride wastewater according to claim 8, characterized in that: A discharge valve is provided on the pipeline between the second reactor and the separation and receiving component.

10. The device for recovering di-n-propylamine from hydrochloride wastewater according to claim 8, characterized in that: A three-way valve is provided on the pipeline connecting the separation device and the first receiving device and the second receiving device.

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