Seeking a complete set of analytical instruments for chlor-alkali plants (heavy reward offered)

1. Analysis of calcium and magnesium ions in brine – Instrument type: online analysis. Analysis methods: titration method, spectrophotometric method. The titration method is suitable for determining the concentration of hardness ions in brine, while the spectrophotometric method is more appropriate; however, attention must be paid to the effect of free chlorine in dechlorinated brine on the color-developing agents. 2. Analysis of calcium and magnesium ions in secondary brine: Instrument type: Online analysis. Analysis methods: Titration, spectrophotometry. Titration is no longer effective for detecting calcium and magnesium ions in secondary brine, and colorimetry may also be affected by high salt concentrations in terms of sensitivity and repeatability; however, detection is still possible. Such analyzers do exist, but their performance varies. 3. Analysis of free chlorine in fresh brine: Instrument type: Online analysis. Analysis method: Spectrophotometry. Spectrophotometry is not recommended for detecting free chlorine due to the challenges posed by high salt concentrations. Detection can be carried out by combining it with ORP values, or by using analyzers designed for high salt concentrations, or analyzers that are compatible with seawater and have a higher measurement range. 4. Analysis of COD in fresh brine: Instrument type: Online analysis. Analysis methods: Spectrophotometry, colorimetry. Detecting COD is highly discouraged due to the significant influence of salts, which can also cause blockages in the sample pipelines. What is the purpose of testing COD? 5. Analysis of excess alkali in saline solutions. Instrument type: Online analysis. Analysis methods: Spectrophotometry, titration. The amount of excess alkali can be determined by pH measurement, or through online titration; spectrophotometry is not suitable because in actual operating conditions the salt concentration is very high, and the alkali may exist as part of a buffer system, which limits the accuracy of photometric methods. Titration is suitable, but online titration analyzers are relatively complex, and their maintenance costs and operational expenses are also high. 6. TOC analysis in saline solution: Instrument type: Online analysis. Analysis method: High-temperature combustion method. The high-temperature combustion method is not suitable, as the presence of large amounts of salt can affect sampling, combustion, and the catalysts used for conversion, thereby creating limitations for this method. A new type of wet digestion method can be used for samples. 1. Analysis of water content in chlorine gas before and after the chlorine compressor. Instrument type: online analysis or sampling analysis. Analysis method: phosphorus pentoxide. The laser method is recommended; the electrolytic method using phosphorus pentoxide is slow and requires a long equilibration time, making it unsuitable for this application. 2. Analysis of oxygen content in hydrogen: Instrument type: Online analysis or sampling analysis; Analysis method: Electrochemical. 3. Analysis of water content in hydrogen: Instrument type: Online analysis or sampling analysis; Analysis method: Electrochemical; Capacitometric methods or other specialized methods for analyzing trace amounts of water can also be used. 4. Hydrogen purity analysis: Instrument type: Online analysis or sampling analysis; Analysis method: Chromatography

You can inquire about “Jiangsu Yimai Technology”; our company has conducted research on their firm. Their company specializes in producing online analytical instruments for the chlor-alkali industry.

This post was last edited by qugd on 2015-9-14 at 22:30. In the process of producing caustic soda using ion exchange membranes, the following types of analyzers are also used: 1. Turbidity meter for saline solutions; it generally has a low measurement range and is used to check sedimentation and filtration effects. Conventional turbidity meters cannot handle saline solutions at all. 2. ORP analyzer, used to detect free chlorine and the effectiveness of sodium hypochlorite added during production. 3. Inductive conductivity analyzer, utilized to measure the concentration of saline solutions, caustic soda, sulfuric acid used for drying chlorine gas, and hydrochloric acid. 4. During the production of sodium hypochlorite, conductivity and ORP analyzers are used to monitor the production process and reaction progress. 5. Data acquisition system for electrolyzer voltage and current, including data on electrolyzer temperature; typically, around 100–300 channels, or even more, are used for data collection. 6. Concentration meter for finished caustic soda, which usually employs the density method; the sample detector in such devices must be made of nickel. 7. Detection of free chlorine in the saline solution exiting the electrolyzer; the measurement range for free chlorine in this case can be as high as hundreds or even thousands of ppm. 8. Monitoring of sodium carbonate concentration, achieved using an inductive conductivity analyzer

Add 3 more items: 1. Detection and alarm for chlorine and hydrogen leaks in the electrolysis workshop, as well as detection and alarm for chlorine leaks in the chlorine compression workshop. 2. Monitoring of leaks in the heat exchangers of the chlorine compression workshop; this is done by detecting free chlorine in the chilled brine, either using ORP or by measuring free chlorine levels. 3. Detection of ammonia nitrogen in the primary brine, which is necessary to prevent the formation of explosive nitric trichloride in the presence of chlorine. All three of these detections are related to safe production

Do you have that document? Could I share it for you to take a look? Thank you.

Bro Hua Xian, please take a look at this material – it’s a report I presented at a professional conference earlier: http://wenku.baidu.com/link?url=WPdWb0Y3p7NmcGKJSb9YFlWTNHCKoQSi15Br_yj699jEzRGmc6P4vsdEWjAhhqauZr1Jp8M6PyrODny7oIn7--jLpCPHJ86YAayZPcFQpSG. If you have any other questions, feel free to contact me promptly.

Senior Qu, the document is excellent and highly needed. The manager of a chlor-alkali plant has asked me to develop a plan for an integrated analyzer – a set of instruments that can handle everything from water quality analysis to product analysis. It would be ideal if it were possible to replace manual sampling and analysis in the laboratory with online, real-time analysis; for example, for the analysis of calcium and magnesium levels in saline solutions, which is still mainly done manually in most chlor-alkali plants. Recently, safety inspections in chemical plants have also become very strict, so I was asked to develop this plan; in conjunction with the instruments, all those that need to be replaced will be replaced. I would like to ask if all the instrument products mentioned in the text belong to your company? Hash products are extremely expensive; ordinary companies can’t afford them, hehe. . The information in your report file is very detailed; it’s top-notch for online dashboards, and it’s exactly what I need. I’ll organize it accordingly. Thank you. Additionally, I might need a product application example for analytical instruments, so I will select two best answers – and without a doubt you are one of them. Thank you, Mr. Qu.

Originally, there were not many online analysis instruments for ion exchange membrane units imported from Japan; the main ones included PH/ORP/chlorine content, alkalinity (density meter), and detection of flammable gases and toxic gases. The rest are done through testing

If you need any information, feel free to leave me a message

I need some laboratory analysis tests. I already have those you mentioned. At present, the chlor-alkali plant wants to convert most of these laboratory analysis tests into online monitoring, but it’s not clear which ones can be done in this way; I would appreciate some guidance on this.