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On-line detection method of free chlorine during synthesis process of hydrogen chloride

A technology of synthesis process and detection method, applied in chlorine/hydrogen chloride and other directions, to achieve the effects of stable production, lightening work intensity and ensuring detection sensitivity

Inactive Publication Date: 2010-03-24
昊华宇航化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned deficiencies in the existing method for detecting free chlorine in hydrogen chloride, and provide an online detection method for free chlorine in the hydrogen chloride synthesis process that is easy to operate, high in sensitivity, and conducive to stable production

Method used

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  • On-line detection method of free chlorine during synthesis process of hydrogen chloride

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Effect test

Embodiment 1

[0016] Free chlorine online detection method in the hydrogen chloride synthesis process of the present invention is as follows:

[0017] (1) As shown in Figure 1, chlorine and hydrogen are fully combusted in the hydrogen chloride synthesis furnace, and the hydrogen chloride drawn from the hydrogen chloride main pipe first passes through the three-way valve, and then enters the absorber through flowmeter metering and control of a flow rate of 150L / h; pure water The flow rate is controlled by a flowmeter to 1000L / h (determined according to the volume of the absorber) and then enters the absorber, where a dilute hydrochloric acid solution with a mass concentration of 0.1% is made; the gas tail gas passing through the absorber is injected into the waste gas recovery system for recycling.

[0018] (2) The overflow of the dilute hydrochloric acid solution in the absorber is detected by the ORP meter, and the detected dilute acid solution is injected into the recovery system to recycl...

Embodiment 2

[0021] Free chlorine online detection method in the hydrogen chloride synthesis process of the present invention is as follows:

[0022] (1) As shown in Figure 1, chlorine and hydrogen are fully combusted in the hydrogen chloride synthesis furnace, and the hydrogen chloride drawn from the hydrogen chloride main pipe first passes through the three-way valve, and then enters the absorber through flowmeter metering and control of a flow rate of 1500L / h; pure water The flow rate is controlled by a flowmeter to 300L / h (determined according to the volume of the absorber) and then enters the absorber, where a dilute hydrochloric acid solution with a mass concentration of 5% is made; the gas tail gas passing through the absorber is injected into the waste gas recovery system for recovery.

[0023] (2) The overflow of the dilute hydrochloric acid solution in the absorber is detected by the ORP meter, and the detected dilute acid solution is injected into the recovery system to be recycl...

Embodiment 3

[0026] Free chlorine online detection method in the hydrogen chloride synthesis process of the present invention is as follows:

[0027] (1) As shown in Figure 1, chlorine and hydrogen are fully combusted in the hydrogen chloride synthesis furnace, and the hydrogen chloride drawn from the hydrogen chloride main pipe first passes through the three-way valve, and then enters the absorber through flowmeter metering and control of a flow rate of 1000L / h; pure water The flow rate is controlled by a flowmeter to 200L / h (determined according to the volume of the absorber) and then enters the absorber, where a dilute hydrochloric acid solution with a mass concentration of 10% is made; the gas tail gas passing through the absorber is injected into the waste gas recovery system for recycling.

[0028] (2) The overflow of the dilute hydrochloric acid solution in the absorber is detected by the ORP meter, and the dilute acid solution after detection is injected into the recovery system to ...

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Abstract

The invention relates to an on-line detection method of free chlorine during the synthesis process of hydrogen chloride, which comprises the following steps: (1) leading the hydrogen chloride which isled out of a main pipe of the hydrogen chloride to sequentially pass thorough a three-way valve and a flowmeter for metering, then leading the hydrogen chloride to enter into an absorber, leading pure water to enter into the absorber after passing through the flowmeter, and preparing dilute hydrochloric acid solution with the weight concentration of 0.1-10% in the absorber; (2) overflowing the dilute hydrochloric acid solution in the absorber for passing through an ORP meter for carrying out detection, wherein, the free chlorine in hydrogen chloride gas leads the ORP value to change; and (3)transferring information of the changed ORP value to a DCS control center, when the ORP value is not less than 500mv, the DSC control center can automatically regulate an automatic valve of chlorine or hydrogen according to the mix ratio difference of the chlorine or the hydrogen which enters into a furnace and reduce the flow rate of the chlorine or increase the flow rate of the hydrogen. The method reduces the work intensity, ensures the detection sensitivity and is conductive to stable production.

Description

technical field [0001] The invention relates to a method for measuring chlorine content in tail gas, in particular to an online detection method for free chlorine in the hydrogen chloride synthesis process. Background technique [0002] Hydrogen and chlorine are combusted in the synthesis furnace to generate hydrogen chloride. If the ratio of chlorine and hydrogen is not adjusted properly, hydrogen chloride will contain incompletely combusted chlorine. When hydrogen chloride with incompletely combusted chlorine is sent to the polyvinyl chloride process, the concentration of chlorine When it exceeds a certain value, the excess free chlorine can react violently with acetylene, releasing a large amount of heat, causing combustion, explosion and other vicious accidents, which not only damage pipelines and equipment, but also pose a great threat to safe production. [0003] At present, there are two common methods for detecting free chlorine in hydrogen chloride in the industry: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/01
Inventor 郭金星王松波王琦赵红涛张小林吕有霞王跃兰闫振国
Owner 昊华宇航化工有限责任公司
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