A phenolic solvent distillation apparatus

Abstract

The utility model provides a kind of phenol-containing solvent distillation device, including retort, condenser, receiving tube, compressor, cooler, gas-liquid separator, recovery kettle, adsorption column, buffer tank and preheater, using above-mentioned technical scheme, the effect of heating to circulating nitrogen using preheater, ensure that the temperature of the whole distillate flow path from condenser outlet to receiving tank is always higher than the freezing point of phenol, thereby eliminating the problem of equipment blockage caused by phenol crystallization, and using nitrogen circulation mechanism, the toxic phenol vapor is completely enclosed in the system, to ensure the health and safety of operators, at the same time, through the purification and regeneration mechanism composed of compressor, gas-liquid separator and adsorption column, nitrogen is circulated in the system, only a small amount of loss needs to be supplemented, nitrogen consumption is low, and the operation cost is low.

Description

Technical Field

[0001] This utility model relates to the field of distillation, and in particular to a distillation apparatus containing phenol solvent. Background Technology

[0002] Currently, most industrial and laboratory equipment used for distilling phenolic solvents is traditional atmospheric or simple vacuum distillation equipment. Such equipment typically consists of basic units such as a distillation vessel, a condenser, and a receiving tank. In actual distillation operations, because phenolic substances have high freezing points (e.g., phenol is about 40-41℃), the distilled phenol vapor condenses into a liquid state in the condenser. However, on its way to the receiving tank, if the temperature of the pipeline or the receiving tank itself falls below its freezing point, the liquid phenol will quickly crystallize and solidify, causing blockages in the condenser outlet, the delivery pipeline, and the receiving tank. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the aforementioned problems in the prior art, this invention provides a phenol-containing solvent distillation apparatus.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] A phenol-containing solvent distillation apparatus includes a distillation kettle, a condenser, a receiving tube, a compressor, a cooler, a gas-liquid separator, a recovery kettle, an adsorption column, a buffer tank, and a preheater.

[0008] The steam outlet of the distillation vessel is connected to the condenser via a conduit;

[0009] The condensate outlet of the condenser tube is connected to the receiving tube;

[0010] The receiving pipe is connected to the air intake of the compressor via a pipeline, and the air outlet of the compressor is connected to the cooler;

[0011] The cooler is connected to the gas-liquid separator via a pipeline;

[0012] The liquid outlet of the gas-liquid separator is connected to the buffer tank, and the gas outlet of the gas-liquid separator is connected to the adsorption column;

[0013] The adsorption column is connected to the buffer tank via a pipeline;

[0014] The outlet of the buffer tank is connected to the preheater;

[0015] The preheater is connected to the bottom of one end of the condenser inlet via a pipeline.

[0016] Preferably, the compressor is a diaphragm compressor.

[0017] Preferably, the cooler includes a cooling pipe and a cooling jacket surrounding the cooling pipe, wherein ice water circulates within the cooling jacket, and the cooling temperature of the cooler is 0-5°C.

[0018] Preferably, the adsorbent of the adsorption column is activated carbon or molecular sieve.

[0019] Preferably, the buffer tank is equipped with a pressure control valve.

[0020] Preferably, the preheater has a preheating tube and a preheating jacket surrounding the preheating tube, with hot water circulating inside the preheating jacket, and the preheater has a heating temperature of 50-60°C.

[0021] (III) Beneficial Effects

[0022] The beneficial effects of this utility model are as follows: By using the above technical solution, the preheater heats the circulating nitrogen, ensuring that the temperature of the entire distillation flow path from the condenser outlet to the receiving tank is always higher than the freezing point of phenol, thereby eliminating the problem of equipment blockage caused by phenol crystallization. Furthermore, the nitrogen circulation mechanism completely encloses the toxic phenol vapor inside the system, ensuring the health and safety of the operators. At the same time, the purification and regeneration mechanism composed of a compressor, gas-liquid separator, and adsorption column allows nitrogen to circulate within the system, requiring only a small amount of replenishment, resulting in low nitrogen consumption and low operating costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a phenol-containing solvent distillation apparatus.

[0024] [Explanation of Labels in the Attached Image]

[0025] 1. Distillation vessel;

[0026] 2. Condenser;

[0027] 3. Receiving tube;

[0028] 4. Compressor;

[0029] 5. Cooler;

[0030] 6. Gas-liquid separator;

[0031] 7. Recycling vessel;

[0032] 8. Adsorption column;

[0033] 9. Buffer tank;

[0034] 10. Preheater. Detailed Implementation

[0035] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Please refer to Figure 1 This utility model provides a distillation apparatus for phenol-containing solvents, including a distillation kettle 1, a condenser 2, a receiving tube 3, a compressor 4, a cooler 5, a gas-liquid separator 6, a recovery kettle 7, an adsorption column 8, a buffer tank 9, and a preheater 10.

[0037] The steam outlet of distillation vessel 1 is connected to condenser 2 via a conduit;

[0038] The condensate outlet of condenser 2 is connected to receiver 3;

[0039] The receiving pipe 3 is connected to the suction port of the compressor 4 through a pipeline, and the discharge port of the compressor 4 is connected to the cooler 5.

[0040] Cooler 5 is connected to gas-liquid separator 6 via a pipeline;

[0041] The liquid outlet of the gas-liquid separator 6 is connected to the buffer tank 9, and the gas outlet of the gas-liquid separator 6 is connected to the adsorption column 8.

[0042] Adsorption column 8 is connected to buffer tank 9 via pipeline;

[0043] The outlet of the buffer tank 9 is connected to the preheater 10;

[0044] The preheater 10 is connected to the bottom of one end of the condenser tube 2 inlet via a pipeline;

[0045] In use, the air in the circulation pipeline of this application is first purged with fresh nitrogen. The phenol-containing solvent is then distilled through the distillation vessel 1. The distilled phenol vapor enters the condenser 2 for condensation. Simultaneously, nitrogen is circulated into the condenser 2 through the compressor 4, carrying the condensate to the receiver to prevent crystallization. The nitrogen rich in phenol vapor is extracted from the top of the receiver by the compressor 4 and sent to the cooler 5. The cooler 5 condenses most of the volatilized phenol vapor and any entrained solvent vapor into liquid. The gas-liquid mixture exiting the cooler 5... The liquid phenol is separated in the gas-liquid separator 6 and collected in the recovery vessel 7, thereby removing most of the phenol. The gas coming out of the gas-liquid separator 6 still contains saturated concentration of phenol vapor, which is adsorbed by the adsorption column 8. The purified high-purity nitrogen enters the buffer tank 9 to provide a stable gas source for the system. The preheater 10 is used to heat the circulating nitrogen, ensuring that the temperature of the entire distillation flow path from the condenser outlet to the receiving tank is always higher than the freezing point of phenol. After being heated by the preheater 10, the nitrogen re-enters the condenser tube 2 to realize nitrogen circulation.

[0046] During operation, nitrogen can be reused, resulting in low operating costs. It can also effectively recover phenol and prevent phenol crystallization and blockage in the condenser tube 2 by using nitrogen purging.

[0047] In this embodiment, the compressor 4 is a diaphragm compressor 4.

[0048] In this embodiment, the cooler 5 includes a cooling pipe and a cooling jacket surrounding the cooling pipe. Ice water circulates inside the cooling jacket, and the cooling temperature of the cooler 5 is 0-5℃.

[0049] In this embodiment, the adsorbent for the adsorption column 8 is activated carbon or molecular sieve.

[0050] In this embodiment, a pressure control valve is provided on the buffer tank 9.

[0051] In this embodiment, the preheater 10 has a preheating pipe and a preheating jacket surrounding the preheating pipe. Hot water circulates inside the preheating jacket, and the heating temperature of the preheater 10 is 50-60°C.

[0052] The working principle of this utility model is as follows;

[0053] First, the air in the circulation pipeline of this application is purged with fresh nitrogen. The phenol-containing solvent is distilled through the distillation vessel 1. The distilled phenol vapor enters the condenser 2 for condensation. At the same time, nitrogen is circulated into the condenser 2 through the compressor 4, which carries the condensate to the receiver to prevent crystallization. The nitrogen rich in phenol vapor is extracted from the top of the receiver by the compressor 4 and sent to the cooler 5. The cooler 5 condenses most of the volatilized phenol vapor and any entrained solvent vapor into liquid. The gas-liquid mixture from the cooler 5 enters the gas-liquid separator 6, where the liquid phenol is separated and collected through the recovery vessel 7, thus removing most of the phenol. The gas from the gas-liquid separator 6 still contains saturated concentration of phenol vapor, which is adsorbed by the adsorption column 8. The purified high-purity nitrogen enters the buffer tank 9 to provide a stable gas source for the system. After being heated by the preheater 10, it re-enters the condenser 2 to achieve nitrogen circulation.

[0054] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0055] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A distillation apparatus for phenol-containing solvents, characterized in that, It includes a distillation vessel, condenser, receiving pipe, compressor, cooler, gas-liquid separator, recovery vessel, adsorption column, buffer tank, and preheater; The steam outlet of the distillation vessel is connected to the condenser via a conduit; The condensate outlet of the condenser tube is connected to the receiving tube; The receiving pipe is connected to the air intake of the compressor via a pipeline, and the air outlet of the compressor is connected to the cooler; The cooler is connected to the gas-liquid separator via a pipeline; The liquid outlet of the gas-liquid separator is connected to the buffer tank, and the gas outlet of the gas-liquid separator is connected to the adsorption column; The adsorption column is connected to the buffer tank via a pipeline; The outlet of the buffer tank is connected to the preheater; The preheater is connected to the bottom of one end of the condenser inlet via a pipeline.

2. The phenol-containing solvent distillation apparatus according to claim 1, characterized in that, The compressor is a diaphragm compressor.

3. The phenol-containing solvent distillation apparatus according to claim 1, characterized in that, The cooler includes a cooling pipe and a cooling jacket surrounding the cooling pipe. Ice water circulates inside the cooling jacket. The cooling temperature of the cooler is 0-5℃.

4. The phenol-containing solvent distillation apparatus according to claim 1, characterized in that, The adsorbent used in the adsorption column is activated carbon or molecular sieve.

5. The phenol-containing solvent distillation apparatus according to claim 1, characterized in that, A pressure control valve is installed on the buffer tank.

6. The phenol-containing solvent distillation apparatus according to claim 1, characterized in that, The preheater has a preheating tube and a preheating jacket surrounding the preheating tube. Hot water circulates within the preheating jacket. The heating temperature of the preheater is 50-60℃.

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