Analysis of indicators for petrochemical circulating water
Thread Content
Dear teachers, I would like to ask what methods are used to determine total hardness, calcium hardness, total alkalinity, chloride ions, and phosphorus content in the circulating water used in the petrochemical industry. Thank you? Does the methyl orange alkalinity specified in national standards refer to total alkalinity? Thank you! ! ! ! ! !
Total hardness is the sum of the hardnesses contributed by calcium and magnesium ions, and can be determined by titration or colorimetry. Calcium hardness is a parameter that describes only the measured calcium content; by controlling the titration or colorimetry conditions, it is possible to measure only calcium ions without measuring magnesium ions. Total alkalinity refers to all substances that can react with standard acids under certain conditions; it is generally determined by titration, with the endpoint of the titration being determined using methyl orange or methyl red. Chloride ions can be titrated using a standard silver ion solution when present in high concentrations, that is, the Mohr method ； For low concentrations, the ion-selective electrode method or ion chromatography can be used. Phosphorus content is divided into total phosphorus and phosphate; total phosphorus is determined by colorimetry after the sample is digested, and the result is converted into phosphorus or phosphorus pentoxide ； Phosphate, on the other hand, is determined colorimetrically directly, expressed as phosphorus pentoxide or phosphate. Methyl orange alkalinity is the total alkalinity.
Calcium, magnesium, chlorine, and phosphorus in circulating water can be detected using ICP instruments, which is very efficient. Available chlorine can generally be measured conveniently using a HACH DR2800 with DPD. What is currently known regarding alkalinity is that it is based on methyl orange alkalinity, with a pH of 4.5 representing the total alkalinity; there is also phenolphthalein alkalinity with a pH of 8.3. If your company’s CW pH value is not high, this can be ignored.
Total hardness (GBT-6909), calcium hardness (GBT 15452), total alkalinity (GBT-1545), chloride ions (GBT-15453), phosphorus content (GBT11893) – you’ll need to look them up on your own; I don’t have the electronic versions
If it exceeds the limit, you can turn to me; I specialize in physical descaling and rust removal, as well as reducing hardness, conductivity, and preventing bacterial and algal growth
Yes, by using high frequency and variable frequency, water molecules are broken down into neutral small molecules to form reduced water. If needed, you can leave your contact information to find out more
This device can remove scale (calcium ions, magnesium ions, iron ions), prevent rust, kill bacteria and algae, reduce COD, and convert chloride ions in water into free chlorine molecules