Issues with online detection of hydrogen chloride and free chlorine
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For a long time, the detection of hydrogen chloride purity and free chlorine has relied on manual sampling, a method that cannot provide guidance for production. On the premise of ensuring production safety, there is often considerable leeway in controlling the purity of hydrogen chloride in order to avoid the presence of free chlorine. If the problems associated with online monitoring are resolved, it will be possible to **increase the purity of hydrogen chloride, and to achieve an actual automatic proportioning process for acetylene and hydrogen chloride. A few years ago, our factory also used such an online detector, but its performance was very poor, so it couldn’t be relied on as a basis for control. Last year, Henan Shenma was featured in the journal \"Chlor-Alkali Industry,\" and it is said that the product performed well. What are your thoughts?
Risks and benefits coexist; both are part of moving forward, no problem.
Our unit is also using online monitors at the moment, but the monitoring results are unstable; the data sometimes turn out to be too high or too low. Therefore, we cannot rely entirely on these instruments.
The main difficulty in the online analysis of hydrogen chloride lies in the hydrogen chloride gas components or impurities. The primary reason why online analyzers cannot operate stably over a long period is related to the pre-treatment of the working gas; inadequate treatment of chlorine and hydrogen results in high levels of moisture and solid particles in the resulting hydrogen chloride gas. This can lead to issues such as blockages in the sampling pipes of the online analyzer, accumulation of liquid, excessive differential pressure in the filters, and other abnormalities that affect the proper functioning of the analyzer. By improving the quality of chlorine and hydrogen treatment as well as sample gas pretreatment, it is possible to stabilize and extend the performance and lifespan of online analyzers.
It is recommended to carry them out simultaneously; understand the monitoring conditions first, and only then trust online testing if the conditions permit
This post was last edited by wang*neng on 2009-6-16 at 16:23. Perhaps the current online instrument technology is not yet mature enough, resulting in easy damage or frequent inaccurate measurements. In my opinion, the presence of free chlorine in hydrogen chloride indicates that the produced hydrogen chloride product is of poor quality. To address this issue, it may be necessary to focus on the step of hydrogen chloride synthesis; by stabilizing the pressures of hydrogen and chlorine, automated control can be employed during hydrogen chloride synthesis, with pressure regulators used to maintain stable levels for both gases. Additionally, using a larger buffer tank for the hydrogen chloride gas could prove to be a safer and more effective solution than relying on instruments for detecting free chlorine. Monitoring instruments merely serve to carry out monitoring; by detecting issues in a timely manner, they ensure safety in subsequent processes, but they can also affect the continuity of production.
I hope experts will conduct further research so that stable and accurate online monitors can be put into use as soon as possible