Online detection of sulfate ions in saturated sodium chloride saline solution
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In chlor-alkali production, it is often necessary to measure the sulfate ions in brine, with concentrations ranging from 5–9 g/L. Denitration processes also require monitoring of sulfate levels, which range from 30–1009 g/L. All current analysis methods are manual, time-consuming, and not very accurate. Are there any online detectors or analyzers available for measuring sulfate ions in chlor-alkali saturated brine?
I’ve looked up some information – is it possible to use ICP to measure total sulfur in order to detect sulfate ions? Although ICP does not give very strong responses to sulfur and phosphorus, the concentration of sulfate ions in saline solutions is 9 g/L, which is much higher than the PPm or PPb levels of other metal ions. What do you think – is this approach feasible?
This post was last edited by qugd on 2020-1-4 at 21:53. Have you considered the concentration of sodium chloride in the saline solution? It’s nearly 30% concentrated sodium chloride, and sampling, sample processing, and sample transfer all present challenges. It is not feasible, in my opinion, to make ICP online and capable of handling such harsh sample conditions. For such samples, if online analysis is used, I believe that firstly it ensures the representativeness of the samples, and secondly it takes into account the reliability and feasibility of the analysis method. In addition, specific requirements for the analysis methods must also be specified, that is, what level of analysis performance is to be achieved, including analysis accuracy, frequency of analysis, requirements for sample processing, and safety requirements for the instruments. For sulfate in samples of this high-concentration saline matrix, titration or colorimetry can be considered for online analysis
Has anyone used a rapid analyzer for determining the sulfuric acid content in chromium-plating solutions? It can be used for analyzing sulfate concentrations below 5 g/L. The principle involves adding hydrochloric acid and barium chloride to form barium sulfate precipitate, which is then separated using a centrifuge; the amount of sulfate is determined based on the volume of this barium sulfate precipitate. Can it be used for analyzing sodium sulfate in chlor-alkali process brines?
Then you’ll have to make an effort to find a high-speed centrifuge that can operate continuously online, along with equipment for online separation of the precipitates
There shouldn’t be one for this; it’s not necessary to be online. The goal is simply to shorten the time required for prototyping while maintaining accuracy, as costs also need to be taken into consideration.
Is it necessary for this testing environment to be explosion-proof?
But in your initial post, you said you were asking for an online analysis.
Used in the chlor-alkali brine process; explosion protection is not required
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