Continuous methyl chloride recycling and reusing device

Abstract

The utility model discloses a chloromethane continuous recycling and applying device which comprises a first absorption tower, a second absorption tower, a third absorption tower, a third absorption tower, a third absorption tower, a third absorption tower and a third absorption tower, wherein the outer surface of the first absorption tower is fixedly connected with a first gas inlet valve; the outer surface of the first absorption tower is fixedly connected with a first pump, a first tail gas valve and a first spraying valve; the outer surface of the first absorption tower is fixedly connected with a first recovered liquid feeding valve; through cooperation of the first absorption tower, the second absorption tower, the first pump, the second pump, the first feed port and the second feed port, when the absorption towers transfer a saturated chloromethane solution and supplement a new solvent, shutdown is not needed, continuous operation of the absorption device can be achieved, uncertain factors in the operation process are reduced, and meanwhile the influence on the environment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of methyl chloride, in particular to a methyl chloride continuous recovery and utilization device. Background Art

[0002] Methyl chloride, also known as methyl chloride, is an organic compound with the chemical formula CH3Cl. It is a colorless gas at room temperature and pressure, slightly soluble in water, soluble in ethanol, chloroform, benzene, carbon tetrachloride, glacial acetic acid, etc. The boiling point is -24.2℃. It is a very cheap methylation raw material in chemical synthesis. In the previous methyl chloride recovery and application device, the amount of methyl chloride is large, and the pressure relief after the reaction puts great pressure on environmental protection, and at the same time causes material waste and increases production costs. Due to the large number of methylation reactors, the recovery and reuse of methyl chloride do not affect each other. Continuous recovery and application of methyl chloride has become a problem to be solved. Now a method of using double towers or multiple towers in series to improve the absorption rate of methyl chloride is proposed to ensure that methyl chloride can continue to be absorbed during the recovery and application operation, and a two-way feeding design is adopted to ensure that methyl chloride can continue to be absorbed during the recovery and application operation. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art, and provides a chloromethane continuous recovery and application device. The chloromethane tail gas of the reactor enters the second absorption tower through the first absorption tower and then passes through the gas-liquid separator, or the chloromethane tail gas of the reactor enters the first absorption tower through the second absorption tower and then passes through the gas-liquid separator. When the saturated chloromethane solution is transferred in the absorption tower and new solvent is added, there is no need to stop the machine, and the continuous operation of the absorption device can be achieved, the production efficiency is improved, the uncertain factors in the operation process are reduced, the stability and safety of production are improved, and it also helps to reduce the impact on the environment; through the cooperation of the condenser, the gas-liquid separator, the tail gas valve and the reflux valve, the solvent and the chloromethane in part of the tail gas can be recovered, and then the liquid is returned to the tower through the gas-liquid separator, which can effectively save the use of solvent and chloromethane, reduce production costs, reduce pollution to the environment, and reduce the emission of harmful gases.

[0004] The utility model also provides the above-mentioned methyl chloride continuous recovery and application device, including: a first absorption tower, the outer surface of the first absorption tower is fixedly connected with a first air inlet valve, the outer surface of the first absorption tower is fixedly connected with a third air inlet valve, the outer surface of the first absorption tower is fixedly connected with a first air outlet valve, the outer surface of the first absorption tower is fixedly connected with a first pump, the outer surface of the first absorption tower is fixedly connected with a first tail gas valve, and the outer surface of the first absorption tower is fixedly connected with a first spray valve; the outer surface of the first absorption tower is fixedly connected with a first recovery liquid feed valve; a reactor, the outer surface of the reactor is fixedly connected with a first feed port, the outer surface of the reactor is fixedly connected with a second feed port; the outer surface of the reactor is fixedly connected with a vent valve; a second absorption tower, the outer surface of the second absorption tower is fixedly connected with a second air inlet valve, the outer surface of the second absorption tower is fixedly connected with a fourth air inlet valve, the outer surface of the second absorption tower is fixedly connected with a second air outlet valve, the outer surface of the second absorption tower is fixedly connected with a second Tail gas valve, the outer surface of the second absorption tower is fixedly connected with a second pump, the outer surface of the second absorption tower is fixedly connected with a second spray valve; the outer surface of the second absorption tower is fixedly connected with a second liquid recovery feed valve; condenser, the output end of the condenser is fixedly connected with a gas-liquid separator, and the outer surface of the gas-liquid separator is provided with an exhaust port. Through the cooperation of the first absorption tower, the second absorption tower, the first pump, the second pump, the first feed port and the second feed port, when the absorption tower transfers the saturated methyl chloride solution and adds new solvent, there is no need to stop the machine, and the continuous operation of the absorption device can be achieved, which improves the production efficiency, reduces the uncertainties in the operation process, improves the stability and safety of production, and also helps to reduce the impact on the environment; through the cooperation of the condenser, the gas-liquid separator, the tail gas valve and the reflux valve, the solvent and part of the methyl chloride in the tail gas can be recovered, and then the liquid is returned to the tower through the gas-liquid separator, which can effectively save the use of solvent and methyl chloride, reduce production costs, reduce pollution to the environment, and reduce the emission of harmful gases.

[0005] According to the methyl chloride continuous recovery and utilization device described in the utility model, the first air intake valve and the second air intake valve are connected in series, and the first air intake valve and the second air intake valve are connected to the vent valve of the reactor, which can conveniently control the raw material intake and improve the stability of the device.

[0006] According to the methyl chloride continuous recovery and utilization device of the utility model, the first absorption tower and the second absorption tower are connected in series, and the first absorption tower and the second absorption tower are connected to the reactor, which can improve the continuity and cyclicity of the device, thereby improving production efficiency.

[0007] According to the methyl chloride continuous recovery and utilization device of the utility model, the first pump and the second pump are connected in series, and the first pump and the second pump are connected to the second feed inlet. The methyl chloride saturated solution in the tower can be transferred to the reactor for recovery and utilization through the pump, thereby ensuring the continuity of the equipment.

[0008] According to the methyl chloride continuous recovery and utilization device of the utility model, the first reflux valve and the second reflux valve are connected to the gas-liquid separator, which can recover the methyl chloride in the solvent and part of the tail gas and send them back to the tower, saving production costs.

[0009] According to the methyl chloride continuous recovery and application device of the utility model, the first tail gas valve and the second tail gas valve are connected in series, and the first tail gas valve and the second tail gas valve are connected to the condenser, so that the tail gas can be transported to the condenser to recover the solvent and part of the methyl chloride in the tail gas.

[0010] According to the methyl chloride continuous recovery and utilization device of the utility model, the first absorption tower and the second absorption tower are provided with a sprayer, and the sprayer is provided with a solvent, so that the methyl chloride can be fully absorbed.

[0011] According to the methyl chloride continuous recovery and utilization device of the utility model, the end of the exhaust port away from the gas-liquid separator is fixedly connected to the tail gas absorption system, which can effectively treat the tail gas.

[0012] Beneficial Effects

[0013] 1. Compared with the prior art, the novel methyl chloride continuous recovery and application device, through the cooperation of the first absorption tower, the second absorption tower, the first pump, the second pump, the first feed port and the second feed port, does not need to be shut down when the saturated methyl chloride solution is transferred from the absorption tower and new solvent is added, so the continuous operation of the absorption device can be realized, the production efficiency is improved, the uncertain factors in the operation process are reduced, the stability and safety of production are improved, and it also helps to reduce the impact on the environment.

[0014] 2. Compared with the prior art, the new methyl chloride continuous recovery and application device can recover the solvent and part of the methyl chloride in the tail gas through the cooperation of the condenser, gas-liquid separator, tail gas valve and reflux valve, and then return the liquid to the tower through the gas-liquid separator, which can effectively save the use of solvent and methyl chloride, reduce production costs, reduce pollution to the environment, and reduce the emission of harmful gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0016] Figure 1 The utility model is a schematic diagram of the structure of the methyl chloride continuous recovery and application device.

[0017] Legend:

[0018] 1. Reactor; 101. First feed inlet; 102. Second feed inlet; 2. First absorption tower; 21. Third air inlet valve; 6. Vent valve; 7. First air inlet valve; 25. First air outlet valve; 15. First pump; 23. First tail gas valve; 9. First spray valve; 3. Second absorption tower; 22. Fourth air inlet valve; 8. Second air inlet valve; 35. Second air outlet valve; 16. Second pump; 33. Second tail gas valve; 10. Second spray valve; 4. Condenser; 5. Gas-liquid separator; 14. Exhaust port; 24. First recovery liquid feed valve; 34. Second recovery liquid feed valve. DETAILED DESCRIPTION

[0019] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0020] Reference Figure 1The utility model embodiment of the methyl chloride continuous recovery and application device comprises: a first absorption tower 2, which is used to process materials; a first air inlet valve 7 is fixedly connected to the outer surface of the first absorption tower 2; a third air inlet valve 21 is fixedly connected to the outer surface of the first absorption tower 2 for air intake; a first air outlet valve 25 is fixedly connected to the outer surface of the first absorption tower 2 for air outlet; a first pump 15 is fixedly connected to the outer surface of the first absorption tower 2 for extracting materials; a first tail gas valve 23 is fixedly connected to the outer surface of the first absorption tower 2 for exhausting tail gas; a first spray valve 9 is fixedly connected to the outer surface of the first absorption tower 2 for spraying solvent; a first liquid recovery feed valve 24 is fixedly connected to the outer surface of the first absorption tower 2 for liquid reflux into the tower; a reactor 1, the outer surface of the reactor 1 is fixedly connected to the first feed port 101 for For feeding, the outer surface of the reactor 1 is fixedly connected with a second feed port 102 for feeding; the outer surface of the reactor 1 is fixedly connected with a vent valve 6 for discharging materials; the second absorption tower 3, the outer surface of the second absorption tower 3 is fixedly connected with a second air intake valve 8, the outer surface of the second absorption tower 3 is fixedly connected with a fourth air intake valve 22, the outer surface of the second absorption tower 3 is fixedly connected with a second air outlet valve 35, the outer surface of the second absorption tower 3 is fixedly connected with a second tail gas valve 33, the outer surface of the second absorption tower 3 is fixedly connected with a second pump 16, the outer surface of the second absorption tower 3 is fixedly connected with a second spray valve 10; the outer surface of the second absorption tower 3 is fixedly connected with a second recovered liquid feed valve 34; the condenser 4, the output end of the condenser 4 is fixedly connected with a gas-liquid separator 5 for gas-liquid separation, and the outer surface of the gas-liquid separator 5 is provided with an exhaust port 14 for discharging waste gas.

[0021] The first air inlet valve 7 and the second air inlet valve 8 are connected to the vent valve 6 of the reactor 1 for air intake to the absorption tower. The first absorption tower 2 and the second absorption tower 3 are connected in series. The first absorption tower 2 and the second absorption tower 3 are connected to the reactor 1. The first pump 15 and the second pump 16 are connected to the reactor 1. The first pump 15 and the second pump 16 are connected to the second feed port 102. The first tail gas valve 23 and the second tail gas valve 33 are connected in series. The first tail gas valve 23 and the second tail gas valve 33 are connected to the condenser 4 for discharging the tail gas into the condenser 4. Sprayers are provided in the first absorption tower 2 and the second absorption tower 3 for spraying solvents. The sprayers are provided with the same solvent as that in the reactor for reacting with the raw materials. The exhaust port 14 is fixedly connected to a tail gas absorption system at one end away from the gas-liquid separator 5 for treating the tail gas.

[0022] Working principle: When in use, when the reactor 1 reacts, first open the third air inlet valve 21, the first air outlet valve 25, the second air inlet valve 8, the second tail gas valve 33, and the exhaust port 14 of the gas-liquid separator 5, and then open the first spray valve 9 and the second spray valve 10, all other valves are in a closed state, and open the first pump 15 and the second pump 16. Finally, open the liquid outlet valve of the gas-liquid separator 5, the first recovery liquid feed valve 24, and the reactor chloromethane vent valve 6 in sequence, the chloromethane coming out of the reactor is absorbed by the first absorption tower 2 and the second absorption tower 3, and then the tail gas enters the condenser 4 through the second tail gas valve 33, and then the solvent and part of the chloromethane in the tail gas are recovered through the condenser 4, and then the gas-liquid separator 5 separates the liquid from the gas, and then the liquid flows back to the first absorption tower 2 through the first recovery liquid feed valve 24, and the gas enters the tail gas absorption system, forming a complete chloromethane recovery process. When the first absorption tower 2 is saturated with methyl chloride, first open the fourth air inlet valve 22, the second air outlet valve 35, the third air inlet valve 21, the first tail gas valve 23, the second liquid recovery feed valve 34, the reactor, the condenser 4, the gas-liquid separator 5 and the spray system of the absorption tower to keep the original working state. Then close the other valves. The methyl chloride coming out of the reactor passes through the second absorption tower 3 and then the first absorption tower 2, and then enters the condenser 4 through the first tail gas valve 23, and then the solvent and part of the methyl chloride in the tail gas are recovered through the condenser 4, and then the gas-liquid separator 5 separates the liquid from the gas, and then the liquid flows back to the second absorption tower 3 through the second liquid recovery feed valve 34, and the gas goes to the tail gas absorption system. In the case of the reactor not stopping, a complete methyl chloride recovery process is formed again. When other equipment is operating normally, the first feed port 101 and the second feed port 102 of the reactor are opened, and after the material (chloromethane solution) of the first absorption tower 2 is transferred, the first feed port 101 and the second feed port 102 are closed, and the absorption solvent is replenished to a reasonable liquid level, and then the secondary absorption is performed. After the chloromethane solution in the second absorption tower 3 reaches a saturated state, it is switched to the original absorption system, and then the saturated chloromethane solution in the second absorption tower 3 is transferred to the reactor 1, and the cycle is repeated.

[0023] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A continuous recovery and application device for methyl chloride, characterized in that: include: A first absorption tower (2), wherein a first air inlet valve (7) is fixedly connected to the outer surface of the first absorption tower (2), a third air inlet valve (21) is fixedly connected to the outer surface of the first absorption tower (2), a first air outlet valve (25) is fixedly connected to the outer surface of the first absorption tower (2), a first pump (15) is fixedly connected to the outer surface of the first absorption tower (2), a first tail gas valve (23) is fixedly connected to the outer surface of the first absorption tower (2), and a first spray valve (9) is fixedly connected to the outer surface of the first absorption tower (2); and a first liquid recovery feed valve (24) is fixedly connected to the outer surface of the first absorption tower (2); A reactor (1), wherein a first feed port (101) is fixedly connected to the outer surface of the reactor (1), and a second feed port (102) is fixedly connected to the outer surface of the reactor (1); and a vent valve (6) is fixedly connected to the outer surface of the reactor (1); A second absorption tower (3), wherein a second air inlet valve (8) is fixedly connected to the outer surface of the second absorption tower (3), a fourth air inlet valve (22) is fixedly connected to the outer surface of the second absorption tower (3), a second air outlet valve (35) is fixedly connected to the outer surface of the second absorption tower (3), a second tail gas valve (33) is fixedly connected to the outer surface of the second absorption tower (3), a second pump (16) is fixedly connected to the outer surface of the second absorption tower (3), and a second spray valve (10) is fixedly connected to the outer surface of the second absorption tower (3); and a second liquid recovery feed valve (34) is fixedly connected to the outer surface of the second absorption tower (3); A condenser (4), wherein the output end of the condenser (4) is fixedly connected to a gas-liquid separator (5), and an exhaust port (14) is provided on the outer surface of the gas-liquid separator (5).

2. The methyl chloride continuous recovery and application device according to claim 1, characterized in that: The first air inlet valve (7) and the second air inlet valve (8) are connected to the vent valve (6) of the reactor (1).

3. The methyl chloride continuous recovery and application device according to claim 1, characterized in that: The first absorption tower (2) and the second absorption tower (3) are connected in series, and the first absorption tower (2) and the second absorption tower (3) are connected to the reactor (1).

4. The methyl chloride continuous recovery and application device according to claim 1, characterized in that: The first pump (15) and the second pump (16) are connected to the reactor (1), and the first pump (15) and the second pump (16) are connected to the second feed port (102).

5. The methyl chloride continuous recovery and application device according to claim 1, characterized in that: The first tail gas valve (23) and the second tail gas valve (33) are connected to the gas-liquid separator (5).

6. The methyl chloride continuous recovery and application device according to claim 1, characterized in that: The first tail gas valve (23) and the second tail gas valve (33) are connected in series, and the first tail gas valve (23) and the second tail gas valve (33) are connected to the condenser (4).

7. The methyl chloride continuous recovery and application device according to claim 1, characterized in that: The first absorption tower (2) and the second absorption tower (3) are provided with a sprayer, and the sprayer is provided with the same solvent as that in the reaction kettle.

8. The methyl chloride continuous recovery and utilization device according to claim 1, characterized in that: One end of the exhaust port (14) away from the gas-liquid separator (5) is fixedly connected to a tail gas absorption system.

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