Preparation method for producing high-purity hydrochloric acid from monochlorodifluoromethane byproduct HCL

Abstract

The invention belongs to the technical field of preparation of high-purity hydrochloric acid, particularly relates to a preparation method for producing high-purity hydrochloric acid from a monochlorodifluoromethane byproduct HCL, and aims to solve the problems that in the existing preparation process of the high-purity hydrochloric acid, sufficient impurity removal of hydrogen chloride gas is inconvenient, impurities in the high-purity hydrochloric acid cannot be monitored in real time, and the purity of the high-purity hydrochloric acid is influenced. According to the technical scheme, the method comprises the following steps: S1, collecting an organic mixture obtained in production of monochlorodifluoromethane, and condensing and filtering the organic mixture; s2, primarily separating the condensed and filtered organic mixture to obtain crude hydrogen chloride; s3, washing the crude hydrogen chloride to remove impurities; s4, carrying out absorption reaction on the washed hydrogen chloride to obtain high-purity hydrochloric acid; in the preparation process of the high-purity hydrochloric acid, sufficient impurity removal can be conveniently performed on hydrogen chloride gas, and impurities in the high-purity hydrochloric acid can be monitored in real time, so that the preparation quality of the high-purity hydrochloric acid is effectively ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of high-purity hydrochloric acid preparation, and in particular to a preparation method for producing high-purity hydrochloric acid from by-product HCL of difluorochloromethane. Background Art

[0002] The production of difluorochloromethane uses chloroform and HF as raw materials. The two react in a fluorination reactor according to a certain ratio to produce difluorochloromethane, and the by-product is HCL. Through high-pressure and low-temperature rectification, HCL is separated from the top of the tower. This HCL contains 100-200 ppm of HF, about 1.5% of F23, about 0.2% of F22, and 70-100 ppm of free chlorine. After traditional technology adsorbs HF with AL2O3, it is absorbed with water to produce 31% hydrochloric acid. Due to its high impurity content, the produced 31% hydrochloric acid has low added value and does not meet the environmental protection requirements.

[0003] In the prior art, during the preparation of high-purity hydrochloric acid, it is not convenient to fully remove impurities from hydrogen chloride gas, and it is impossible to monitor impurities in high hydrochloric acid in real time, resulting in a reduction in the preparation quality of high-purity hydrochloric acid. For this reason, we propose a preparation method for producing high-purity hydrochloric acid from by-product HCL of difluorochloromethane to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages that in the prior art, during the preparation of high-purity hydrochloric acid, it is not convenient to fully remove impurities from hydrogen chloride gas, and it is impossible to monitor impurities in high hydrochloric acid in real time, resulting in a reduction in the preparation quality of high-purity hydrochloric acid, and to propose a preparation method for producing high-purity hydrochloric acid from by-product HCL of difluorochloromethane.

[0005] A preparation method for producing high-purity hydrochloric acid from by-product HCL of difluorochloromethane provided by this application adopts the following technical scheme:

[0006] A preparation method for producing high-purity hydrochloric acid from by-product HCL of difluorochloromethane includes the following steps:

[0007] S1: Collect the organic mixture obtained in the production of difluorochloromethane and perform condensation filtration;

[0008] S2: Perform preliminary separation on the condensed and filtered organic mixture to obtain crude hydrogen chloride;

[0009] S3: Wash and remove impurities from the crude hydrogen chloride;

[0010] S4: Perform absorption reaction on the washed hydrogen chloride to obtain high-purity hydrochloric acid;

[0011] S5: Perform cyclic adsorption on the high-purity hydrochloric acid;

[0012] S6: Take a sample of the high-purity hydrochloric acid after cyclic adsorption treatment for analysis;

[0013] S7: Package and store the qualified high-purity hydrochloric acid.

[0014] Furthermore, in S1, the organic mixture obtained in the production of chlorodifluoromethane is collected by a collection mechanism, and the collected organic mixture is transported by a transport mechanism to a condenser for condensation. The preset temperature of the condenser is -10°C - -50°C.

[0015] Furthermore, in S1, the condensed gas-liquid mixture is transported by a transport mechanism to a gas-liquid separator for treatment, and the hydrogen chloride gas is filtered and adsorbed by an activated carbon adsorption layer.

[0016] Furthermore, in S2, the condensed liquid is refluxed into the separation tower by a reflux mechanism, and the temperature and pressure of the separation tower are controlled by a control device to separate the crude hydrogen chloride gas. The preset temperature of the separation tower is 100°C - 200°C, and the preset pressure of the separation tower is 490 Pa - 2900 Pa.

[0017] Furthermore, in S3, the crude hydrogen chloride gas is transported by a transport mechanism to a scrubbing tower for scrubbing and impurity removal, and the hydrogen chloride gas is scrubbed cyclically by a circulation mechanism.

[0018] Furthermore, in S4, the hydrogen chloride gas after scrubbing and impurity removal is transported by a transport mechanism to a falling film absorber for absorption reaction to generate high-purity hydrochloric acid. The falling film absorber is provided with three stages and is connected in series in sequence.

[0019] Furthermore, in S5, the obtained high-purity hydrochloric acid is transported to an adsorption bed by a circulation pump, and the high-purity hydrochloric acid is transported cyclically by a circulation mechanism. A monitoring device is provided on the circulation mechanism, and the monitoring device is used to monitor the impurities in the high-purity hydrochloric acid.

[0020] Furthermore, in S6, a sample of the generated high-purity hydrochloric acid finished product is taken by a sampling mechanism, the obtained sample is transported to an analyzer by a transport mechanism, and the high-purity hydrochloric acid can be analyzed by the analyzer. The qualified concentration threshold of the high-purity hydrochloric acid is 11.33 - 12.02 mol / L.

[0021] Furthermore, in S6, a cleaning mechanism and a timing control mechanism are provided on the analyzer. The cleaning mechanism is used to clean the analyzer, and the timing control mechanism is used to start the cleaning mechanism at a fixed time.

[0022] Furthermore, in S7, the qualified high-purity hydrochloric acid is filled and packaged by a filling mechanism, and the packaged high-purity hydrochloric acid is transported and stored by a transportation and storage device.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. In this solution, the collected organic mixture is transported to the condenser for condensation by the transport mechanism, the condensed gas-liquid mixture is transported to the gas-liquid separator for treatment, the hydrogen chloride gas is filtered and adsorbed by the activated carbon adsorption layer, and at the same time, the hydrogen chloride gas is circularly washed by the circulation mechanism, and the washed hydrochloric acid is fully absorbed and reacted, thereby effectively improving the impurity removal effect and ensuring the preparation quality.

[0025] 2. In this solution, the obtained high-concentration hydrochloric acid is transported to the adsorption bed by the circulation pump, and the high-concentration hydrochloric acid is circularly transported by the circulation mechanism to ensure sufficient adsorption treatment of the high-purity hydrochloric acid. At the same time, the impurities in the high-concentration hydrochloric acid can be monitored by the monitoring device.

[0026] The present invention can facilitate the full removal of impurities from hydrogen chloride gas during the preparation of high-purity hydrochloric acid and can monitor the impurities in the high-concentration hydrochloric acid in real time, thereby effectively ensuring the preparation quality of high-purity hydrochloric acid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flowchart of a preparation method for producing high-purity hydrochloric acid from by-product HCL of dichlorofluoromethane proposed by the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0029] Embodiment 1

[0030] Refer to Figure 1 , a preparation method for producing high-purity hydrochloric acid from by-product HCL of dichlorofluoromethane, including the following steps:

[0031] S1: Collect the organic mixture obtained in the production of dichlorofluoromethane and perform condensation and filtration.

[0032] S2: Preliminarily separate the condensed and filtered organic mixture to obtain crude hydrogen chloride.

[0033] S3: Wash and remove impurities from the crude hydrogen chloride.

[0034] S4: Perform absorption reaction on the washed hydrogen chloride to obtain high-purity hydrochloric acid.

[0035] S5: Perform cyclic adsorption on the high-purity hydrochloric acid.

[0036] S6: Take a sample and analyze the high-purity hydrochloric acid after cyclic adsorption treatment.

[0037] S7: Package and store the qualified high-purity hydrochloric acid.

[0038] In this embodiment, in S1, the organic mixture obtained in the production of chlorodifluoromethane is collected by the collection mechanism, and the collected organic mixture is transported to the condenser by the transportation mechanism for condensation. The preset temperature of the condenser is -10°C.

[0039] In this embodiment, in S1, the condensed gas-liquid mixture is transported to the gas-liquid separator by the transportation mechanism for treatment, and the hydrogen chloride gas is filtered and adsorbed by the activated carbon adsorption layer.

[0040] In this embodiment, in S2, the condensed liquid is refluxed into the separation tower by the reflux mechanism, and the temperature and pressure of the separation tower are controlled by the control device to separate the crude hydrogen chloride gas. The preset temperature of the separation tower is 100°C, and the preset pressure of the separation tower is 490 Pa.

[0041] In this embodiment, in S3, the crude hydrogen chloride gas is transported to the washing tower by the transportation mechanism for washing and impurity removal, and the hydrogen chloride gas is washed cyclically by the circulation mechanism.

[0042] In this embodiment, in S4, the hydrogen chloride gas after washing and impurity removal is transported to the falling film absorber by the transportation mechanism for absorption reaction to generate high-purity hydrochloric acid. The falling film absorber has three stages and is connected in series in sequence.

[0043] In this embodiment, in S5, the obtained high hydrochloric acid is transported to the adsorption bed by the circulating pump, and the high hydrochloric acid is transported cyclically by the circulation mechanism. A monitoring device is provided on the circulation mechanism, and the monitoring device is used to monitor the impurities in the high hydrochloric acid.

[0044] In this embodiment, in S6, the high-purity hydrochloric acid product is sampled by the sampling mechanism, the obtained sample is transported to the analyzer by the transportation mechanism, and the high-purity hydrochloric acid can be analyzed by the analyzer. The qualified concentration threshold of the high-purity hydrochloric acid is 11.33 - 12.02 mol / L.

[0045] In this embodiment, in S6, a cleaning mechanism and a timing control mechanism are provided on the analyzer. The cleaning mechanism is used to clean the analyzer, and the timing control mechanism is used to start the cleaning mechanism regularly.

[0046] In this embodiment, in S7, the qualified high-purity hydrochloric acid is filled and packaged by the filling mechanism, and the packaged high-purity hydrochloric acid is transported and stored by the transportation and storage device.

[0047] The implementation principle in this embodiment is:

[0048] Embodiment Two

[0049] Reference Figure 1 , a preparation method of high-purity hydrochloric acid produced from by-product HCL of dichlorofluoromethane, comprising the following steps:

[0050] S1: Collect the organic mixture obtained in the production of dichlorofluoromethane, and condense and filter it;

[0051] S2: Preliminarily separate the condensed and filtered organic mixture to obtain crude hydrogen chloride;

[0052] S3: Wash and remove impurities from the crude hydrogen chloride;

[0053] S4: Carry out an absorption reaction on the washed hydrogen chloride to obtain high-purity hydrochloric acid;

[0054] S5: Carry out cyclic adsorption on the high-purity hydrochloric acid;

[0055] S6: Take a sample and analyze the high-purity hydrochloric acid after cyclic adsorption treatment;

[0056] S7: Package and store the qualified high-purity hydrochloric acid.

[0057] In this embodiment, in S1, the organic mixture obtained in the production of dichlorofluoromethane is collected by a collection mechanism, and the collected organic mixture is transported to a condenser by a transport mechanism for condensation. The preset temperature of the condenser is -20°C.

[0058] In this embodiment, in S1, the condensed gas-liquid mixture is transported to a gas-liquid separator by a transport mechanism for treatment, and the hydrogen chloride gas is filtered and adsorbed by an activated carbon adsorption layer.

[0059] In this embodiment, in S2, the condensed liquid is refluxed to the separation tower by a reflux mechanism, and the temperature and pressure of the separation tower are controlled by a control device to separate the crude hydrogen chloride gas. The preset temperature of the separation tower is 120°C, and the preset pressure of the separation tower is 980 Pa.

[0060] In this embodiment, in S3, the crude hydrogen chloride gas is transported to a washing tower by a transport mechanism for washing and removing impurities, and the hydrogen chloride gas is cyclically washed by a circulation mechanism.

[0061] In this embodiment, in S4, the hydrogen chloride gas after washing and removing impurities is transported to a falling film absorber by a transport mechanism for an absorption reaction to generate high-purity hydrochloric acid. The falling film absorber is provided with three stages and is connected in series in sequence.

[0062] In this embodiment, in S5, the obtained high-purity hydrochloric acid is transported to an adsorption bed by a circulation pump, and the high-purity hydrochloric acid is cyclically transported by a circulation mechanism. A monitoring device is arranged on the circulation mechanism, and the monitoring device is used to monitor the impurities in the high-purity hydrochloric acid.

[0063] In this embodiment, in S6, the generated high-purity hydrochloric acid product is sampled by a sampling mechanism, and the obtained sample is transported to an analyzer by a transport mechanism. The analyzer can analyze the high-purity hydrochloric acid, and the qualified concentration threshold of the high-purity hydrochloric acid is 11.33 - 12.02 mol / L.

[0064] In this embodiment, in S6, a cleaning mechanism and a timing control mechanism are provided on the analyzer. The cleaning mechanism is used to clean the analyzer, and the timing control mechanism is used to start the cleaning mechanism at a fixed time.

[0065] In this embodiment, in S7, the qualified high-purity hydrochloric acid is filled and packaged by a filling mechanism, and the packaged high-purity hydrochloric acid is transported and stored by a transportation and storage device.

[0066] Embodiment Three

[0067] Refer to Figure 1 , a preparation method for producing high-purity hydrochloric acid from by-product HCL of dichlorofluoromethane, comprising the following steps:

[0068] S1: Collect the organic mixture obtained in the production of dichlorofluoromethane and perform condensation and filtration;

[0069] S2: Preliminarily separate the condensed and filtered organic mixture to obtain crude hydrogen chloride;

[0070] S3: Wash and remove impurities from the crude hydrogen chloride;

[0071] S4: Perform an absorption reaction on the washed hydrogen chloride to obtain high-purity hydrochloric acid;

[0072] S5: Perform cyclic adsorption on the high-purity hydrochloric acid;

[0073] S6: Sample and analyze the high-purity hydrochloric acid after cyclic adsorption treatment;

[0074] S7: Package and store the qualified high-purity hydrochloric acid.

[0075] In this embodiment, in S1, the organic mixture obtained in the production of dichlorofluoromethane is collected by a collection mechanism, and the collected organic mixture is transported to a condenser by a transport mechanism for condensation. The preset temperature of the condenser is -30°C.

[0076] In this embodiment, in S1, the condensed gas-liquid mixture is transported to a gas-liquid separator by a transport mechanism for treatment, and the hydrogen chloride gas is filtered and adsorbed by an activated carbon adsorption layer.

[0077] In this embodiment, in S2, the condensed liquid is refluxed into the separation column through the reflux mechanism, and the temperature and pressure of the separation column are controlled by the control device to separate the crude hydrogen chloride gas. The preset temperature of the separation column is 140 °C, and the preset pressure of the separation column is 1300 Pa.

[0078] In this embodiment, in S3, the crude hydrogen chloride gas is transported to the scrubbing tower through the transport mechanism for scrubbing and impurity removal, and the hydrogen chloride gas is circulated and scrubbed through the circulation mechanism.

[0079] In this embodiment, in S4, the hydrogen chloride gas after scrubbing and impurity removal is transported to the falling film absorber through the transport mechanism for absorption reaction to produce high-purity hydrochloric acid. The falling film absorber is provided with three stages and is connected in series in sequence.

[0080] In this embodiment, in S5, the obtained high-concentration hydrochloric acid is transported to the adsorption bed through the circulation pump, and the high-concentration hydrochloric acid is circulated and transported through the circulation mechanism. A monitoring device is provided on the circulation mechanism, and the monitoring device is used to monitor the impurities in the high-concentration hydrochloric acid.

[0081] In this embodiment, in S6, the high-purity hydrochloric acid product is sampled through the sampling mechanism, and the obtained sample is transported to the analyzer through the transport mechanism. The high-purity hydrochloric acid can be analyzed by the analyzer. The qualified concentration threshold of the high-purity hydrochloric acid is 11.33 - 12.02 mol / L.

[0082] In this embodiment, in S6, a cleaning mechanism and a timing control mechanism are provided on the analyzer. The cleaning mechanism is used to clean the analyzer, and the timing control mechanism is used to start the cleaning mechanism at a fixed time.

[0083] In this embodiment, in S7, the qualified high-purity hydrochloric acid is filled and packaged through the filling mechanism, and the packaged high-purity hydrochloric acid is transported and stored through the transportation and storage device.

[0084] Embodiment Four

[0085] Refer to Figure 1 , a preparation method for producing high-purity hydrochloric acid from by-product HCL of dichlorofluoromethane, comprising the following steps:

[0086] S1: Collect the organic mixture obtained in the production of dichlorofluoromethane and condense and filter it;

[0087] S2: Preliminarily separate the condensed and filtered organic mixture to obtain crude hydrogen chloride;

[0088] S3: Wash and remove impurities from the crude hydrogen chloride;

[0089] S4: Carry out an absorption reaction on the washed hydrogen chloride to obtain high-purity hydrochloric acid;

[0090] S5: Recycle and adsorb high-purity hydrochloric acid;

[0091] S6: Take samples of the high-purity hydrochloric acid after recycle adsorption treatment for analysis;

[0092] S7: Package and store the qualified high-purity hydrochloric acid.

[0093] In this embodiment, in S1, the organic mixture obtained in the production of chlorodifluoromethane is collected by a collection mechanism, and the collected organic mixture is transported to a condenser by a transport mechanism for condensation. The preset temperature of the condenser is -40°C.

[0094] In this embodiment, in S1, the condensed gas-liquid mixture is transported to a gas-liquid separator by a transport mechanism for treatment, and hydrogen chloride gas is filtered and adsorbed by an activated carbon adsorption layer.

[0095] In this embodiment, in S2, the condensed liquid is refluxed into the separation tower by a reflux mechanism, and the temperature and pressure of the separation tower are controlled by a control device to separate crude hydrogen chloride gas. The preset temperature of the separation tower is 160°C, and the preset pressure of the separation tower is 1800 Pa.

[0096] In this embodiment, in S3, the crude hydrogen chloride gas is transported to a scrubbing tower by a transport mechanism for scrubbing and impurity removal, and the hydrogen chloride gas is scrubbed cyclically by a recycle mechanism.

[0097] In this embodiment, in S4, the hydrogen chloride gas after scrubbing and impurity removal is transported to a falling film absorber by a transport mechanism for absorption reaction to generate high-purity hydrochloric acid. The falling film absorber has three stages and is connected in series in sequence.

[0098] In this embodiment, in S5, the obtained high-purity hydrochloric acid is transported to an adsorption bed by a recycle pump, and the high-purity hydrochloric acid is transported cyclically by a recycle mechanism. A monitoring device is provided on the recycle mechanism, and the monitoring device is used to monitor impurities in the high-purity hydrochloric acid.

[0099] In this embodiment, in S6, samples of the generated high-purity hydrochloric acid product are taken by a sampling mechanism, and the obtained samples are transported to an analyzer by a transport mechanism. The high-purity hydrochloric acid can be analyzed by the analyzer. The qualified concentration threshold of the high-purity hydrochloric acid is 11.33 - 12.02 mol / L.

[0100] In this embodiment, in S6, a cleaning mechanism and a timing control mechanism are provided on the analyzer. The cleaning mechanism is used to clean the analyzer, and the timing control mechanism is used to start the cleaning mechanism at a fixed time.

[0101] In this embodiment, in S7, the qualified high-purity hydrochloric acid is filled and packaged by a filling mechanism, and the packaged high-purity hydrochloric acid is transported and stored by a transportation and storage device.

[0102] Example 5

[0103] Refer to Figure 1 , a preparation method of high-purity hydrochloric acid produced from by-product HCL of dichlorofluoromethane, comprising the following steps:

[0104] S1: Collect the organic mixture obtained in the production of dichlorofluoromethane, and condense and filter it;

[0105] S2: Preliminarily separate the condensed and filtered organic mixture to obtain crude hydrogen chloride;

[0106] S3: Wash and remove impurities from the crude hydrogen chloride;

[0107] S4: Carry out an absorption reaction on the washed hydrogen chloride to obtain high-purity hydrochloric acid;

[0108] S5: Carry out cyclic adsorption on the high-purity hydrochloric acid;

[0109] S6: Take a sample and analyze the high-purity hydrochloric acid after cyclic adsorption treatment;

[0110] S7: Package and store the qualified high-purity hydrochloric acid.

[0111] In this embodiment, in S1, the organic mixture obtained in the production of dichlorofluoromethane is collected by a collection mechanism, and the collected organic mixture is transported by a transport mechanism to a condenser for condensation. The preset temperature of the condenser is -50°C.

[0112] In this embodiment, in S1, the condensed gas-liquid mixture is transported by a transport mechanism to a gas-liquid separator for treatment, and the hydrogen chloride gas is filtered and adsorbed by an activated carbon adsorption layer.

[0113] In this embodiment, in S2, the condensed liquid is refluxed to the separation tower by a reflux mechanism, and the temperature and pressure of the separation tower are controlled by a control device to separate the crude hydrogen chloride gas. The preset temperature of the separation tower is 200°C, and the preset pressure of the separation tower is 2900 Pa.

[0114] In this embodiment, in S3, the crude hydrogen chloride gas is transported to a washing tower by a transport mechanism for washing and impurity removal, and the hydrogen chloride gas is cyclically washed by a circulation mechanism.

[0115] In this embodiment, in S4, the hydrogen chloride gas after washing and impurity removal is transported to a falling film absorber by a transport mechanism for absorption reaction to generate high-purity hydrochloric acid. The falling film absorber is provided with three stages and is connected in series in sequence.

[0116] In this embodiment, in S5, the obtained high-concentration hydrochloric acid is transported to the adsorption bed by a circulation pump, and the high-concentration hydrochloric acid is circulated and transported by a circulation mechanism. A monitoring device is arranged on the circulation mechanism, and the monitoring device is used to monitor impurities in the high-concentration hydrochloric acid.

[0117] In this embodiment, in S6, a sampling mechanism is used to sample the produced high-concentration hydrochloric acid finished product, and the obtained sample is transported to an analyzer by a transport mechanism. The analyzer can analyze the high-purity hydrochloric acid, and the qualified concentration threshold of the high-purity hydrochloric acid is 11.33 - 12.02 mol / L.

[0118] In this embodiment, in S6, a cleaning mechanism and a timing control mechanism are arranged on the analyzer. The cleaning mechanism is used to clean the analyzer, and the timing control mechanism is used to start the cleaning mechanism at a fixed time.

[0119] In this embodiment, in S7, the qualified high-concentration hydrochloric acid is filled and packaged by a filling mechanism, and the packaged high-purity hydrochloric acid is transported and stored by a transport and storage device.

[0120] Test Example

[0121] By the preparation schemes for producing high-purity hydrochloric acid proposed in Examples 1 to 5, compared with the conventional preparation schemes for producing high-purity hydrochloric acid, the experimental data are as shown in the following table:

[0122] Example 1 Example 2 Example 3 Example 4 Example 5 Improvement in production quality Improvement in production quality Improvement in production quality Improvement in production quality Improvement in production quality 5% 12% 18% 24% 30%

[0123] As mentioned above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. A preparation method of high-purity hydrochloric acid from by-product HCl of dichlorofluoromethane, characterized in that: It includes the following steps: S1: Collect the organic mixture obtained in the production of chlorodifluoromethane and conduct condensation filtration; S2: Conduct preliminary separation on the condensed and filtered organic mixture to obtain crude hydrogen chloride; S3: Wash and remove impurities from the crude hydrogen chloride; S4: Conduct an absorption reaction on the washed hydrogen chloride to obtain high-purity hydrochloric acid; S5: Conduct cyclic adsorption on the high-purity hydrochloric acid; S6: Take a sample and analyze the high-purity hydrochloric acid after cyclic adsorption treatment; S7: Package and store the qualified high-purity hydrochloric acid.

2. The preparation method of high-purity hydrochloric acid produced from by-product HCL of dichlorofluoromethane according to claim 1, characterized in that: In S1, the organic mixture obtained in the production of chlorodifluoromethane is collected by a collection mechanism, and the collected organic mixture is transported to a condenser by a transport mechanism for condensation.

3. The preparation method of high-purity hydrochloric acid produced from by-product HCL of dichlorofluoromethane according to claim 2, characterized in that: In S1, the condensed gas-liquid mixture is transported to a gas-liquid separator by a transport mechanism for treatment, and hydrogen chloride gas is filtered and adsorbed by an activated carbon adsorption layer.

4. The preparation method of high-purity hydrochloric acid produced from by-product HCl of difluoromonochloromethane according to claim 3, characterized in that: In S2, the condensed liquid is refluxed into the separation tower by a reflux mechanism, and the temperature and pressure of the separation tower are controlled by a control device to separate crude hydrogen chloride gas.

5. The preparation method of high-purity hydrochloric acid produced from by-product HCL of dichlorofluoromethane according to claim 4, characterized in that: In S3, the crude hydrogen chloride gas is transported to a washing tower by a transport mechanism for washing and impurity removal, and the hydrogen chloride gas is cyclically washed by a circulation mechanism.

6. The preparation method of high-purity hydrochloric acid produced from by-product HCL of dichlorofluoromethane according to claim 5, characterized in that: In S4, the hydrogen chloride gas after washing and impurity removal is transported to a falling film absorber by a transport mechanism for an absorption reaction to generate high-purity hydrochloric acid. The falling film absorber has three stages and is connected in series in sequence.

7. The preparation method of high-purity hydrochloric acid produced from by-product HCl of dichlorofluoromethane according to claim 6, characterized in that: In S5, the obtained high-purity hydrochloric acid is transported to an adsorption bed by a circulation pump, and the high-purity hydrochloric acid is cyclically transported by a circulation mechanism. A monitoring device is provided on the circulation mechanism, and the monitoring device is used to monitor impurities in the high-purity hydrochloric acid.

8. A preparation method of high-purity hydrochloric acid produced from by-product HCl of dichlorofluoromethane, according to claim 7, characterized in that: In S6, a sample of the generated high-purity hydrochloric acid finished product is taken by a sampling mechanism, and the obtained sample is transported to an analyzer by a transport mechanism. The high-purity hydrochloric acid can be analyzed by the analyzer.

9. The preparation method of high-purity hydrochloric acid produced from by-product HCL of dichlorofluoromethane according to claim 8, characterized in that: In S6, a cleaning mechanism and a timing control mechanism are provided on the analyzer. The cleaning mechanism is used to clean the analyzer, and the timing control mechanism is used to start the cleaning mechanism at a fixed time.

10. A preparation method of high-purity hydrochloric acid produced from by-product HCL of dichlorofluoromethane, according to claim 9, characterized in that: In S7, the qualified high-purity hydrochloric acid is filled and packaged by a filling mechanism, and the packaged high-purity hydrochloric acid is transported and stored by a transport and storage device.

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