Solvent degassing device

Abstract

The utility model discloses a solvent degassing device. The solvent degassing device comprises a gas-liquid separation assembly and a gas absorption assembly which are communicated through a gas pipeline, the gas-liquid separation assembly comprises a gas-liquid separation tank and a first circulating pump, and the first circulating pump is connected with the gas-liquid separation tank through a first pipeline to form a circulating spraying separation passage; the gas absorption assembly comprises a gas absorption tank and a second circulating pump, and the second circulating pump is connected with the gas absorption tank through a second pipeline to form a circulating absorption passage. Through the design of the gas-liquid separation component and the gas absorption component which are communicated through the gas pipeline, and by utilizing the characteristic that the boiling points of the gas and the solvent are greatly different, the gas with a lower boiling point escapes from the solvent in a circulating spraying process in the gas-liquid separation component; the degassing device has the advantages of being good in degassing effect, high in efficiency, easy and convenient to operate and high in practicability.

Description

Technical Field

[0001] The utility model relates to the field of medicine production equipment, in particular to a solvent degassing device. Background Art

[0002] During the drug production process, a large amount of acidic gas or ammonia is usually produced. These gases will dissolve in the solvent to varying degrees, affecting the recovery of the solvent.

[0003] For example, thionyl chloride is a common reagent in organic chemical reactions and is widely used in the production of raw materials. The typical reaction in which thionyl chloride participates is the reaction of carboxylic acid with thionyl chloride to form acyl chloride, which then reacts with alcohol or amine to form ester or amide. In the above reaction process, the use of thionyl chloride will produce acidic gases such as sulfur dioxide and hydrogen chloride gas, which will affect the recycling of solvents, and the energy consumption of three wastes treatment is large, which is not conducive to the production of green chemistry.

[0004] Therefore, it is necessary to develop a solvent degassing device to remove the gas remaining in the solvent during the chemical reaction process to facilitate the recovery and use of the solvent. Utility Model Content

[0005] The utility model provides a solvent degassing device, which can solve the problems of great difficulty and high cost in solvent recovery caused by residual gas.

[0006] In order to solve the above technical problems, the utility model provides a solvent degassing device, comprising a gas-liquid separation component and a gas absorption component connected through a gas pipeline;

[0007] The gas-liquid separation component includes a gas-liquid separation tank and a first circulation pump; the top of the gas-liquid separation tank is provided with a first feed inlet and a gas outlet, and the bottom of the gas-liquid separation tank is provided with a first discharge port; the first circulation pump is connected to the first feed inlet and the first discharge port through a first pipeline to form a circulation spray separation passage;

[0008] The gas absorption component includes a gas absorption tank and a second circulation pump. The gas absorption tank contains gas absorption liquid. The top of the gas absorption tank is provided with a second feed port, and the bottom of the gas absorption tank is provided with a second discharge port. The second feed port is connected to the gas outlet of the gas-liquid separation tank through the gas pipeline. The second circulation pump is connected to the second feed port and the second discharge port through a second pipeline to form a circulation absorption passage.

[0009] In a preferred embodiment of the present invention, the gas-liquid separation tank is further provided with a sprayer, and the first pipeline passes through the first feed port and extends into the gas-liquid separation tank and is connected to the sprayer.

[0010] In a preferred embodiment of the present invention, the sprayer includes a spray ball and a shower head.

[0011] In a preferred embodiment of the present invention, a one-way valve is installed on the gas pipeline.

[0012] In a preferred embodiment of the present invention, a Venturi injector is installed on the second feed port, and the gas pipeline and the second pipeline are respectively connected to the gas inlet and liquid inlet of the Venturi injector.

[0013] In a preferred embodiment of the utility model, the top of the Venturi injector is a feed port, the bottom end is a liquid discharge port, one side of the top is provided with an air inlet, and the interior is provided with a gas-liquid mixing chamber; the feed port, liquid discharge port and air inlet are all connected to the gas-liquid mixing chamber.

[0014] In a preferred embodiment of the utility model, the outer wall of the gas absorption tank is covered with a thermal insulation jacket, and the thermal insulation jacket is provided with a refrigerant inlet and a refrigerant outlet.

[0015] In a preferred embodiment of the present utility model, the gas-liquid separation tank is provided with a first pH meter, the gas absorption tank is provided with a second pH meter, and the first pH meter and the second pH meter are connected to the controller signal.

[0016] In a preferred embodiment of the present utility model, the gas-liquid separation tank is further provided with a first temperature sensor, and the gas absorption tank is further provided with a second temperature sensor, and the first temperature sensor and the second temperature sensor are connected to the controller signal.

[0017] In a preferred embodiment of the present utility model, the gas-liquid separation tank is further provided with a first pressure sensor, and the gas absorption tank is further provided with a second pressure sensor, and the first pressure sensor and the second pressure sensor are connected to the controller signal.

[0018] The beneficial effects of the utility model are as follows: the utility model is a solvent degassing device, which, through the design of a gas-liquid separation component and a gas absorption component connected by a gas pipeline, utilizes the large difference in boiling points between the gas and the solvent, so that the gas with a lower boiling point escapes from the solvent during the circulation spraying process in the gas-liquid separation component, and then enters the gas absorption component through the gas pipeline to be absorbed by the gas absorption liquid. The utility model has the characteristics of good degassing effect, high efficiency, simple operation, and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a preferred embodiment of a solvent degassing device of the utility model;

[0020] Figure 2 is a schematic diagram of the internal structure of the Venturi ejector shown;

[0021] The markings of the components in the accompanying drawings are as follows:

[0022] 100. gas-liquid separation component, 110. gas-liquid separation tank, 120. first circulation pump, 130. first pipeline, 111. first feed inlet, 112. gas outlet, 113. first discharge outlet, 114. sprayer, 115. first temperature sensor, 116. first pressure sensor;

[0023] 200. Gas absorption assembly, 210. Gas absorption tank, 220. Second circulation pump, 230. Second pipeline, 240. Venturi ejector, 250. Insulation jacket, 211. Second feed inlet, 212. Second discharge outlet, 213. Second temperature sensor, 214. Second pressure sensor, 215. Gas absorption liquid delivery pipe, 241. Liquid inlet, 242. Liquid discharge outlet, 243. Gas inlet, 244. Gas-liquid mixing chamber, 251. Refrigerant inlet, 252. Refrigerant outlet,

[0024] 300. Gas pipeline, 310. Check valve. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0026] like Figure 1 As shown, the embodiment of the utility model discloses a solvent degassing device including a gas-liquid separation component 100 and a gas absorption component 200 , wherein the gas-liquid separation component 100 and the gas absorption component 200 are connected via a gas pipeline 300 .

[0027] Specifically, the gas-liquid separation assembly 100 includes a gas-liquid separation tank 110 and a first circulation pump 120 .

[0028] The top of the gas-liquid separation tank 110 is provided with a first feed inlet 111 and a gas outlet 112, and the bottom thereof is provided with a first discharge port 113. The first circulation pump 120 is connected to the first feed inlet 111 and the first discharge port 113 through a first pipeline 130 to form a circulation spray separation passage. The solvent to be degassed circulates in the gas-liquid separation tank 110 and the first pipeline 130 through the first circulation pump 120, and when it flows back from the first feed inlet 111 to the gas-liquid separation tank 110, the dissolved gas will escape from the solvent under the action of spraying, thereby achieving gas-liquid separation.

[0029] In order to further improve the gas-liquid separation effect, a sprayer 114 is further installed inside the gas-liquid separation tank 110. The first pipe 130 extends into the gas-liquid separation tank 110 through the first feed port 111 and is connected to the sprayer 114. The sprayer 114 can be a spray ball or a shower. In this embodiment, it is a spray ball.

[0030] The gas escaping from the gas-liquid separation tank 110 enters the gas absorption assembly 200 through the gas pipeline 300 .

[0031] Specifically, the gas absorption assembly 200 includes a gas absorption tank 210 and a second circulation pump 220 .

[0032] The gas absorption tank 210 contains a gas absorption liquid. For acidic gases, the gas absorption liquid is an alkaline solution, such as sodium hydroxide solution, sodium bicarbonate solution, etc. For ammonia, the gas absorption liquid is an acidic solution, such as dilute hydrochloric acid solution, dilute sulfuric acid solution, etc.

[0033] The gas absorption tank 210 has a second feed port 211 at the top and a second discharge port 212 at the bottom. The second feed port 211 is connected to the gas outlet 112 of the gas-liquid separation tank 110 via the gas pipeline 300. The second circulation pump 220 is connected to the second feed port 211 and the second discharge port 212 via the second pipeline 230 to form a circulation absorption passage. That is, the gas absorption liquid in the gas absorption tank 210 circulates in the gas absorption tank 210 and the second pipeline 230 under the action of the second circulation pump 220, and when it flows back from the second feed port 211 to the gas absorption tank 210, the contact time and contact area with the gas will be increased, thereby improving the gas absorption effect.

[0034] The gas pipeline 300 is installed with a one-way valve 310 so that the gas can only flow from the gas-liquid separation tank 110 to the gas absorption tank 210 .

[0035] In order to further improve the gas absorption effect, a venturi ejector 240 is further installed on the second feed port 211 of the gas absorption tank 210. The top of the venturi ejector 240 is a liquid inlet 241, the bottom of the venturi ejector 240 is a liquid discharge port 242, the top side of the venturi ejector 240 is provided with an air inlet 243, and the inside of the venturi ejector 240 is provided with a gas-liquid mixing chamber 244; the liquid inlet 241, the liquid discharge port 242 and the air inlet 243 are all connected to the gas-liquid mixing chamber 244.

[0036] The liquid discharge port 242 of the venturi ejector 240 is connected to the second feed port 211 at the top of the gas absorption tank 210, the gas pipeline 300 is connected to the gas inlet 243 of the venturi ejector 240, and the second pipeline 230 is connected to the liquid inlet 241 of the venturi ejector 240. The gas from the gas-liquid separation tank 110 and the gas absorption liquid meet and mix in the gas-liquid mixing chamber 244 of the venturi ejector 240. Through the use of the venturi ejector, not only the contact area between the gas absorption liquid and the gas is further increased, so that the gas can be quickly absorbed in a short time, but also this efficient and fast absorption rate makes the gas in the venturi ejector instantly reduce, thus producing a micro-vacuum effect, further prompting the gas to accelerate outflow from the gas-liquid separation tank 110, reducing the pressure of the gas in the gas-liquid separation tank 110, which is conducive to promoting gas-liquid separation, and finally realizing the rapid escape and reabsorption of the gas, and improving the solvent degassing effect and rate.

[0037] Specifically, the outer wall of the gas absorption tank 210 is also covered with an insulation jacket 250, and the insulation jacket 250 is provided with a refrigerant inlet 251 and a refrigerant outlet 252. The refrigerant continuously enters and exits the insulation jacket 250 through the refrigerant inlet 251 and the refrigerant outlet 252 to control the temperature in the entire gas absorption tank 210, specifically controlled to be below 20°C, preferably 10-15°C, to prevent the acid-base neutralization reaction between the gas and the gas absorption liquid from releasing heat, causing the temperature in the gas absorption tank 210 to rise, thereby affecting the absorption effect.

[0038] In addition, the gas-liquid separation tank 110 is also connected to a first temperature sensor 115, a first pressure sensor 116 and a first pH meter (not shown in the figure), and the gas absorption tank 210 is connected to a second temperature sensor 213, a second pressure sensor 214 and a second pH meter (not shown in the figure). The first temperature sensor 215, the first pressure sensor 116, the first pH meter, the second temperature sensor 213, the second pressure sensor 214 and the second pH meter are respectively connected to the controller signal.

[0039] The first temperature sensor 115, the first pressure sensor 116 and the pH meter are respectively used to detect in real time the temperature, pressure and pH value in the gas-liquid separation tank 110. When the pH value measured by the first pH meter received by the controller reaches the predetermined requirement, it means that the gas in the solvent in the gas-liquid separation tank 110 has been completely removed, and the cycle degassing is completed.

[0040] The second temperature sensor 213, the second pressure sensor 214 and the second pH meter are respectively used to detect in real time the temperature, pressure and pH value in the gas absorption tank 210. When the pH value measured by the second pH meter received by the controller is close to neutral, it means that the gas absorption liquid in the gas absorption tank 210 can no longer effectively absorb the gas, and fresh gas absorption liquid needs to be replaced to ensure the effect and efficiency of gas absorption.

[0041] The gas absorption tank 210 is also connected to a gas absorption liquid delivery pipe 215 .

[0042] The working principle of the solvent degassing device in the embodiment of the utility model is:

[0043] Most of the acidic gases produced in organic chemical reactions, such as sulfur dioxide gas, hydrogen chloride gas, carbon dioxide gas and hydrogen sulfide gas, have boiling points of -10°C, -85°C, -56.6°C and -60.4°C respectively; alkaline gases, such as ammonia, have a boiling point of -33.5°C.

[0044] Solvents commonly used in organic chemical reactions, such as dichloromethane, ethanol, tetrahydrofuran, etc., have boiling points of 39.8°C, 78.3°C, and 65°C, respectively, which are significantly higher than the boiling points of the above-mentioned acidic gases or ammonia.

[0045] The embodiment of the utility model utilizes the difference in boiling points between gas and solvent to design and develop a solvent degassing device. Through the design of a gas-liquid separation component and a gas absorption component connected by a gas pipeline, the gas separation component is first used to evaporate and separate the gas with a lower boiling point from the solvent at room temperature, and then enters the gas absorption component through the gas pipeline to be absorbed by the gas absorption liquid, thereby achieving solvent degassing.

[0046] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A solvent degassing device, characterized in that: It includes a gas-liquid separation component and a gas absorption component connected by a gas pipeline; The gas-liquid separation component includes a gas-liquid separation tank and a first circulation pump; the top of the gas-liquid separation tank is provided with a first feed inlet and a gas outlet, and the bottom of the gas-liquid separation tank is provided with a first discharge port; the first circulation pump is connected to the first feed inlet and the first discharge port through a first pipeline to form a circulation spray separation passage; The gas absorption component includes a gas absorption tank and a second circulation pump. The gas absorption tank contains gas absorption liquid. The top of the gas absorption tank is provided with a second feed port, and the bottom of the gas absorption tank is provided with a second discharge port. The second feed port is connected to the gas outlet of the gas-liquid separation tank through the gas pipeline. The second circulation pump is connected to the second feed port and the second discharge port through a second pipeline to form a circulation absorption passage.

2. A solvent degassing device according to claim 1, characterized in that: The gas-liquid separation tank is also provided with a sprayer, and the first pipeline passes through the first feed port and extends into the gas-liquid separation tank and is connected to the sprayer.

3. A solvent degassing device according to claim 2, characterized in that: The sprayer comprises a spray ball and a shower head.

4. A solvent degassing device according to claim 1, characterized in that: A one-way valve is installed on the gas pipeline.

5. A solvent degassing device according to claim 1, characterized in that: A venturi injector is installed on the second feed port, and the gas pipeline and the second pipeline are respectively connected to the gas inlet and liquid inlet of the venturi injector.

6. A solvent degassing device according to claim 5, characterized in that: The top of the Venturi ejector is a feed port, the bottom of the Venturi ejector is a liquid discharge port, one side of the top of the Venturi ejector is provided with an air inlet, and the interior of the Venturi ejector is provided with a gas-liquid mixing chamber; the feed port, liquid discharge port and air inlet are all connected to the gas-liquid mixing chamber.

7. A solvent degassing device according to claim 1, characterized in that: The outer wall of the gas absorption tank is covered with a heat-insulating jacket, and the heat-insulating jacket is provided with a refrigerant inlet and a refrigerant outlet.

8. A solvent degassing device according to claim 1, characterized in that: The gas-liquid separation tank is provided with a first pH meter, and the gas absorption tank is provided with a second pH meter. The first pH meter and the second pH meter are connected to the controller signal.

9. A solvent degassing device according to claim 8, characterized in that: The gas-liquid separation tank is also provided with a first temperature sensor, and the gas absorption tank is also provided with a second temperature sensor. The first temperature sensor and the second temperature sensor are connected to the controller signal.

10. A solvent degassing device according to claim 9, characterized in that: The gas-liquid separation tank is also provided with a first pressure sensor, and the gas absorption tank is also provided with a second pressure sensor. The first pressure sensor and the second pressure sensor are connected to the controller signal.

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