Bromine oxidation process automatic analysis control system and control method thereof

Abstract

An automatic analysis and control system for bromine oxidation process at least comprises a controller, a sampling part and a control circuit, the control system is used for automatically adjusting the chlorine matching rate in oxidation brine in the bromine oxidation process and / or automatically adjusting the pH value in the oxidation brine in the bromine oxidation process. According to the invention, brine related parameters can be rapidly detected in real time, production parameters can be accurately obtained, and accurate production regulation and control can be automatically carried out according to the production parameters.

Description

technical field

[0001] The invention relates to an automatic analysis control system and a control method of a bromine oxidation process, belonging to the technical field of bromine production. Background technique

[0002] The current bromine production process generally adopts chlorine gas oxidation under acidic conditions, air is blown out, sulfur dioxide is absorbed to obtain mother liquor, and then the product is distilled out by chlorine gas secondary oxidation steam. Among them, the bromine production principles involved have been disclosed. For example, the relevant technical content comes from the article "Summary of Bromine Production Process" published by Wang Fa in the journal "Science Observation".

[0003] Traditional bromine oxidation process control requires regular testing of pH and chlorine ratio. The method of testing the pH of the formulation is: the laboratory personnel regularly go to the designated place to take samples, bring the samples to the labor...

Examples

Embodiment 1

[0058] The bromine oxidation process automatic analysis control system of the present invention is installed on the oxidation brine pipeline, as attached figure 1 Shown:

[0059] The sampling part in the automatic analysis and control system of the bromine oxidation process is installed at the oxidation brine pipeline for sampling. In order to ensure the accuracy of the test results, the sampling port is at the end of the oxidation brine pipeline, before entering the blowing tower. The control circuit instructs the nitrogen regulating valve and / or the sulfuric acid regulating valve to inject gas and / or liquid into the oxidized brine pipeline according to the instructions of the controller.

[0060] Wherein, the control system includes at least:

[0061] Controller, sampling unit and control circuit;

[0062] The control system is used for automatically adjusting the chlorine distribution rate in the oxidation brine in the bromine oxidation process, and / or for automatically a...

Embodiment 2

[0076] The control method of the control system described in the above embodiment 1, the control system is used to automatically adjust the chlorine distribution rate in the oxidized brine in the bromine oxidation process: the chlorine distribution rate is controlled between 105-115 by the control system .

[0077] The determination method of chlorine distribution rate is as follows:

[0078] Principle: The chlorine distribution rate is obtained by calculating the total amount of free bromine and free chlorine (calculated as bromine) in the oxidized brine measured by iodometric method and the bromide ion content in the raw brine.

[0079] Determination steps: draw 25mL of oxidized brine into 10mL of 30% KI solution (or directly add 0.5gKI) into a 250mL Erlenmeyer flask, add 3mL of 6mol / 1HCl (the solution is weakly acidic, without adding HCl), immediately use Titrate with 0.1mol / L sodium thiosulfate standard solution, using starch as indicator until white.

[0080] Calculatio...

Embodiment 3

[0095] In the control method of the control system described in Example 1 above, the pH value in the oxidation brine is controlled between 3-3.5.

[0096] like image 3 Shown, the concrete steps of described adjustment pH value are as follows:

[0097] 1) start, and detect pH;

[0098] 2) When the detection pH is greater than or equal to 3 and less than 3.2, control the opening of the sulfuric acid regulating valve to reduce by 0.1%; when the detection pH is greater than or equal to 3.2 and less than or equal to 3.3, do not adjust the sulfuric acid regulating valve; When equal to 3.5, control the opening of the sulfuric acid regulating valve to increase by 0.1%;

[0099] 3) Continue to monitor the pH;

[0100] 4) When the detected pH is greater than or equal to 3 and less than 3.2: compare with the last valve opening result: when greater than or equal to the last valve opening result, control the opening of the sulfuric acid regulating valve to decrease by 0.1%; compare wit...

technical field

[0001] The invention relates to an automatic analysis control system and a control method of a bromine oxidation process, belonging to the technical field of bromine production. Background technique

[0002] The current bromine production process generally adopts chlorine gas oxidation under acidic conditions, air is blown out, sulfur dioxide is absorbed to obtain mother liquor, and then the product is distilled out by chlorine gas secondary oxidation steam. Among them, the bromine production principles involved have been disclosed. For example, the relevant technical content comes from the article "Summary of Bromine Production Process" published by Wang Fa in the journal "Science Observation".

[0003] Traditional bromine oxidation process control requires regular testing of pH and chlorine ratio. The method of testing the pH of the formulation is: the laboratory personnel regularly go to the designated place to take samples, bring the samples to the labor...

Examples

Embodiment 1

[0058] The bromine oxidation process automatic analysis control system of the present invention is installed on the oxidation brine pipeline, as attached figure 1 Shown:

[0059] The sampling part in the automatic analysis and control system of the bromine oxidation process is installed at the oxidation brine pipeline for sampling. In order to ensure the accuracy of the test results, the sampling port is at the end of the oxidation brine pipeline, before entering the blowing tower. The control circuit instructs the nitrogen regulating valve and / or the sulfuric acid regulating valve to inject gas and / or liquid into the oxidized brine pipeline according to the instructions of the controller.

[0060] Wherein, the control system includes at least:

[0061] Controller, sampling unit and control circuit;

[0062] The control system is used for automatically adjusting the chlorine distribution rate in the oxidation brine in the bromine oxidation process, and / or for automatically a...

Embodiment 2

[0076] The control method of the control system described in the above embodiment 1, the control system is used to automatically adjust the chlorine distribution rate in the oxidized brine in the bromine oxidation process: the chlorine distribution rate is controlled between 105-115 by the control system .

[0077] The determination method of chlorine distribution rate is as follows:

[0078] Principle: The chlorine distribution rate is obtained by calculating the total amount of free bromine and free chlorine (calculated as bromine) in the oxidized brine measured by iodometric method and the bromide ion content in the raw brine.

[0079] Determination steps: draw 25mL of oxidized brine into 10mL of 30% KI solution (or directly add 0.5gKI) into a 250mL Erlenmeyer flask, add 3mL of 6mol / 1HCl (the solution is weakly acidic, without adding HCl), immediately use Titrate with 0.1mol / L sodium thiosulfate standard solution, using starch as indicator until white.

[0080] Calculatio...

Embodiment 3

[0095] In the control method of the control system described in Example 1 above, the pH value in the oxidation brine is controlled between 3-3.5.

[0096] like image 3 Shown, the concrete steps of described adjustment pH value are as follows:

[0097] 1) start, and detect pH;

[0098] 2) When the detection pH is greater than or equal to 3 and less than 3.2, control the opening of the sulfuric acid regulating valve to reduce by 0.1%; when the detection pH is greater than or equal to 3.2 and less than or equal to 3.3, do not adjust the sulfuric acid regulating valve; When equal to 3.5, control the opening of the sulfuric acid regulating valve to increase by 0.1%;

[0099] 3) Continue to monitor the pH;

[0100] 4) When the detected pH is greater than or equal to 3 and less than 3.2: compare with the last valve opening result: when greater than or equal to the last valve opening result, control the opening of the sulfuric acid regulating valve to decrease by 0.1%; compare wit...

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