Gas-liquid separation device for hydrofluoric acid production

Abstract

The utility model provides a gas-liquid separation device for hydrofluoric acid production. The gas-liquid separation device comprises a gas-liquid separator, the front end of the gas-liquid separator is connected with a hydrofluoric acid dilution tank, the rear end is connected with a tail gas system, and the bottom is connected with a recycling bin; a tail gas inlet and a tail gas outlet II are formed in the top of the gas-liquid separator, and a hydrofluoric acid liquid outlet is formed in the bottom of the gas-liquid separator. After the hydrofluoric acid tail gas is treated by the device, gas-liquid separation of the hydrofluoric acid tail gas is realized, so that gas enters a tail gas system, liquid hydrofluoric acid is recycled through condensation, and the effects of safe and simple method operation and recycling are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the gas -liquid separation device technical field of hydrofluoric acid production, specifically is a kind of gas-liquid separation device in photovoltaic grade hydrofluoric acid production process. BACKGROUND

[0002] Hydrofluoric acid is a kind of high-toxicity dangerous chemicals, its corrosivity is extremely strong, has strong volatility. Therefore, hydrofluoric acid production process is extremely high to safety requirement. In industrial production, tail gas generated in the dilution process of hydrofluoric acid will enter tail gas system and be handled. However, a certain amount of hydrofluoric acid is often entrained in tail gas, and hydrofluoric acid will cause corrosion to equipment after entering tail gas system, and also increase the processing load of tail gas system, and then reduce the life of tail gas system. In addition, hydrofluoric acid entering tail gas system will also cause resource waste, which is not conducive to environmental protection production.

[0003] Therefore, it is necessary to design a device for producing hydrofluoric acid in an environmentally friendly manner, which can improve the utilization rate of hydrofluoric acid and the service life of the equipment. UTILITY MODEL CONTENT

[0004] In order to solve the above problems, the utility model provides a kind of gas-liquid phase separation device of hydrofluoric acid dilution process tail gas, by increasing gas-liquid separation device, reduce the influence of liquid phase to tail gas system, reduce the processing load of tail gas system, and simultaneously, by gas-liquid separation device, the hydrofluoric acid of liquid phase is recycled and reused, effectively separates gas phase and liquid phase, and improves the operation safety.

[0005] A kind of gas-liquid separation device for hydrofluoric acid production, including gas-liquid separator, gas-liquid separator front end connection hydrofluoric acid dilution tank, rear end connection tail gas system, bottom connection recovery bucket;The gas-liquid separator is equipped with coil pipe, top is equipped with tail gas inlet and tail gas outlet two, bottom is equipped with hydrofluoric acid liquid outlet.

[0006] The coil pipe is made of PFA material.

[0007] The upper end of the hydrofluoric acid dilution tank is provided with a nitrogen inlet and a tail gas outlet one.

[0008] The hydrofluoric acid dilution tank is provided with a pressure sensor.

[0009] The two ends of the coil pipe are respectively a condensate inlet and a condensate outlet.

[0010] The gas-liquid separator is provided with a long tube connected to the tail gas inlet, and the bottom of the long tube is lower than the lowest part of the coil pipe.

[0011] The tail gas outlet one is connected to the tail gas inlet through a pipeline.

[0012] The tail gas outlet two is connected to the tail gas system through a pipeline.

[0013] The hydrofluoric acid liquid outlet is connected with the recovery bucket through a pipeline.

[0014] The utility model discloses the beneficial effects are as follows:

[0015] The device can prevent the hydrofluoric acid liquid from entering the tail gas system, avoid affecting the fan, achieve the purpose of prolonging the service life of the tail gas system, recycle the hydrofluoric acid liquid separated by the gas-liquid separator, sell the hydrofluoric acid according to the industrial grade specification, achieve the energy saving and emission reduction, economic recycling and reuse, and improve the safety during production. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The utility model discloses a device schematic view;

[0017] Figure 2 The utility model discloses a gas-liquid separator device schematic view;

[0018] The figure mark explanation: 1. hydrofluoric acid dilution groove, 2. gas-liquid separator, 3. tail gas system, 4. recovery bucket, 1-1. nitrogen inlet, 1-2. tail gas outlet no. 1, 1-3. pressure sensor, 2-1. tail gas inlet, 2-2. tail gas outlet no. 2, 2-3. hydrofluoric acid liquid outlet, 2-4. condensate inlet, 2-5. condensate outlet, 2-6. coil. DETAILED DESCRIPTION

[0019] The embodiments of the utility model will be described in detail below in combination with examples, and the following examples are only used for describing the utility model and should not be regarded as limiting the scope of the utility model.

[0020] Example 1

[0021] A kind of gas-liquid separation device for hydrofluoric acid production, including gas-liquid separator 2, gas-liquid separator 2 front end connection hydrofluoric acid dilution groove 1, rear end connection tail gas system 3, bottom connection recovery bucket 4, the gas-liquid separator 2 is equipped with coil 2-6 in, top is equipped with tail gas inlet 2-1 and tail gas outlet no. 2 2-2, bottom is equipped with hydrofluoric acid liquid outlet 2-3.

[0022] The coil 2-6 is made of PFA material.

[0023] The upper end of the hydrofluoric acid dilution groove 1 is provided with a nitrogen inlet 1-1 and a tail gas outlet 1-2.

[0024] The hydrofluoric acid dilution groove 1 is provided with a pressure sensor 1-3.

[0025] The two ends of the coil 2-6 are respectively a condensate inlet 2-4 and a condensate outlet 2-5.

[0026] The gas-liquid separator 2 is provided with a long tube connected to the tail gas inlet 2-1, and the bottom of the long tube is lower than the lowest part of the coil 2-6.

[0027] The tail gas outlet one 1-2 is connected to the tail gas inlet 2-1 through a pipeline.

[0028] The tail gas outlet two 2-2 is connected to the tail gas system 3 through a pipeline.

[0029] The hydrogen fluoride acid liquid outlet 2-3 is connected to the recovery barrel 4 through a pipeline.

[0030] Example 2

[0031] The working principle of the utility model is as follows:

[0032] The device of example 1 is adopted, and the hydrogen fluoride acid produced by the front process is diluted in the hydrogen fluoride acid dilution tank 1. The pressure sensor 1-3 monitors the internal pressure of the hydrogen fluoride acid dilution tank 1. When the pressure in the tank is lower than the set pressure, nitrogen enters the hydrogen fluoride acid dilution tank 1 through the nitrogen inlet 1-1 to pressurize the hydrogen fluoride acid dilution tank 1. When the pressure in the tank is higher than the set pressure, the HF gas in the hydrogen fluoride acid dilution tank 1 is discharged through the tail gas outlet one 1-2 to depressurize the hydrogen fluoride acid dilution tank 1. During the depressurization process, a small amount of liquid hydrogen fluoride acid is carried out of the hydrogen fluoride acid dilution tank 1 by the HF gas, enters the gas-liquid separator 2 through the tail gas inlet 2-1. The coil in the gas-liquid separator 2 is supplied with ice water, the gaseous HF is liquefied by condensation, and flows into the recovery barrel 4 at the bottom of the gas-liquid separator 2 together with the liquid hydrogen fluoride acid. The remaining gaseous tail gas in the gas-liquid separator 2 flows out through the tail gas outlet two 2-2, enters the tail gas system 3, and is treated. The hydrogen fluoride acid recovered by the recovery barrel 4 can be sold according to the specifications of industrial grade.

Claims

1. A gas-liquid separation device for hydrofluoric acid production, characterized in that: The invention comprises a gas-liquid separator (2), wherein the front end of the gas-liquid separator (2) is connected to a hydrofluoric acid dilution tank (1), the rear end is connected to an exhaust system (3), and the bottom is connected to a recovery barrel (4); the gas-liquid separator (2) is provided with a coil (2-6) inside, an exhaust inlet (2-1) and an exhaust outlet (2-2) at the top, and a hydrofluoric acid liquid outlet (2-3) at the bottom.

2. A gas-liquid separation device for hydrofluoric acid production according to claim 1, characterized in that: The coil (2-6) is made of PFA material.

3. A gas-liquid separation device for hydrofluoric acid production according to claim 1, characterized in that: The upper end of the hydrofluoric acid dilution tank (1) is provided with a nitrogen inlet (1-1) and an exhaust gas outlet (1-2).

4. A gas-liquid separation device for hydrofluoric acid production according to claim 1, characterized in that: The hydrofluoric acid dilution tank (1) is provided with a pressure sensor (1-3).

5. A gas-liquid separation device for hydrofluoric acid production according to claim 1, characterized in that: The two ends of the coil (2-6) are respectively a condensate inlet (2-4) and a condensate outlet (2-5).

6. A gas-liquid separation device for hydrofluoric acid production according to claim 1, characterized in that: A long tube connected to the tail gas inlet (2-1) is provided in the gas-liquid separator (2), and the bottom of the long tube is lower than the lowest point of the coil (2-6).

7. A gas-liquid separation device for hydrofluoric acid production according to claim 3, characterized in that: The tail gas outlet 1 (1-2) is connected to the tail gas inlet (2-1) through a pipeline.

8. The gas-liquid separation device for hydrofluoric acid production according to claim 1, characterized in that: The tail gas outlet 2 (2-2) is connected to the tail gas system (3) through a pipeline.

9. The gas-liquid separation device for hydrofluoric acid production according to claim 1, characterized in that: The hydrofluoric acid liquid outlet (2-3) is connected to the recovery barrel (4) through a pipeline.

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